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