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         return;
1360 }
1361
1362 /*****************************************************************************
1363  * mos7840_write_room
1364  *      this function is called by the tty driver when it wants to know how many
1365  *      bytes of data we can accept for a specific port.
1366  *      If successful, we return the amount of room that we have for this port
1367  *      Otherwise we return a negative error number.
1368  *****************************************************************************/
1369
1370 static int mos7840_write_room(struct tty_struct *tty)
1371 {
1372         struct usb_serial_port *port = tty->driver_data;
1373         int i;
1374         int room = 0;
1375         unsigned long flags;
1376         struct moschip_port *mos7840_port;
1377
1378         dbg("%s", " mos7840_write_room:entering ...........");
1379
1380         if (mos7840_port_paranoia_check(port, __func__)) {
1381                 dbg("%s", "Invalid port");
1382                 dbg("%s", " mos7840_write_room:leaving ...........");
1383                 return -1;
1384         }
1385
1386         mos7840_port = mos7840_get_port_private(port);
1387         if (mos7840_port == NULL) {
1388                 dbg("%s", "mos7840_break:leaving ...........");
1389                 return -1;
1390         }
1391
1392         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1393         for (i = 0; i < NUM_URBS; ++i) {
1394                 if (!mos7840_port->busy[i])
1395                         room += URB_TRANSFER_BUFFER_SIZE;
1396         }
1397         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1398
1399         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1400         dbg("%s - returns %d", __func__, room);
1401         return room;
1402
1403 }
1404
1405 /*****************************************************************************
1406  * mos7840_write
1407  *      this function is called by the tty driver when data should be written to
1408  *      the port.
1409  *      If successful, we return the number of bytes written, otherwise we
1410  *      return a negative error number.
1411  *****************************************************************************/
1412
1413 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1414                          const unsigned char *data, int count)
1415 {
1416         int status;
1417         int i;
1418         int bytes_sent = 0;
1419         int transfer_size;
1420         unsigned long flags;
1421
1422         struct moschip_port *mos7840_port;
1423         struct usb_serial *serial;
1424         struct urb *urb;
1425         /* __u16 Data; */
1426         const unsigned char *current_position = data;
1427         unsigned char *data1;
1428         dbg("%s", "entering ...........");
1429         /* dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1430                                         mos7840_port->shadowLCR); */
1431
1432 #ifdef NOTMOS7840
1433         Data = 0x00;
1434         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1435         mos7840_port->shadowLCR = Data;
1436         dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
1437         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1438             mos7840_port->shadowLCR);
1439
1440         /* Data = 0x03; */
1441         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1442         /* mos7840_port->shadowLCR=Data;//Need to add later */
1443
1444         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1445         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1446
1447         /* Data = 0x0c; */
1448         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1449         Data = 0x00;
1450         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1451         dbg("mos7840_write:DLL value is %x", Data);
1452
1453         Data = 0x0;
1454         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1455         dbg("mos7840_write:DLM value is %x", Data);
1456
1457         Data = Data & ~SERIAL_LCR_DLAB;
1458         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1459             mos7840_port->shadowLCR);
1460         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1461 #endif
1462
1463         if (mos7840_port_paranoia_check(port, __func__)) {
1464                 dbg("%s", "Port Paranoia failed");
1465                 return -1;
1466         }
1467
1468         serial = port->serial;
1469         if (mos7840_serial_paranoia_check(serial, __func__)) {
1470                 dbg("%s", "Serial Paranoia failed");
1471                 return -1;
1472         }
1473
1474         mos7840_port = mos7840_get_port_private(port);
1475         if (mos7840_port == NULL) {
1476                 dbg("%s", "mos7840_port is NULL");
1477                 return -1;
1478         }
1479
1480         /* try to find a free urb in the list */
1481         urb = NULL;
1482
1483         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1484         for (i = 0; i < NUM_URBS; ++i) {
1485                 if (!mos7840_port->busy[i]) {
1486                         mos7840_port->busy[i] = 1;
1487                         urb = mos7840_port->write_urb_pool[i];
1488                         dbg("URB:%d", i);
1489                         break;
1490                 }
1491         }
1492         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1493
1494         if (urb == NULL) {
1495                 dbg("%s - no more free urbs", __func__);
1496                 goto exit;
1497         }
1498
1499         if (urb->transfer_buffer == NULL) {
1500                 urb->transfer_buffer =
1501                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1502
1503                 if (urb->transfer_buffer == NULL) {
1504                         dev_err(&port->dev, "%s no more kernel memory...\n",
1505                                 __func__);
1506                         goto exit;
1507                 }
1508         }
1509         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1510
1511         memcpy(urb->transfer_buffer, current_position, transfer_size);
1512
1513         /* fill urb with data and submit  */
1514         usb_fill_bulk_urb(urb,
1515                           serial->dev,
1516                           usb_sndbulkpipe(serial->dev,
1517                                           port->bulk_out_endpointAddress),
1518                           urb->transfer_buffer,
1519                           transfer_size,
1520                           mos7840_bulk_out_data_callback, mos7840_port);
1521
1522         data1 = urb->transfer_buffer;
1523         dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
1524
1525         /* send it down the pipe */
1526         status = usb_submit_urb(urb, GFP_ATOMIC);
1527
1528         if (status) {
1529                 mos7840_port->busy[i] = 0;
1530                 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1531                         "with status = %d\n", __func__, status);
1532                 bytes_sent = status;
1533                 goto exit;
1534         }
1535         bytes_sent = transfer_size;
1536         mos7840_port->icount.tx += transfer_size;
1537         smp_wmb();
1538         dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
1539 exit:
1540         return bytes_sent;
1541
1542 }
1543
1544 /*****************************************************************************
1545  * mos7840_throttle
1546  *      this function is called by the tty driver when it wants to stop the data
1547  *      being read from the port.
1548  *****************************************************************************/
1549
1550 static void mos7840_throttle(struct tty_struct *tty)
1551 {
1552         struct usb_serial_port *port = tty->driver_data;
1553         struct moschip_port *mos7840_port;
1554         int status;
1555
1556         if (mos7840_port_paranoia_check(port, __func__)) {
1557                 dbg("%s", "Invalid port");
1558                 return;
1559         }
1560
1561         dbg("- port %d", port->number);
1562
1563         mos7840_port = mos7840_get_port_private(port);
1564
1565         if (mos7840_port == NULL)
1566                 return;
1567
1568         if (!mos7840_port->open) {
1569                 dbg("%s", "port not opened");
1570                 return;
1571         }
1572
1573         dbg("%s", "Entering ..........");
1574
1575         /* if we are implementing XON/XOFF, send the stop character */
1576         if (I_IXOFF(tty)) {
1577                 unsigned char stop_char = STOP_CHAR(tty);
1578                 status = mos7840_write(tty, port, &stop_char, 1);
1579                 if (status <= 0)
1580                         return;
1581         }
1582         /* if we are implementing RTS/CTS, toggle that line */
1583         if (tty->termios->c_cflag & CRTSCTS) {
1584                 mos7840_port->shadowMCR &= ~MCR_RTS;
1585                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1586                                          mos7840_port->shadowMCR);
1587                 if (status < 0)
1588                         return;
1589         }
1590
1591         return;
1592 }
1593
1594 /*****************************************************************************
1595  * mos7840_unthrottle
1596  *      this function is called by the tty driver when it wants to resume
1597  *      the data being read from the port (called after mos7840_throttle is
1598  *      called)
1599  *****************************************************************************/
1600 static void mos7840_unthrottle(struct tty_struct *tty)
1601 {
1602         struct usb_serial_port *port = tty->driver_data;
1603         int status;
1604         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1605
1606         if (mos7840_port_paranoia_check(port, __func__)) {
1607                 dbg("%s", "Invalid port");
1608                 return;
1609         }
1610
1611         if (mos7840_port == NULL)
1612                 return;
1613
1614         if (!mos7840_port->open) {
1615                 dbg("%s - port not opened", __func__);
1616                 return;
1617         }
1618
1619         dbg("%s", "Entering ..........");
1620
1621         /* if we are implementing XON/XOFF, send the start character */
1622         if (I_IXOFF(tty)) {
1623                 unsigned char start_char = START_CHAR(tty);
1624                 status = mos7840_write(tty, port, &start_char, 1);
1625                 if (status <= 0)
1626                         return;
1627         }
1628
1629         /* if we are implementing RTS/CTS, toggle that line */
1630         if (tty->termios->c_cflag & CRTSCTS) {
1631                 mos7840_port->shadowMCR |= MCR_RTS;
1632                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1633                                          mos7840_port->shadowMCR);
1634                 if (status < 0)
1635                         return;
1636         }
1637 }
1638
1639 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file)
1640 {
1641         struct usb_serial_port *port = tty->driver_data;
1642         struct moschip_port *mos7840_port;
1643         unsigned int result;
1644         __u16 msr;
1645         __u16 mcr;
1646         int status;
1647         mos7840_port = mos7840_get_port_private(port);
1648
1649         dbg("%s - port %d", __func__, port->number);
1650
1651         if (mos7840_port == NULL)
1652                 return -ENODEV;
1653
1654         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1655         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1656         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1657             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1658             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1659             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1660             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1661             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1662             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1663
1664         dbg("%s - 0x%04X", __func__, result);
1665
1666         return result;
1667 }
1668
1669 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file,
1670                             unsigned int set, unsigned int clear)
1671 {
1672         struct usb_serial_port *port = tty->driver_data;
1673         struct moschip_port *mos7840_port;
1674         unsigned int mcr;
1675         int status;
1676
1677         dbg("%s - port %d", __func__, port->number);
1678
1679         mos7840_port = mos7840_get_port_private(port);
1680
1681         if (mos7840_port == NULL)
1682                 return -ENODEV;
1683
1684         /* FIXME: What locks the port registers ? */
1685         mcr = mos7840_port->shadowMCR;
1686         if (clear & TIOCM_RTS)
1687                 mcr &= ~MCR_RTS;
1688         if (clear & TIOCM_DTR)
1689                 mcr &= ~MCR_DTR;
1690         if (clear & TIOCM_LOOP)
1691                 mcr &= ~MCR_LOOPBACK;
1692
1693         if (set & TIOCM_RTS)
1694                 mcr |= MCR_RTS;
1695         if (set & TIOCM_DTR)
1696                 mcr |= MCR_DTR;
1697         if (set & TIOCM_LOOP)
1698                 mcr |= MCR_LOOPBACK;
1699
1700         mos7840_port->shadowMCR = mcr;
1701
1702         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1703         if (status < 0) {
1704                 dbg("setting MODEM_CONTROL_REGISTER Failed");
1705                 return status;
1706         }
1707
1708         return 0;
1709 }
1710
1711 /*****************************************************************************
1712  * mos7840_calc_baud_rate_divisor
1713  *      this function calculates the proper baud rate divisor for the specified
1714  *      baud rate.
1715  *****************************************************************************/
1716 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1717                                           __u16 *clk_sel_val)
1718 {
1719
1720         dbg("%s - %d", __func__, baudRate);
1721
1722         if (baudRate <= 115200) {
1723                 *divisor = 115200 / baudRate;
1724                 *clk_sel_val = 0x0;
1725         }
1726         if ((baudRate > 115200) && (baudRate <= 230400)) {
1727                 *divisor = 230400 / baudRate;
1728                 *clk_sel_val = 0x10;
1729         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1730                 *divisor = 403200 / baudRate;
1731                 *clk_sel_val = 0x20;
1732         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1733                 *divisor = 460800 / baudRate;
1734                 *clk_sel_val = 0x30;
1735         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1736                 *divisor = 806400 / baudRate;
1737                 *clk_sel_val = 0x40;
1738         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1739                 *divisor = 921600 / baudRate;
1740                 *clk_sel_val = 0x50;
1741         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1742                 *divisor = 1572864 / baudRate;
1743                 *clk_sel_val = 0x60;
1744         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1745                 *divisor = 3145728 / baudRate;
1746                 *clk_sel_val = 0x70;
1747         }
1748         return 0;
1749
1750 #ifdef NOTMCS7840
1751
1752         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1753                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1754                         *divisor = mos7840_divisor_table[i].Divisor;
1755                         return 0;
1756                 }
1757         }
1758
1759         /* After trying for all the standard baud rates    *
1760          * Try calculating the divisor for this baud rate  */
1761
1762         if (baudrate > 75 && baudrate < 230400) {
1763                 /* get the divisor */
1764                 custom = (__u16) (230400L / baudrate);
1765
1766                 /* Check for round off */
1767                 round1 = (__u16) (2304000L / baudrate);
1768                 round = (__u16) (round1 - (custom * 10));
1769                 if (round > 4)
1770                         custom++;
1771                 *divisor = custom;
1772
1773                 dbg(" Baud %d = %d", baudrate, custom);
1774                 return 0;
1775         }
1776
1777         dbg("%s", " Baud calculation Failed...");
1778         return -1;
1779 #endif
1780 }
1781
1782 /*****************************************************************************
1783  * mos7840_send_cmd_write_baud_rate
1784  *      this function sends the proper command to change the baud rate of the
1785  *      specified port.
1786  *****************************************************************************/
1787
1788 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1789                                             int baudRate)
1790 {
1791         int divisor = 0;
1792         int status;
1793         __u16 Data;
1794         unsigned char number;
1795         __u16 clk_sel_val;
1796         struct usb_serial_port *port;
1797
1798         if (mos7840_port == NULL)
1799                 return -1;
1800
1801         port = (struct usb_serial_port *)mos7840_port->port;
1802         if (mos7840_port_paranoia_check(port, __func__)) {
1803                 dbg("%s", "Invalid port");
1804                 return -1;
1805         }
1806
1807         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1808                 dbg("%s", "Invalid Serial");
1809                 return -1;
1810         }
1811
1812         dbg("%s", "Entering ..........");
1813
1814         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1815
1816         dbg("%s - port = %d, baud = %d", __func__,
1817             mos7840_port->port->number, baudRate);
1818         /* reset clk_uart_sel in spregOffset */
1819         if (baudRate > 115200) {
1820 #ifdef HW_flow_control
1821                 /* NOTE: need to see the pther register to modify */
1822                 /* setting h/w flow control bit to 1 */
1823                 Data = 0x2b;
1824                 mos7840_port->shadowMCR = Data;
1825                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1826                                                                         Data);
1827                 if (status < 0) {
1828                         dbg("Writing spreg failed in set_serial_baud");
1829                         return -1;
1830                 }
1831 #endif
1832
1833         } else {
1834 #ifdef HW_flow_control
1835                 / *setting h/w flow control bit to 0 */
1836                 Data = 0xb;
1837                 mos7840_port->shadowMCR = Data;
1838                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1839                                                                         Data);
1840                 if (status < 0) {
1841                         dbg("Writing spreg failed in set_serial_baud");
1842                         return -1;
1843                 }
1844 #endif
1845
1846         }
1847
1848         if (1) {                /* baudRate <= 115200) */
1849                 clk_sel_val = 0x0;
1850                 Data = 0x0;
1851                 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1852                                                    &clk_sel_val);
1853                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1854                                                                  &Data);
1855                 if (status < 0) {
1856                         dbg("reading spreg failed in set_serial_baud");
1857                         return -1;
1858                 }
1859                 Data = (Data & 0x8f) | clk_sel_val;
1860                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1861                                                                 Data);
1862                 if (status < 0) {
1863                         dbg("Writing spreg failed in set_serial_baud");
1864                         return -1;
1865                 }
1866                 /* Calculate the Divisor */
1867
1868                 if (status) {
1869                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1870                         return status;
1871                 }
1872                 /* Enable access to divisor latch */
1873                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1874                 mos7840_port->shadowLCR = Data;
1875                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1876
1877                 /* Write the divisor */
1878                 Data = (unsigned char)(divisor & 0xff);
1879                 dbg("set_serial_baud Value to write DLL is %x", Data);
1880                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1881
1882                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1883                 dbg("set_serial_baud Value to write DLM is %x", Data);
1884                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1885
1886                 /* Disable access to divisor latch */
1887                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1888                 mos7840_port->shadowLCR = Data;
1889                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1890
1891         }
1892         return status;
1893 }
1894
1895 /*****************************************************************************
1896  * mos7840_change_port_settings
1897  *      This routine is called to set the UART on the device to match
1898  *      the specified new settings.
1899  *****************************************************************************/
1900
1901 static void mos7840_change_port_settings(struct tty_struct *tty,
1902         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1903 {
1904         int baud;
1905         unsigned cflag;
1906         unsigned iflag;
1907         __u8 lData;
1908         __u8 lParity;
1909         __u8 lStop;
1910         int status;
1911         __u16 Data;
1912         struct usb_serial_port *port;
1913         struct usb_serial *serial;
1914
1915         if (mos7840_port == NULL)
1916                 return;
1917
1918         port = (struct usb_serial_port *)mos7840_port->port;
1919
1920         if (mos7840_port_paranoia_check(port, __func__)) {
1921                 dbg("%s", "Invalid port");
1922                 return;
1923         }
1924
1925         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1926                 dbg("%s", "Invalid Serial");
1927                 return;
1928         }
1929
1930         serial = port->serial;
1931
1932         dbg("%s - port %d", __func__, mos7840_port->port->number);
1933
1934         if (!mos7840_port->open) {
1935                 dbg("%s - port not opened", __func__);
1936                 return;
1937         }
1938
1939         dbg("%s", "Entering ..........");
1940
1941         lData = LCR_BITS_8;
1942         lStop = LCR_STOP_1;
1943         lParity = LCR_PAR_NONE;
1944
1945         cflag = tty->termios->c_cflag;
1946         iflag = tty->termios->c_iflag;
1947
1948         /* Change the number of bits */
1949         if (cflag & CSIZE) {
1950                 switch (cflag & CSIZE) {
1951                 case CS5:
1952                         lData = LCR_BITS_5;
1953                         break;
1954
1955                 case CS6:
1956                         lData = LCR_BITS_6;
1957                         break;
1958
1959                 case CS7:
1960                         lData = LCR_BITS_7;
1961                         break;
1962                 default:
1963                 case CS8:
1964                         lData = LCR_BITS_8;
1965                         break;
1966                 }
1967         }
1968         /* Change the Parity bit */
1969         if (cflag & PARENB) {
1970                 if (cflag & PARODD) {
1971                         lParity = LCR_PAR_ODD;
1972                         dbg("%s - parity = odd", __func__);
1973                 } else {
1974                         lParity = LCR_PAR_EVEN;
1975                         dbg("%s - parity = even", __func__);
1976                 }
1977
1978         } else {
1979                 dbg("%s - parity = none", __func__);
1980         }
1981
1982         if (cflag & CMSPAR)
1983                 lParity = lParity | 0x20;
1984
1985         /* Change the Stop bit */
1986         if (cflag & CSTOPB) {
1987                 lStop = LCR_STOP_2;
1988                 dbg("%s - stop bits = 2", __func__);
1989         } else {
1990                 lStop = LCR_STOP_1;
1991                 dbg("%s - stop bits = 1", __func__);
1992         }
1993
1994         /* Update the LCR with the correct value */
1995         mos7840_port->shadowLCR &=
1996             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1997         mos7840_port->shadowLCR |= (lData | lParity | lStop);
1998
1999         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
2000             mos7840_port->shadowLCR);
2001         /* Disable Interrupts */
2002         Data = 0x00;
2003         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2004
2005         Data = 0x00;
2006         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2007
2008         Data = 0xcf;
2009         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2010
2011         /* Send the updated LCR value to the mos7840 */
2012         Data = mos7840_port->shadowLCR;
2013
2014         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2015
2016         Data = 0x00b;
2017         mos7840_port->shadowMCR = Data;
2018         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2019         Data = 0x00b;
2020         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2021
2022         /* set up the MCR register and send it to the mos7840 */
2023
2024         mos7840_port->shadowMCR = MCR_MASTER_IE;
2025         if (cflag & CBAUD)
2026                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2027
2028         if (cflag & CRTSCTS)
2029                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2030         else
2031                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2032
2033         Data = mos7840_port->shadowMCR;
2034         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2035
2036         /* Determine divisor based on baud rate */
2037         baud = tty_get_baud_rate(tty);
2038
2039         if (!baud) {
2040                 /* pick a default, any default... */
2041                 dbg("%s", "Picked default baud...");
2042                 baud = 9600;
2043         }
2044
2045         dbg("%s - baud rate = %d", __func__, baud);
2046         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2047
2048         /* Enable Interrupts */
2049         Data = 0x0c;
2050         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2051
2052         if (mos7840_port->read_urb_busy == false) {
2053                 mos7840_port->read_urb->dev = serial->dev;
2054                 mos7840_port->read_urb_busy = true;
2055                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2056                 if (status) {
2057                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2058                             status);
2059                         mos7840_port->read_urb_busy = false;
2060                 }
2061         }
2062         wake_up(&mos7840_port->delta_msr_wait);
2063         mos7840_port->delta_msr_cond = 1;
2064         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
2065             mos7840_port->shadowLCR);
2066
2067         return;
2068 }
2069
2070 /*****************************************************************************
2071  * mos7840_set_termios
2072  *      this function is called by the tty driver when it wants to change
2073  *      the termios structure
2074  *****************************************************************************/
2075
2076 static void mos7840_set_termios(struct tty_struct *tty,
2077                                 struct usb_serial_port *port,
2078                                 struct ktermios *old_termios)
2079 {
2080         int status;
2081         unsigned int cflag;
2082         struct usb_serial *serial;
2083         struct moschip_port *mos7840_port;
2084         dbg("mos7840_set_termios: START");
2085         if (mos7840_port_paranoia_check(port, __func__)) {
2086                 dbg("%s", "Invalid port");
2087                 return;
2088         }
2089
2090         serial = port->serial;
2091
2092         if (mos7840_serial_paranoia_check(serial, __func__)) {
2093                 dbg("%s", "Invalid Serial");
2094                 return;
2095         }
2096
2097         mos7840_port = mos7840_get_port_private(port);
2098
2099         if (mos7840_port == NULL)
2100                 return;
2101
2102         if (!mos7840_port->open) {
2103                 dbg("%s - port not opened", __func__);
2104                 return;
2105         }
2106
2107         dbg("%s", "setting termios - ");
2108
2109         cflag = tty->termios->c_cflag;
2110
2111         dbg("%s - clfag %08x iflag %08x", __func__,
2112             tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2113         dbg("%s - old clfag %08x old iflag %08x", __func__,
2114             old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2115         dbg("%s - port %d", __func__, port->number);
2116
2117         /* change the port settings to the new ones specified */
2118
2119         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2120
2121         if (!mos7840_port->read_urb) {
2122                 dbg("%s", "URB KILLED !!!!!");
2123                 return;
2124         }
2125
2126         if (mos7840_port->read_urb_busy == false) {
2127                 mos7840_port->read_urb->dev = serial->dev;
2128                 mos7840_port->read_urb_busy = true;
2129                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2130                 if (status) {
2131                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2132                             status);
2133                         mos7840_port->read_urb_busy = false;
2134                 }
2135         }
2136         return;
2137 }
2138
2139 /*****************************************************************************
2140  * mos7840_get_lsr_info - get line status register info
2141  *
2142  * Purpose: Let user call ioctl() to get info when the UART physically
2143  *          is emptied.  On bus types like RS485, the transmitter must
2144  *          release the bus after transmitting. This must be done when
2145  *          the transmit shift register is empty, not be done when the
2146  *          transmit holding register is empty.  This functionality
2147  *          allows an RS485 driver to be written in user space.
2148  *****************************************************************************/
2149
2150 static int mos7840_get_lsr_info(struct tty_struct *tty,
2151                                 unsigned int __user *value)
2152 {
2153         int count;
2154         unsigned int result = 0;
2155
2156         count = mos7840_chars_in_buffer(tty);
2157         if (count == 0) {
2158                 dbg("%s -- Empty", __func__);
2159                 result = TIOCSER_TEMT;
2160         }
2161
2162         if (copy_to_user(value, &result, sizeof(int)))
2163                 return -EFAULT;
2164         return 0;
2165 }
2166
2167 /*****************************************************************************
2168  * mos7840_get_serial_info
2169  *      function to get information about serial port
2170  *****************************************************************************/
2171
2172 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2173                                    struct serial_struct __user *retinfo)
2174 {
2175         struct serial_struct tmp;
2176
2177         if (mos7840_port == NULL)
2178                 return -1;
2179
2180         if (!retinfo)
2181                 return -EFAULT;
2182
2183         memset(&tmp, 0, sizeof(tmp));
2184
2185         tmp.type = PORT_16550A;
2186         tmp.line = mos7840_port->port->serial->minor;
2187         tmp.port = mos7840_port->port->number;
2188         tmp.irq = 0;
2189         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2190         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2191         tmp.baud_base = 9600;
2192         tmp.close_delay = 5 * HZ;
2193         tmp.closing_wait = 30 * HZ;
2194
2195         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2196                 return -EFAULT;
2197         return 0;
2198 }
2199
2200 /*****************************************************************************
2201  * SerialIoctl
2202  *      this function handles any ioctl calls to the driver
2203  *****************************************************************************/
2204
2205 static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
2206                          unsigned int cmd, unsigned long arg)
2207 {
2208         struct usb_serial_port *port = tty->driver_data;
2209         void __user *argp = (void __user *)arg;
2210         struct moschip_port *mos7840_port;
2211
2212         struct async_icount cnow;
2213         struct async_icount cprev;
2214         struct serial_icounter_struct icount;
2215
2216         if (mos7840_port_paranoia_check(port, __func__)) {
2217                 dbg("%s", "Invalid port");
2218                 return -1;
2219         }
2220
2221         mos7840_port = mos7840_get_port_private(port);
2222
2223         if (mos7840_port == NULL)
2224                 return -1;
2225
2226         dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2227
2228         switch (cmd) {
2229                 /* return number of bytes available */
2230
2231         case TIOCSERGETLSR:
2232                 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2233                 return mos7840_get_lsr_info(tty, argp);
2234                 return 0;
2235
2236         case TIOCGSERIAL:
2237                 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2238                 return mos7840_get_serial_info(mos7840_port, argp);
2239
2240         case TIOCSSERIAL:
2241                 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2242                 break;
2243
2244         case TIOCMIWAIT:
2245                 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2246                 cprev = mos7840_port->icount;
2247                 while (1) {
2248                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2249                         mos7840_port->delta_msr_cond = 0;
2250                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2251                                                  (mos7840_port->
2252                                                   delta_msr_cond == 1));
2253
2254                         /* see if a signal did it */
2255                         if (signal_pending(current))
2256                                 return -ERESTARTSYS;
2257                         cnow = mos7840_port->icount;
2258                         smp_rmb();
2259                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2260                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2261                                 return -EIO;    /* no change => error */
2262                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2263                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2264                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2265                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2266                                 return 0;
2267                         }
2268                         cprev = cnow;
2269                 }
2270                 /* NOTREACHED */
2271                 break;
2272
2273         case TIOCGICOUNT:
2274                 cnow = mos7840_port->icount;
2275                 smp_rmb();
2276                 icount.cts = cnow.cts;
2277                 icount.dsr = cnow.dsr;
2278                 icount.rng = cnow.rng;
2279                 icount.dcd = cnow.dcd;
2280                 icount.rx = cnow.rx;
2281                 icount.tx = cnow.tx;
2282                 icount.frame = cnow.frame;
2283                 icount.overrun = cnow.overrun;
2284                 icount.parity = cnow.parity;
2285                 icount.brk = cnow.brk;
2286                 icount.buf_overrun = cnow.buf_overrun;
2287
2288                 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2289                     port->number, icount.rx, icount.tx);
2290                 if (copy_to_user(argp, &icount, sizeof(icount)))
2291                         return -EFAULT;
2292                 return 0;
2293         default:
2294                 break;
2295         }
2296         return -ENOIOCTLCMD;
2297 }
2298
2299 static int mos7840_calc_num_ports(struct usb_serial *serial)
2300 {
2301         int mos7840_num_ports = 0;
2302
2303         dbg("numberofendpoints: cur %d, alt %d",
2304             (int)serial->interface->cur_altsetting->desc.bNumEndpoints,
2305             (int)serial->interface->altsetting->desc.bNumEndpoints);
2306         if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2307                 mos7840_num_ports = serial->num_ports = 2;
2308         } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2309                 serial->num_bulk_in = 4;
2310                 serial->num_bulk_out = 4;
2311                 mos7840_num_ports = serial->num_ports = 4;
2312         }
2313         dbg ("mos7840_num_ports = %d", mos7840_num_ports);
2314         return mos7840_num_ports;
2315 }
2316
2317 /****************************************************************************
2318  * mos7840_startup
2319  ****************************************************************************/
2320
2321 static int mos7840_startup(struct usb_serial *serial)
2322 {
2323         struct moschip_port *mos7840_port;
2324         struct usb_device *dev;
2325         int i, status;
2326
2327         __u16 Data;
2328         dbg("%s", "mos7840_startup :Entering..........");
2329
2330         if (!serial) {
2331                 dbg("%s", "Invalid Handler");
2332                 return -1;
2333         }
2334
2335         dev = serial->dev;
2336
2337         dbg("%s", "Entering...");
2338         dbg ("mos7840_startup: serial = %p", serial);
2339
2340         /* we set up the pointers to the endpoints in the mos7840_open *
2341          * function, as the structures aren't created yet.             */
2342
2343         /* set up port private structures */
2344         for (i = 0; i < serial->num_ports; ++i) {
2345                 dbg ("mos7840_startup: configuring port %d............", i);
2346                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2347                 if (mos7840_port == NULL) {
2348                         dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2349                         status = -ENOMEM;
2350                         i--; /* don't follow NULL pointer cleaning up */
2351                         goto error;
2352                 }
2353
2354                 /* Initialize all port interrupt end point to port 0 int
2355                  * endpoint. Our device has only one interrupt end point
2356                  * common to all port */
2357
2358                 mos7840_port->port = serial->port[i];
2359                 mos7840_set_port_private(serial->port[i], mos7840_port);
2360                 spin_lock_init(&mos7840_port->pool_lock);
2361
2362                 /* minor is not initialised until later by
2363                  * usb-serial.c:get_free_serial() and cannot therefore be used
2364                  * to index device instances */
2365                 mos7840_port->port_num = i + 1;
2366                 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2367                 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2368                 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2369                 dbg ("serial->minor = %d", serial->minor);
2370
2371                 if (mos7840_port->port_num == 1) {
2372                         mos7840_port->SpRegOffset = 0x0;
2373                         mos7840_port->ControlRegOffset = 0x1;
2374                         mos7840_port->DcrRegOffset = 0x4;
2375                 } else if ((mos7840_port->port_num == 2)
2376                            && (serial->num_ports == 4)) {
2377                         mos7840_port->SpRegOffset = 0x8;
2378                         mos7840_port->ControlRegOffset = 0x9;
2379                         mos7840_port->DcrRegOffset = 0x16;
2380                 } else if ((mos7840_port->port_num == 2)
2381                            && (serial->num_ports == 2)) {
2382                         mos7840_port->SpRegOffset = 0xa;
2383                         mos7840_port->ControlRegOffset = 0xb;
2384                         mos7840_port->DcrRegOffset = 0x19;
2385                 } else if ((mos7840_port->port_num == 3)
2386                            && (serial->num_ports == 4)) {
2387                         mos7840_port->SpRegOffset = 0xa;
2388                         mos7840_port->ControlRegOffset = 0xb;
2389                         mos7840_port->DcrRegOffset = 0x19;
2390                 } else if ((mos7840_port->port_num == 4)
2391                            && (serial->num_ports == 4)) {
2392                         mos7840_port->SpRegOffset = 0xc;
2393                         mos7840_port->ControlRegOffset = 0xd;
2394                         mos7840_port->DcrRegOffset = 0x1c;
2395                 }
2396                 mos7840_dump_serial_port(mos7840_port);
2397                 mos7840_set_port_private(serial->port[i], mos7840_port);
2398
2399                 /* enable rx_disable bit in control register */
2400                 status = mos7840_get_reg_sync(serial->port[i],
2401                                  mos7840_port->ControlRegOffset, &Data);
2402                 if (status < 0) {
2403                         dbg("Reading ControlReg failed status-0x%x", status);
2404                         break;
2405                 } else
2406                         dbg("ControlReg Reading success val is %x, status%d",
2407                             Data, status);
2408                 Data |= 0x08;   /* setting driver done bit */
2409                 Data |= 0x04;   /* sp1_bit to have cts change reflect in
2410                                    modem status reg */
2411
2412                 /* Data |= 0x20; //rx_disable bit */
2413                 status = mos7840_set_reg_sync(serial->port[i],
2414                                          mos7840_port->ControlRegOffset, Data);
2415                 if (status < 0) {
2416                         dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
2417                         break;
2418                 } else
2419                         dbg("ControlReg Writing success(rx_disable) status%d",
2420                             status);
2421
2422                 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2423                    and 0x24 in DCR3 */
2424                 Data = 0x01;
2425                 status = mos7840_set_reg_sync(serial->port[i],
2426                          (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2427                 if (status < 0) {
2428                         dbg("Writing DCR0 failed status-0x%x", status);
2429                         break;
2430                 } else
2431                         dbg("DCR0 Writing success status%d", status);
2432
2433                 Data = 0x05;
2434                 status = mos7840_set_reg_sync(serial->port[i],
2435                          (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2436                 if (status < 0) {
2437                         dbg("Writing DCR1 failed status-0x%x", status);
2438                         break;
2439                 } else
2440                         dbg("DCR1 Writing success status%d", status);
2441
2442                 Data = 0x24;
2443                 status = mos7840_set_reg_sync(serial->port[i],
2444                          (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2445                 if (status < 0) {
2446                         dbg("Writing DCR2 failed status-0x%x", status);
2447                         break;
2448                 } else
2449                         dbg("DCR2 Writing success status%d", status);
2450
2451                 /* write values in clkstart0x0 and clkmulti 0x20 */
2452                 Data = 0x0;
2453                 status = mos7840_set_reg_sync(serial->port[i],
2454                                          CLK_START_VALUE_REGISTER, Data);
2455                 if (status < 0) {
2456                         dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
2457                         break;
2458                 } else
2459                         dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
2460
2461                 Data = 0x20;
2462                 status = mos7840_set_reg_sync(serial->port[i],
2463                                         CLK_MULTI_REGISTER, Data);
2464                 if (status < 0) {
2465                         dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
2466                             status);
2467                         goto error;
2468                 } else
2469                         dbg("CLK_MULTI_REGISTER Writing success status%d",
2470                             status);
2471
2472                 /* write value 0x0 to scratchpad register */
2473                 Data = 0x00;
2474                 status = mos7840_set_uart_reg(serial->port[i],
2475                                                 SCRATCH_PAD_REGISTER, Data);
2476                 if (status < 0) {
2477                         dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
2478                             status);
2479                         break;
2480                 } else
2481                         dbg("SCRATCH_PAD_REGISTER Writing success status%d",
2482                             status);
2483
2484                 /* Zero Length flag register */
2485                 if ((mos7840_port->port_num != 1)
2486                     && (serial->num_ports == 2)) {
2487
2488                         Data = 0xff;
2489                         status = mos7840_set_reg_sync(serial->port[i],
2490                                       (__u16) (ZLP_REG1 +
2491                                       ((__u16)mos7840_port->port_num)), Data);
2492                         dbg("ZLIP offset %x",
2493                             (__u16) (ZLP_REG1 +
2494                                         ((__u16) mos7840_port->port_num)));
2495                         if (status < 0) {
2496                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2497                                     i + 2, status);
2498                                 break;
2499                         } else
2500                                 dbg("ZLP_REG%d Writing success status%d",
2501                                     i + 2, status);
2502                 } else {
2503                         Data = 0xff;
2504                         status = mos7840_set_reg_sync(serial->port[i],
2505                               (__u16) (ZLP_REG1 +
2506                               ((__u16)mos7840_port->port_num) - 0x1), Data);
2507                         dbg("ZLIP offset %x",
2508                             (__u16) (ZLP_REG1 +
2509                                      ((__u16) mos7840_port->port_num) - 0x1));
2510                         if (status < 0) {
2511                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2512                                     i + 1, status);
2513                                 break;
2514                         } else
2515                                 dbg("ZLP_REG%d Writing success status%d",
2516                                     i + 1, status);
2517
2518                 }
2519                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2520                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2521                 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2522                                                                 GFP_KERNEL);
2523                 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2524                                                         !mos7840_port->dr) {
2525                         status = -ENOMEM;
2526                         goto error;
2527                 }
2528         }
2529         dbg ("mos7840_startup: all ports configured...........");
2530
2531         /* Zero Length flag enable */
2532         Data = 0x0f;
2533         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2534         if (status < 0) {
2535                 dbg("Writing ZLP_REG5 failed status-0x%x", status);
2536                 goto error;
2537         } else
2538                 dbg("ZLP_REG5 Writing success status%d", status);
2539
2540         /* setting configuration feature to one */
2541         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2542                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2543         return 0;
2544 error:
2545         for (/* nothing */; i >= 0; i--) {
2546                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2547
2548                 kfree(mos7840_port->dr);
2549                 kfree(mos7840_port->ctrl_buf);
2550                 usb_free_urb(mos7840_port->control_urb);
2551                 kfree(mos7840_port);
2552                 serial->port[i] = NULL;
2553         }
2554         return status;
2555 }
2556
2557 /****************************************************************************
2558  * mos7840_disconnect
2559  *      This function is called whenever the device is removed from the usb bus.
2560  ****************************************************************************/
2561
2562 static void mos7840_disconnect(struct usb_serial *serial)
2563 {
2564         int i;
2565         unsigned long flags;
2566         struct moschip_port *mos7840_port;
2567         dbg("%s", " disconnect :entering..........");
2568
2569         if (!serial) {
2570                 dbg("%s", "Invalid Handler");
2571                 return;
2572         }
2573
2574         /* check for the ports to be closed,close the ports and disconnect */
2575
2576         /* free private structure allocated for serial port  *
2577          * stop reads and writes on all ports                */
2578
2579         for (i = 0; i < serial->num_ports; ++i) {
2580                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2581                 dbg ("mos7840_port %d = %p", i, mos7840_port);
2582                 if (mos7840_port) {
2583                         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2584                         mos7840_port->zombie = 1;
2585                         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2586                         usb_kill_urb(mos7840_port->control_urb);
2587                 }
2588         }
2589
2590         dbg("%s", "Thank u :: ");
2591
2592 }
2593
2594 /****************************************************************************
2595  * mos7840_release
2596  *      This function is called when the usb_serial structure is freed.
2597  ****************************************************************************/
2598
2599 static void mos7840_release(struct usb_serial *serial)
2600 {
2601         int i;
2602         struct moschip_port *mos7840_port;
2603         dbg("%s", " release :entering..........");
2604
2605         if (!serial) {
2606                 dbg("%s", "Invalid Handler");
2607                 return;
2608         }
2609
2610         /* check for the ports to be closed,close the ports and disconnect */
2611
2612         /* free private structure allocated for serial port  *
2613          * stop reads and writes on all ports                */
2614
2615         for (i = 0; i < serial->num_ports; ++i) {
2616                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2617                 dbg("mos7840_port %d = %p", i, mos7840_port);
2618                 if (mos7840_port) {
2619                         kfree(mos7840_port->ctrl_buf);
2620                         kfree(mos7840_port->dr);
2621                         kfree(mos7840_port);
2622                 }
2623         }
2624
2625         dbg("%s", "Thank u :: ");
2626
2627 }
2628
2629 static struct usb_driver io_driver = {
2630         .name = "mos7840",
2631         .probe = usb_serial_probe,
2632         .disconnect = usb_serial_disconnect,
2633         .id_table = moschip_id_table_combined,
2634         .no_dynamic_id = 1,
2635 };
2636
2637 static struct usb_serial_driver moschip7840_4port_device = {
2638         .driver = {
2639                    .owner = THIS_MODULE,
2640                    .name = "mos7840",
2641                    },
2642         .description = DRIVER_DESC,
2643         .usb_driver = &io_driver,
2644         .id_table = moschip_port_id_table,
2645         .num_ports = 4,
2646         .open = mos7840_open,
2647         .close = mos7840_close,
2648         .write = mos7840_write,
2649         .write_room = mos7840_write_room,
2650         .chars_in_buffer = mos7840_chars_in_buffer,
2651         .throttle = mos7840_throttle,
2652         .unthrottle = mos7840_unthrottle,
2653         .calc_num_ports = mos7840_calc_num_ports,
2654 #ifdef MCSSerialProbe
2655         .probe = mos7840_serial_probe,
2656 #endif
2657         .ioctl = mos7840_ioctl,
2658         .set_termios = mos7840_set_termios,
2659         .break_ctl = mos7840_break,
2660         .tiocmget = mos7840_tiocmget,
2661         .tiocmset = mos7840_tiocmset,
2662         .attach = mos7840_startup,
2663         .disconnect = mos7840_disconnect,
2664         .release = mos7840_release,
2665         .read_bulk_callback = mos7840_bulk_in_callback,
2666         .read_int_callback = mos7840_interrupt_callback,
2667 };
2668
2669 /****************************************************************************
2670  * moschip7840_init
2671  *      This is called by the module subsystem, or on startup to initialize us
2672  ****************************************************************************/
2673 static int __init moschip7840_init(void)
2674 {
2675         int retval;
2676
2677         dbg("%s", " mos7840_init :entering..........");
2678
2679         /* Register with the usb serial */
2680         retval = usb_serial_register(&moschip7840_4port_device);
2681
2682         if (retval)
2683                 goto failed_port_device_register;
2684
2685         dbg("%s", "Entering...");
2686         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2687                DRIVER_DESC "\n");
2688
2689         /* Register with the usb */
2690         retval = usb_register(&io_driver);
2691         if (retval == 0) {
2692                 dbg("%s", "Leaving...");
2693                 return 0;
2694         }
2695         usb_serial_deregister(&moschip7840_4port_device);
2696 failed_port_device_register:
2697         return retval;
2698 }
2699
2700 /****************************************************************************
2701  * moschip7840_exit
2702  *      Called when the driver is about to be unloaded.
2703  ****************************************************************************/
2704 static void __exit moschip7840_exit(void)
2705 {
2706
2707         dbg("%s", " mos7840_exit :entering..........");
2708
2709         usb_deregister(&io_driver);
2710
2711         usb_serial_deregister(&moschip7840_4port_device);
2712
2713         dbg("%s", "Entering...");
2714 }
2715
2716 module_init(moschip7840_init);
2717 module_exit(moschip7840_exit);
2718
2719 /* Module information */
2720 MODULE_DESCRIPTION(DRIVER_DESC);
2721 MODULE_LICENSE("GPL");
2722
2723 module_param(debug, bool, S_IRUGO | S_IWUSR);
2724 MODULE_PARM_DESC(debug, "Debug enabled or not");