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 "1.3.2" 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 /* This driver also supports the ATEN UC2324 device since it is mos7840 based 127 * - if I knew the device id it would also support the ATEN UC2322 */ 128 #define USB_VENDOR_ID_ATENINTL 0x0557 129 #define ATENINTL_DEVICE_ID_UC2324 0x2011 130 131 /* Interrupt Routine Defines */ 132 133 #define SERIAL_IIR_RLS 0x06 134 #define SERIAL_IIR_MS 0x00 135 136 /* 137 * Emulation of the bit mask on the LINE STATUS REGISTER. 138 */ 139 #define SERIAL_LSR_DR 0x0001 140 #define SERIAL_LSR_OE 0x0002 141 #define SERIAL_LSR_PE 0x0004 142 #define SERIAL_LSR_FE 0x0008 143 #define SERIAL_LSR_BI 0x0010 144 145 #define MOS_MSR_DELTA_CTS 0x10 146 #define MOS_MSR_DELTA_DSR 0x20 147 #define MOS_MSR_DELTA_RI 0x40 148 #define MOS_MSR_DELTA_CD 0x80 149 150 /* Serial Port register Address */ 151 #define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01)) 152 #define FIFO_CONTROL_REGISTER ((__u16)(0x02)) 153 #define LINE_CONTROL_REGISTER ((__u16)(0x03)) 154 #define MODEM_CONTROL_REGISTER ((__u16)(0x04)) 155 #define LINE_STATUS_REGISTER ((__u16)(0x05)) 156 #define MODEM_STATUS_REGISTER ((__u16)(0x06)) 157 #define SCRATCH_PAD_REGISTER ((__u16)(0x07)) 158 #define DIVISOR_LATCH_LSB ((__u16)(0x00)) 159 #define DIVISOR_LATCH_MSB ((__u16)(0x01)) 160 161 #define CLK_MULTI_REGISTER ((__u16)(0x02)) 162 #define CLK_START_VALUE_REGISTER ((__u16)(0x03)) 163 164 #define SERIAL_LCR_DLAB ((__u16)(0x0080)) 165 166 /* 167 * URB POOL related defines 168 */ 169 #define NUM_URBS 16 /* URB Count */ 170 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */ 171 172 173 static struct usb_device_id moschip_port_id_table[] = { 174 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)}, 175 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)}, 176 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)}, 177 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)}, 178 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)}, 179 {} /* terminating entry */ 180 }; 181 182 static __devinitdata struct usb_device_id moschip_id_table_combined[] = { 183 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)}, 184 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)}, 185 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)}, 186 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)}, 187 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)}, 188 {} /* terminating entry */ 189 }; 190 191 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined); 192 193 /* This structure holds all of the local port information */ 194 195 struct moschip_port { 196 int port_num; /*Actual port number in the device(1,2,etc) */ 197 struct urb *write_urb; /* write URB for this port */ 198 struct urb *read_urb; /* read URB for this port */ 199 struct urb *int_urb; 200 __u8 shadowLCR; /* last LCR value received */ 201 __u8 shadowMCR; /* last MCR value received */ 202 char open; 203 char open_ports; 204 char zombie; 205 wait_queue_head_t wait_chase; /* for handling sleeping while waiting for chase to finish */ 206 wait_queue_head_t delta_msr_wait; /* for handling sleeping while waiting for msr change to happen */ 207 int delta_msr_cond; 208 struct async_icount icount; 209 struct usb_serial_port *port; /* loop back to the owner of this object */ 210 211 /* Offsets */ 212 __u8 SpRegOffset; 213 __u8 ControlRegOffset; 214 __u8 DcrRegOffset; 215 /* for processing control URBS in interrupt context */ 216 struct urb *control_urb; 217 struct usb_ctrlrequest *dr; 218 char *ctrl_buf; 219 int MsrLsr; 220 221 spinlock_t pool_lock; 222 struct urb *write_urb_pool[NUM_URBS]; 223 char busy[NUM_URBS]; 224 bool read_urb_busy; 225 }; 226 227 228 static int debug; 229 230 /* 231 * mos7840_set_reg_sync 232 * To set the Control register by calling usb_fill_control_urb function 233 * by passing usb_sndctrlpipe function as parameter. 234 */ 235 236 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg, 237 __u16 val) 238 { 239 struct usb_device *dev = port->serial->dev; 240 val = val & 0x00ff; 241 dbg("mos7840_set_reg_sync offset is %x, value %x\n", reg, val); 242 243 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, 244 MCS_WR_RTYPE, val, reg, NULL, 0, 245 MOS_WDR_TIMEOUT); 246 } 247 248 /* 249 * mos7840_get_reg_sync 250 * To set the Uart register by calling usb_fill_control_urb function by 251 * passing usb_rcvctrlpipe function as parameter. 252 */ 253 254 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg, 255 __u16 *val) 256 { 257 struct usb_device *dev = port->serial->dev; 258 int ret = 0; 259 260 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ, 261 MCS_RD_RTYPE, 0, reg, val, VENDOR_READ_LENGTH, 262 MOS_WDR_TIMEOUT); 263 dbg("mos7840_get_reg_sync offset is %x, return val %x\n", reg, *val); 264 *val = (*val) & 0x00ff; 265 return ret; 266 } 267 268 /* 269 * mos7840_set_uart_reg 270 * To set the Uart register by calling usb_fill_control_urb function by 271 * passing usb_sndctrlpipe function as parameter. 272 */ 273 274 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg, 275 __u16 val) 276 { 277 278 struct usb_device *dev = port->serial->dev; 279 val = val & 0x00ff; 280 /* For the UART control registers, the application number need 281 to be Or'ed */ 282 if (port->serial->num_ports == 4) { 283 val |= (((__u16) port->number - 284 (__u16) (port->serial->minor)) + 1) << 8; 285 dbg("mos7840_set_uart_reg application number is %x\n", val); 286 } else { 287 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) { 288 val |= (((__u16) port->number - 289 (__u16) (port->serial->minor)) + 1) << 8; 290 dbg("mos7840_set_uart_reg application number is %x\n", 291 val); 292 } else { 293 val |= 294 (((__u16) port->number - 295 (__u16) (port->serial->minor)) + 2) << 8; 296 dbg("mos7840_set_uart_reg application number is %x\n", 297 val); 298 } 299 } 300 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, 301 MCS_WR_RTYPE, val, reg, NULL, 0, 302 MOS_WDR_TIMEOUT); 303 304 } 305 306 /* 307 * mos7840_get_uart_reg 308 * To set the Control register by calling usb_fill_control_urb function 309 * by passing usb_rcvctrlpipe function as parameter. 310 */ 311 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg, 312 __u16 *val) 313 { 314 struct usb_device *dev = port->serial->dev; 315 int ret = 0; 316 __u16 Wval; 317 318 /* dbg("application number is %4x \n", 319 (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */ 320 /* Wval is same as application number */ 321 if (port->serial->num_ports == 4) { 322 Wval = 323 (((__u16) port->number - (__u16) (port->serial->minor)) + 324 1) << 8; 325 dbg("mos7840_get_uart_reg application number is %x\n", Wval); 326 } else { 327 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) { 328 Wval = (((__u16) port->number - 329 (__u16) (port->serial->minor)) + 1) << 8; 330 dbg("mos7840_get_uart_reg application number is %x\n", 331 Wval); 332 } else { 333 Wval = (((__u16) port->number - 334 (__u16) (port->serial->minor)) + 2) << 8; 335 dbg("mos7840_get_uart_reg application number is %x\n", 336 Wval); 337 } 338 } 339 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ, 340 MCS_RD_RTYPE, Wval, reg, val, VENDOR_READ_LENGTH, 341 MOS_WDR_TIMEOUT); 342 *val = (*val) & 0x00ff; 343 return ret; 344 } 345 346 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port) 347 { 348 349 dbg("***************************************\n"); 350 dbg("SpRegOffset is %2x\n", mos7840_port->SpRegOffset); 351 dbg("ControlRegOffset is %2x \n", mos7840_port->ControlRegOffset); 352 dbg("DCRRegOffset is %2x \n", mos7840_port->DcrRegOffset); 353 dbg("***************************************\n"); 354 355 } 356 357 /************************************************************************/ 358 /************************************************************************/ 359 /* I N T E R F A C E F U N C T I O N S */ 360 /* I N T E R F A C E F U N C T I O N S */ 361 /************************************************************************/ 362 /************************************************************************/ 363 364 static inline void mos7840_set_port_private(struct usb_serial_port *port, 365 struct moschip_port *data) 366 { 367 usb_set_serial_port_data(port, (void *)data); 368 } 369 370 static inline struct moschip_port *mos7840_get_port_private(struct 371 usb_serial_port 372 *port) 373 { 374 return (struct moschip_port *)usb_get_serial_port_data(port); 375 } 376 377 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr) 378 { 379 struct moschip_port *mos7840_port; 380 struct async_icount *icount; 381 mos7840_port = port; 382 icount = &mos7840_port->icount; 383 if (new_msr & 384 (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI | 385 MOS_MSR_DELTA_CD)) { 386 icount = &mos7840_port->icount; 387 388 /* update input line counters */ 389 if (new_msr & MOS_MSR_DELTA_CTS) { 390 icount->cts++; 391 smp_wmb(); 392 } 393 if (new_msr & MOS_MSR_DELTA_DSR) { 394 icount->dsr++; 395 smp_wmb(); 396 } 397 if (new_msr & MOS_MSR_DELTA_CD) { 398 icount->dcd++; 399 smp_wmb(); 400 } 401 if (new_msr & MOS_MSR_DELTA_RI) { 402 icount->rng++; 403 smp_wmb(); 404 } 405 } 406 } 407 408 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr) 409 { 410 struct async_icount *icount; 411 412 dbg("%s - %02x", __func__, new_lsr); 413 414 if (new_lsr & SERIAL_LSR_BI) { 415 /* 416 * Parity and Framing errors only count if they 417 * occur exclusive of a break being 418 * received. 419 */ 420 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI); 421 } 422 423 /* update input line counters */ 424 icount = &port->icount; 425 if (new_lsr & SERIAL_LSR_BI) { 426 icount->brk++; 427 smp_wmb(); 428 } 429 if (new_lsr & SERIAL_LSR_OE) { 430 icount->overrun++; 431 smp_wmb(); 432 } 433 if (new_lsr & SERIAL_LSR_PE) { 434 icount->parity++; 435 smp_wmb(); 436 } 437 if (new_lsr & SERIAL_LSR_FE) { 438 icount->frame++; 439 smp_wmb(); 440 } 441 } 442 443 /************************************************************************/ 444 /************************************************************************/ 445 /* U S B C A L L B A C K F U N C T I O N S */ 446 /* U S B C A L L B A C K F U N C T I O N S */ 447 /************************************************************************/ 448 /************************************************************************/ 449 450 static void mos7840_control_callback(struct urb *urb) 451 { 452 unsigned char *data; 453 struct moschip_port *mos7840_port; 454 __u8 regval = 0x0; 455 int result = 0; 456 int status = urb->status; 457 458 mos7840_port = urb->context; 459 460 switch (status) { 461 case 0: 462 /* success */ 463 break; 464 case -ECONNRESET: 465 case -ENOENT: 466 case -ESHUTDOWN: 467 /* this urb is terminated, clean up */ 468 dbg("%s - urb shutting down with status: %d", __func__, 469 status); 470 return; 471 default: 472 dbg("%s - nonzero urb status received: %d", __func__, 473 status); 474 goto exit; 475 } 476 477 dbg("%s urb buffer size is %d\n", __func__, urb->actual_length); 478 dbg("%s mos7840_port->MsrLsr is %d port %d\n", __func__, 479 mos7840_port->MsrLsr, mos7840_port->port_num); 480 data = urb->transfer_buffer; 481 regval = (__u8) data[0]; 482 dbg("%s data is %x\n", __func__, regval); 483 if (mos7840_port->MsrLsr == 0) 484 mos7840_handle_new_msr(mos7840_port, regval); 485 else if (mos7840_port->MsrLsr == 1) 486 mos7840_handle_new_lsr(mos7840_port, regval); 487 488 exit: 489 spin_lock(&mos7840_port->pool_lock); 490 if (!mos7840_port->zombie) 491 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC); 492 spin_unlock(&mos7840_port->pool_lock); 493 if (result) { 494 dev_err(&urb->dev->dev, 495 "%s - Error %d submitting interrupt urb\n", 496 __func__, result); 497 } 498 } 499 500 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg, 501 __u16 *val) 502 { 503 struct usb_device *dev = mcs->port->serial->dev; 504 struct usb_ctrlrequest *dr = mcs->dr; 505 unsigned char *buffer = mcs->ctrl_buf; 506 int ret; 507 508 dr->bRequestType = MCS_RD_RTYPE; 509 dr->bRequest = MCS_RDREQ; 510 dr->wValue = cpu_to_le16(Wval); /* 0 */ 511 dr->wIndex = cpu_to_le16(reg); 512 dr->wLength = cpu_to_le16(2); 513 514 usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0), 515 (unsigned char *)dr, buffer, 2, 516 mos7840_control_callback, mcs); 517 mcs->control_urb->transfer_buffer_length = 2; 518 ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC); 519 return ret; 520 } 521 522 /***************************************************************************** 523 * mos7840_interrupt_callback 524 * this is the callback function for when we have received data on the 525 * interrupt endpoint. 526 *****************************************************************************/ 527 528 static void mos7840_interrupt_callback(struct urb *urb) 529 { 530 int result; 531 int length; 532 struct moschip_port *mos7840_port; 533 struct usb_serial *serial; 534 __u16 Data; 535 unsigned char *data; 536 __u8 sp[5], st; 537 int i, rv = 0; 538 __u16 wval, wreg = 0; 539 int status = urb->status; 540 541 dbg("%s", " : Entering\n"); 542 543 switch (status) { 544 case 0: 545 /* success */ 546 break; 547 case -ECONNRESET: 548 case -ENOENT: 549 case -ESHUTDOWN: 550 /* this urb is terminated, clean up */ 551 dbg("%s - urb shutting down with status: %d", __func__, 552 status); 553 return; 554 default: 555 dbg("%s - nonzero urb status received: %d", __func__, 556 status); 557 goto exit; 558 } 559 560 length = urb->actual_length; 561 data = urb->transfer_buffer; 562 563 serial = urb->context; 564 565 /* Moschip get 5 bytes 566 * Byte 1 IIR Port 1 (port.number is 0) 567 * Byte 2 IIR Port 2 (port.number is 1) 568 * Byte 3 IIR Port 3 (port.number is 2) 569 * Byte 4 IIR Port 4 (port.number is 3) 570 * Byte 5 FIFO status for both */ 571 572 if (length && length > 5) { 573 dbg("%s \n", "Wrong data !!!"); 574 return; 575 } 576 577 sp[0] = (__u8) data[0]; 578 sp[1] = (__u8) data[1]; 579 sp[2] = (__u8) data[2]; 580 sp[3] = (__u8) data[3]; 581 st = (__u8) data[4]; 582 583 for (i = 0; i < serial->num_ports; i++) { 584 mos7840_port = mos7840_get_port_private(serial->port[i]); 585 wval = 586 (((__u16) serial->port[i]->number - 587 (__u16) (serial->minor)) + 1) << 8; 588 if (mos7840_port->open) { 589 if (sp[i] & 0x01) { 590 dbg("SP%d No Interrupt !!!\n", i); 591 } else { 592 switch (sp[i] & 0x0f) { 593 case SERIAL_IIR_RLS: 594 dbg("Serial Port %d: Receiver status error or ", i); 595 dbg("address bit detected in 9-bit mode\n"); 596 mos7840_port->MsrLsr = 1; 597 wreg = LINE_STATUS_REGISTER; 598 break; 599 case SERIAL_IIR_MS: 600 dbg("Serial Port %d: Modem status change\n", i); 601 mos7840_port->MsrLsr = 0; 602 wreg = MODEM_STATUS_REGISTER; 603 break; 604 } 605 spin_lock(&mos7840_port->pool_lock); 606 if (!mos7840_port->zombie) { 607 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data); 608 } else { 609 spin_unlock(&mos7840_port->pool_lock); 610 return; 611 } 612 spin_unlock(&mos7840_port->pool_lock); 613 } 614 } 615 } 616 if (!(rv < 0)) 617 /* the completion handler for the control urb will resubmit */ 618 return; 619 exit: 620 result = usb_submit_urb(urb, GFP_ATOMIC); 621 if (result) { 622 dev_err(&urb->dev->dev, 623 "%s - Error %d submitting interrupt urb\n", 624 __func__, result); 625 } 626 } 627 628 static int mos7840_port_paranoia_check(struct usb_serial_port *port, 629 const char *function) 630 { 631 if (!port) { 632 dbg("%s - port == NULL", function); 633 return -1; 634 } 635 if (!port->serial) { 636 dbg("%s - port->serial == NULL", function); 637 return -1; 638 } 639 640 return 0; 641 } 642 643 /* Inline functions to check the sanity of a pointer that is passed to us */ 644 static int mos7840_serial_paranoia_check(struct usb_serial *serial, 645 const char *function) 646 { 647 if (!serial) { 648 dbg("%s - serial == NULL", function); 649 return -1; 650 } 651 if (!serial->type) { 652 dbg("%s - serial->type == NULL!", function); 653 return -1; 654 } 655 656 return 0; 657 } 658 659 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port, 660 const char *function) 661 { 662 /* if no port was specified, or it fails a paranoia check */ 663 if (!port || 664 mos7840_port_paranoia_check(port, function) || 665 mos7840_serial_paranoia_check(port->serial, function)) { 666 /* then say that we don't have a valid usb_serial thing, 667 * which will end up genrating -ENODEV return values */ 668 return NULL; 669 } 670 671 return port->serial; 672 } 673 674 /***************************************************************************** 675 * mos7840_bulk_in_callback 676 * this is the callback function for when we have received data on the 677 * bulk in endpoint. 678 *****************************************************************************/ 679 680 static void mos7840_bulk_in_callback(struct urb *urb) 681 { 682 int retval; 683 unsigned char *data; 684 struct usb_serial *serial; 685 struct usb_serial_port *port; 686 struct moschip_port *mos7840_port; 687 struct tty_struct *tty; 688 int status = urb->status; 689 690 mos7840_port = urb->context; 691 if (!mos7840_port) { 692 dbg("%s", "NULL mos7840_port pointer \n"); 693 mos7840_port->read_urb_busy = false; 694 return; 695 } 696 697 if (status) { 698 dbg("nonzero read bulk status received: %d", status); 699 mos7840_port->read_urb_busy = false; 700 return; 701 } 702 703 port = (struct usb_serial_port *)mos7840_port->port; 704 if (mos7840_port_paranoia_check(port, __func__)) { 705 dbg("%s", "Port Paranoia failed \n"); 706 mos7840_port->read_urb_busy = false; 707 return; 708 } 709 710 serial = mos7840_get_usb_serial(port, __func__); 711 if (!serial) { 712 dbg("%s\n", "Bad serial pointer "); 713 mos7840_port->read_urb_busy = false; 714 return; 715 } 716 717 dbg("%s\n", "Entering... \n"); 718 719 data = urb->transfer_buffer; 720 721 dbg("%s", "Entering ........... \n"); 722 723 if (urb->actual_length) { 724 tty = tty_port_tty_get(&mos7840_port->port->port); 725 if (tty) { 726 tty_buffer_request_room(tty, urb->actual_length); 727 tty_insert_flip_string(tty, data, urb->actual_length); 728 dbg(" %s \n", data); 729 tty_flip_buffer_push(tty); 730 tty_kref_put(tty); 731 } 732 mos7840_port->icount.rx += urb->actual_length; 733 smp_wmb(); 734 dbg("mos7840_port->icount.rx is %d:\n", 735 mos7840_port->icount.rx); 736 } 737 738 if (!mos7840_port->read_urb) { 739 dbg("%s", "URB KILLED !!!\n"); 740 mos7840_port->read_urb_busy = false; 741 return; 742 } 743 744 745 mos7840_port->read_urb->dev = serial->dev; 746 747 mos7840_port->read_urb_busy = true; 748 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC); 749 750 if (retval) { 751 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval); 752 mos7840_port->read_urb_busy = false; 753 } 754 } 755 756 /***************************************************************************** 757 * mos7840_bulk_out_data_callback 758 * this is the callback function for when we have finished sending 759 * serial data on the bulk out endpoint. 760 *****************************************************************************/ 761 762 static void mos7840_bulk_out_data_callback(struct urb *urb) 763 { 764 struct moschip_port *mos7840_port; 765 struct tty_struct *tty; 766 int status = urb->status; 767 int i; 768 769 mos7840_port = urb->context; 770 spin_lock(&mos7840_port->pool_lock); 771 for (i = 0; i < NUM_URBS; i++) { 772 if (urb == mos7840_port->write_urb_pool[i]) { 773 mos7840_port->busy[i] = 0; 774 break; 775 } 776 } 777 spin_unlock(&mos7840_port->pool_lock); 778 779 if (status) { 780 dbg("nonzero write bulk status received:%d\n", status); 781 return; 782 } 783 784 if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) { 785 dbg("%s", "Port Paranoia failed \n"); 786 return; 787 } 788 789 dbg("%s \n", "Entering ........."); 790 791 tty = tty_port_tty_get(&mos7840_port->port->port); 792 if (tty && mos7840_port->open) 793 tty_wakeup(tty); 794 tty_kref_put(tty); 795 796 } 797 798 /************************************************************************/ 799 /* 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 */ 800 /************************************************************************/ 801 #ifdef MCSSerialProbe 802 static int mos7840_serial_probe(struct usb_serial *serial, 803 const struct usb_device_id *id) 804 { 805 806 /*need to implement the mode_reg reading and updating\ 807 structures usb_serial_ device_type\ 808 (i.e num_ports, num_bulkin,bulkout etc) */ 809 /* Also we can update the changes attach */ 810 return 1; 811 } 812 #endif 813 814 /***************************************************************************** 815 * mos7840_open 816 * this function is called by the tty driver when a port is opened 817 * If successful, we return 0 818 * Otherwise we return a negative error number. 819 *****************************************************************************/ 820 821 static int mos7840_open(struct tty_struct *tty, 822 struct usb_serial_port *port, struct file *filp) 823 { 824 int response; 825 int j; 826 struct usb_serial *serial; 827 struct urb *urb; 828 __u16 Data; 829 int status; 830 struct moschip_port *mos7840_port; 831 struct moschip_port *port0; 832 833 if (mos7840_port_paranoia_check(port, __func__)) { 834 dbg("%s", "Port Paranoia failed \n"); 835 return -ENODEV; 836 } 837 838 serial = port->serial; 839 840 if (mos7840_serial_paranoia_check(serial, __func__)) { 841 dbg("%s", "Serial Paranoia failed \n"); 842 return -ENODEV; 843 } 844 845 mos7840_port = mos7840_get_port_private(port); 846 port0 = mos7840_get_port_private(serial->port[0]); 847 848 if (mos7840_port == NULL || port0 == NULL) 849 return -ENODEV; 850 851 usb_clear_halt(serial->dev, port->write_urb->pipe); 852 usb_clear_halt(serial->dev, port->read_urb->pipe); 853 port0->open_ports++; 854 855 /* Initialising the write urb pool */ 856 for (j = 0; j < NUM_URBS; ++j) { 857 urb = usb_alloc_urb(0, GFP_KERNEL); 858 mos7840_port->write_urb_pool[j] = urb; 859 860 if (urb == NULL) { 861 dev_err(&port->dev, "No more urbs???\n"); 862 continue; 863 } 864 865 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, 866 GFP_KERNEL); 867 if (!urb->transfer_buffer) { 868 usb_free_urb(urb); 869 mos7840_port->write_urb_pool[j] = NULL; 870 dev_err(&port->dev, 871 "%s-out of memory for urb buffers.\n", 872 __func__); 873 continue; 874 } 875 } 876 877 /***************************************************************************** 878 * Initialize MCS7840 -- Write Init values to corresponding Registers 879 * 880 * Register Index 881 * 1 : IER 882 * 2 : FCR 883 * 3 : LCR 884 * 4 : MCR 885 * 886 * 0x08 : SP1/2 Control Reg 887 *****************************************************************************/ 888 889 /* NEED to check the following Block */ 890 891 Data = 0x0; 892 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data); 893 if (status < 0) { 894 dbg("Reading Spreg failed\n"); 895 return -1; 896 } 897 Data |= 0x80; 898 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data); 899 if (status < 0) { 900 dbg("writing Spreg failed\n"); 901 return -1; 902 } 903 904 Data &= ~0x80; 905 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data); 906 if (status < 0) { 907 dbg("writing Spreg failed\n"); 908 return -1; 909 } 910 /* End of block to be checked */ 911 912 Data = 0x0; 913 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, 914 &Data); 915 if (status < 0) { 916 dbg("Reading Controlreg failed\n"); 917 return -1; 918 } 919 Data |= 0x08; /* Driver done bit */ 920 Data |= 0x20; /* rx_disable */ 921 status = mos7840_set_reg_sync(port, 922 mos7840_port->ControlRegOffset, Data); 923 if (status < 0) { 924 dbg("writing Controlreg failed\n"); 925 return -1; 926 } 927 /* do register settings here */ 928 /* Set all regs to the device default values. */ 929 /*********************************** 930 * First Disable all interrupts. 931 ***********************************/ 932 Data = 0x00; 933 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data); 934 if (status < 0) { 935 dbg("disableing interrupts failed\n"); 936 return -1; 937 } 938 /* Set FIFO_CONTROL_REGISTER to the default value */ 939 Data = 0x00; 940 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data); 941 if (status < 0) { 942 dbg("Writing FIFO_CONTROL_REGISTER failed\n"); 943 return -1; 944 } 945 946 Data = 0xcf; 947 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data); 948 if (status < 0) { 949 dbg("Writing FIFO_CONTROL_REGISTER failed\n"); 950 return -1; 951 } 952 953 Data = 0x03; 954 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 955 mos7840_port->shadowLCR = Data; 956 957 Data = 0x0b; 958 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data); 959 mos7840_port->shadowMCR = Data; 960 961 Data = 0x00; 962 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data); 963 mos7840_port->shadowLCR = Data; 964 965 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */ 966 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 967 968 Data = 0x0c; 969 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data); 970 971 Data = 0x0; 972 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data); 973 974 Data = 0x00; 975 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data); 976 977 Data = Data & ~SERIAL_LCR_DLAB; 978 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 979 mos7840_port->shadowLCR = Data; 980 981 /* clearing Bulkin and Bulkout Fifo */ 982 Data = 0x0; 983 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data); 984 985 Data = Data | 0x0c; 986 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data); 987 988 Data = Data & ~0x0c; 989 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data); 990 /* Finally enable all interrupts */ 991 Data = 0x0c; 992 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data); 993 994 /* clearing rx_disable */ 995 Data = 0x0; 996 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, 997 &Data); 998 Data = Data & ~0x20; 999 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, 1000 Data); 1001 1002 /* rx_negate */ 1003 Data = 0x0; 1004 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, 1005 &Data); 1006 Data = Data | 0x10; 1007 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, 1008 Data); 1009 1010 /* Check to see if we've set up our endpoint info yet * 1011 * (can't set it up in mos7840_startup as the structures * 1012 * were not set up at that time.) */ 1013 if (port0->open_ports == 1) { 1014 if (serial->port[0]->interrupt_in_buffer == NULL) { 1015 /* set up interrupt urb */ 1016 usb_fill_int_urb(serial->port[0]->interrupt_in_urb, 1017 serial->dev, 1018 usb_rcvintpipe(serial->dev, 1019 serial->port[0]->interrupt_in_endpointAddress), 1020 serial->port[0]->interrupt_in_buffer, 1021 serial->port[0]->interrupt_in_urb-> 1022 transfer_buffer_length, 1023 mos7840_interrupt_callback, 1024 serial, 1025 serial->port[0]->interrupt_in_urb->interval); 1026 1027 /* start interrupt read for mos7840 * 1028 * will continue as long as mos7840 is connected */ 1029 1030 response = 1031 usb_submit_urb(serial->port[0]->interrupt_in_urb, 1032 GFP_KERNEL); 1033 if (response) { 1034 dev_err(&port->dev, "%s - Error %d submitting " 1035 "interrupt urb\n", __func__, response); 1036 } 1037 1038 } 1039 1040 } 1041 1042 /* see if we've set up our endpoint info yet * 1043 * (can't set it up in mos7840_startup as the * 1044 * structures were not set up at that time.) */ 1045 1046 dbg("port number is %d \n", port->number); 1047 dbg("serial number is %d \n", port->serial->minor); 1048 dbg("Bulkin endpoint is %d \n", port->bulk_in_endpointAddress); 1049 dbg("BulkOut endpoint is %d \n", port->bulk_out_endpointAddress); 1050 dbg("Interrupt endpoint is %d \n", port->interrupt_in_endpointAddress); 1051 dbg("port's number in the device is %d\n", mos7840_port->port_num); 1052 mos7840_port->read_urb = port->read_urb; 1053 1054 /* set up our bulk in urb */ 1055 1056 usb_fill_bulk_urb(mos7840_port->read_urb, 1057 serial->dev, 1058 usb_rcvbulkpipe(serial->dev, 1059 port->bulk_in_endpointAddress), 1060 port->bulk_in_buffer, 1061 mos7840_port->read_urb->transfer_buffer_length, 1062 mos7840_bulk_in_callback, mos7840_port); 1063 1064 dbg("mos7840_open: bulkin endpoint is %d\n", 1065 port->bulk_in_endpointAddress); 1066 mos7840_port->read_urb_busy = true; 1067 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL); 1068 if (response) { 1069 dev_err(&port->dev, "%s - Error %d submitting control urb\n", 1070 __func__, response); 1071 mos7840_port->read_urb_busy = false; 1072 } 1073 1074 /* initialize our wait queues */ 1075 init_waitqueue_head(&mos7840_port->wait_chase); 1076 init_waitqueue_head(&mos7840_port->delta_msr_wait); 1077 1078 /* initialize our icount structure */ 1079 memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount)); 1080 1081 /* initialize our port settings */ 1082 /* Must set to enable ints! */ 1083 mos7840_port->shadowMCR = MCR_MASTER_IE; 1084 /* send a open port command */ 1085 mos7840_port->open = 1; 1086 /* mos7840_change_port_settings(mos7840_port,old_termios); */ 1087 mos7840_port->icount.tx = 0; 1088 mos7840_port->icount.rx = 0; 1089 1090 dbg("\n\nusb_serial serial:%p mos7840_port:%p\n usb_serial_port port:%p\n\n", 1091 serial, mos7840_port, port); 1092 1093 return 0; 1094 1095 } 1096 1097 /***************************************************************************** 1098 * mos7840_chars_in_buffer 1099 * this function is called by the tty driver when it wants to know how many 1100 * bytes of data we currently have outstanding in the port (data that has 1101 * been written, but hasn't made it out the port yet) 1102 * If successful, we return the number of bytes left to be written in the 1103 * system, 1104 * Otherwise we return zero. 1105 *****************************************************************************/ 1106 1107 static int mos7840_chars_in_buffer(struct tty_struct *tty) 1108 { 1109 struct usb_serial_port *port = tty->driver_data; 1110 int i; 1111 int chars = 0; 1112 unsigned long flags; 1113 struct moschip_port *mos7840_port; 1114 1115 dbg("%s \n", " mos7840_chars_in_buffer:entering ..........."); 1116 1117 if (mos7840_port_paranoia_check(port, __func__)) { 1118 dbg("%s", "Invalid port \n"); 1119 return 0; 1120 } 1121 1122 mos7840_port = mos7840_get_port_private(port); 1123 if (mos7840_port == NULL) { 1124 dbg("%s \n", "mos7840_break:leaving ..........."); 1125 return 0; 1126 } 1127 1128 spin_lock_irqsave(&mos7840_port->pool_lock, flags); 1129 for (i = 0; i < NUM_URBS; ++i) 1130 if (mos7840_port->busy[i]) 1131 chars += URB_TRANSFER_BUFFER_SIZE; 1132 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags); 1133 dbg("%s - returns %d", __func__, chars); 1134 return chars; 1135 1136 } 1137 1138 /************************************************************************ 1139 * 1140 * mos7840_block_until_tx_empty 1141 * 1142 * This function will block the close until one of the following: 1143 * 1. TX count are 0 1144 * 2. The mos7840 has stopped 1145 * 3. A timeout of 3 seconds without activity has expired 1146 * 1147 ************************************************************************/ 1148 static void mos7840_block_until_tx_empty(struct tty_struct *tty, 1149 struct moschip_port *mos7840_port) 1150 { 1151 int timeout = HZ / 10; 1152 int wait = 30; 1153 int count; 1154 1155 while (1) { 1156 1157 count = mos7840_chars_in_buffer(tty); 1158 1159 /* Check for Buffer status */ 1160 if (count <= 0) 1161 return; 1162 1163 /* Block the thread for a while */ 1164 interruptible_sleep_on_timeout(&mos7840_port->wait_chase, 1165 timeout); 1166 1167 /* No activity.. count down section */ 1168 wait--; 1169 if (wait == 0) { 1170 dbg("%s - TIMEOUT", __func__); 1171 return; 1172 } else { 1173 /* Reset timeout value back to seconds */ 1174 wait = 30; 1175 } 1176 } 1177 } 1178 1179 /***************************************************************************** 1180 * mos7840_close 1181 * this function is called by the tty driver when a port is closed 1182 *****************************************************************************/ 1183 1184 static void mos7840_close(struct tty_struct *tty, 1185 struct usb_serial_port *port, struct file *filp) 1186 { 1187 struct usb_serial *serial; 1188 struct moschip_port *mos7840_port; 1189 struct moschip_port *port0; 1190 int j; 1191 __u16 Data; 1192 1193 dbg("%s\n", "mos7840_close:entering..."); 1194 1195 if (mos7840_port_paranoia_check(port, __func__)) { 1196 dbg("%s", "Port Paranoia failed \n"); 1197 return; 1198 } 1199 1200 serial = mos7840_get_usb_serial(port, __func__); 1201 if (!serial) { 1202 dbg("%s", "Serial Paranoia failed \n"); 1203 return; 1204 } 1205 1206 mos7840_port = mos7840_get_port_private(port); 1207 port0 = mos7840_get_port_private(serial->port[0]); 1208 1209 if (mos7840_port == NULL || port0 == NULL) 1210 return; 1211 1212 for (j = 0; j < NUM_URBS; ++j) 1213 usb_kill_urb(mos7840_port->write_urb_pool[j]); 1214 1215 /* Freeing Write URBs */ 1216 for (j = 0; j < NUM_URBS; ++j) { 1217 if (mos7840_port->write_urb_pool[j]) { 1218 if (mos7840_port->write_urb_pool[j]->transfer_buffer) 1219 kfree(mos7840_port->write_urb_pool[j]-> 1220 transfer_buffer); 1221 1222 usb_free_urb(mos7840_port->write_urb_pool[j]); 1223 } 1224 } 1225 1226 if (serial->dev) 1227 /* flush and block until tx is empty */ 1228 mos7840_block_until_tx_empty(tty, mos7840_port); 1229 1230 /* While closing port, shutdown all bulk read, write * 1231 * and interrupt read if they exists */ 1232 if (serial->dev) { 1233 if (mos7840_port->write_urb) { 1234 dbg("%s", "Shutdown bulk write\n"); 1235 usb_kill_urb(mos7840_port->write_urb); 1236 } 1237 if (mos7840_port->read_urb) { 1238 dbg("%s", "Shutdown bulk read\n"); 1239 usb_kill_urb(mos7840_port->read_urb); 1240 mos7840_port->read_urb_busy = false; 1241 } 1242 if ((&mos7840_port->control_urb)) { 1243 dbg("%s", "Shutdown control read\n"); 1244 /*/ usb_kill_urb (mos7840_port->control_urb); */ 1245 } 1246 } 1247 /* if(mos7840_port->ctrl_buf != NULL) */ 1248 /* kfree(mos7840_port->ctrl_buf); */ 1249 port0->open_ports--; 1250 dbg("mos7840_num_open_ports in close%d:in port%d\n", 1251 port0->open_ports, port->number); 1252 if (port0->open_ports == 0) { 1253 if (serial->port[0]->interrupt_in_urb) { 1254 dbg("%s", "Shutdown interrupt_in_urb\n"); 1255 usb_kill_urb(serial->port[0]->interrupt_in_urb); 1256 } 1257 } 1258 1259 if (mos7840_port->write_urb) { 1260 /* if this urb had a transfer buffer already (old tx) free it */ 1261 if (mos7840_port->write_urb->transfer_buffer != NULL) 1262 kfree(mos7840_port->write_urb->transfer_buffer); 1263 usb_free_urb(mos7840_port->write_urb); 1264 } 1265 1266 Data = 0x0; 1267 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data); 1268 1269 Data = 0x00; 1270 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data); 1271 1272 mos7840_port->open = 0; 1273 1274 dbg("%s \n", "Leaving ............"); 1275 } 1276 1277 /************************************************************************ 1278 * 1279 * mos7840_block_until_chase_response 1280 * 1281 * This function will block the close until one of the following: 1282 * 1. Response to our Chase comes from mos7840 1283 * 2. A timeout of 10 seconds without activity has expired 1284 * (1K of mos7840 data @ 2400 baud ==> 4 sec to empty) 1285 * 1286 ************************************************************************/ 1287 1288 static void mos7840_block_until_chase_response(struct tty_struct *tty, 1289 struct moschip_port *mos7840_port) 1290 { 1291 int timeout = 1 * HZ; 1292 int wait = 10; 1293 int count; 1294 1295 while (1) { 1296 count = mos7840_chars_in_buffer(tty); 1297 1298 /* Check for Buffer status */ 1299 if (count <= 0) 1300 return; 1301 1302 /* Block the thread for a while */ 1303 interruptible_sleep_on_timeout(&mos7840_port->wait_chase, 1304 timeout); 1305 /* No activity.. count down section */ 1306 wait--; 1307 if (wait == 0) { 1308 dbg("%s - TIMEOUT", __func__); 1309 return; 1310 } else { 1311 /* Reset timeout value back to seconds */ 1312 wait = 10; 1313 } 1314 } 1315 1316 } 1317 1318 /***************************************************************************** 1319 * mos7840_break 1320 * this function sends a break to the port 1321 *****************************************************************************/ 1322 static void mos7840_break(struct tty_struct *tty, int break_state) 1323 { 1324 struct usb_serial_port *port = tty->driver_data; 1325 unsigned char data; 1326 struct usb_serial *serial; 1327 struct moschip_port *mos7840_port; 1328 1329 dbg("%s \n", "Entering ..........."); 1330 dbg("mos7840_break: Start\n"); 1331 1332 if (mos7840_port_paranoia_check(port, __func__)) { 1333 dbg("%s", "Port Paranoia failed \n"); 1334 return; 1335 } 1336 1337 serial = mos7840_get_usb_serial(port, __func__); 1338 if (!serial) { 1339 dbg("%s", "Serial Paranoia failed \n"); 1340 return; 1341 } 1342 1343 mos7840_port = mos7840_get_port_private(port); 1344 1345 if (mos7840_port == NULL) 1346 return; 1347 1348 if (serial->dev) 1349 /* flush and block until tx is empty */ 1350 mos7840_block_until_chase_response(tty, mos7840_port); 1351 1352 if (break_state == -1) 1353 data = mos7840_port->shadowLCR | LCR_SET_BREAK; 1354 else 1355 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK; 1356 1357 /* FIXME: no locking on shadowLCR anywhere in driver */ 1358 mos7840_port->shadowLCR = data; 1359 dbg("mcs7840_break mos7840_port->shadowLCR is %x\n", 1360 mos7840_port->shadowLCR); 1361 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, 1362 mos7840_port->shadowLCR); 1363 1364 return; 1365 } 1366 1367 /***************************************************************************** 1368 * mos7840_write_room 1369 * this function is called by the tty driver when it wants to know how many 1370 * bytes of data we can accept for a specific port. 1371 * If successful, we return the amount of room that we have for this port 1372 * Otherwise we return a negative error number. 1373 *****************************************************************************/ 1374 1375 static int mos7840_write_room(struct tty_struct *tty) 1376 { 1377 struct usb_serial_port *port = tty->driver_data; 1378 int i; 1379 int room = 0; 1380 unsigned long flags; 1381 struct moschip_port *mos7840_port; 1382 1383 dbg("%s \n", " mos7840_write_room:entering ..........."); 1384 1385 if (mos7840_port_paranoia_check(port, __func__)) { 1386 dbg("%s", "Invalid port \n"); 1387 dbg("%s \n", " mos7840_write_room:leaving ..........."); 1388 return -1; 1389 } 1390 1391 mos7840_port = mos7840_get_port_private(port); 1392 if (mos7840_port == NULL) { 1393 dbg("%s \n", "mos7840_break:leaving ..........."); 1394 return -1; 1395 } 1396 1397 spin_lock_irqsave(&mos7840_port->pool_lock, flags); 1398 for (i = 0; i < NUM_URBS; ++i) { 1399 if (!mos7840_port->busy[i]) 1400 room += URB_TRANSFER_BUFFER_SIZE; 1401 } 1402 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags); 1403 1404 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1; 1405 dbg("%s - returns %d", __func__, room); 1406 return room; 1407 1408 } 1409 1410 /***************************************************************************** 1411 * mos7840_write 1412 * this function is called by the tty driver when data should be written to 1413 * the port. 1414 * If successful, we return the number of bytes written, otherwise we 1415 * return a negative error number. 1416 *****************************************************************************/ 1417 1418 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port, 1419 const unsigned char *data, int count) 1420 { 1421 int status; 1422 int i; 1423 int bytes_sent = 0; 1424 int transfer_size; 1425 unsigned long flags; 1426 1427 struct moschip_port *mos7840_port; 1428 struct usb_serial *serial; 1429 struct urb *urb; 1430 /* __u16 Data; */ 1431 const unsigned char *current_position = data; 1432 unsigned char *data1; 1433 dbg("%s \n", "entering ..........."); 1434 /* dbg("mos7840_write: mos7840_port->shadowLCR is %x\n", 1435 mos7840_port->shadowLCR); */ 1436 1437 #ifdef NOTMOS7840 1438 Data = 0x00; 1439 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data); 1440 mos7840_port->shadowLCR = Data; 1441 dbg("mos7840_write: LINE_CONTROL_REGISTER is %x\n", Data); 1442 dbg("mos7840_write: mos7840_port->shadowLCR is %x\n", 1443 mos7840_port->shadowLCR); 1444 1445 /* Data = 0x03; */ 1446 /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */ 1447 /* mos7840_port->shadowLCR=Data;//Need to add later */ 1448 1449 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */ 1450 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 1451 1452 /* Data = 0x0c; */ 1453 /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */ 1454 Data = 0x00; 1455 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data); 1456 dbg("mos7840_write:DLL value is %x\n", Data); 1457 1458 Data = 0x0; 1459 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data); 1460 dbg("mos7840_write:DLM value is %x\n", Data); 1461 1462 Data = Data & ~SERIAL_LCR_DLAB; 1463 dbg("mos7840_write: mos7840_port->shadowLCR is %x\n", 1464 mos7840_port->shadowLCR); 1465 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 1466 #endif 1467 1468 if (mos7840_port_paranoia_check(port, __func__)) { 1469 dbg("%s", "Port Paranoia failed \n"); 1470 return -1; 1471 } 1472 1473 serial = port->serial; 1474 if (mos7840_serial_paranoia_check(serial, __func__)) { 1475 dbg("%s", "Serial Paranoia failed \n"); 1476 return -1; 1477 } 1478 1479 mos7840_port = mos7840_get_port_private(port); 1480 if (mos7840_port == NULL) { 1481 dbg("%s", "mos7840_port is NULL\n"); 1482 return -1; 1483 } 1484 1485 /* try to find a free urb in the list */ 1486 urb = NULL; 1487 1488 spin_lock_irqsave(&mos7840_port->pool_lock, flags); 1489 for (i = 0; i < NUM_URBS; ++i) { 1490 if (!mos7840_port->busy[i]) { 1491 mos7840_port->busy[i] = 1; 1492 urb = mos7840_port->write_urb_pool[i]; 1493 dbg("\nURB:%d", i); 1494 break; 1495 } 1496 } 1497 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags); 1498 1499 if (urb == NULL) { 1500 dbg("%s - no more free urbs", __func__); 1501 goto exit; 1502 } 1503 1504 if (urb->transfer_buffer == NULL) { 1505 urb->transfer_buffer = 1506 kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL); 1507 1508 if (urb->transfer_buffer == NULL) { 1509 dev_err(&port->dev, "%s no more kernel memory...\n", 1510 __func__); 1511 goto exit; 1512 } 1513 } 1514 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE); 1515 1516 memcpy(urb->transfer_buffer, current_position, transfer_size); 1517 1518 /* fill urb with data and submit */ 1519 usb_fill_bulk_urb(urb, 1520 serial->dev, 1521 usb_sndbulkpipe(serial->dev, 1522 port->bulk_out_endpointAddress), 1523 urb->transfer_buffer, 1524 transfer_size, 1525 mos7840_bulk_out_data_callback, mos7840_port); 1526 1527 data1 = urb->transfer_buffer; 1528 dbg("\nbulkout endpoint is %d", port->bulk_out_endpointAddress); 1529 1530 /* send it down the pipe */ 1531 status = usb_submit_urb(urb, GFP_ATOMIC); 1532 1533 if (status) { 1534 mos7840_port->busy[i] = 0; 1535 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed " 1536 "with status = %d\n", __func__, status); 1537 bytes_sent = status; 1538 goto exit; 1539 } 1540 bytes_sent = transfer_size; 1541 mos7840_port->icount.tx += transfer_size; 1542 smp_wmb(); 1543 dbg("mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx); 1544 exit: 1545 return bytes_sent; 1546 1547 } 1548 1549 /***************************************************************************** 1550 * mos7840_throttle 1551 * this function is called by the tty driver when it wants to stop the data 1552 * being read from the port. 1553 *****************************************************************************/ 1554 1555 static void mos7840_throttle(struct tty_struct *tty) 1556 { 1557 struct usb_serial_port *port = tty->driver_data; 1558 struct moschip_port *mos7840_port; 1559 int status; 1560 1561 if (mos7840_port_paranoia_check(port, __func__)) { 1562 dbg("%s", "Invalid port \n"); 1563 return; 1564 } 1565 1566 dbg("- port %d\n", port->number); 1567 1568 mos7840_port = mos7840_get_port_private(port); 1569 1570 if (mos7840_port == NULL) 1571 return; 1572 1573 if (!mos7840_port->open) { 1574 dbg("%s\n", "port not opened"); 1575 return; 1576 } 1577 1578 dbg("%s", "Entering .......... \n"); 1579 1580 /* if we are implementing XON/XOFF, send the stop character */ 1581 if (I_IXOFF(tty)) { 1582 unsigned char stop_char = STOP_CHAR(tty); 1583 status = mos7840_write(tty, port, &stop_char, 1); 1584 if (status <= 0) 1585 return; 1586 } 1587 /* if we are implementing RTS/CTS, toggle that line */ 1588 if (tty->termios->c_cflag & CRTSCTS) { 1589 mos7840_port->shadowMCR &= ~MCR_RTS; 1590 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, 1591 mos7840_port->shadowMCR); 1592 if (status < 0) 1593 return; 1594 } 1595 1596 return; 1597 } 1598 1599 /***************************************************************************** 1600 * mos7840_unthrottle 1601 * this function is called by the tty driver when it wants to resume 1602 * the data being read from the port (called after mos7840_throttle is 1603 * called) 1604 *****************************************************************************/ 1605 static void mos7840_unthrottle(struct tty_struct *tty) 1606 { 1607 struct usb_serial_port *port = tty->driver_data; 1608 int status; 1609 struct moschip_port *mos7840_port = mos7840_get_port_private(port); 1610 1611 if (mos7840_port_paranoia_check(port, __func__)) { 1612 dbg("%s", "Invalid port \n"); 1613 return; 1614 } 1615 1616 if (mos7840_port == NULL) 1617 return; 1618 1619 if (!mos7840_port->open) { 1620 dbg("%s - port not opened", __func__); 1621 return; 1622 } 1623 1624 dbg("%s", "Entering .......... \n"); 1625 1626 /* if we are implementing XON/XOFF, send the start character */ 1627 if (I_IXOFF(tty)) { 1628 unsigned char start_char = START_CHAR(tty); 1629 status = mos7840_write(tty, port, &start_char, 1); 1630 if (status <= 0) 1631 return; 1632 } 1633 1634 /* if we are implementing RTS/CTS, toggle that line */ 1635 if (tty->termios->c_cflag & CRTSCTS) { 1636 mos7840_port->shadowMCR |= MCR_RTS; 1637 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, 1638 mos7840_port->shadowMCR); 1639 if (status < 0) 1640 return; 1641 } 1642 } 1643 1644 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file) 1645 { 1646 struct usb_serial_port *port = tty->driver_data; 1647 struct moschip_port *mos7840_port; 1648 unsigned int result; 1649 __u16 msr; 1650 __u16 mcr; 1651 int status; 1652 mos7840_port = mos7840_get_port_private(port); 1653 1654 dbg("%s - port %d", __func__, port->number); 1655 1656 if (mos7840_port == NULL) 1657 return -ENODEV; 1658 1659 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr); 1660 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr); 1661 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0) 1662 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0) 1663 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0) 1664 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0) 1665 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0) 1666 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0) 1667 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0); 1668 1669 dbg("%s - 0x%04X", __func__, result); 1670 1671 return result; 1672 } 1673 1674 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file, 1675 unsigned int set, unsigned int clear) 1676 { 1677 struct usb_serial_port *port = tty->driver_data; 1678 struct moschip_port *mos7840_port; 1679 unsigned int mcr; 1680 int status; 1681 1682 dbg("%s - port %d", __func__, port->number); 1683 1684 mos7840_port = mos7840_get_port_private(port); 1685 1686 if (mos7840_port == NULL) 1687 return -ENODEV; 1688 1689 /* FIXME: What locks the port registers ? */ 1690 mcr = mos7840_port->shadowMCR; 1691 if (clear & TIOCM_RTS) 1692 mcr &= ~MCR_RTS; 1693 if (clear & TIOCM_DTR) 1694 mcr &= ~MCR_DTR; 1695 if (clear & TIOCM_LOOP) 1696 mcr &= ~MCR_LOOPBACK; 1697 1698 if (set & TIOCM_RTS) 1699 mcr |= MCR_RTS; 1700 if (set & TIOCM_DTR) 1701 mcr |= MCR_DTR; 1702 if (set & TIOCM_LOOP) 1703 mcr |= MCR_LOOPBACK; 1704 1705 mos7840_port->shadowMCR = mcr; 1706 1707 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr); 1708 if (status < 0) { 1709 dbg("setting MODEM_CONTROL_REGISTER Failed\n"); 1710 return status; 1711 } 1712 1713 return 0; 1714 } 1715 1716 /***************************************************************************** 1717 * mos7840_calc_baud_rate_divisor 1718 * this function calculates the proper baud rate divisor for the specified 1719 * baud rate. 1720 *****************************************************************************/ 1721 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor, 1722 __u16 *clk_sel_val) 1723 { 1724 1725 dbg("%s - %d", __func__, baudRate); 1726 1727 if (baudRate <= 115200) { 1728 *divisor = 115200 / baudRate; 1729 *clk_sel_val = 0x0; 1730 } 1731 if ((baudRate > 115200) && (baudRate <= 230400)) { 1732 *divisor = 230400 / baudRate; 1733 *clk_sel_val = 0x10; 1734 } else if ((baudRate > 230400) && (baudRate <= 403200)) { 1735 *divisor = 403200 / baudRate; 1736 *clk_sel_val = 0x20; 1737 } else if ((baudRate > 403200) && (baudRate <= 460800)) { 1738 *divisor = 460800 / baudRate; 1739 *clk_sel_val = 0x30; 1740 } else if ((baudRate > 460800) && (baudRate <= 806400)) { 1741 *divisor = 806400 / baudRate; 1742 *clk_sel_val = 0x40; 1743 } else if ((baudRate > 806400) && (baudRate <= 921600)) { 1744 *divisor = 921600 / baudRate; 1745 *clk_sel_val = 0x50; 1746 } else if ((baudRate > 921600) && (baudRate <= 1572864)) { 1747 *divisor = 1572864 / baudRate; 1748 *clk_sel_val = 0x60; 1749 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) { 1750 *divisor = 3145728 / baudRate; 1751 *clk_sel_val = 0x70; 1752 } 1753 return 0; 1754 1755 #ifdef NOTMCS7840 1756 1757 for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) { 1758 if (mos7840_divisor_table[i].BaudRate == baudrate) { 1759 *divisor = mos7840_divisor_table[i].Divisor; 1760 return 0; 1761 } 1762 } 1763 1764 /* After trying for all the standard baud rates * 1765 * Try calculating the divisor for this baud rate */ 1766 1767 if (baudrate > 75 && baudrate < 230400) { 1768 /* get the divisor */ 1769 custom = (__u16) (230400L / baudrate); 1770 1771 /* Check for round off */ 1772 round1 = (__u16) (2304000L / baudrate); 1773 round = (__u16) (round1 - (custom * 10)); 1774 if (round > 4) 1775 custom++; 1776 *divisor = custom; 1777 1778 dbg(" Baud %d = %d\n", baudrate, custom); 1779 return 0; 1780 } 1781 1782 dbg("%s\n", " Baud calculation Failed..."); 1783 return -1; 1784 #endif 1785 } 1786 1787 /***************************************************************************** 1788 * mos7840_send_cmd_write_baud_rate 1789 * this function sends the proper command to change the baud rate of the 1790 * specified port. 1791 *****************************************************************************/ 1792 1793 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port, 1794 int baudRate) 1795 { 1796 int divisor = 0; 1797 int status; 1798 __u16 Data; 1799 unsigned char number; 1800 __u16 clk_sel_val; 1801 struct usb_serial_port *port; 1802 1803 if (mos7840_port == NULL) 1804 return -1; 1805 1806 port = (struct usb_serial_port *)mos7840_port->port; 1807 if (mos7840_port_paranoia_check(port, __func__)) { 1808 dbg("%s", "Invalid port \n"); 1809 return -1; 1810 } 1811 1812 if (mos7840_serial_paranoia_check(port->serial, __func__)) { 1813 dbg("%s", "Invalid Serial \n"); 1814 return -1; 1815 } 1816 1817 dbg("%s", "Entering .......... \n"); 1818 1819 number = mos7840_port->port->number - mos7840_port->port->serial->minor; 1820 1821 dbg("%s - port = %d, baud = %d", __func__, 1822 mos7840_port->port->number, baudRate); 1823 /* reset clk_uart_sel in spregOffset */ 1824 if (baudRate > 115200) { 1825 #ifdef HW_flow_control 1826 /* NOTE: need to see the pther register to modify */ 1827 /* setting h/w flow control bit to 1 */ 1828 Data = 0x2b; 1829 mos7840_port->shadowMCR = Data; 1830 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, 1831 Data); 1832 if (status < 0) { 1833 dbg("Writing spreg failed in set_serial_baud\n"); 1834 return -1; 1835 } 1836 #endif 1837 1838 } else { 1839 #ifdef HW_flow_control 1840 / *setting h/w flow control bit to 0 */ 1841 Data = 0xb; 1842 mos7840_port->shadowMCR = Data; 1843 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, 1844 Data); 1845 if (status < 0) { 1846 dbg("Writing spreg failed in set_serial_baud\n"); 1847 return -1; 1848 } 1849 #endif 1850 1851 } 1852 1853 if (1) { /* baudRate <= 115200) */ 1854 clk_sel_val = 0x0; 1855 Data = 0x0; 1856 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor, 1857 &clk_sel_val); 1858 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, 1859 &Data); 1860 if (status < 0) { 1861 dbg("reading spreg failed in set_serial_baud\n"); 1862 return -1; 1863 } 1864 Data = (Data & 0x8f) | clk_sel_val; 1865 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, 1866 Data); 1867 if (status < 0) { 1868 dbg("Writing spreg failed in set_serial_baud\n"); 1869 return -1; 1870 } 1871 /* Calculate the Divisor */ 1872 1873 if (status) { 1874 dev_err(&port->dev, "%s - bad baud rate\n", __func__); 1875 return status; 1876 } 1877 /* Enable access to divisor latch */ 1878 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB; 1879 mos7840_port->shadowLCR = Data; 1880 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 1881 1882 /* Write the divisor */ 1883 Data = (unsigned char)(divisor & 0xff); 1884 dbg("set_serial_baud Value to write DLL is %x\n", Data); 1885 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data); 1886 1887 Data = (unsigned char)((divisor & 0xff00) >> 8); 1888 dbg("set_serial_baud Value to write DLM is %x\n", Data); 1889 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data); 1890 1891 /* Disable access to divisor latch */ 1892 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB; 1893 mos7840_port->shadowLCR = Data; 1894 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 1895 1896 } 1897 return status; 1898 } 1899 1900 /***************************************************************************** 1901 * mos7840_change_port_settings 1902 * This routine is called to set the UART on the device to match 1903 * the specified new settings. 1904 *****************************************************************************/ 1905 1906 static void mos7840_change_port_settings(struct tty_struct *tty, 1907 struct moschip_port *mos7840_port, struct ktermios *old_termios) 1908 { 1909 int baud; 1910 unsigned cflag; 1911 unsigned iflag; 1912 __u8 lData; 1913 __u8 lParity; 1914 __u8 lStop; 1915 int status; 1916 __u16 Data; 1917 struct usb_serial_port *port; 1918 struct usb_serial *serial; 1919 1920 if (mos7840_port == NULL) 1921 return; 1922 1923 port = (struct usb_serial_port *)mos7840_port->port; 1924 1925 if (mos7840_port_paranoia_check(port, __func__)) { 1926 dbg("%s", "Invalid port \n"); 1927 return; 1928 } 1929 1930 if (mos7840_serial_paranoia_check(port->serial, __func__)) { 1931 dbg("%s", "Invalid Serial \n"); 1932 return; 1933 } 1934 1935 serial = port->serial; 1936 1937 dbg("%s - port %d", __func__, mos7840_port->port->number); 1938 1939 if (!mos7840_port->open) { 1940 dbg("%s - port not opened", __func__); 1941 return; 1942 } 1943 1944 dbg("%s", "Entering .......... \n"); 1945 1946 lData = LCR_BITS_8; 1947 lStop = LCR_STOP_1; 1948 lParity = LCR_PAR_NONE; 1949 1950 cflag = tty->termios->c_cflag; 1951 iflag = tty->termios->c_iflag; 1952 1953 /* Change the number of bits */ 1954 if (cflag & CSIZE) { 1955 switch (cflag & CSIZE) { 1956 case CS5: 1957 lData = LCR_BITS_5; 1958 break; 1959 1960 case CS6: 1961 lData = LCR_BITS_6; 1962 break; 1963 1964 case CS7: 1965 lData = LCR_BITS_7; 1966 break; 1967 default: 1968 case CS8: 1969 lData = LCR_BITS_8; 1970 break; 1971 } 1972 } 1973 /* Change the Parity bit */ 1974 if (cflag & PARENB) { 1975 if (cflag & PARODD) { 1976 lParity = LCR_PAR_ODD; 1977 dbg("%s - parity = odd", __func__); 1978 } else { 1979 lParity = LCR_PAR_EVEN; 1980 dbg("%s - parity = even", __func__); 1981 } 1982 1983 } else { 1984 dbg("%s - parity = none", __func__); 1985 } 1986 1987 if (cflag & CMSPAR) 1988 lParity = lParity | 0x20; 1989 1990 /* Change the Stop bit */ 1991 if (cflag & CSTOPB) { 1992 lStop = LCR_STOP_2; 1993 dbg("%s - stop bits = 2", __func__); 1994 } else { 1995 lStop = LCR_STOP_1; 1996 dbg("%s - stop bits = 1", __func__); 1997 } 1998 1999 /* Update the LCR with the correct value */ 2000 mos7840_port->shadowLCR &= 2001 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK); 2002 mos7840_port->shadowLCR |= (lData | lParity | lStop); 2003 2004 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x\n", 2005 mos7840_port->shadowLCR); 2006 /* Disable Interrupts */ 2007 Data = 0x00; 2008 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data); 2009 2010 Data = 0x00; 2011 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data); 2012 2013 Data = 0xcf; 2014 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data); 2015 2016 /* Send the updated LCR value to the mos7840 */ 2017 Data = mos7840_port->shadowLCR; 2018 2019 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data); 2020 2021 Data = 0x00b; 2022 mos7840_port->shadowMCR = Data; 2023 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data); 2024 Data = 0x00b; 2025 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data); 2026 2027 /* set up the MCR register and send it to the mos7840 */ 2028 2029 mos7840_port->shadowMCR = MCR_MASTER_IE; 2030 if (cflag & CBAUD) 2031 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS); 2032 2033 if (cflag & CRTSCTS) 2034 mos7840_port->shadowMCR |= (MCR_XON_ANY); 2035 else 2036 mos7840_port->shadowMCR &= ~(MCR_XON_ANY); 2037 2038 Data = mos7840_port->shadowMCR; 2039 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data); 2040 2041 /* Determine divisor based on baud rate */ 2042 baud = tty_get_baud_rate(tty); 2043 2044 if (!baud) { 2045 /* pick a default, any default... */ 2046 dbg("%s\n", "Picked default baud..."); 2047 baud = 9600; 2048 } 2049 2050 dbg("%s - baud rate = %d", __func__, baud); 2051 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud); 2052 2053 /* Enable Interrupts */ 2054 Data = 0x0c; 2055 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data); 2056 2057 if (mos7840_port->read_urb_busy == false) { 2058 mos7840_port->read_urb->dev = serial->dev; 2059 mos7840_port->read_urb_busy = true; 2060 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC); 2061 if (status) { 2062 dbg("usb_submit_urb(read bulk) failed, status = %d", 2063 status); 2064 mos7840_port->read_urb_busy = false; 2065 } 2066 } 2067 wake_up(&mos7840_port->delta_msr_wait); 2068 mos7840_port->delta_msr_cond = 1; 2069 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x\n", 2070 mos7840_port->shadowLCR); 2071 2072 return; 2073 } 2074 2075 /***************************************************************************** 2076 * mos7840_set_termios 2077 * this function is called by the tty driver when it wants to change 2078 * the termios structure 2079 *****************************************************************************/ 2080 2081 static void mos7840_set_termios(struct tty_struct *tty, 2082 struct usb_serial_port *port, 2083 struct ktermios *old_termios) 2084 { 2085 int status; 2086 unsigned int cflag; 2087 struct usb_serial *serial; 2088 struct moschip_port *mos7840_port; 2089 dbg("mos7840_set_termios: START\n"); 2090 if (mos7840_port_paranoia_check(port, __func__)) { 2091 dbg("%s", "Invalid port \n"); 2092 return; 2093 } 2094 2095 serial = port->serial; 2096 2097 if (mos7840_serial_paranoia_check(serial, __func__)) { 2098 dbg("%s", "Invalid Serial \n"); 2099 return; 2100 } 2101 2102 mos7840_port = mos7840_get_port_private(port); 2103 2104 if (mos7840_port == NULL) 2105 return; 2106 2107 if (!mos7840_port->open) { 2108 dbg("%s - port not opened", __func__); 2109 return; 2110 } 2111 2112 dbg("%s\n", "setting termios - "); 2113 2114 cflag = tty->termios->c_cflag; 2115 2116 dbg("%s - clfag %08x iflag %08x", __func__, 2117 tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag)); 2118 dbg("%s - old clfag %08x old iflag %08x", __func__, 2119 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag)); 2120 dbg("%s - port %d", __func__, port->number); 2121 2122 /* change the port settings to the new ones specified */ 2123 2124 mos7840_change_port_settings(tty, mos7840_port, old_termios); 2125 2126 if (!mos7840_port->read_urb) { 2127 dbg("%s", "URB KILLED !!!!!\n"); 2128 return; 2129 } 2130 2131 if (mos7840_port->read_urb_busy == false) { 2132 mos7840_port->read_urb->dev = serial->dev; 2133 mos7840_port->read_urb_busy = true; 2134 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC); 2135 if (status) { 2136 dbg("usb_submit_urb(read bulk) failed, status = %d", 2137 status); 2138 mos7840_port->read_urb_busy = false; 2139 } 2140 } 2141 return; 2142 } 2143 2144 /***************************************************************************** 2145 * mos7840_get_lsr_info - get line status register info 2146 * 2147 * Purpose: Let user call ioctl() to get info when the UART physically 2148 * is emptied. On bus types like RS485, the transmitter must 2149 * release the bus after transmitting. This must be done when 2150 * the transmit shift register is empty, not be done when the 2151 * transmit holding register is empty. This functionality 2152 * allows an RS485 driver to be written in user space. 2153 *****************************************************************************/ 2154 2155 static int mos7840_get_lsr_info(struct tty_struct *tty, 2156 unsigned int __user *value) 2157 { 2158 int count; 2159 unsigned int result = 0; 2160 2161 count = mos7840_chars_in_buffer(tty); 2162 if (count == 0) { 2163 dbg("%s -- Empty", __func__); 2164 result = TIOCSER_TEMT; 2165 } 2166 2167 if (copy_to_user(value, &result, sizeof(int))) 2168 return -EFAULT; 2169 return 0; 2170 } 2171 2172 /***************************************************************************** 2173 * mos7840_set_modem_info 2174 * function to set modem info 2175 *****************************************************************************/ 2176 2177 /* FIXME: Should be using the model control hooks */ 2178 2179 static int mos7840_set_modem_info(struct moschip_port *mos7840_port, 2180 unsigned int cmd, unsigned int __user *value) 2181 { 2182 unsigned int mcr; 2183 unsigned int arg; 2184 __u16 Data; 2185 int status; 2186 struct usb_serial_port *port; 2187 2188 if (mos7840_port == NULL) 2189 return -1; 2190 2191 port = (struct usb_serial_port *)mos7840_port->port; 2192 if (mos7840_port_paranoia_check(port, __func__)) { 2193 dbg("%s", "Invalid port \n"); 2194 return -1; 2195 } 2196 2197 mcr = mos7840_port->shadowMCR; 2198 2199 if (copy_from_user(&arg, value, sizeof(int))) 2200 return -EFAULT; 2201 2202 switch (cmd) { 2203 case TIOCMBIS: 2204 if (arg & TIOCM_RTS) 2205 mcr |= MCR_RTS; 2206 if (arg & TIOCM_DTR) 2207 mcr |= MCR_RTS; 2208 if (arg & TIOCM_LOOP) 2209 mcr |= MCR_LOOPBACK; 2210 break; 2211 2212 case TIOCMBIC: 2213 if (arg & TIOCM_RTS) 2214 mcr &= ~MCR_RTS; 2215 if (arg & TIOCM_DTR) 2216 mcr &= ~MCR_RTS; 2217 if (arg & TIOCM_LOOP) 2218 mcr &= ~MCR_LOOPBACK; 2219 break; 2220 2221 case TIOCMSET: 2222 /* turn off the RTS and DTR and LOOPBACK 2223 * and then only turn on what was asked to */ 2224 mcr &= ~(MCR_RTS | MCR_DTR | MCR_LOOPBACK); 2225 mcr |= ((arg & TIOCM_RTS) ? MCR_RTS : 0); 2226 mcr |= ((arg & TIOCM_DTR) ? MCR_DTR : 0); 2227 mcr |= ((arg & TIOCM_LOOP) ? MCR_LOOPBACK : 0); 2228 break; 2229 } 2230 2231 lock_kernel(); 2232 mos7840_port->shadowMCR = mcr; 2233 2234 Data = mos7840_port->shadowMCR; 2235 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data); 2236 unlock_kernel(); 2237 if (status < 0) { 2238 dbg("setting MODEM_CONTROL_REGISTER Failed\n"); 2239 return -1; 2240 } 2241 2242 return 0; 2243 } 2244 2245 /***************************************************************************** 2246 * mos7840_get_modem_info 2247 * function to get modem info 2248 *****************************************************************************/ 2249 2250 static int mos7840_get_modem_info(struct moschip_port *mos7840_port, 2251 unsigned int __user *value) 2252 { 2253 unsigned int result = 0; 2254 __u16 msr; 2255 unsigned int mcr = mos7840_port->shadowMCR; 2256 mos7840_get_uart_reg(mos7840_port->port, 2257 MODEM_STATUS_REGISTER, &msr); 2258 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */ 2259 |((mcr & MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */ 2260 |((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */ 2261 |((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0) /* 0x040 */ 2262 |((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */ 2263 |((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */ 2264 2265 dbg("%s -- %x", __func__, result); 2266 2267 if (copy_to_user(value, &result, sizeof(int))) 2268 return -EFAULT; 2269 return 0; 2270 } 2271 2272 /***************************************************************************** 2273 * mos7840_get_serial_info 2274 * function to get information about serial port 2275 *****************************************************************************/ 2276 2277 static int mos7840_get_serial_info(struct moschip_port *mos7840_port, 2278 struct serial_struct __user *retinfo) 2279 { 2280 struct serial_struct tmp; 2281 2282 if (mos7840_port == NULL) 2283 return -1; 2284 2285 if (!retinfo) 2286 return -EFAULT; 2287 2288 memset(&tmp, 0, sizeof(tmp)); 2289 2290 tmp.type = PORT_16550A; 2291 tmp.line = mos7840_port->port->serial->minor; 2292 tmp.port = mos7840_port->port->number; 2293 tmp.irq = 0; 2294 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ; 2295 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE; 2296 tmp.baud_base = 9600; 2297 tmp.close_delay = 5 * HZ; 2298 tmp.closing_wait = 30 * HZ; 2299 2300 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 2301 return -EFAULT; 2302 return 0; 2303 } 2304 2305 /***************************************************************************** 2306 * SerialIoctl 2307 * this function handles any ioctl calls to the driver 2308 *****************************************************************************/ 2309 2310 static int mos7840_ioctl(struct tty_struct *tty, struct file *file, 2311 unsigned int cmd, unsigned long arg) 2312 { 2313 struct usb_serial_port *port = tty->driver_data; 2314 void __user *argp = (void __user *)arg; 2315 struct moschip_port *mos7840_port; 2316 2317 struct async_icount cnow; 2318 struct async_icount cprev; 2319 struct serial_icounter_struct icount; 2320 int mosret = 0; 2321 2322 if (mos7840_port_paranoia_check(port, __func__)) { 2323 dbg("%s", "Invalid port \n"); 2324 return -1; 2325 } 2326 2327 mos7840_port = mos7840_get_port_private(port); 2328 2329 if (mos7840_port == NULL) 2330 return -1; 2331 2332 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd); 2333 2334 switch (cmd) { 2335 /* return number of bytes available */ 2336 2337 case TIOCSERGETLSR: 2338 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number); 2339 return mos7840_get_lsr_info(tty, argp); 2340 return 0; 2341 2342 /* FIXME: use the modem hooks and remove this */ 2343 case TIOCMBIS: 2344 case TIOCMBIC: 2345 case TIOCMSET: 2346 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __func__, 2347 port->number); 2348 mosret = 2349 mos7840_set_modem_info(mos7840_port, cmd, argp); 2350 return mosret; 2351 2352 case TIOCMGET: 2353 dbg("%s (%d) TIOCMGET", __func__, port->number); 2354 return mos7840_get_modem_info(mos7840_port, argp); 2355 2356 case TIOCGSERIAL: 2357 dbg("%s (%d) TIOCGSERIAL", __func__, port->number); 2358 return mos7840_get_serial_info(mos7840_port, argp); 2359 2360 case TIOCSSERIAL: 2361 dbg("%s (%d) TIOCSSERIAL", __func__, port->number); 2362 break; 2363 2364 case TIOCMIWAIT: 2365 dbg("%s (%d) TIOCMIWAIT", __func__, port->number); 2366 cprev = mos7840_port->icount; 2367 while (1) { 2368 /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */ 2369 mos7840_port->delta_msr_cond = 0; 2370 wait_event_interruptible(mos7840_port->delta_msr_wait, 2371 (mos7840_port-> 2372 delta_msr_cond == 1)); 2373 2374 /* see if a signal did it */ 2375 if (signal_pending(current)) 2376 return -ERESTARTSYS; 2377 cnow = mos7840_port->icount; 2378 smp_rmb(); 2379 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && 2380 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) 2381 return -EIO; /* no change => error */ 2382 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 2383 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 2384 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 2385 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { 2386 return 0; 2387 } 2388 cprev = cnow; 2389 } 2390 /* NOTREACHED */ 2391 break; 2392 2393 case TIOCGICOUNT: 2394 cnow = mos7840_port->icount; 2395 smp_rmb(); 2396 icount.cts = cnow.cts; 2397 icount.dsr = cnow.dsr; 2398 icount.rng = cnow.rng; 2399 icount.dcd = cnow.dcd; 2400 icount.rx = cnow.rx; 2401 icount.tx = cnow.tx; 2402 icount.frame = cnow.frame; 2403 icount.overrun = cnow.overrun; 2404 icount.parity = cnow.parity; 2405 icount.brk = cnow.brk; 2406 icount.buf_overrun = cnow.buf_overrun; 2407 2408 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__, 2409 port->number, icount.rx, icount.tx); 2410 if (copy_to_user(argp, &icount, sizeof(icount))) 2411 return -EFAULT; 2412 return 0; 2413 default: 2414 break; 2415 } 2416 return -ENOIOCTLCMD; 2417 } 2418 2419 static int mos7840_calc_num_ports(struct usb_serial *serial) 2420 { 2421 int mos7840_num_ports = 0; 2422 2423 dbg("numberofendpoints: %d \n", 2424 (int)serial->interface->cur_altsetting->desc.bNumEndpoints); 2425 dbg("numberofendpoints: %d \n", 2426 (int)serial->interface->altsetting->desc.bNumEndpoints); 2427 if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) { 2428 mos7840_num_ports = serial->num_ports = 2; 2429 } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) { 2430 serial->num_bulk_in = 4; 2431 serial->num_bulk_out = 4; 2432 mos7840_num_ports = serial->num_ports = 4; 2433 } 2434 2435 return mos7840_num_ports; 2436 } 2437 2438 /**************************************************************************** 2439 * mos7840_startup 2440 ****************************************************************************/ 2441 2442 static int mos7840_startup(struct usb_serial *serial) 2443 { 2444 struct moschip_port *mos7840_port; 2445 struct usb_device *dev; 2446 int i, status; 2447 2448 __u16 Data; 2449 dbg("%s \n", " mos7840_startup :entering.........."); 2450 2451 if (!serial) { 2452 dbg("%s\n", "Invalid Handler"); 2453 return -1; 2454 } 2455 2456 dev = serial->dev; 2457 2458 dbg("%s\n", "Entering..."); 2459 2460 /* we set up the pointers to the endpoints in the mos7840_open * 2461 * function, as the structures aren't created yet. */ 2462 2463 /* set up port private structures */ 2464 for (i = 0; i < serial->num_ports; ++i) { 2465 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL); 2466 if (mos7840_port == NULL) { 2467 dev_err(&dev->dev, "%s - Out of memory\n", __func__); 2468 status = -ENOMEM; 2469 i--; /* don't follow NULL pointer cleaning up */ 2470 goto error; 2471 } 2472 2473 /* Initialize all port interrupt end point to port 0 int 2474 * endpoint. Our device has only one interrupt end point 2475 * common to all port */ 2476 2477 mos7840_port->port = serial->port[i]; 2478 mos7840_set_port_private(serial->port[i], mos7840_port); 2479 spin_lock_init(&mos7840_port->pool_lock); 2480 2481 /* minor is not initialised until later by 2482 * usb-serial.c:get_free_serial() and cannot therefore be used 2483 * to index device instances */ 2484 mos7840_port->port_num = i + 1; 2485 dbg ("serial->port[i]->number = %d", serial->port[i]->number); 2486 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor); 2487 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num); 2488 dbg ("serial->minor = %d", serial->minor); 2489 2490 if (mos7840_port->port_num == 1) { 2491 mos7840_port->SpRegOffset = 0x0; 2492 mos7840_port->ControlRegOffset = 0x1; 2493 mos7840_port->DcrRegOffset = 0x4; 2494 } else if ((mos7840_port->port_num == 2) 2495 && (serial->num_ports == 4)) { 2496 mos7840_port->SpRegOffset = 0x8; 2497 mos7840_port->ControlRegOffset = 0x9; 2498 mos7840_port->DcrRegOffset = 0x16; 2499 } else if ((mos7840_port->port_num == 2) 2500 && (serial->num_ports == 2)) { 2501 mos7840_port->SpRegOffset = 0xa; 2502 mos7840_port->ControlRegOffset = 0xb; 2503 mos7840_port->DcrRegOffset = 0x19; 2504 } else if ((mos7840_port->port_num == 3) 2505 && (serial->num_ports == 4)) { 2506 mos7840_port->SpRegOffset = 0xa; 2507 mos7840_port->ControlRegOffset = 0xb; 2508 mos7840_port->DcrRegOffset = 0x19; 2509 } else if ((mos7840_port->port_num == 4) 2510 && (serial->num_ports == 4)) { 2511 mos7840_port->SpRegOffset = 0xc; 2512 mos7840_port->ControlRegOffset = 0xd; 2513 mos7840_port->DcrRegOffset = 0x1c; 2514 } 2515 mos7840_dump_serial_port(mos7840_port); 2516 mos7840_set_port_private(serial->port[i], mos7840_port); 2517 2518 /* enable rx_disable bit in control register */ 2519 status = mos7840_get_reg_sync(serial->port[i], 2520 mos7840_port->ControlRegOffset, &Data); 2521 if (status < 0) { 2522 dbg("Reading ControlReg failed status-0x%x\n", status); 2523 break; 2524 } else 2525 dbg("ControlReg Reading success val is %x, status%d\n", 2526 Data, status); 2527 Data |= 0x08; /* setting driver done bit */ 2528 Data |= 0x04; /* sp1_bit to have cts change reflect in 2529 modem status reg */ 2530 2531 /* Data |= 0x20; //rx_disable bit */ 2532 status = mos7840_set_reg_sync(serial->port[i], 2533 mos7840_port->ControlRegOffset, Data); 2534 if (status < 0) { 2535 dbg("Writing ControlReg failed(rx_disable) status-0x%x\n", status); 2536 break; 2537 } else 2538 dbg("ControlReg Writing success(rx_disable) status%d\n", 2539 status); 2540 2541 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2 2542 and 0x24 in DCR3 */ 2543 Data = 0x01; 2544 status = mos7840_set_reg_sync(serial->port[i], 2545 (__u16) (mos7840_port->DcrRegOffset + 0), Data); 2546 if (status < 0) { 2547 dbg("Writing DCR0 failed status-0x%x\n", status); 2548 break; 2549 } else 2550 dbg("DCR0 Writing success status%d\n", status); 2551 2552 Data = 0x05; 2553 status = mos7840_set_reg_sync(serial->port[i], 2554 (__u16) (mos7840_port->DcrRegOffset + 1), Data); 2555 if (status < 0) { 2556 dbg("Writing DCR1 failed status-0x%x\n", status); 2557 break; 2558 } else 2559 dbg("DCR1 Writing success status%d\n", status); 2560 2561 Data = 0x24; 2562 status = mos7840_set_reg_sync(serial->port[i], 2563 (__u16) (mos7840_port->DcrRegOffset + 2), Data); 2564 if (status < 0) { 2565 dbg("Writing DCR2 failed status-0x%x\n", status); 2566 break; 2567 } else 2568 dbg("DCR2 Writing success status%d\n", status); 2569 2570 /* write values in clkstart0x0 and clkmulti 0x20 */ 2571 Data = 0x0; 2572 status = mos7840_set_reg_sync(serial->port[i], 2573 CLK_START_VALUE_REGISTER, Data); 2574 if (status < 0) { 2575 dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status); 2576 break; 2577 } else 2578 dbg("CLK_START_VALUE_REGISTER Writing success status%d\n", status); 2579 2580 Data = 0x20; 2581 status = mos7840_set_reg_sync(serial->port[i], 2582 CLK_MULTI_REGISTER, Data); 2583 if (status < 0) { 2584 dbg("Writing CLK_MULTI_REGISTER failed status-0x%x\n", 2585 status); 2586 goto error; 2587 } else 2588 dbg("CLK_MULTI_REGISTER Writing success status%d\n", 2589 status); 2590 2591 /* write value 0x0 to scratchpad register */ 2592 Data = 0x00; 2593 status = mos7840_set_uart_reg(serial->port[i], 2594 SCRATCH_PAD_REGISTER, Data); 2595 if (status < 0) { 2596 dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", 2597 status); 2598 break; 2599 } else 2600 dbg("SCRATCH_PAD_REGISTER Writing success status%d\n", 2601 status); 2602 2603 /* Zero Length flag register */ 2604 if ((mos7840_port->port_num != 1) 2605 && (serial->num_ports == 2)) { 2606 2607 Data = 0xff; 2608 status = mos7840_set_reg_sync(serial->port[i], 2609 (__u16) (ZLP_REG1 + 2610 ((__u16)mos7840_port->port_num)), Data); 2611 dbg("ZLIP offset%x\n", 2612 (__u16) (ZLP_REG1 + 2613 ((__u16) mos7840_port->port_num))); 2614 if (status < 0) { 2615 dbg("Writing ZLP_REG%d failed status-0x%x\n", 2616 i + 2, status); 2617 break; 2618 } else 2619 dbg("ZLP_REG%d Writing success status%d\n", 2620 i + 2, status); 2621 } else { 2622 Data = 0xff; 2623 status = mos7840_set_reg_sync(serial->port[i], 2624 (__u16) (ZLP_REG1 + 2625 ((__u16)mos7840_port->port_num) - 0x1), Data); 2626 dbg("ZLIP offset%x\n", 2627 (__u16) (ZLP_REG1 + 2628 ((__u16) mos7840_port->port_num) - 0x1)); 2629 if (status < 0) { 2630 dbg("Writing ZLP_REG%d failed status-0x%x\n", 2631 i + 1, status); 2632 break; 2633 } else 2634 dbg("ZLP_REG%d Writing success status%d\n", 2635 i + 1, status); 2636 2637 } 2638 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL); 2639 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL); 2640 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest), 2641 GFP_KERNEL); 2642 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf || 2643 !mos7840_port->dr) { 2644 status = -ENOMEM; 2645 goto error; 2646 } 2647 } 2648 2649 /* Zero Length flag enable */ 2650 Data = 0x0f; 2651 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data); 2652 if (status < 0) { 2653 dbg("Writing ZLP_REG5 failed status-0x%x\n", status); 2654 goto error; 2655 } else 2656 dbg("ZLP_REG5 Writing success status%d\n", status); 2657 2658 /* setting configuration feature to one */ 2659 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 2660 (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ); 2661 return 0; 2662 error: 2663 for (/* nothing */; i >= 0; i--) { 2664 mos7840_port = mos7840_get_port_private(serial->port[i]); 2665 2666 kfree(mos7840_port->dr); 2667 kfree(mos7840_port->ctrl_buf); 2668 usb_free_urb(mos7840_port->control_urb); 2669 kfree(mos7840_port); 2670 serial->port[i] = NULL; 2671 } 2672 return status; 2673 } 2674 2675 /**************************************************************************** 2676 * mos7840_shutdown 2677 * This function is called whenever the device is removed from the usb bus. 2678 ****************************************************************************/ 2679 2680 static void mos7840_shutdown(struct usb_serial *serial) 2681 { 2682 int i; 2683 unsigned long flags; 2684 struct moschip_port *mos7840_port; 2685 dbg("%s \n", " shutdown :entering.........."); 2686 2687 if (!serial) { 2688 dbg("%s", "Invalid Handler \n"); 2689 return; 2690 } 2691 2692 /* check for the ports to be closed,close the ports and disconnect */ 2693 2694 /* free private structure allocated for serial port * 2695 * stop reads and writes on all ports */ 2696 2697 for (i = 0; i < serial->num_ports; ++i) { 2698 mos7840_port = mos7840_get_port_private(serial->port[i]); 2699 dbg ("mos7840_port %d = %p", i, mos7840_port); 2700 if (mos7840_port) { 2701 spin_lock_irqsave(&mos7840_port->pool_lock, flags); 2702 mos7840_port->zombie = 1; 2703 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags); 2704 usb_kill_urb(mos7840_port->control_urb); 2705 kfree(mos7840_port->ctrl_buf); 2706 kfree(mos7840_port->dr); 2707 kfree(mos7840_port); 2708 } 2709 mos7840_set_port_private(serial->port[i], NULL); 2710 } 2711 2712 dbg("%s\n", "Thank u :: "); 2713 2714 } 2715 2716 static struct usb_driver io_driver = { 2717 .name = "mos7840", 2718 .probe = usb_serial_probe, 2719 .disconnect = usb_serial_disconnect, 2720 .id_table = moschip_id_table_combined, 2721 .no_dynamic_id = 1, 2722 }; 2723 2724 static struct usb_serial_driver moschip7840_4port_device = { 2725 .driver = { 2726 .owner = THIS_MODULE, 2727 .name = "mos7840", 2728 }, 2729 .description = DRIVER_DESC, 2730 .usb_driver = &io_driver, 2731 .id_table = moschip_port_id_table, 2732 .num_ports = 4, 2733 .open = mos7840_open, 2734 .close = mos7840_close, 2735 .write = mos7840_write, 2736 .write_room = mos7840_write_room, 2737 .chars_in_buffer = mos7840_chars_in_buffer, 2738 .throttle = mos7840_throttle, 2739 .unthrottle = mos7840_unthrottle, 2740 .calc_num_ports = mos7840_calc_num_ports, 2741 #ifdef MCSSerialProbe 2742 .probe = mos7840_serial_probe, 2743 #endif 2744 .ioctl = mos7840_ioctl, 2745 .set_termios = mos7840_set_termios, 2746 .break_ctl = mos7840_break, 2747 .tiocmget = mos7840_tiocmget, 2748 .tiocmset = mos7840_tiocmset, 2749 .attach = mos7840_startup, 2750 .shutdown = mos7840_shutdown, 2751 .read_bulk_callback = mos7840_bulk_in_callback, 2752 .read_int_callback = mos7840_interrupt_callback, 2753 }; 2754 2755 /**************************************************************************** 2756 * moschip7840_init 2757 * This is called by the module subsystem, or on startup to initialize us 2758 ****************************************************************************/ 2759 static int __init moschip7840_init(void) 2760 { 2761 int retval; 2762 2763 dbg("%s \n", " mos7840_init :entering.........."); 2764 2765 /* Register with the usb serial */ 2766 retval = usb_serial_register(&moschip7840_4port_device); 2767 2768 if (retval) 2769 goto failed_port_device_register; 2770 2771 dbg("%s\n", "Entring..."); 2772 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":" 2773 DRIVER_DESC "\n"); 2774 2775 /* Register with the usb */ 2776 retval = usb_register(&io_driver); 2777 if (retval == 0) { 2778 dbg("%s\n", "Leaving..."); 2779 return 0; 2780 } 2781 usb_serial_deregister(&moschip7840_4port_device); 2782 failed_port_device_register: 2783 return retval; 2784 } 2785 2786 /**************************************************************************** 2787 * moschip7840_exit 2788 * Called when the driver is about to be unloaded. 2789 ****************************************************************************/ 2790 static void __exit moschip7840_exit(void) 2791 { 2792 2793 dbg("%s \n", " mos7840_exit :entering.........."); 2794 2795 usb_deregister(&io_driver); 2796 2797 usb_serial_deregister(&moschip7840_4port_device); 2798 2799 dbg("%s\n", "Entring..."); 2800 } 2801 2802 module_init(moschip7840_init); 2803 module_exit(moschip7840_exit); 2804 2805 /* Module information */ 2806 MODULE_DESCRIPTION(DRIVER_DESC); 2807 MODULE_LICENSE("GPL"); 2808 2809 module_param(debug, bool, S_IRUGO | S_IWUSR); 2810 MODULE_PARM_DESC(debug, "Debug enabled or not"); 2811