drivers/usb/serial/mos7840.c

   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/smp_lock.h>
  30 #include <linux/tty.h>
  31 #include <linux/tty_driver.h>
  32 #include <linux/tty_flip.h>
  33 #include <linux/module.h>
  34 #include <linux/serial.h>
  35 #include <linux/usb.h>
  36 #include <linux/usb/serial.h>
  37 #include <linux/uaccess.h>
  38
  39 /*
  40  * Version Information
  41  */
  42 #define DRIVER_VERSION "1.3.2"
  43 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
  44
  45 /*
  46  * 16C50 UART register defines
  47  */
  48
  49 #define LCR_BITS_5             0x00     /* 5 bits/char */
  50 #define LCR_BITS_6             0x01     /* 6 bits/char */
  51 #define LCR_BITS_7             0x02     /* 7 bits/char */
  52 #define LCR_BITS_8             0x03     /* 8 bits/char */
  53 #define LCR_BITS_MASK          0x03     /* Mask for bits/char field */
  54
  55 #define LCR_STOP_1             0x00     /* 1 stop bit */
  56 #define LCR_STOP_1_5           0x04     /* 1.5 stop bits (if 5   bits/char) */
  57 #define LCR_STOP_2             0x04     /* 2 stop bits   (if 6-8 bits/char) */
  58 #define LCR_STOP_MASK          0x04     /* Mask for stop bits field */
  59
  60 #define LCR_PAR_NONE           0x00     /* No parity */
  61 #define LCR_PAR_ODD            0x08     /* Odd parity */
  62 #define LCR_PAR_EVEN           0x18     /* Even parity */
  63 #define LCR_PAR_MARK           0x28     /* Force parity bit to 1 */
  64 #define LCR_PAR_SPACE          0x38     /* Force parity bit to 0 */
  65 #define LCR_PAR_MASK           0x38     /* Mask for parity field */
  66
  67 #define LCR_SET_BREAK          0x40     /* Set Break condition */
  68 #define LCR_DL_ENABLE          0x80     /* Enable access to divisor latch */
  69
  70 #define MCR_DTR                0x01     /* Assert DTR */
  71 #define MCR_RTS                0x02     /* Assert RTS */
  72 #define MCR_OUT1               0x04     /* Loopback only: Sets state of RI */
  73 #define MCR_MASTER_IE          0x08     /* Enable interrupt outputs */
  74 #define MCR_LOOPBACK           0x10     /* Set internal (digital) loopback mode */
  75 #define MCR_XON_ANY            0x20     /* Enable any char to exit XOFF mode */
  76
  77 #define MOS7840_MSR_CTS        0x10     /* Current state of CTS */
  78 #define MOS7840_MSR_DSR        0x20     /* Current state of DSR */
  79 #define MOS7840_MSR_RI         0x40     /* Current state of RI */
  80 #define MOS7840_MSR_CD         0x80     /* Current state of CD */
  81
  82 /*
  83  * Defines used for sending commands to port
  84  */
  85
  86 #define WAIT_FOR_EVER   (HZ * 0)        /* timeout urb is wait for ever */
  87 #define MOS_WDR_TIMEOUT (HZ * 5)        /* default urb timeout */
  88
  89 #define MOS_PORT1       0x0200
  90 #define MOS_PORT2       0x0300
  91 #define MOS_VENREG      0x0000
  92 #define MOS_MAX_PORT    0x02
  93 #define MOS_WRITE       0x0E
  94 #define MOS_READ        0x0D
  95
  96 /* Requests */
  97 #define MCS_RD_RTYPE    0xC0
  98 #define MCS_WR_RTYPE    0x40
  99 #define MCS_RDREQ       0x0D
 100 #define MCS_WRREQ       0x0E
 101 #define MCS_CTRL_TIMEOUT        500
 102 #define VENDOR_READ_LENGTH      (0x01)
 103
 104 #define MAX_NAME_LEN    64
 105
 106 #define ZLP_REG1  0x3A          /* Zero_Flag_Reg1    58 */
 107 #define ZLP_REG5  0x3E          /* Zero_Flag_Reg5    62 */
 108
 109 /* For higher baud Rates use TIOCEXBAUD */
 110 #define TIOCEXBAUD     0x5462
 111
 112 /* vendor id and device id defines */
 113
 114 /* The native mos7840/7820 component */
 115 #define USB_VENDOR_ID_MOSCHIP           0x9710
 116 #define MOSCHIP_DEVICE_ID_7840          0x7840
 117 #define MOSCHIP_DEVICE_ID_7820          0x7820
 118 /* The native component can have its vendor/device id's overridden
 119  * in vendor-specific implementations.  Such devices can be handled
 120  * by making a change here, in moschip_port_id_table, and in
 121  * moschip_id_table_combined
 122  */
 123 #define USB_VENDOR_ID_BANDB             0x0856
 124 #define BANDB_DEVICE_ID_USO9ML2_2       0xAC22
 125 #define BANDB_DEVICE_ID_USO9ML2_4       0xAC24
 126 #define BANDB_DEVICE_ID_US9ML2_2        0xAC29
 127 #define BANDB_DEVICE_ID_US9ML2_4        0xAC30
 128 #define BANDB_DEVICE_ID_USPTL4_2        0xAC31
 129 #define BANDB_DEVICE_ID_USPTL4_4        0xAC32
 130 #define BANDB_DEVICE_ID_USOPTL4_2       0xAC42
 131 #define BANDB_DEVICE_ID_USOPTL4_4       0xAC44
 132 #define BANDB_DEVICE_ID_USOPTL2_4       0xAC24
 133
 134 /* This driver also supports
 135  * ATEN UC2324 device using Moschip MCS7840
 136  * ATEN UC2322 device using Moschip MCS7820
 137  */
 138 #define USB_VENDOR_ID_ATENINTL          0x0557
 139 #define ATENINTL_DEVICE_ID_UC2324       0x2011
 140 #define ATENINTL_DEVICE_ID_UC2322       0x7820
 141
 142 /* Interrupt Routine Defines    */
 143
 144 #define SERIAL_IIR_RLS      0x06
 145 #define SERIAL_IIR_MS       0x00
 146
 147 /*
 148  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 149  */
 150 #define SERIAL_LSR_DR       0x0001
 151 #define SERIAL_LSR_OE       0x0002
 152 #define SERIAL_LSR_PE       0x0004
 153 #define SERIAL_LSR_FE       0x0008
 154 #define SERIAL_LSR_BI       0x0010
 155
 156 #define MOS_MSR_DELTA_CTS   0x10
 157 #define MOS_MSR_DELTA_DSR   0x20
 158 #define MOS_MSR_DELTA_RI    0x40
 159 #define MOS_MSR_DELTA_CD    0x80
 160
 161 /* Serial Port register Address */
 162 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 163 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 164 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 165 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 166 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 167 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 168 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 169 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 170 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 171
 172 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 173 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 174
 175 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 176
 177 /*
 178  * URB POOL related defines
 179  */
 180 #define NUM_URBS                        16      /* URB Count */
 181 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 182
 183
 184 static const struct usb_device_id moschip_port_id_table[] = {
 185         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 186         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 187         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
 188         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 189         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 190         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 191         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 192         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 193         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 194         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 195         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
 196         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 197         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 198         {}                      /* terminating entry */
 199 };
 200
 201 static const struct usb_device_id moschip_id_table_combined[] __devinitconst = {
 202         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 203         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 204         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
 205         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 206         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 207         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 208         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 209         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 210         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 211         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 212         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
 213         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 214         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 215         {}                      /* terminating entry */
 216 };
 217
 218 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
 219
 220 /* This structure holds all of the local port information */
 221
 222 struct moschip_port {
 223         int port_num;           /*Actual port number in the device(1,2,etc) */
 224         struct urb *write_urb;  /* write URB for this port */
 225         struct urb *read_urb;   /* read URB for this port */
 226         struct urb *int_urb;
 227         __u8 shadowLCR;         /* last LCR value received */
 228         __u8 shadowMCR;         /* last MCR value received */
 229         char open;
 230         char open_ports;
 231         char zombie;
 232         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 233         wait_queue_head_t delta_msr_wait;       /* for handling sleeping while waiting for msr change to happen */
 234         int delta_msr_cond;
 235         struct async_icount icount;
 236         struct usb_serial_port *port;   /* loop back to the owner of this object */
 237
 238         /* Offsets */
 239         __u8 SpRegOffset;
 240         __u8 ControlRegOffset;
 241         __u8 DcrRegOffset;
 242         /* for processing control URBS in interrupt context */
 243         struct urb *control_urb;
 244         struct usb_ctrlrequest *dr;
 245         char *ctrl_buf;
 246         int MsrLsr;
 247
 248         spinlock_t pool_lock;
 249         struct urb *write_urb_pool[NUM_URBS];
 250         char busy[NUM_URBS];
 251         bool read_urb_busy;
 252 };
 253
 254
 255 static int debug;
 256
 257 /*
 258  * mos7840_set_reg_sync
 259  *      To set the Control register by calling usb_fill_control_urb function
 260  *      by passing usb_sndctrlpipe function as parameter.
 261  */
 262
 263 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 264                                 __u16 val)
 265 {
 266         struct usb_device *dev = port->serial->dev;
 267         val = val & 0x00ff;
 268         dbg("mos7840_set_reg_sync offset is %x, value %x", reg, val);
 269
 270         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 271                                MCS_WR_RTYPE, val, reg, NULL, 0,
 272                                MOS_WDR_TIMEOUT);
 273 }
 274
 275 /*
 276  * mos7840_get_reg_sync
 277  *      To set the Uart register by calling usb_fill_control_urb function by
 278  *      passing usb_rcvctrlpipe function as parameter.
 279  */
 280
 281 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 282                                 __u16 *val)
 283 {
 284         struct usb_device *dev = port->serial->dev;
 285         int ret = 0;
 286         u8 *buf;
 287
 288         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 289         if (!buf)
 290                 return -ENOMEM;
 291
 292         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 293                               MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
 294                               MOS_WDR_TIMEOUT);
 295         *val = buf[0];
 296         dbg("mos7840_get_reg_sync offset is %x, return val %x", reg, *val);
 297
 298         kfree(buf);
 299         return ret;
 300 }
 301
 302 /*
 303  * mos7840_set_uart_reg
 304  *      To set the Uart register by calling usb_fill_control_urb function by
 305  *      passing usb_sndctrlpipe function as parameter.
 306  */
 307
 308 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 309                                 __u16 val)
 310 {
 311
 312         struct usb_device *dev = port->serial->dev;
 313         val = val & 0x00ff;
 314         /* For the UART control registers, the application number need
 315            to be Or'ed */
 316         if (port->serial->num_ports == 4) {
 317                 val |= (((__u16) port->number -
 318                                 (__u16) (port->serial->minor)) + 1) << 8;
 319                 dbg("mos7840_set_uart_reg application number is %x", val);
 320         } else {
 321                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 322                         val |= (((__u16) port->number -
 323                               (__u16) (port->serial->minor)) + 1) << 8;
 324                         dbg("mos7840_set_uart_reg application number is %x",
 325                             val);
 326                 } else {
 327                         val |=
 328                             (((__u16) port->number -
 329                               (__u16) (port->serial->minor)) + 2) << 8;
 330                         dbg("mos7840_set_uart_reg application number is %x",
 331                             val);
 332                 }
 333         }
 334         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 335                                MCS_WR_RTYPE, val, reg, NULL, 0,
 336                                MOS_WDR_TIMEOUT);
 337
 338 }
 339
 340 /*
 341  * mos7840_get_uart_reg
 342  *      To set the Control register by calling usb_fill_control_urb function
 343  *      by passing usb_rcvctrlpipe function as parameter.
 344  */
 345 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 346                                 __u16 *val)
 347 {
 348         struct usb_device *dev = port->serial->dev;
 349         int ret = 0;
 350         __u16 Wval;
 351         u8 *buf;
 352
 353         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 354         if (!buf)
 355                 return -ENOMEM;
 356
 357         /* dbg("application number is %4x",
 358             (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
 359         /* Wval  is same as application number */
 360         if (port->serial->num_ports == 4) {
 361                 Wval =
 362                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 363                      1) << 8;
 364                 dbg("mos7840_get_uart_reg application number is %x", Wval);
 365         } else {
 366                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 367                         Wval = (((__u16) port->number -
 368                               (__u16) (port->serial->minor)) + 1) << 8;
 369                         dbg("mos7840_get_uart_reg application number is %x",
 370                             Wval);
 371                 } else {
 372                         Wval = (((__u16) port->number -
 373                               (__u16) (port->serial->minor)) + 2) << 8;
 374                         dbg("mos7840_get_uart_reg application number is %x",
 375                             Wval);
 376                 }
 377         }
 378         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 379                               MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
 380                               MOS_WDR_TIMEOUT);
 381         *val = buf[0];
 382
 383         kfree(buf);
 384         return ret;
 385 }
 386
 387 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
 388 {
 389
 390         dbg("***************************************");
 391         dbg("SpRegOffset is %2x", mos7840_port->SpRegOffset);
 392         dbg("ControlRegOffset is %2x", mos7840_port->ControlRegOffset);
 393         dbg("DCRRegOffset is %2x", mos7840_port->DcrRegOffset);
 394         dbg("***************************************");
 395
 396 }
 397
 398 /************************************************************************/
 399 /************************************************************************/
 400 /*             I N T E R F A C E   F U N C T I O N S                    */
 401 /*             I N T E R F A C E   F U N C T I O N S                    */
 402 /************************************************************************/
 403 /************************************************************************/
 404
 405 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 406                                             struct moschip_port *data)
 407 {
 408         usb_set_serial_port_data(port, (void *)data);
 409 }
 410
 411 static inline struct moschip_port *mos7840_get_port_private(struct
 412                                                             usb_serial_port
 413                                                             *port)
 414 {
 415         return (struct moschip_port *)usb_get_serial_port_data(port);
 416 }
 417
 418 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 419 {
 420         struct moschip_port *mos7840_port;
 421         struct async_icount *icount;
 422         mos7840_port = port;
 423         icount = &mos7840_port->icount;
 424         if (new_msr &
 425             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 426              MOS_MSR_DELTA_CD)) {
 427                 icount = &mos7840_port->icount;
 428
 429                 /* update input line counters */
 430                 if (new_msr & MOS_MSR_DELTA_CTS) {
 431                         icount->cts++;
 432                         smp_wmb();
 433                 }
 434                 if (new_msr & MOS_MSR_DELTA_DSR) {
 435                         icount->dsr++;
 436                         smp_wmb();
 437                 }
 438                 if (new_msr & MOS_MSR_DELTA_CD) {
 439                         icount->dcd++;
 440                         smp_wmb();
 441                 }
 442                 if (new_msr & MOS_MSR_DELTA_RI) {
 443                         icount->rng++;
 444                         smp_wmb();
 445                 }
 446         }
 447 }
 448
 449 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 450 {
 451         struct async_icount *icount;
 452
 453         dbg("%s - %02x", __func__, new_lsr);
 454
 455         if (new_lsr & SERIAL_LSR_BI) {
 456                 /*
 457                  * Parity and Framing errors only count if they
 458                  * occur exclusive of a break being
 459                  * received.
 460                  */
 461                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 462         }
 463
 464         /* update input line counters */
 465         icount = &port->icount;
 466         if (new_lsr & SERIAL_LSR_BI) {
 467                 icount->brk++;
 468                 smp_wmb();
 469         }
 470         if (new_lsr & SERIAL_LSR_OE) {
 471                 icount->overrun++;
 472                 smp_wmb();
 473         }
 474         if (new_lsr & SERIAL_LSR_PE) {
 475                 icount->parity++;
 476                 smp_wmb();
 477         }
 478         if (new_lsr & SERIAL_LSR_FE) {
 479                 icount->frame++;
 480                 smp_wmb();
 481         }
 482 }
 483
 484 /************************************************************************/
 485 /************************************************************************/
 486 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 487 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 488 /************************************************************************/
 489 /************************************************************************/
 490
 491 static void mos7840_control_callback(struct urb *urb)
 492 {
 493         unsigned char *data;
 494         struct moschip_port *mos7840_port;
 495         __u8 regval = 0x0;
 496         int result = 0;
 497         int status = urb->status;
 498
 499         mos7840_port = urb->context;
 500
 501         switch (status) {
 502         case 0:
 503                 /* success */
 504                 break;
 505         case -ECONNRESET:
 506         case -ENOENT:
 507         case -ESHUTDOWN:
 508                 /* this urb is terminated, clean up */
 509                 dbg("%s - urb shutting down with status: %d", __func__,
 510                     status);
 511                 return;
 512         default:
 513                 dbg("%s - nonzero urb status received: %d", __func__,
 514                     status);
 515                 goto exit;
 516         }
 517
 518         dbg("%s urb buffer size is %d", __func__, urb->actual_length);
 519         dbg("%s mos7840_port->MsrLsr is %d port %d", __func__,
 520             mos7840_port->MsrLsr, mos7840_port->port_num);
 521         data = urb->transfer_buffer;
 522         regval = (__u8) data[0];
 523         dbg("%s data is %x", __func__, regval);
 524         if (mos7840_port->MsrLsr == 0)
 525                 mos7840_handle_new_msr(mos7840_port, regval);
 526         else if (mos7840_port->MsrLsr == 1)
 527                 mos7840_handle_new_lsr(mos7840_port, regval);
 528
 529 exit:
 530         spin_lock(&mos7840_port->pool_lock);
 531         if (!mos7840_port->zombie)
 532                 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
 533         spin_unlock(&mos7840_port->pool_lock);
 534         if (result) {
 535                 dev_err(&urb->dev->dev,
 536                         "%s - Error %d submitting interrupt urb\n",
 537                         __func__, result);
 538         }
 539 }
 540
 541 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 542                            __u16 *val)
 543 {
 544         struct usb_device *dev = mcs->port->serial->dev;
 545         struct usb_ctrlrequest *dr = mcs->dr;
 546         unsigned char *buffer = mcs->ctrl_buf;
 547         int ret;
 548
 549         dr->bRequestType = MCS_RD_RTYPE;
 550         dr->bRequest = MCS_RDREQ;
 551         dr->wValue = cpu_to_le16(Wval); /* 0 */
 552         dr->wIndex = cpu_to_le16(reg);
 553         dr->wLength = cpu_to_le16(2);
 554
 555         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 556                              (unsigned char *)dr, buffer, 2,
 557                              mos7840_control_callback, mcs);
 558         mcs->control_urb->transfer_buffer_length = 2;
 559         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 560         return ret;
 561 }
 562
 563 /*****************************************************************************
 564  * mos7840_interrupt_callback
 565  *      this is the callback function for when we have received data on the
 566  *      interrupt endpoint.
 567  *****************************************************************************/
 568
 569 static void mos7840_interrupt_callback(struct urb *urb)
 570 {
 571         int result;
 572         int length;
 573         struct moschip_port *mos7840_port;
 574         struct usb_serial *serial;
 575         __u16 Data;
 576         unsigned char *data;
 577         __u8 sp[5], st;
 578         int i, rv = 0;
 579         __u16 wval, wreg = 0;
 580         int status = urb->status;
 581
 582         dbg("%s", " : Entering");
 583
 584         switch (status) {
 585         case 0:
 586                 /* success */
 587                 break;
 588         case -ECONNRESET:
 589         case -ENOENT:
 590         case -ESHUTDOWN:
 591                 /* this urb is terminated, clean up */
 592                 dbg("%s - urb shutting down with status: %d", __func__,
 593                     status);
 594                 return;
 595         default:
 596                 dbg("%s - nonzero urb status received: %d", __func__,
 597                     status);
 598                 goto exit;
 599         }
 600
 601         length = urb->actual_length;
 602         data = urb->transfer_buffer;
 603
 604         serial = urb->context;
 605
 606         /* Moschip get 5 bytes
 607          * Byte 1 IIR Port 1 (port.number is 0)
 608          * Byte 2 IIR Port 2 (port.number is 1)
 609          * Byte 3 IIR Port 3 (port.number is 2)
 610          * Byte 4 IIR Port 4 (port.number is 3)
 611          * Byte 5 FIFO status for both */
 612
 613         if (length && length > 5) {
 614                 dbg("%s", "Wrong data !!!");
 615                 return;
 616         }
 617
 618         sp[0] = (__u8) data[0];
 619         sp[1] = (__u8) data[1];
 620         sp[2] = (__u8) data[2];
 621         sp[3] = (__u8) data[3];
 622         st = (__u8) data[4];
 623
 624         for (i = 0; i < serial->num_ports; i++) {
 625                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 626                 wval =
 627                     (((__u16) serial->port[i]->number -
 628                       (__u16) (serial->minor)) + 1) << 8;
 629                 if (mos7840_port->open) {
 630                         if (sp[i] & 0x01) {
 631                                 dbg("SP%d No Interrupt !!!", i);
 632                         } else {
 633                                 switch (sp[i] & 0x0f) {
 634                                 case SERIAL_IIR_RLS:
 635                                         dbg("Serial Port %d: Receiver status error or ", i);
 636                                         dbg("address bit detected in 9-bit mode");
 637                                         mos7840_port->MsrLsr = 1;
 638                                         wreg = LINE_STATUS_REGISTER;
 639                                         break;
 640                                 case SERIAL_IIR_MS:
 641                                         dbg("Serial Port %d: Modem status change", i);
 642                                         mos7840_port->MsrLsr = 0;
 643                                         wreg = MODEM_STATUS_REGISTER;
 644                                         break;
 645                                 }
 646                                 spin_lock(&mos7840_port->pool_lock);
 647                                 if (!mos7840_port->zombie) {
 648                                         rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 649                                 } else {
 650                                         spin_unlock(&mos7840_port->pool_lock);
 651                                         return;
 652                                 }
 653                                 spin_unlock(&mos7840_port->pool_lock);
 654                         }
 655                 }
 656         }
 657         if (!(rv < 0))
 658                 /* the completion handler for the control urb will resubmit */
 659                 return;
 660 exit:
 661         result = usb_submit_urb(urb, GFP_ATOMIC);
 662         if (result) {
 663                 dev_err(&urb->dev->dev,
 664                         "%s - Error %d submitting interrupt urb\n",
 665                         __func__, result);
 666         }
 667 }
 668
 669 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 670                                        const char *function)
 671 {
 672         if (!port) {
 673                 dbg("%s - port == NULL", function);
 674                 return -1;
 675         }
 676         if (!port->serial) {
 677                 dbg("%s - port->serial == NULL", function);
 678                 return -1;
 679         }
 680
 681         return 0;
 682 }
 683
 684 /* Inline functions to check the sanity of a pointer that is passed to us */
 685 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 686                                          const char *function)
 687 {
 688         if (!serial) {
 689                 dbg("%s - serial == NULL", function);
 690                 return -1;
 691         }
 692         if (!serial->type) {
 693                 dbg("%s - serial->type == NULL!", function);
 694                 return -1;
 695         }
 696
 697         return 0;
 698 }
 699
 700 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 701                                                  const char *function)
 702 {
 703         /* if no port was specified, or it fails a paranoia check */
 704         if (!port ||
 705             mos7840_port_paranoia_check(port, function) ||
 706             mos7840_serial_paranoia_check(port->serial, function)) {
 707                 /* then say that we don't have a valid usb_serial thing,
 708                  * which will end up genrating -ENODEV return values */
 709                 return NULL;
 710         }
 711
 712         return port->serial;
 713 }
 714
 715 /*****************************************************************************
 716  * mos7840_bulk_in_callback
 717  *      this is the callback function for when we have received data on the
 718  *      bulk in endpoint.
 719  *****************************************************************************/
 720
 721 static void mos7840_bulk_in_callback(struct urb *urb)
 722 {
 723         int retval;
 724         unsigned char *data;
 725         struct usb_serial *serial;
 726         struct usb_serial_port *port;
 727         struct moschip_port *mos7840_port;
 728         struct tty_struct *tty;
 729         int status = urb->status;
 730
 731         mos7840_port = urb->context;
 732         if (!mos7840_port) {
 733                 dbg("%s", "NULL mos7840_port pointer");
 734                 mos7840_port->read_urb_busy = false;
 735                 return;
 736         }
 737
 738         if (status) {
 739                 dbg("nonzero read bulk status received: %d", status);
 740                 mos7840_port->read_urb_busy = false;
 741                 return;
 742         }
 743
 744         port = (struct usb_serial_port *)mos7840_port->port;
 745         if (mos7840_port_paranoia_check(port, __func__)) {
 746                 dbg("%s", "Port Paranoia failed");
 747                 mos7840_port->read_urb_busy = false;
 748                 return;
 749         }
 750
 751         serial = mos7840_get_usb_serial(port, __func__);
 752         if (!serial) {
 753                 dbg("%s", "Bad serial pointer");
 754                 mos7840_port->read_urb_busy = false;
 755                 return;
 756         }
 757
 758         dbg("%s", "Entering... ");
 759
 760         data = urb->transfer_buffer;
 761
 762         dbg("%s", "Entering ...........");
 763
 764         if (urb->actual_length) {
 765                 tty = tty_port_tty_get(&mos7840_port->port->port);
 766                 if (tty) {
 767                         tty_buffer_request_room(tty, urb->actual_length);
 768                         tty_insert_flip_string(tty, data, urb->actual_length);
 769                         dbg(" %s ", data);
 770                         tty_flip_buffer_push(tty);
 771                         tty_kref_put(tty);
 772                 }
 773                 mos7840_port->icount.rx += urb->actual_length;
 774                 smp_wmb();
 775                 dbg("mos7840_port->icount.rx is %d:",
 776                     mos7840_port->icount.rx);
 777         }
 778
 779         if (!mos7840_port->read_urb) {
 780                 dbg("%s", "URB KILLED !!!");
 781                 mos7840_port->read_urb_busy = false;
 782                 return;
 783         }
 784
 785
 786         mos7840_port->read_urb->dev = serial->dev;
 787
 788         mos7840_port->read_urb_busy = true;
 789         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 790
 791         if (retval) {
 792                 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
 793                 mos7840_port->read_urb_busy = false;
 794         }
 795 }
 796
 797 /*****************************************************************************
 798  * mos7840_bulk_out_data_callback
 799  *      this is the callback function for when we have finished sending
 800  *      serial data on the bulk out endpoint.
 801  *****************************************************************************/
 802
 803 static void mos7840_bulk_out_data_callback(struct urb *urb)
 804 {
 805         struct moschip_port *mos7840_port;
 806         struct tty_struct *tty;
 807         int status = urb->status;
 808         int i;
 809
 810         mos7840_port = urb->context;
 811         spin_lock(&mos7840_port->pool_lock);
 812         for (i = 0; i < NUM_URBS; i++) {
 813                 if (urb == mos7840_port->write_urb_pool[i]) {
 814                         mos7840_port->busy[i] = 0;
 815                         break;
 816                 }
 817         }
 818         spin_unlock(&mos7840_port->pool_lock);
 819
 820         if (status) {
 821                 dbg("nonzero write bulk status received:%d", status);
 822                 return;
 823         }
 824
 825         if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
 826                 dbg("%s", "Port Paranoia failed");
 827                 return;
 828         }
 829
 830         dbg("%s", "Entering .........");
 831
 832         tty = tty_port_tty_get(&mos7840_port->port->port);
 833         if (tty && mos7840_port->open)
 834                 tty_wakeup(tty);
 835         tty_kref_put(tty);
 836
 837 }
 838
 839 /************************************************************************/
 840 /*       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       */
 841 /************************************************************************/
 842 #ifdef MCSSerialProbe
 843 static int mos7840_serial_probe(struct usb_serial *serial,
 844                                 const struct usb_device_id *id)
 845 {
 846
 847         /*need to implement the mode_reg reading and updating\
 848            structures usb_serial_ device_type\
 849            (i.e num_ports, num_bulkin,bulkout etc) */
 850         /* Also we can update the changes  attach */
 851         return 1;
 852 }
 853 #endif
 854
 855 /*****************************************************************************
 856  * mos7840_open
 857  *      this function is called by the tty driver when a port is opened
 858  *      If successful, we return 0
 859  *      Otherwise we return a negative error number.
 860  *****************************************************************************/
 861
 862 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
 863 {
 864         int response;
 865         int j;
 866         struct usb_serial *serial;
 867         struct urb *urb;
 868         __u16 Data;
 869         int status;
 870         struct moschip_port *mos7840_port;
 871         struct moschip_port *port0;
 872
 873         dbg ("%s enter", __func__);
 874
 875         if (mos7840_port_paranoia_check(port, __func__)) {
 876                 dbg("%s", "Port Paranoia failed");
 877                 return -ENODEV;
 878         }
 879
 880         serial = port->serial;
 881
 882         if (mos7840_serial_paranoia_check(serial, __func__)) {
 883                 dbg("%s", "Serial Paranoia failed");
 884                 return -ENODEV;
 885         }
 886
 887         mos7840_port = mos7840_get_port_private(port);
 888         port0 = mos7840_get_port_private(serial->port[0]);
 889
 890         if (mos7840_port == NULL || port0 == NULL)
 891                 return -ENODEV;
 892
 893         usb_clear_halt(serial->dev, port->write_urb->pipe);
 894         usb_clear_halt(serial->dev, port->read_urb->pipe);
 895         port0->open_ports++;
 896
 897         /* Initialising the write urb pool */
 898         for (j = 0; j < NUM_URBS; ++j) {
 899                 urb = usb_alloc_urb(0, GFP_KERNEL);
 900                 mos7840_port->write_urb_pool[j] = urb;
 901
 902                 if (urb == NULL) {
 903                         dev_err(&port->dev, "No more urbs???\n");
 904                         continue;
 905                 }
 906
 907                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 908                                                                 GFP_KERNEL);
 909                 if (!urb->transfer_buffer) {
 910                         usb_free_urb(urb);
 911                         mos7840_port->write_urb_pool[j] = NULL;
 912                         dev_err(&port->dev,
 913                                 "%s-out of memory for urb buffers.\n",
 914                                 __func__);
 915                         continue;
 916                 }
 917         }
 918
 919 /*****************************************************************************
 920  * Initialize MCS7840 -- Write Init values to corresponding Registers
 921  *
 922  * Register Index
 923  * 1 : IER
 924  * 2 : FCR
 925  * 3 : LCR
 926  * 4 : MCR
 927  *
 928  * 0x08 : SP1/2 Control Reg
 929  *****************************************************************************/
 930
 931         /* NEED to check the following Block */
 932
 933         Data = 0x0;
 934         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 935         if (status < 0) {
 936                 dbg("Reading Spreg failed");
 937                 return -1;
 938         }
 939         Data |= 0x80;
 940         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 941         if (status < 0) {
 942                 dbg("writing Spreg failed");
 943                 return -1;
 944         }
 945
 946         Data &= ~0x80;
 947         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 948         if (status < 0) {
 949                 dbg("writing Spreg failed");
 950                 return -1;
 951         }
 952         /* End of block to be checked */
 953
 954         Data = 0x0;
 955         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 956                                                                         &Data);
 957         if (status < 0) {
 958                 dbg("Reading Controlreg failed");
 959                 return -1;
 960         }
 961         Data |= 0x08;           /* Driver done bit */
 962         Data |= 0x20;           /* rx_disable */
 963         status = mos7840_set_reg_sync(port,
 964                                 mos7840_port->ControlRegOffset, Data);
 965         if (status < 0) {
 966                 dbg("writing Controlreg failed");
 967                 return -1;
 968         }
 969         /* do register settings here */
 970         /* Set all regs to the device default values. */
 971         /***********************************
 972          * First Disable all interrupts.
 973          ***********************************/
 974         Data = 0x00;
 975         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 976         if (status < 0) {
 977                 dbg("disabling interrupts failed");
 978                 return -1;
 979         }
 980         /* Set FIFO_CONTROL_REGISTER to the default value */
 981         Data = 0x00;
 982         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 983         if (status < 0) {
 984                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
 985                 return -1;
 986         }
 987
 988         Data = 0xcf;
 989         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 990         if (status < 0) {
 991                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
 992                 return -1;
 993         }
 994
 995         Data = 0x03;
 996         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 997         mos7840_port->shadowLCR = Data;
 998
 999         Data = 0x0b;
1000         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1001         mos7840_port->shadowMCR = Data;
1002
1003         Data = 0x00;
1004         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1005         mos7840_port->shadowLCR = Data;
1006
1007         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1008         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1009
1010         Data = 0x0c;
1011         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1012
1013         Data = 0x0;
1014         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1015
1016         Data = 0x00;
1017         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1018
1019         Data = Data & ~SERIAL_LCR_DLAB;
1020         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1021         mos7840_port->shadowLCR = Data;
1022
1023         /* clearing Bulkin and Bulkout Fifo */
1024         Data = 0x0;
1025         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1026
1027         Data = Data | 0x0c;
1028         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1029
1030         Data = Data & ~0x0c;
1031         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1032         /* Finally enable all interrupts */
1033         Data = 0x0c;
1034         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1035
1036         /* clearing rx_disable */
1037         Data = 0x0;
1038         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1039                                                                         &Data);
1040         Data = Data & ~0x20;
1041         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1042                                                                         Data);
1043
1044         /* rx_negate */
1045         Data = 0x0;
1046         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1047                                                                         &Data);
1048         Data = Data | 0x10;
1049         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1050                                                                         Data);
1051
1052         /* Check to see if we've set up our endpoint info yet    *
1053          * (can't set it up in mos7840_startup as the structures *
1054          * were not set up at that time.)                        */
1055         if (port0->open_ports == 1) {
1056                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1057                         /* set up interrupt urb */
1058                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1059                                 serial->dev,
1060                                 usb_rcvintpipe(serial->dev,
1061                                 serial->port[0]->interrupt_in_endpointAddress),
1062                                 serial->port[0]->interrupt_in_buffer,
1063                                 serial->port[0]->interrupt_in_urb->
1064                                 transfer_buffer_length,
1065                                 mos7840_interrupt_callback,
1066                                 serial,
1067                                 serial->port[0]->interrupt_in_urb->interval);
1068
1069                         /* start interrupt read for mos7840               *
1070                          * will continue as long as mos7840 is connected  */
1071
1072                         response =
1073                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1074                                            GFP_KERNEL);
1075                         if (response) {
1076                                 dev_err(&port->dev, "%s - Error %d submitting "
1077                                         "interrupt urb\n", __func__, response);
1078                         }
1079
1080                 }
1081
1082         }
1083
1084         /* see if we've set up our endpoint info yet   *
1085          * (can't set it up in mos7840_startup as the  *
1086          * structures were not set up at that time.)   */
1087
1088         dbg("port number is %d", port->number);
1089         dbg("serial number is %d", port->serial->minor);
1090         dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
1091         dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
1092         dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
1093         dbg("port's number in the device is %d", mos7840_port->port_num);
1094         mos7840_port->read_urb = port->read_urb;
1095
1096         /* set up our bulk in urb */
1097
1098         usb_fill_bulk_urb(mos7840_port->read_urb,
1099                           serial->dev,
1100                           usb_rcvbulkpipe(serial->dev,
1101                                           port->bulk_in_endpointAddress),
1102                           port->bulk_in_buffer,
1103                           mos7840_port->read_urb->transfer_buffer_length,
1104                           mos7840_bulk_in_callback, mos7840_port);
1105
1106         dbg("mos7840_open: bulkin endpoint is %d",
1107             port->bulk_in_endpointAddress);
1108         mos7840_port->read_urb_busy = true;
1109         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1110         if (response) {
1111                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1112                         __func__, response);
1113                 mos7840_port->read_urb_busy = false;
1114         }
1115
1116         /* initialize our wait queues */
1117         init_waitqueue_head(&mos7840_port->wait_chase);
1118         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1119
1120         /* initialize our icount structure */
1121         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1122
1123         /* initialize our port settings */
1124         /* Must set to enable ints! */
1125         mos7840_port->shadowMCR = MCR_MASTER_IE;
1126         /* send a open port command */
1127         mos7840_port->open = 1;
1128         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1129         mos7840_port->icount.tx = 0;
1130         mos7840_port->icount.rx = 0;
1131
1132         dbg("usb_serial serial:%p       mos7840_port:%p\n      usb_serial_port port:%p",
1133                                 serial, mos7840_port, port);
1134
1135         dbg ("%s leave", __func__);
1136
1137         return 0;
1138
1139 }
1140
1141 /*****************************************************************************
1142  * mos7840_chars_in_buffer
1143  *      this function is called by the tty driver when it wants to know how many
1144  *      bytes of data we currently have outstanding in the port (data that has
1145  *      been written, but hasn't made it out the port yet)
1146  *      If successful, we return the number of bytes left to be written in the
1147  *      system,
1148  *      Otherwise we return zero.
1149  *****************************************************************************/
1150
1151 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1152 {
1153         struct usb_serial_port *port = tty->driver_data;
1154         int i;
1155         int chars = 0;
1156         unsigned long flags;
1157         struct moschip_port *mos7840_port;
1158
1159         dbg("%s", " mos7840_chars_in_buffer:entering ...........");
1160
1161         if (mos7840_port_paranoia_check(port, __func__)) {
1162                 dbg("%s", "Invalid port");
1163                 return 0;
1164         }
1165
1166         mos7840_port = mos7840_get_port_private(port);
1167         if (mos7840_port == NULL) {
1168                 dbg("%s", "mos7840_break:leaving ...........");
1169                 return 0;
1170         }
1171
1172         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1173         for (i = 0; i < NUM_URBS; ++i)
1174                 if (mos7840_port->busy[i])
1175                         chars += URB_TRANSFER_BUFFER_SIZE;
1176         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1177         dbg("%s - returns %d", __func__, chars);
1178         return chars;
1179
1180 }
1181
1182 /*****************************************************************************
1183  * mos7840_close
1184  *      this function is called by the tty driver when a port is closed
1185  *****************************************************************************/
1186
1187 static void mos7840_close(struct usb_serial_port *port)
1188 {
1189         struct usb_serial *serial;
1190         struct moschip_port *mos7840_port;
1191         struct moschip_port *port0;
1192         int j;
1193         __u16 Data;
1194
1195         dbg("%s", "mos7840_close:entering...");
1196
1197         if (mos7840_port_paranoia_check(port, __func__)) {
1198                 dbg("%s", "Port Paranoia failed");
1199                 return;
1200         }
1201
1202         serial = mos7840_get_usb_serial(port, __func__);
1203         if (!serial) {
1204                 dbg("%s", "Serial Paranoia failed");
1205                 return;
1206         }
1207
1208         mos7840_port = mos7840_get_port_private(port);
1209         port0 = mos7840_get_port_private(serial->port[0]);
1210
1211         if (mos7840_port == NULL || port0 == NULL)
1212                 return;
1213
1214         for (j = 0; j < NUM_URBS; ++j)
1215                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1216
1217         /* Freeing Write URBs */
1218         for (j = 0; j < NUM_URBS; ++j) {
1219                 if (mos7840_port->write_urb_pool[j]) {
1220                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1221                                 kfree(mos7840_port->write_urb_pool[j]->
1222                                       transfer_buffer);
1223
1224                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1225                 }
1226         }
1227
1228         /* While closing port, shutdown all bulk read, write  *
1229          * and interrupt read if they exists                  */
1230         if (serial->dev) {
1231                 if (mos7840_port->write_urb) {
1232                         dbg("%s", "Shutdown bulk write");
1233                         usb_kill_urb(mos7840_port->write_urb);
1234                 }
1235                 if (mos7840_port->read_urb) {
1236                         dbg("%s", "Shutdown bulk read");
1237                         usb_kill_urb(mos7840_port->read_urb);
1238                         mos7840_port->read_urb_busy = false;
1239                 }
1240                 if ((&mos7840_port->control_urb)) {
1241                         dbg("%s", "Shutdown control read");
1242                         /*/      usb_kill_urb (mos7840_port->control_urb); */
1243                 }
1244         }
1245 /*      if(mos7840_port->ctrl_buf != NULL) */
1246 /*              kfree(mos7840_port->ctrl_buf); */
1247         port0->open_ports--;
1248         dbg("mos7840_num_open_ports in close%d:in port%d",
1249             port0->open_ports, port->number);
1250         if (port0->open_ports == 0) {
1251                 if (serial->port[0]->interrupt_in_urb) {
1252                         dbg("%s", "Shutdown interrupt_in_urb");
1253                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1254                 }
1255         }
1256
1257         if (mos7840_port->write_urb) {
1258                 /* if this urb had a transfer buffer already (old tx) free it */
1259                 if (mos7840_port->write_urb->transfer_buffer != NULL)
1260                         kfree(mos7840_port->write_urb->transfer_buffer);
1261                 usb_free_urb(mos7840_port->write_urb);
1262         }
1263
1264         Data = 0x0;
1265         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1266
1267         Data = 0x00;
1268         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1269
1270         mos7840_port->open = 0;
1271
1272         dbg("%s", "Leaving ............");
1273 }
1274
1275 /************************************************************************
1276  *
1277  * mos7840_block_until_chase_response
1278  *
1279  *      This function will block the close until one of the following:
1280  *              1. Response to our Chase comes from mos7840
1281  *              2. A timeout of 10 seconds without activity has expired
1282  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1283  *
1284  ************************************************************************/
1285
1286 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1287                                         struct moschip_port *mos7840_port)
1288 {
1289         int timeout = 1 * HZ;
1290         int wait = 10;
1291         int count;
1292
1293         while (1) {
1294                 count = mos7840_chars_in_buffer(tty);
1295
1296                 /* Check for Buffer status */
1297                 if (count <= 0)
1298                         return;
1299
1300                 /* Block the thread for a while */
1301                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1302                                                timeout);
1303                 /* No activity.. count down section */
1304                 wait--;
1305                 if (wait == 0) {
1306                         dbg("%s - TIMEOUT", __func__);
1307                         return;
1308                 } else {
1309                         /* Reset timeout value back to seconds */
1310                         wait = 10;
1311                 }
1312         }
1313
1314 }
1315
1316 /*****************************************************************************
1317  * mos7840_break
1318  *      this function sends a break to the port
1319  *****************************************************************************/
1320 static void mos7840_break(struct tty_struct *tty, int break_state)
1321 {
1322         struct usb_serial_port *port = tty->driver_data;
1323         unsigned char data;
1324         struct usb_serial *serial;
1325         struct moschip_port *mos7840_port;
1326
1327         dbg("%s", "Entering ...........");
1328         dbg("mos7840_break: Start");
1329
1330         if (mos7840_port_paranoia_check(port, __func__)) {
1331                 dbg("%s", "Port Paranoia failed");
1332                 return;
1333         }
1334
1335         serial = mos7840_get_usb_serial(port, __func__);
1336         if (!serial) {
1337                 dbg("%s", "Serial Paranoia failed");
1338                 return;
1339         }
1340
1341         mos7840_port = mos7840_get_port_private(port);
1342
1343         if (mos7840_port == NULL)
1344                 return;
1345
1346         if (serial->dev)
1347                 /* flush and block until tx is empty */
1348                 mos7840_block_until_chase_response(tty, mos7840_port);
1349
1350         if (break_state == -1)
1351                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1352         else
1353                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1354
1355         /* FIXME: no locking on shadowLCR anywhere in driver */
1356         mos7840_port->shadowLCR = data;
1357         dbg("mcs7840_break mos7840_port->shadowLCR is %x",
1358             mos7840_port->shadowLCR);
1359         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1360                              mos7840_port->shadowLCR);
1361
1362         return;
1363 }
1364
1365 /*****************************************************************************
1366  * mos7840_write_room
1367  *      this function is called by the tty driver when it wants to know how many
1368  *      bytes of data we can accept for a specific port.
1369  *      If successful, we return the amount of room that we have for this port
1370  *      Otherwise we return a negative error number.
1371  *****************************************************************************/
1372
1373 static int mos7840_write_room(struct tty_struct *tty)
1374 {
1375         struct usb_serial_port *port = tty->driver_data;
1376         int i;
1377         int room = 0;
1378         unsigned long flags;
1379         struct moschip_port *mos7840_port;
1380
1381         dbg("%s", " mos7840_write_room:entering ...........");
1382
1383         if (mos7840_port_paranoia_check(port, __func__)) {
1384                 dbg("%s", "Invalid port");
1385                 dbg("%s", " mos7840_write_room:leaving ...........");
1386                 return -1;
1387         }
1388
1389         mos7840_port = mos7840_get_port_private(port);
1390         if (mos7840_port == NULL) {
1391                 dbg("%s", "mos7840_break:leaving ...........");
1392                 return -1;
1393         }
1394
1395         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1396         for (i = 0; i < NUM_URBS; ++i) {
1397                 if (!mos7840_port->busy[i])
1398                         room += URB_TRANSFER_BUFFER_SIZE;
1399         }
1400         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1401
1402         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1403         dbg("%s - returns %d", __func__, room);
1404         return room;
1405
1406 }
1407
1408 /*****************************************************************************
1409  * mos7840_write
1410  *      this function is called by the tty driver when data should be written to
1411  *      the port.
1412  *      If successful, we return the number of bytes written, otherwise we
1413  *      return a negative error number.
1414  *****************************************************************************/
1415
1416 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1417                          const unsigned char *data, int count)
1418 {
1419         int status;
1420         int i;
1421         int bytes_sent = 0;
1422         int transfer_size;
1423         unsigned long flags;
1424
1425         struct moschip_port *mos7840_port;
1426         struct usb_serial *serial;
1427         struct urb *urb;
1428         /* __u16 Data; */
1429         const unsigned char *current_position = data;
1430         unsigned char *data1;
1431         dbg("%s", "entering ...........");
1432         /* dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1433                                         mos7840_port->shadowLCR); */
1434
1435 #ifdef NOTMOS7840
1436         Data = 0x00;
1437         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1438         mos7840_port->shadowLCR = Data;
1439         dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
1440         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1441             mos7840_port->shadowLCR);
1442
1443         /* Data = 0x03; */
1444         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1445         /* mos7840_port->shadowLCR=Data;//Need to add later */
1446
1447         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1448         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1449
1450         /* Data = 0x0c; */
1451         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1452         Data = 0x00;
1453         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1454         dbg("mos7840_write:DLL value is %x", Data);
1455
1456         Data = 0x0;
1457         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1458         dbg("mos7840_write:DLM value is %x", Data);
1459
1460         Data = Data & ~SERIAL_LCR_DLAB;
1461         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1462             mos7840_port->shadowLCR);
1463         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1464 #endif
1465
1466         if (mos7840_port_paranoia_check(port, __func__)) {
1467                 dbg("%s", "Port Paranoia failed");
1468                 return -1;
1469         }
1470
1471         serial = port->serial;
1472         if (mos7840_serial_paranoia_check(serial, __func__)) {
1473                 dbg("%s", "Serial Paranoia failed");
1474                 return -1;
1475         }
1476
1477         mos7840_port = mos7840_get_port_private(port);
1478         if (mos7840_port == NULL) {
1479                 dbg("%s", "mos7840_port is NULL");
1480                 return -1;
1481         }
1482
1483         /* try to find a free urb in the list */
1484         urb = NULL;
1485
1486         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1487         for (i = 0; i < NUM_URBS; ++i) {
1488                 if (!mos7840_port->busy[i]) {
1489                         mos7840_port->busy[i] = 1;
1490                         urb = mos7840_port->write_urb_pool[i];
1491                         dbg("URB:%d", i);
1492                         break;
1493                 }
1494         }
1495         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1496
1497         if (urb == NULL) {
1498                 dbg("%s - no more free urbs", __func__);
1499                 goto exit;
1500         }
1501
1502         if (urb->transfer_buffer == NULL) {
1503                 urb->transfer_buffer =
1504                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1505
1506                 if (urb->transfer_buffer == NULL) {
1507                         dev_err(&port->dev, "%s no more kernel memory...\n",
1508                                 __func__);
1509                         goto exit;
1510                 }
1511         }
1512         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1513
1514         memcpy(urb->transfer_buffer, current_position, transfer_size);
1515
1516         /* fill urb with data and submit  */
1517         usb_fill_bulk_urb(urb,
1518                           serial->dev,
1519                           usb_sndbulkpipe(serial->dev,
1520                                           port->bulk_out_endpointAddress),
1521                           urb->transfer_buffer,
1522                           transfer_size,
1523                           mos7840_bulk_out_data_callback, mos7840_port);
1524
1525         data1 = urb->transfer_buffer;
1526         dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
1527
1528         /* send it down the pipe */
1529         status = usb_submit_urb(urb, GFP_ATOMIC);
1530
1531         if (status) {
1532                 mos7840_port->busy[i] = 0;
1533                 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1534                         "with status = %d\n", __func__, status);
1535                 bytes_sent = status;
1536                 goto exit;
1537         }
1538         bytes_sent = transfer_size;
1539         mos7840_port->icount.tx += transfer_size;
1540         smp_wmb();
1541         dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
1542 exit:
1543         return bytes_sent;
1544
1545 }
1546
1547 /*****************************************************************************
1548  * mos7840_throttle
1549  *      this function is called by the tty driver when it wants to stop the data
1550  *      being read from the port.
1551  *****************************************************************************/
1552
1553 static void mos7840_throttle(struct tty_struct *tty)
1554 {
1555         struct usb_serial_port *port = tty->driver_data;
1556         struct moschip_port *mos7840_port;
1557         int status;
1558
1559         if (mos7840_port_paranoia_check(port, __func__)) {
1560                 dbg("%s", "Invalid port");
1561                 return;
1562         }
1563
1564         dbg("- port %d", port->number);
1565
1566         mos7840_port = mos7840_get_port_private(port);
1567
1568         if (mos7840_port == NULL)
1569                 return;
1570
1571         if (!mos7840_port->open) {
1572                 dbg("%s", "port not opened");
1573                 return;
1574         }
1575
1576         dbg("%s", "Entering ..........");
1577
1578         /* if we are implementing XON/XOFF, send the stop character */
1579         if (I_IXOFF(tty)) {
1580                 unsigned char stop_char = STOP_CHAR(tty);
1581                 status = mos7840_write(tty, port, &stop_char, 1);
1582                 if (status <= 0)
1583                         return;
1584         }
1585         /* if we are implementing RTS/CTS, toggle that line */
1586         if (tty->termios->c_cflag & CRTSCTS) {
1587                 mos7840_port->shadowMCR &= ~MCR_RTS;
1588                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1589                                          mos7840_port->shadowMCR);
1590                 if (status < 0)
1591                         return;
1592         }
1593
1594         return;
1595 }
1596
1597 /*****************************************************************************
1598  * mos7840_unthrottle
1599  *      this function is called by the tty driver when it wants to resume
1600  *      the data being read from the port (called after mos7840_throttle is
1601  *      called)
1602  *****************************************************************************/
1603 static void mos7840_unthrottle(struct tty_struct *tty)
1604 {
1605         struct usb_serial_port *port = tty->driver_data;
1606         int status;
1607         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1608
1609         if (mos7840_port_paranoia_check(port, __func__)) {
1610                 dbg("%s", "Invalid port");
1611                 return;
1612         }
1613
1614         if (mos7840_port == NULL)
1615                 return;
1616
1617         if (!mos7840_port->open) {
1618                 dbg("%s - port not opened", __func__);
1619                 return;
1620         }
1621
1622         dbg("%s", "Entering ..........");
1623
1624         /* if we are implementing XON/XOFF, send the start character */
1625         if (I_IXOFF(tty)) {
1626                 unsigned char start_char = START_CHAR(tty);
1627                 status = mos7840_write(tty, port, &start_char, 1);
1628                 if (status <= 0)
1629                         return;
1630         }
1631
1632         /* if we are implementing RTS/CTS, toggle that line */
1633         if (tty->termios->c_cflag & CRTSCTS) {
1634                 mos7840_port->shadowMCR |= MCR_RTS;
1635                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1636                                          mos7840_port->shadowMCR);
1637                 if (status < 0)
1638                         return;
1639         }
1640 }
1641
1642 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file)
1643 {
1644         struct usb_serial_port *port = tty->driver_data;
1645         struct moschip_port *mos7840_port;
1646         unsigned int result;
1647         __u16 msr;
1648         __u16 mcr;
1649         int status;
1650         mos7840_port = mos7840_get_port_private(port);
1651
1652         dbg("%s - port %d", __func__, port->number);
1653
1654         if (mos7840_port == NULL)
1655                 return -ENODEV;
1656
1657         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1658         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1659         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1660             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1661             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1662             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1663             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1664             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1665             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1666
1667         dbg("%s - 0x%04X", __func__, result);
1668
1669         return result;
1670 }
1671
1672 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file,
1673                             unsigned int set, unsigned int clear)
1674 {
1675         struct usb_serial_port *port = tty->driver_data;
1676         struct moschip_port *mos7840_port;
1677         unsigned int mcr;
1678         int status;
1679
1680         dbg("%s - port %d", __func__, port->number);
1681
1682         mos7840_port = mos7840_get_port_private(port);
1683
1684         if (mos7840_port == NULL)
1685                 return -ENODEV;
1686
1687         /* FIXME: What locks the port registers ? */
1688         mcr = mos7840_port->shadowMCR;
1689         if (clear & TIOCM_RTS)
1690                 mcr &= ~MCR_RTS;
1691         if (clear & TIOCM_DTR)
1692                 mcr &= ~MCR_DTR;
1693         if (clear & TIOCM_LOOP)
1694                 mcr &= ~MCR_LOOPBACK;
1695
1696         if (set & TIOCM_RTS)
1697                 mcr |= MCR_RTS;
1698         if (set & TIOCM_DTR)
1699                 mcr |= MCR_DTR;
1700         if (set & TIOCM_LOOP)
1701                 mcr |= MCR_LOOPBACK;
1702
1703         mos7840_port->shadowMCR = mcr;
1704
1705         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1706         if (status < 0) {
1707                 dbg("setting MODEM_CONTROL_REGISTER Failed");
1708                 return status;
1709         }
1710
1711         return 0;
1712 }
1713
1714 /*****************************************************************************
1715  * mos7840_calc_baud_rate_divisor
1716  *      this function calculates the proper baud rate divisor for the specified
1717  *      baud rate.
1718  *****************************************************************************/
1719 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1720                                           __u16 *clk_sel_val)
1721 {
1722
1723         dbg("%s - %d", __func__, baudRate);
1724
1725         if (baudRate <= 115200) {
1726                 *divisor = 115200 / baudRate;
1727                 *clk_sel_val = 0x0;
1728         }
1729         if ((baudRate > 115200) && (baudRate <= 230400)) {
1730                 *divisor = 230400 / baudRate;
1731                 *clk_sel_val = 0x10;
1732         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1733                 *divisor = 403200 / baudRate;
1734                 *clk_sel_val = 0x20;
1735         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1736                 *divisor = 460800 / baudRate;
1737                 *clk_sel_val = 0x30;
1738         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1739                 *divisor = 806400 / baudRate;
1740                 *clk_sel_val = 0x40;
1741         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1742                 *divisor = 921600 / baudRate;
1743                 *clk_sel_val = 0x50;
1744         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1745                 *divisor = 1572864 / baudRate;
1746                 *clk_sel_val = 0x60;
1747         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1748                 *divisor = 3145728 / baudRate;
1749                 *clk_sel_val = 0x70;
1750         }
1751         return 0;
1752
1753 #ifdef NOTMCS7840
1754
1755         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1756                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1757                         *divisor = mos7840_divisor_table[i].Divisor;
1758                         return 0;
1759                 }
1760         }
1761
1762         /* After trying for all the standard baud rates    *
1763          * Try calculating the divisor for this baud rate  */
1764
1765         if (baudrate > 75 && baudrate < 230400) {
1766                 /* get the divisor */
1767                 custom = (__u16) (230400L / baudrate);
1768
1769                 /* Check for round off */
1770                 round1 = (__u16) (2304000L / baudrate);
1771                 round = (__u16) (round1 - (custom * 10));
1772                 if (round > 4)
1773                         custom++;
1774                 *divisor = custom;
1775
1776                 dbg(" Baud %d = %d", baudrate, custom);
1777                 return 0;
1778         }
1779
1780         dbg("%s", " Baud calculation Failed...");
1781         return -1;
1782 #endif
1783 }
1784
1785 /*****************************************************************************
1786  * mos7840_send_cmd_write_baud_rate
1787  *      this function sends the proper command to change the baud rate of the
1788  *      specified port.
1789  *****************************************************************************/
1790
1791 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1792                                             int baudRate)
1793 {
1794         int divisor = 0;
1795         int status;
1796         __u16 Data;
1797         unsigned char number;
1798         __u16 clk_sel_val;
1799         struct usb_serial_port *port;
1800
1801         if (mos7840_port == NULL)
1802                 return -1;
1803
1804         port = (struct usb_serial_port *)mos7840_port->port;
1805         if (mos7840_port_paranoia_check(port, __func__)) {
1806                 dbg("%s", "Invalid port");
1807                 return -1;
1808         }
1809
1810         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1811                 dbg("%s", "Invalid Serial");
1812                 return -1;
1813         }
1814
1815         dbg("%s", "Entering ..........");
1816
1817         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1818
1819         dbg("%s - port = %d, baud = %d", __func__,
1820             mos7840_port->port->number, baudRate);
1821         /* reset clk_uart_sel in spregOffset */
1822         if (baudRate > 115200) {
1823 #ifdef HW_flow_control
1824                 /* NOTE: need to see the pther register to modify */
1825                 /* setting h/w flow control bit to 1 */
1826                 Data = 0x2b;
1827                 mos7840_port->shadowMCR = Data;
1828                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1829                                                                         Data);
1830                 if (status < 0) {
1831                         dbg("Writing spreg failed in set_serial_baud");
1832                         return -1;
1833                 }
1834 #endif
1835
1836         } else {
1837 #ifdef HW_flow_control
1838                 / *setting h/w flow control bit to 0 */
1839                 Data = 0xb;
1840                 mos7840_port->shadowMCR = Data;
1841                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1842                                                                         Data);
1843                 if (status < 0) {
1844                         dbg("Writing spreg failed in set_serial_baud");
1845                         return -1;
1846                 }
1847 #endif
1848
1849         }
1850
1851         if (1) {                /* baudRate <= 115200) */
1852                 clk_sel_val = 0x0;
1853                 Data = 0x0;
1854                 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1855                                                    &clk_sel_val);
1856                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1857                                                                  &Data);
1858                 if (status < 0) {
1859                         dbg("reading spreg failed in set_serial_baud");
1860                         return -1;
1861                 }
1862                 Data = (Data & 0x8f) | clk_sel_val;
1863                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1864                                                                 Data);
1865                 if (status < 0) {
1866                         dbg("Writing spreg failed in set_serial_baud");
1867                         return -1;
1868                 }
1869                 /* Calculate the Divisor */
1870
1871                 if (status) {
1872                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1873                         return status;
1874                 }
1875                 /* Enable access to divisor latch */
1876                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1877                 mos7840_port->shadowLCR = Data;
1878                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1879
1880                 /* Write the divisor */
1881                 Data = (unsigned char)(divisor & 0xff);
1882                 dbg("set_serial_baud Value to write DLL is %x", Data);
1883                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1884
1885                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1886                 dbg("set_serial_baud Value to write DLM is %x", Data);
1887                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1888
1889                 /* Disable access to divisor latch */
1890                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1891                 mos7840_port->shadowLCR = Data;
1892                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1893
1894         }
1895         return status;
1896 }
1897
1898 /*****************************************************************************
1899  * mos7840_change_port_settings
1900  *      This routine is called to set the UART on the device to match
1901  *      the specified new settings.
1902  *****************************************************************************/
1903
1904 static void mos7840_change_port_settings(struct tty_struct *tty,
1905         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1906 {
1907         int baud;
1908         unsigned cflag;
1909         unsigned iflag;
1910         __u8 lData;
1911         __u8 lParity;
1912         __u8 lStop;
1913         int status;
1914         __u16 Data;
1915         struct usb_serial_port *port;
1916         struct usb_serial *serial;
1917
1918         if (mos7840_port == NULL)
1919                 return;
1920
1921         port = (struct usb_serial_port *)mos7840_port->port;
1922
1923         if (mos7840_port_paranoia_check(port, __func__)) {
1924                 dbg("%s", "Invalid port");
1925                 return;
1926         }
1927
1928         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1929                 dbg("%s", "Invalid Serial");
1930                 return;
1931         }
1932
1933         serial = port->serial;
1934
1935         dbg("%s - port %d", __func__, mos7840_port->port->number);
1936
1937         if (!mos7840_port->open) {
1938                 dbg("%s - port not opened", __func__);
1939                 return;
1940         }
1941
1942         dbg("%s", "Entering ..........");
1943
1944         lData = LCR_BITS_8;
1945         lStop = LCR_STOP_1;
1946         lParity = LCR_PAR_NONE;
1947
1948         cflag = tty->termios->c_cflag;
1949         iflag = tty->termios->c_iflag;
1950
1951         /* Change the number of bits */
1952         if (cflag & CSIZE) {
1953                 switch (cflag & CSIZE) {
1954                 case CS5:
1955                         lData = LCR_BITS_5;
1956                         break;
1957
1958                 case CS6:
1959                         lData = LCR_BITS_6;
1960                         break;
1961
1962                 case CS7:
1963                         lData = LCR_BITS_7;
1964                         break;
1965                 default:
1966                 case CS8:
1967                         lData = LCR_BITS_8;
1968                         break;
1969                 }
1970         }
1971         /* Change the Parity bit */
1972         if (cflag & PARENB) {
1973                 if (cflag & PARODD) {
1974                         lParity = LCR_PAR_ODD;
1975                         dbg("%s - parity = odd", __func__);
1976                 } else {
1977                         lParity = LCR_PAR_EVEN;
1978                         dbg("%s - parity = even", __func__);
1979                 }
1980
1981         } else {
1982                 dbg("%s - parity = none", __func__);
1983         }
1984
1985         if (cflag & CMSPAR)
1986                 lParity = lParity | 0x20;
1987
1988         /* Change the Stop bit */
1989         if (cflag & CSTOPB) {
1990                 lStop = LCR_STOP_2;
1991                 dbg("%s - stop bits = 2", __func__);
1992         } else {
1993                 lStop = LCR_STOP_1;
1994                 dbg("%s - stop bits = 1", __func__);
1995         }
1996
1997         /* Update the LCR with the correct value */
1998         mos7840_port->shadowLCR &=
1999             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
2000         mos7840_port->shadowLCR |= (lData | lParity | lStop);
2001
2002         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
2003             mos7840_port->shadowLCR);
2004         /* Disable Interrupts */
2005         Data = 0x00;
2006         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2007
2008         Data = 0x00;
2009         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2010
2011         Data = 0xcf;
2012         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2013
2014         /* Send the updated LCR value to the mos7840 */
2015         Data = mos7840_port->shadowLCR;
2016
2017         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2018
2019         Data = 0x00b;
2020         mos7840_port->shadowMCR = Data;
2021         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2022         Data = 0x00b;
2023         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2024
2025         /* set up the MCR register and send it to the mos7840 */
2026
2027         mos7840_port->shadowMCR = MCR_MASTER_IE;
2028         if (cflag & CBAUD)
2029                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2030
2031         if (cflag & CRTSCTS)
2032                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2033         else
2034                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2035
2036         Data = mos7840_port->shadowMCR;
2037         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2038
2039         /* Determine divisor based on baud rate */
2040         baud = tty_get_baud_rate(tty);
2041
2042         if (!baud) {
2043                 /* pick a default, any default... */
2044                 dbg("%s", "Picked default baud...");
2045                 baud = 9600;
2046         }
2047
2048         dbg("%s - baud rate = %d", __func__, baud);
2049         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2050
2051         /* Enable Interrupts */
2052         Data = 0x0c;
2053         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2054
2055         if (mos7840_port->read_urb_busy == false) {
2056                 mos7840_port->read_urb->dev = serial->dev;
2057                 mos7840_port->read_urb_busy = true;
2058                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2059                 if (status) {
2060                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2061                             status);
2062                         mos7840_port->read_urb_busy = false;
2063                 }
2064         }
2065         wake_up(&mos7840_port->delta_msr_wait);
2066         mos7840_port->delta_msr_cond = 1;
2067         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
2068             mos7840_port->shadowLCR);
2069
2070         return;
2071 }
2072
2073 /*****************************************************************************
2074  * mos7840_set_termios
2075  *      this function is called by the tty driver when it wants to change
2076  *      the termios structure
2077  *****************************************************************************/
2078
2079 static void mos7840_set_termios(struct tty_struct *tty,
2080                                 struct usb_serial_port *port,
2081                                 struct ktermios *old_termios)
2082 {
2083         int status;
2084         unsigned int cflag;
2085         struct usb_serial *serial;
2086         struct moschip_port *mos7840_port;
2087         dbg("mos7840_set_termios: START");
2088         if (mos7840_port_paranoia_check(port, __func__)) {
2089                 dbg("%s", "Invalid port");
2090                 return;
2091         }
2092
2093         serial = port->serial;
2094
2095         if (mos7840_serial_paranoia_check(serial, __func__)) {
2096                 dbg("%s", "Invalid Serial");
2097                 return;
2098         }
2099
2100         mos7840_port = mos7840_get_port_private(port);
2101
2102         if (mos7840_port == NULL)
2103                 return;
2104
2105         if (!mos7840_port->open) {
2106                 dbg("%s - port not opened", __func__);
2107                 return;
2108         }
2109
2110         dbg("%s", "setting termios - ");
2111
2112         cflag = tty->termios->c_cflag;
2113
2114         dbg("%s - clfag %08x iflag %08x", __func__,
2115             tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2116         dbg("%s - old clfag %08x old iflag %08x", __func__,
2117             old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2118         dbg("%s - port %d", __func__, port->number);
2119
2120         /* change the port settings to the new ones specified */
2121
2122         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2123
2124         if (!mos7840_port->read_urb) {
2125                 dbg("%s", "URB KILLED !!!!!");
2126                 return;
2127         }
2128
2129         if (mos7840_port->read_urb_busy == false) {
2130                 mos7840_port->read_urb->dev = serial->dev;
2131                 mos7840_port->read_urb_busy = true;
2132                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2133                 if (status) {
2134                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2135                             status);
2136                         mos7840_port->read_urb_busy = false;
2137                 }
2138         }
2139         return;
2140 }
2141
2142 /*****************************************************************************
2143  * mos7840_get_lsr_info - get line status register info
2144  *
2145  * Purpose: Let user call ioctl() to get info when the UART physically
2146  *          is emptied.  On bus types like RS485, the transmitter must
2147  *          release the bus after transmitting. This must be done when
2148  *          the transmit shift register is empty, not be done when the
2149  *          transmit holding register is empty.  This functionality
2150  *          allows an RS485 driver to be written in user space.
2151  *****************************************************************************/
2152
2153 static int mos7840_get_lsr_info(struct tty_struct *tty,
2154                                 unsigned int __user *value)
2155 {
2156         int count;
2157         unsigned int result = 0;
2158
2159         count = mos7840_chars_in_buffer(tty);
2160         if (count == 0) {
2161                 dbg("%s -- Empty", __func__);
2162                 result = TIOCSER_TEMT;
2163         }
2164
2165         if (copy_to_user(value, &result, sizeof(int)))
2166                 return -EFAULT;
2167         return 0;
2168 }
2169
2170 /*****************************************************************************
2171  * mos7840_get_serial_info
2172  *      function to get information about serial port
2173  *****************************************************************************/
2174
2175 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2176                                    struct serial_struct __user *retinfo)
2177 {
2178         struct serial_struct tmp;
2179
2180         if (mos7840_port == NULL)
2181                 return -1;
2182
2183         if (!retinfo)
2184                 return -EFAULT;
2185
2186         memset(&tmp, 0, sizeof(tmp));
2187
2188         tmp.type = PORT_16550A;
2189         tmp.line = mos7840_port->port->serial->minor;
2190         tmp.port = mos7840_port->port->number;
2191         tmp.irq = 0;
2192         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2193         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2194         tmp.baud_base = 9600;
2195         tmp.close_delay = 5 * HZ;
2196         tmp.closing_wait = 30 * HZ;
2197
2198         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2199                 return -EFAULT;
2200         return 0;
2201 }
2202
2203 /*****************************************************************************
2204  * SerialIoctl
2205  *      this function handles any ioctl calls to the driver
2206  *****************************************************************************/
2207
2208 static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
2209                          unsigned int cmd, unsigned long arg)
2210 {
2211         struct usb_serial_port *port = tty->driver_data;
2212         void __user *argp = (void __user *)arg;
2213         struct moschip_port *mos7840_port;
2214
2215         struct async_icount cnow;
2216         struct async_icount cprev;
2217         struct serial_icounter_struct icount;
2218
2219         if (mos7840_port_paranoia_check(port, __func__)) {
2220                 dbg("%s", "Invalid port");
2221                 return -1;
2222         }
2223
2224         mos7840_port = mos7840_get_port_private(port);
2225
2226         if (mos7840_port == NULL)
2227                 return -1;
2228
2229         dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2230
2231         switch (cmd) {
2232                 /* return number of bytes available */
2233
2234         case TIOCSERGETLSR:
2235                 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2236                 return mos7840_get_lsr_info(tty, argp);
2237                 return 0;
2238
2239         case TIOCGSERIAL:
2240                 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2241                 return mos7840_get_serial_info(mos7840_port, argp);
2242
2243         case TIOCSSERIAL:
2244                 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2245                 break;
2246
2247         case TIOCMIWAIT:
2248                 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2249                 cprev = mos7840_port->icount;
2250                 while (1) {
2251                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2252                         mos7840_port->delta_msr_cond = 0;
2253                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2254                                                  (mos7840_port->
2255                                                   delta_msr_cond == 1));
2256
2257                         /* see if a signal did it */
2258                         if (signal_pending(current))
2259                                 return -ERESTARTSYS;
2260                         cnow = mos7840_port->icount;
2261                         smp_rmb();
2262                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2263                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2264                                 return -EIO;    /* no change => error */
2265                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2266                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2267                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2268                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2269                                 return 0;
2270                         }
2271                         cprev = cnow;
2272                 }
2273                 /* NOTREACHED */
2274                 break;
2275
2276         case TIOCGICOUNT:
2277                 cnow = mos7840_port->icount;
2278                 smp_rmb();
2279                 icount.cts = cnow.cts;
2280                 icount.dsr = cnow.dsr;
2281                 icount.rng = cnow.rng;
2282                 icount.dcd = cnow.dcd;
2283                 icount.rx = cnow.rx;
2284                 icount.tx = cnow.tx;
2285                 icount.frame = cnow.frame;
2286                 icount.overrun = cnow.overrun;
2287                 icount.parity = cnow.parity;
2288                 icount.brk = cnow.brk;
2289                 icount.buf_overrun = cnow.buf_overrun;
2290
2291                 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2292                     port->number, icount.rx, icount.tx);
2293                 if (copy_to_user(argp, &icount, sizeof(icount)))
2294                         return -EFAULT;
2295                 return 0;
2296         default:
2297                 break;
2298         }
2299         return -ENOIOCTLCMD;
2300 }
2301
2302 static int mos7840_calc_num_ports(struct usb_serial *serial)
2303 {
2304         int mos7840_num_ports = 0;
2305
2306         dbg("numberofendpoints: cur %d, alt %d",
2307             (int)serial->interface->cur_altsetting->desc.bNumEndpoints,
2308             (int)serial->interface->altsetting->desc.bNumEndpoints);
2309         if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2310                 mos7840_num_ports = serial->num_ports = 2;
2311         } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2312                 serial->num_bulk_in = 4;
2313                 serial->num_bulk_out = 4;
2314                 mos7840_num_ports = serial->num_ports = 4;
2315         }
2316         dbg ("mos7840_num_ports = %d", mos7840_num_ports);
2317         return mos7840_num_ports;
2318 }
2319
2320 /****************************************************************************
2321  * mos7840_startup
2322  ****************************************************************************/
2323
2324 static int mos7840_startup(struct usb_serial *serial)
2325 {
2326         struct moschip_port *mos7840_port;
2327         struct usb_device *dev;
2328         int i, status;
2329
2330         __u16 Data;
2331         dbg("%s", "mos7840_startup :Entering..........");
2332
2333         if (!serial) {
2334                 dbg("%s", "Invalid Handler");
2335                 return -1;
2336         }
2337
2338         dev = serial->dev;
2339
2340         dbg("%s", "Entering...");
2341         dbg ("mos7840_startup: serial = %p", serial);
2342
2343         /* we set up the pointers to the endpoints in the mos7840_open *
2344          * function, as the structures aren't created yet.             */
2345
2346         /* set up port private structures */
2347         for (i = 0; i < serial->num_ports; ++i) {
2348                 dbg ("mos7840_startup: configuring port %d............", i);
2349                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2350                 if (mos7840_port == NULL) {
2351                         dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2352                         status = -ENOMEM;
2353                         i--; /* don't follow NULL pointer cleaning up */
2354                         goto error;
2355                 }
2356
2357                 /* Initialize all port interrupt end point to port 0 int
2358                  * endpoint. Our device has only one interrupt end point
2359                  * common to all port */
2360
2361                 mos7840_port->port = serial->port[i];
2362                 mos7840_set_port_private(serial->port[i], mos7840_port);
2363                 spin_lock_init(&mos7840_port->pool_lock);
2364
2365                 /* minor is not initialised until later by
2366                  * usb-serial.c:get_free_serial() and cannot therefore be used
2367                  * to index device instances */
2368                 mos7840_port->port_num = i + 1;
2369                 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2370                 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2371                 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2372                 dbg ("serial->minor = %d", serial->minor);
2373
2374                 if (mos7840_port->port_num == 1) {
2375                         mos7840_port->SpRegOffset = 0x0;
2376                         mos7840_port->ControlRegOffset = 0x1;
2377                         mos7840_port->DcrRegOffset = 0x4;
2378                 } else if ((mos7840_port->port_num == 2)
2379                            && (serial->num_ports == 4)) {
2380                         mos7840_port->SpRegOffset = 0x8;
2381                         mos7840_port->ControlRegOffset = 0x9;
2382                         mos7840_port->DcrRegOffset = 0x16;
2383                 } else if ((mos7840_port->port_num == 2)
2384                            && (serial->num_ports == 2)) {
2385                         mos7840_port->SpRegOffset = 0xa;
2386                         mos7840_port->ControlRegOffset = 0xb;
2387                         mos7840_port->DcrRegOffset = 0x19;
2388                 } else if ((mos7840_port->port_num == 3)
2389                            && (serial->num_ports == 4)) {
2390                         mos7840_port->SpRegOffset = 0xa;
2391                         mos7840_port->ControlRegOffset = 0xb;
2392                         mos7840_port->DcrRegOffset = 0x19;
2393                 } else if ((mos7840_port->port_num == 4)
2394                            && (serial->num_ports == 4)) {
2395                         mos7840_port->SpRegOffset = 0xc;
2396                         mos7840_port->ControlRegOffset = 0xd;
2397                         mos7840_port->DcrRegOffset = 0x1c;
2398                 }
2399                 mos7840_dump_serial_port(mos7840_port);
2400                 mos7840_set_port_private(serial->port[i], mos7840_port);
2401
2402                 /* enable rx_disable bit in control register */
2403                 status = mos7840_get_reg_sync(serial->port[i],
2404                                  mos7840_port->ControlRegOffset, &Data);
2405                 if (status < 0) {
2406                         dbg("Reading ControlReg failed status-0x%x", status);
2407                         break;
2408                 } else
2409                         dbg("ControlReg Reading success val is %x, status%d",
2410                             Data, status);
2411                 Data |= 0x08;   /* setting driver done bit */
2412                 Data |= 0x04;   /* sp1_bit to have cts change reflect in
2413                                    modem status reg */
2414
2415                 /* Data |= 0x20; //rx_disable bit */
2416                 status = mos7840_set_reg_sync(serial->port[i],
2417                                          mos7840_port->ControlRegOffset, Data);
2418                 if (status < 0) {
2419                         dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
2420                         break;
2421                 } else
2422                         dbg("ControlReg Writing success(rx_disable) status%d",
2423                             status);
2424
2425                 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2426                    and 0x24 in DCR3 */
2427                 Data = 0x01;
2428                 status = mos7840_set_reg_sync(serial->port[i],
2429                          (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2430                 if (status < 0) {
2431                         dbg("Writing DCR0 failed status-0x%x", status);
2432                         break;
2433                 } else
2434                         dbg("DCR0 Writing success status%d", status);
2435
2436                 Data = 0x05;
2437                 status = mos7840_set_reg_sync(serial->port[i],
2438                          (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2439                 if (status < 0) {
2440                         dbg("Writing DCR1 failed status-0x%x", status);
2441                         break;
2442                 } else
2443                         dbg("DCR1 Writing success status%d", status);
2444
2445                 Data = 0x24;
2446                 status = mos7840_set_reg_sync(serial->port[i],
2447                          (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2448                 if (status < 0) {
2449                         dbg("Writing DCR2 failed status-0x%x", status);
2450                         break;
2451                 } else
2452                         dbg("DCR2 Writing success status%d", status);
2453
2454                 /* write values in clkstart0x0 and clkmulti 0x20 */
2455                 Data = 0x0;
2456                 status = mos7840_set_reg_sync(serial->port[i],
2457                                          CLK_START_VALUE_REGISTER, Data);
2458                 if (status < 0) {
2459                         dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
2460                         break;
2461                 } else
2462                         dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
2463
2464                 Data = 0x20;
2465                 status = mos7840_set_reg_sync(serial->port[i],
2466                                         CLK_MULTI_REGISTER, Data);
2467                 if (status < 0) {
2468                         dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
2469                             status);
2470                         goto error;
2471                 } else
2472                         dbg("CLK_MULTI_REGISTER Writing success status%d",
2473                             status);
2474
2475                 /* write value 0x0 to scratchpad register */
2476                 Data = 0x00;
2477                 status = mos7840_set_uart_reg(serial->port[i],
2478                                                 SCRATCH_PAD_REGISTER, Data);
2479                 if (status < 0) {
2480                         dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
2481                             status);
2482                         break;
2483                 } else
2484                         dbg("SCRATCH_PAD_REGISTER Writing success status%d",
2485                             status);
2486
2487                 /* Zero Length flag register */
2488                 if ((mos7840_port->port_num != 1)
2489                     && (serial->num_ports == 2)) {
2490
2491                         Data = 0xff;
2492                         status = mos7840_set_reg_sync(serial->port[i],
2493                                       (__u16) (ZLP_REG1 +
2494                                       ((__u16)mos7840_port->port_num)), Data);
2495                         dbg("ZLIP offset %x",
2496                             (__u16) (ZLP_REG1 +
2497                                         ((__u16) mos7840_port->port_num)));
2498                         if (status < 0) {
2499                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2500                                     i + 2, status);
2501                                 break;
2502                         } else
2503                                 dbg("ZLP_REG%d Writing success status%d",
2504                                     i + 2, status);
2505                 } else {
2506                         Data = 0xff;
2507                         status = mos7840_set_reg_sync(serial->port[i],
2508                               (__u16) (ZLP_REG1 +
2509                               ((__u16)mos7840_port->port_num) - 0x1), Data);
2510                         dbg("ZLIP offset %x",
2511                             (__u16) (ZLP_REG1 +
2512                                      ((__u16) mos7840_port->port_num) - 0x1));
2513                         if (status < 0) {
2514                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2515                                     i + 1, status);
2516                                 break;
2517                         } else
2518                                 dbg("ZLP_REG%d Writing success status%d",
2519                                     i + 1, status);
2520
2521                 }
2522                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2523                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2524                 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2525                                                                 GFP_KERNEL);
2526                 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2527                                                         !mos7840_port->dr) {
2528                         status = -ENOMEM;
2529                         goto error;
2530                 }
2531         }
2532         dbg ("mos7840_startup: all ports configured...........");
2533
2534         /* Zero Length flag enable */
2535         Data = 0x0f;
2536         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2537         if (status < 0) {
2538                 dbg("Writing ZLP_REG5 failed status-0x%x", status);
2539                 goto error;
2540         } else
2541                 dbg("ZLP_REG5 Writing success status%d", status);
2542
2543         /* setting configuration feature to one */
2544         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2545                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2546         return 0;
2547 error:
2548         for (/* nothing */; i >= 0; i--) {
2549                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2550
2551                 kfree(mos7840_port->dr);
2552                 kfree(mos7840_port->ctrl_buf);
2553                 usb_free_urb(mos7840_port->control_urb);
2554                 kfree(mos7840_port);
2555                 serial->port[i] = NULL;
2556         }
2557         return status;
2558 }
2559
2560 /****************************************************************************
2561  * mos7840_disconnect
2562  *      This function is called whenever the device is removed from the usb bus.
2563  ****************************************************************************/
2564
2565 static void mos7840_disconnect(struct usb_serial *serial)
2566 {
2567         int i;
2568         unsigned long flags;
2569         struct moschip_port *mos7840_port;
2570         dbg("%s", " disconnect :entering..........");
2571
2572         if (!serial) {
2573                 dbg("%s", "Invalid Handler");
2574                 return;
2575         }
2576
2577         /* check for the ports to be closed,close the ports and disconnect */
2578
2579         /* free private structure allocated for serial port  *
2580          * stop reads and writes on all ports                */
2581
2582         for (i = 0; i < serial->num_ports; ++i) {
2583                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2584                 dbg ("mos7840_port %d = %p", i, mos7840_port);
2585                 if (mos7840_port) {
2586                         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2587                         mos7840_port->zombie = 1;
2588                         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2589                         usb_kill_urb(mos7840_port->control_urb);
2590                 }
2591         }
2592
2593         dbg("%s", "Thank u :: ");
2594
2595 }
2596
2597 /****************************************************************************
2598  * mos7840_release
2599  *      This function is called when the usb_serial structure is freed.
2600  ****************************************************************************/
2601
2602 static void mos7840_release(struct usb_serial *serial)
2603 {
2604         int i;
2605         struct moschip_port *mos7840_port;
2606         dbg("%s", " release :entering..........");
2607
2608         if (!serial) {
2609                 dbg("%s", "Invalid Handler");
2610                 return;
2611         }
2612
2613         /* check for the ports to be closed,close the ports and disconnect */
2614
2615         /* free private structure allocated for serial port  *
2616          * stop reads and writes on all ports                */
2617
2618         for (i = 0; i < serial->num_ports; ++i) {
2619                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2620                 dbg("mos7840_port %d = %p", i, mos7840_port);
2621                 if (mos7840_port) {
2622                         kfree(mos7840_port->ctrl_buf);
2623                         kfree(mos7840_port->dr);
2624                         kfree(mos7840_port);
2625                 }
2626         }
2627
2628         dbg("%s", "Thank u :: ");
2629
2630 }
2631
2632 static struct usb_driver io_driver = {
2633         .name = "mos7840",
2634         .probe = usb_serial_probe,
2635         .disconnect = usb_serial_disconnect,
2636         .id_table = moschip_id_table_combined,
2637         .no_dynamic_id = 1,
2638 };
2639
2640 static struct usb_serial_driver moschip7840_4port_device = {
2641         .driver = {
2642                    .owner = THIS_MODULE,
2643                    .name = "mos7840",
2644                    },
2645         .description = DRIVER_DESC,
2646         .usb_driver = &io_driver,
2647         .id_table = moschip_port_id_table,
2648         .num_ports = 4,
2649         .open = mos7840_open,
2650         .close = mos7840_close,
2651         .write = mos7840_write,
2652         .write_room = mos7840_write_room,
2653         .chars_in_buffer = mos7840_chars_in_buffer,
2654         .throttle = mos7840_throttle,
2655         .unthrottle = mos7840_unthrottle,
2656         .calc_num_ports = mos7840_calc_num_ports,
2657 #ifdef MCSSerialProbe
2658         .probe = mos7840_serial_probe,
2659 #endif
2660         .ioctl = mos7840_ioctl,
2661         .set_termios = mos7840_set_termios,
2662         .break_ctl = mos7840_break,
2663         .tiocmget = mos7840_tiocmget,
2664         .tiocmset = mos7840_tiocmset,
2665         .attach = mos7840_startup,
2666         .disconnect = mos7840_disconnect,
2667         .release = mos7840_release,
2668         .read_bulk_callback = mos7840_bulk_in_callback,
2669         .read_int_callback = mos7840_interrupt_callback,
2670 };
2671
2672 /****************************************************************************
2673  * moschip7840_init
2674  *      This is called by the module subsystem, or on startup to initialize us
2675  ****************************************************************************/
2676 static int __init moschip7840_init(void)
2677 {
2678         int retval;
2679
2680         dbg("%s", " mos7840_init :entering..........");
2681
2682         /* Register with the usb serial */
2683         retval = usb_serial_register(&moschip7840_4port_device);
2684
2685         if (retval)
2686                 goto failed_port_device_register;
2687
2688         dbg("%s", "Entering...");
2689         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2690                DRIVER_DESC "\n");
2691
2692         /* Register with the usb */
2693         retval = usb_register(&io_driver);
2694         if (retval == 0) {
2695                 dbg("%s", "Leaving...");
2696                 return 0;
2697         }
2698         usb_serial_deregister(&moschip7840_4port_device);
2699 failed_port_device_register:
2700         return retval;
2701 }
2702
2703 /****************************************************************************
2704  * moschip7840_exit
2705  *      Called when the driver is about to be unloaded.
2706  ****************************************************************************/
2707 static void __exit moschip7840_exit(void)
2708 {
2709
2710         dbg("%s", " mos7840_exit :entering..........");
2711
2712         usb_deregister(&io_driver);
2713
2714         usb_serial_deregister(&moschip7840_4port_device);
2715
2716         dbg("%s", "Entering...");
2717 }
2718
2719 module_init(moschip7840_init);
2720 module_exit(moschip7840_exit);
2721
2722 /* Module information */
2723 MODULE_DESCRIPTION(DRIVER_DESC);
2724 MODULE_LICENSE("GPL");
2725
2726 module_param(debug, bool, S_IRUGO | S_IWUSR);
2727 MODULE_PARM_DESC(debug, "Debug enabled or not");