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_2P       0xBC00
 125 #define BANDB_DEVICE_ID_USO9ML2_4        0xAC24
 126 #define BANDB_DEVICE_ID_USO9ML2_4P       0xBC01
 127 #define BANDB_DEVICE_ID_US9ML2_2         0xAC29
 128 #define BANDB_DEVICE_ID_US9ML2_4         0xAC30
 129 #define BANDB_DEVICE_ID_USPTL4_2         0xAC31
 130 #define BANDB_DEVICE_ID_USPTL4_4         0xAC32
 131 #define BANDB_DEVICE_ID_USOPTL4_2        0xAC42
 132 #define BANDB_DEVICE_ID_USOPTL4_2P       0xBC02
 133 #define BANDB_DEVICE_ID_USOPTL4_4        0xAC44
 134 #define BANDB_DEVICE_ID_USOPTL4_4P       0xBC03
 135 #define BANDB_DEVICE_ID_USOPTL2_4        0xAC24
 136
 137 /* This driver also supports
 138  * ATEN UC2324 device using Moschip MCS7840
 139  * ATEN UC2322 device using Moschip MCS7820
 140  */
 141 #define USB_VENDOR_ID_ATENINTL          0x0557
 142 #define ATENINTL_DEVICE_ID_UC2324       0x2011
 143 #define ATENINTL_DEVICE_ID_UC2322       0x7820
 144
 145 /* Interrupt Routine Defines    */
 146
 147 #define SERIAL_IIR_RLS      0x06
 148 #define SERIAL_IIR_MS       0x00
 149
 150 /*
 151  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 152  */
 153 #define SERIAL_LSR_DR       0x0001
 154 #define SERIAL_LSR_OE       0x0002
 155 #define SERIAL_LSR_PE       0x0004
 156 #define SERIAL_LSR_FE       0x0008
 157 #define SERIAL_LSR_BI       0x0010
 158
 159 #define MOS_MSR_DELTA_CTS   0x10
 160 #define MOS_MSR_DELTA_DSR   0x20
 161 #define MOS_MSR_DELTA_RI    0x40
 162 #define MOS_MSR_DELTA_CD    0x80
 163
 164 /* Serial Port register Address */
 165 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 166 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 167 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 168 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 169 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 170 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 171 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 172 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 173 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 174
 175 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 176 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 177
 178 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 179
 180 /*
 181  * URB POOL related defines
 182  */
 183 #define NUM_URBS                        16      /* URB Count */
 184 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 185
 186
 187 static const struct usb_device_id moschip_port_id_table[] = {
 188         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 189         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 190         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
 191         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
 192         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 193         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
 194         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 195         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 196         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 197         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 198         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 199         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
 200         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 201         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
 202         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
 203         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 204         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 205         {}                      /* terminating entry */
 206 };
 207
 208 static const struct usb_device_id moschip_id_table_combined[] __devinitconst = {
 209         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 210         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 211         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
 212         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
 213         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 214         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
 215         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 216         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 217         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 218         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 219         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 220         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
 221         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 222         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
 223         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
 224         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 225         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 226         {}                      /* terminating entry */
 227 };
 228
 229 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
 230
 231 /* This structure holds all of the local port information */
 232
 233 struct moschip_port {
 234         int port_num;           /*Actual port number in the device(1,2,etc) */
 235         struct urb *write_urb;  /* write URB for this port */
 236         struct urb *read_urb;   /* read URB for this port */
 237         struct urb *int_urb;
 238         __u8 shadowLCR;         /* last LCR value received */
 239         __u8 shadowMCR;         /* last MCR value received */
 240         char open;
 241         char open_ports;
 242         char zombie;
 243         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 244         wait_queue_head_t delta_msr_wait;       /* for handling sleeping while waiting for msr change to happen */
 245         int delta_msr_cond;
 246         struct async_icount icount;
 247         struct usb_serial_port *port;   /* loop back to the owner of this object */
 248
 249         /* Offsets */
 250         __u8 SpRegOffset;
 251         __u8 ControlRegOffset;
 252         __u8 DcrRegOffset;
 253         /* for processing control URBS in interrupt context */
 254         struct urb *control_urb;
 255         struct usb_ctrlrequest *dr;
 256         char *ctrl_buf;
 257         int MsrLsr;
 258
 259         spinlock_t pool_lock;
 260         struct urb *write_urb_pool[NUM_URBS];
 261         char busy[NUM_URBS];
 262         bool read_urb_busy;
 263 };
 264
 265
 266 static int debug;
 267
 268 /*
 269  * mos7840_set_reg_sync
 270  *      To set the Control register by calling usb_fill_control_urb function
 271  *      by passing usb_sndctrlpipe function as parameter.
 272  */
 273
 274 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 275                                 __u16 val)
 276 {
 277         struct usb_device *dev = port->serial->dev;
 278         val = val & 0x00ff;
 279         dbg("mos7840_set_reg_sync offset is %x, value %x", reg, val);
 280
 281         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 282                                MCS_WR_RTYPE, val, reg, NULL, 0,
 283                                MOS_WDR_TIMEOUT);
 284 }
 285
 286 /*
 287  * mos7840_get_reg_sync
 288  *      To set the Uart register by calling usb_fill_control_urb function by
 289  *      passing usb_rcvctrlpipe function as parameter.
 290  */
 291
 292 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 293                                 __u16 *val)
 294 {
 295         struct usb_device *dev = port->serial->dev;
 296         int ret = 0;
 297         u8 *buf;
 298
 299         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 300         if (!buf)
 301                 return -ENOMEM;
 302
 303         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 304                               MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
 305                               MOS_WDR_TIMEOUT);
 306         *val = buf[0];
 307         dbg("mos7840_get_reg_sync offset is %x, return val %x", reg, *val);
 308
 309         kfree(buf);
 310         return ret;
 311 }
 312
 313 /*
 314  * mos7840_set_uart_reg
 315  *      To set the Uart register by calling usb_fill_control_urb function by
 316  *      passing usb_sndctrlpipe function as parameter.
 317  */
 318
 319 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 320                                 __u16 val)
 321 {
 322
 323         struct usb_device *dev = port->serial->dev;
 324         val = val & 0x00ff;
 325         /* For the UART control registers, the application number need
 326            to be Or'ed */
 327         if (port->serial->num_ports == 4) {
 328                 val |= (((__u16) port->number -
 329                                 (__u16) (port->serial->minor)) + 1) << 8;
 330                 dbg("mos7840_set_uart_reg application number is %x", val);
 331         } else {
 332                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 333                         val |= (((__u16) port->number -
 334                               (__u16) (port->serial->minor)) + 1) << 8;
 335                         dbg("mos7840_set_uart_reg application number is %x",
 336                             val);
 337                 } else {
 338                         val |=
 339                             (((__u16) port->number -
 340                               (__u16) (port->serial->minor)) + 2) << 8;
 341                         dbg("mos7840_set_uart_reg application number is %x",
 342                             val);
 343                 }
 344         }
 345         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 346                                MCS_WR_RTYPE, val, reg, NULL, 0,
 347                                MOS_WDR_TIMEOUT);
 348
 349 }
 350
 351 /*
 352  * mos7840_get_uart_reg
 353  *      To set the Control register by calling usb_fill_control_urb function
 354  *      by passing usb_rcvctrlpipe function as parameter.
 355  */
 356 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 357                                 __u16 *val)
 358 {
 359         struct usb_device *dev = port->serial->dev;
 360         int ret = 0;
 361         __u16 Wval;
 362         u8 *buf;
 363
 364         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 365         if (!buf)
 366                 return -ENOMEM;
 367
 368         /* dbg("application number is %4x",
 369             (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
 370         /* Wval  is same as application number */
 371         if (port->serial->num_ports == 4) {
 372                 Wval =
 373                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 374                      1) << 8;
 375                 dbg("mos7840_get_uart_reg application number is %x", Wval);
 376         } else {
 377                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 378                         Wval = (((__u16) port->number -
 379                               (__u16) (port->serial->minor)) + 1) << 8;
 380                         dbg("mos7840_get_uart_reg application number is %x",
 381                             Wval);
 382                 } else {
 383                         Wval = (((__u16) port->number -
 384                               (__u16) (port->serial->minor)) + 2) << 8;
 385                         dbg("mos7840_get_uart_reg application number is %x",
 386                             Wval);
 387                 }
 388         }
 389         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 390                               MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
 391                               MOS_WDR_TIMEOUT);
 392         *val = buf[0];
 393
 394         kfree(buf);
 395         return ret;
 396 }
 397
 398 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
 399 {
 400
 401         dbg("***************************************");
 402         dbg("SpRegOffset is %2x", mos7840_port->SpRegOffset);
 403         dbg("ControlRegOffset is %2x", mos7840_port->ControlRegOffset);
 404         dbg("DCRRegOffset is %2x", mos7840_port->DcrRegOffset);
 405         dbg("***************************************");
 406
 407 }
 408
 409 /************************************************************************/
 410 /************************************************************************/
 411 /*             I N T E R F A C E   F U N C T I O N S                    */
 412 /*             I N T E R F A C E   F U N C T I O N S                    */
 413 /************************************************************************/
 414 /************************************************************************/
 415
 416 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 417                                             struct moschip_port *data)
 418 {
 419         usb_set_serial_port_data(port, (void *)data);
 420 }
 421
 422 static inline struct moschip_port *mos7840_get_port_private(struct
 423                                                             usb_serial_port
 424                                                             *port)
 425 {
 426         return (struct moschip_port *)usb_get_serial_port_data(port);
 427 }
 428
 429 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 430 {
 431         struct moschip_port *mos7840_port;
 432         struct async_icount *icount;
 433         mos7840_port = port;
 434         icount = &mos7840_port->icount;
 435         if (new_msr &
 436             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 437              MOS_MSR_DELTA_CD)) {
 438                 icount = &mos7840_port->icount;
 439
 440                 /* update input line counters */
 441                 if (new_msr & MOS_MSR_DELTA_CTS) {
 442                         icount->cts++;
 443                         smp_wmb();
 444                 }
 445                 if (new_msr & MOS_MSR_DELTA_DSR) {
 446                         icount->dsr++;
 447                         smp_wmb();
 448                 }
 449                 if (new_msr & MOS_MSR_DELTA_CD) {
 450                         icount->dcd++;
 451                         smp_wmb();
 452                 }
 453                 if (new_msr & MOS_MSR_DELTA_RI) {
 454                         icount->rng++;
 455                         smp_wmb();
 456                 }
 457         }
 458 }
 459
 460 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 461 {
 462         struct async_icount *icount;
 463
 464         dbg("%s - %02x", __func__, new_lsr);
 465
 466         if (new_lsr & SERIAL_LSR_BI) {
 467                 /*
 468                  * Parity and Framing errors only count if they
 469                  * occur exclusive of a break being
 470                  * received.
 471                  */
 472                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 473         }
 474
 475         /* update input line counters */
 476         icount = &port->icount;
 477         if (new_lsr & SERIAL_LSR_BI) {
 478                 icount->brk++;
 479                 smp_wmb();
 480         }
 481         if (new_lsr & SERIAL_LSR_OE) {
 482                 icount->overrun++;
 483                 smp_wmb();
 484         }
 485         if (new_lsr & SERIAL_LSR_PE) {
 486                 icount->parity++;
 487                 smp_wmb();
 488         }
 489         if (new_lsr & SERIAL_LSR_FE) {
 490                 icount->frame++;
 491                 smp_wmb();
 492         }
 493 }
 494
 495 /************************************************************************/
 496 /************************************************************************/
 497 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 498 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 499 /************************************************************************/
 500 /************************************************************************/
 501
 502 static void mos7840_control_callback(struct urb *urb)
 503 {
 504         unsigned char *data;
 505         struct moschip_port *mos7840_port;
 506         __u8 regval = 0x0;
 507         int result = 0;
 508         int status = urb->status;
 509
 510         mos7840_port = urb->context;
 511
 512         switch (status) {
 513         case 0:
 514                 /* success */
 515                 break;
 516         case -ECONNRESET:
 517         case -ENOENT:
 518         case -ESHUTDOWN:
 519                 /* this urb is terminated, clean up */
 520                 dbg("%s - urb shutting down with status: %d", __func__,
 521                     status);
 522                 return;
 523         default:
 524                 dbg("%s - nonzero urb status received: %d", __func__,
 525                     status);
 526                 goto exit;
 527         }
 528
 529         dbg("%s urb buffer size is %d", __func__, urb->actual_length);
 530         dbg("%s mos7840_port->MsrLsr is %d port %d", __func__,
 531             mos7840_port->MsrLsr, mos7840_port->port_num);
 532         data = urb->transfer_buffer;
 533         regval = (__u8) data[0];
 534         dbg("%s data is %x", __func__, regval);
 535         if (mos7840_port->MsrLsr == 0)
 536                 mos7840_handle_new_msr(mos7840_port, regval);
 537         else if (mos7840_port->MsrLsr == 1)
 538                 mos7840_handle_new_lsr(mos7840_port, regval);
 539
 540 exit:
 541         spin_lock(&mos7840_port->pool_lock);
 542         if (!mos7840_port->zombie)
 543                 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
 544         spin_unlock(&mos7840_port->pool_lock);
 545         if (result) {
 546                 dev_err(&urb->dev->dev,
 547                         "%s - Error %d submitting interrupt urb\n",
 548                         __func__, result);
 549         }
 550 }
 551
 552 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 553                            __u16 *val)
 554 {
 555         struct usb_device *dev = mcs->port->serial->dev;
 556         struct usb_ctrlrequest *dr = mcs->dr;
 557         unsigned char *buffer = mcs->ctrl_buf;
 558         int ret;
 559
 560         dr->bRequestType = MCS_RD_RTYPE;
 561         dr->bRequest = MCS_RDREQ;
 562         dr->wValue = cpu_to_le16(Wval); /* 0 */
 563         dr->wIndex = cpu_to_le16(reg);
 564         dr->wLength = cpu_to_le16(2);
 565
 566         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 567                              (unsigned char *)dr, buffer, 2,
 568                              mos7840_control_callback, mcs);
 569         mcs->control_urb->transfer_buffer_length = 2;
 570         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 571         return ret;
 572 }
 573
 574 /*****************************************************************************
 575  * mos7840_interrupt_callback
 576  *      this is the callback function for when we have received data on the
 577  *      interrupt endpoint.
 578  *****************************************************************************/
 579
 580 static void mos7840_interrupt_callback(struct urb *urb)
 581 {
 582         int result;
 583         int length;
 584         struct moschip_port *mos7840_port;
 585         struct usb_serial *serial;
 586         __u16 Data;
 587         unsigned char *data;
 588         __u8 sp[5], st;
 589         int i, rv = 0;
 590         __u16 wval, wreg = 0;
 591         int status = urb->status;
 592
 593         dbg("%s", " : Entering");
 594
 595         switch (status) {
 596         case 0:
 597                 /* success */
 598                 break;
 599         case -ECONNRESET:
 600         case -ENOENT:
 601         case -ESHUTDOWN:
 602                 /* this urb is terminated, clean up */
 603                 dbg("%s - urb shutting down with status: %d", __func__,
 604                     status);
 605                 return;
 606         default:
 607                 dbg("%s - nonzero urb status received: %d", __func__,
 608                     status);
 609                 goto exit;
 610         }
 611
 612         length = urb->actual_length;
 613         data = urb->transfer_buffer;
 614
 615         serial = urb->context;
 616
 617         /* Moschip get 5 bytes
 618          * Byte 1 IIR Port 1 (port.number is 0)
 619          * Byte 2 IIR Port 2 (port.number is 1)
 620          * Byte 3 IIR Port 3 (port.number is 2)
 621          * Byte 4 IIR Port 4 (port.number is 3)
 622          * Byte 5 FIFO status for both */
 623
 624         if (length && length > 5) {
 625                 dbg("%s", "Wrong data !!!");
 626                 return;
 627         }
 628
 629         sp[0] = (__u8) data[0];
 630         sp[1] = (__u8) data[1];
 631         sp[2] = (__u8) data[2];
 632         sp[3] = (__u8) data[3];
 633         st = (__u8) data[4];
 634
 635         for (i = 0; i < serial->num_ports; i++) {
 636                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 637                 wval =
 638                     (((__u16) serial->port[i]->number -
 639                       (__u16) (serial->minor)) + 1) << 8;
 640                 if (mos7840_port->open) {
 641                         if (sp[i] & 0x01) {
 642                                 dbg("SP%d No Interrupt !!!", i);
 643                         } else {
 644                                 switch (sp[i] & 0x0f) {
 645                                 case SERIAL_IIR_RLS:
 646                                         dbg("Serial Port %d: Receiver status error or ", i);
 647                                         dbg("address bit detected in 9-bit mode");
 648                                         mos7840_port->MsrLsr = 1;
 649                                         wreg = LINE_STATUS_REGISTER;
 650                                         break;
 651                                 case SERIAL_IIR_MS:
 652                                         dbg("Serial Port %d: Modem status change", i);
 653                                         mos7840_port->MsrLsr = 0;
 654                                         wreg = MODEM_STATUS_REGISTER;
 655                                         break;
 656                                 }
 657                                 spin_lock(&mos7840_port->pool_lock);
 658                                 if (!mos7840_port->zombie) {
 659                                         rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 660                                 } else {
 661                                         spin_unlock(&mos7840_port->pool_lock);
 662                                         return;
 663                                 }
 664                                 spin_unlock(&mos7840_port->pool_lock);
 665                         }
 666                 }
 667         }
 668         if (!(rv < 0))
 669                 /* the completion handler for the control urb will resubmit */
 670                 return;
 671 exit:
 672         result = usb_submit_urb(urb, GFP_ATOMIC);
 673         if (result) {
 674                 dev_err(&urb->dev->dev,
 675                         "%s - Error %d submitting interrupt urb\n",
 676                         __func__, result);
 677         }
 678 }
 679
 680 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 681                                        const char *function)
 682 {
 683         if (!port) {
 684                 dbg("%s - port == NULL", function);
 685                 return -1;
 686         }
 687         if (!port->serial) {
 688                 dbg("%s - port->serial == NULL", function);
 689                 return -1;
 690         }
 691
 692         return 0;
 693 }
 694
 695 /* Inline functions to check the sanity of a pointer that is passed to us */
 696 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 697                                          const char *function)
 698 {
 699         if (!serial) {
 700                 dbg("%s - serial == NULL", function);
 701                 return -1;
 702         }
 703         if (!serial->type) {
 704                 dbg("%s - serial->type == NULL!", function);
 705                 return -1;
 706         }
 707
 708         return 0;
 709 }
 710
 711 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 712                                                  const char *function)
 713 {
 714         /* if no port was specified, or it fails a paranoia check */
 715         if (!port ||
 716             mos7840_port_paranoia_check(port, function) ||
 717             mos7840_serial_paranoia_check(port->serial, function)) {
 718                 /* then say that we don't have a valid usb_serial thing,
 719                  * which will end up genrating -ENODEV return values */
 720                 return NULL;
 721         }
 722
 723         return port->serial;
 724 }
 725
 726 /*****************************************************************************
 727  * mos7840_bulk_in_callback
 728  *      this is the callback function for when we have received data on the
 729  *      bulk in endpoint.
 730  *****************************************************************************/
 731
 732 static void mos7840_bulk_in_callback(struct urb *urb)
 733 {
 734         int retval;
 735         unsigned char *data;
 736         struct usb_serial *serial;
 737         struct usb_serial_port *port;
 738         struct moschip_port *mos7840_port;
 739         struct tty_struct *tty;
 740         int status = urb->status;
 741
 742         mos7840_port = urb->context;
 743         if (!mos7840_port) {
 744                 dbg("%s", "NULL mos7840_port pointer");
 745                 return;
 746         }
 747
 748         if (status) {
 749                 dbg("nonzero read bulk status received: %d", status);
 750                 mos7840_port->read_urb_busy = false;
 751                 return;
 752         }
 753
 754         port = (struct usb_serial_port *)mos7840_port->port;
 755         if (mos7840_port_paranoia_check(port, __func__)) {
 756                 dbg("%s", "Port Paranoia failed");
 757                 mos7840_port->read_urb_busy = false;
 758                 return;
 759         }
 760
 761         serial = mos7840_get_usb_serial(port, __func__);
 762         if (!serial) {
 763                 dbg("%s", "Bad serial pointer");
 764                 mos7840_port->read_urb_busy = false;
 765                 return;
 766         }
 767
 768         dbg("%s", "Entering... ");
 769
 770         data = urb->transfer_buffer;
 771
 772         dbg("%s", "Entering ...........");
 773
 774         if (urb->actual_length) {
 775                 tty = tty_port_tty_get(&mos7840_port->port->port);
 776                 if (tty) {
 777                         tty_insert_flip_string(tty, data, urb->actual_length);
 778                         dbg(" %s ", data);
 779                         tty_flip_buffer_push(tty);
 780                         tty_kref_put(tty);
 781                 }
 782                 mos7840_port->icount.rx += urb->actual_length;
 783                 smp_wmb();
 784                 dbg("mos7840_port->icount.rx is %d:",
 785                     mos7840_port->icount.rx);
 786         }
 787
 788         if (!mos7840_port->read_urb) {
 789                 dbg("%s", "URB KILLED !!!");
 790                 mos7840_port->read_urb_busy = false;
 791                 return;
 792         }
 793
 794
 795         mos7840_port->read_urb->dev = serial->dev;
 796
 797         mos7840_port->read_urb_busy = true;
 798         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 799
 800         if (retval) {
 801                 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
 802                 mos7840_port->read_urb_busy = false;
 803         }
 804 }
 805
 806 /*****************************************************************************
 807  * mos7840_bulk_out_data_callback
 808  *      this is the callback function for when we have finished sending
 809  *      serial data on the bulk out endpoint.
 810  *****************************************************************************/
 811
 812 static void mos7840_bulk_out_data_callback(struct urb *urb)
 813 {
 814         struct moschip_port *mos7840_port;
 815         struct tty_struct *tty;
 816         int status = urb->status;
 817         int i;
 818
 819         mos7840_port = urb->context;
 820         spin_lock(&mos7840_port->pool_lock);
 821         for (i = 0; i < NUM_URBS; i++) {
 822                 if (urb == mos7840_port->write_urb_pool[i]) {
 823                         mos7840_port->busy[i] = 0;
 824                         break;
 825                 }
 826         }
 827         spin_unlock(&mos7840_port->pool_lock);
 828
 829         if (status) {
 830                 dbg("nonzero write bulk status received:%d", status);
 831                 return;
 832         }
 833
 834         if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
 835                 dbg("%s", "Port Paranoia failed");
 836                 return;
 837         }
 838
 839         dbg("%s", "Entering .........");
 840
 841         tty = tty_port_tty_get(&mos7840_port->port->port);
 842         if (tty && mos7840_port->open)
 843                 tty_wakeup(tty);
 844         tty_kref_put(tty);
 845
 846 }
 847
 848 /************************************************************************/
 849 /*       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       */
 850 /************************************************************************/
 851 #ifdef MCSSerialProbe
 852 static int mos7840_serial_probe(struct usb_serial *serial,
 853                                 const struct usb_device_id *id)
 854 {
 855
 856         /*need to implement the mode_reg reading and updating\
 857            structures usb_serial_ device_type\
 858            (i.e num_ports, num_bulkin,bulkout etc) */
 859         /* Also we can update the changes  attach */
 860         return 1;
 861 }
 862 #endif
 863
 864 /*****************************************************************************
 865  * mos7840_open
 866  *      this function is called by the tty driver when a port is opened
 867  *      If successful, we return 0
 868  *      Otherwise we return a negative error number.
 869  *****************************************************************************/
 870
 871 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
 872 {
 873         int response;
 874         int j;
 875         struct usb_serial *serial;
 876         struct urb *urb;
 877         __u16 Data;
 878         int status;
 879         struct moschip_port *mos7840_port;
 880         struct moschip_port *port0;
 881
 882         dbg ("%s enter", __func__);
 883
 884         if (mos7840_port_paranoia_check(port, __func__)) {
 885                 dbg("%s", "Port Paranoia failed");
 886                 return -ENODEV;
 887         }
 888
 889         serial = port->serial;
 890
 891         if (mos7840_serial_paranoia_check(serial, __func__)) {
 892                 dbg("%s", "Serial Paranoia failed");
 893                 return -ENODEV;
 894         }
 895
 896         mos7840_port = mos7840_get_port_private(port);
 897         port0 = mos7840_get_port_private(serial->port[0]);
 898
 899         if (mos7840_port == NULL || port0 == NULL)
 900                 return -ENODEV;
 901
 902         usb_clear_halt(serial->dev, port->write_urb->pipe);
 903         usb_clear_halt(serial->dev, port->read_urb->pipe);
 904         port0->open_ports++;
 905
 906         /* Initialising the write urb pool */
 907         for (j = 0; j < NUM_URBS; ++j) {
 908                 urb = usb_alloc_urb(0, GFP_KERNEL);
 909                 mos7840_port->write_urb_pool[j] = urb;
 910
 911                 if (urb == NULL) {
 912                         dev_err(&port->dev, "No more urbs???\n");
 913                         continue;
 914                 }
 915
 916                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 917                                                                 GFP_KERNEL);
 918                 if (!urb->transfer_buffer) {
 919                         usb_free_urb(urb);
 920                         mos7840_port->write_urb_pool[j] = NULL;
 921                         dev_err(&port->dev,
 922                                 "%s-out of memory for urb buffers.\n",
 923                                 __func__);
 924                         continue;
 925                 }
 926         }
 927
 928 /*****************************************************************************
 929  * Initialize MCS7840 -- Write Init values to corresponding Registers
 930  *
 931  * Register Index
 932  * 1 : IER
 933  * 2 : FCR
 934  * 3 : LCR
 935  * 4 : MCR
 936  *
 937  * 0x08 : SP1/2 Control Reg
 938  *****************************************************************************/
 939
 940         /* NEED to check the following Block */
 941
 942         Data = 0x0;
 943         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 944         if (status < 0) {
 945                 dbg("Reading Spreg failed");
 946                 return -1;
 947         }
 948         Data |= 0x80;
 949         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 950         if (status < 0) {
 951                 dbg("writing Spreg failed");
 952                 return -1;
 953         }
 954
 955         Data &= ~0x80;
 956         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 957         if (status < 0) {
 958                 dbg("writing Spreg failed");
 959                 return -1;
 960         }
 961         /* End of block to be checked */
 962
 963         Data = 0x0;
 964         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 965                                                                         &Data);
 966         if (status < 0) {
 967                 dbg("Reading Controlreg failed");
 968                 return -1;
 969         }
 970         Data |= 0x08;           /* Driver done bit */
 971         Data |= 0x20;           /* rx_disable */
 972         status = mos7840_set_reg_sync(port,
 973                                 mos7840_port->ControlRegOffset, Data);
 974         if (status < 0) {
 975                 dbg("writing Controlreg failed");
 976                 return -1;
 977         }
 978         /* do register settings here */
 979         /* Set all regs to the device default values. */
 980         /***********************************
 981          * First Disable all interrupts.
 982          ***********************************/
 983         Data = 0x00;
 984         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 985         if (status < 0) {
 986                 dbg("disabling interrupts failed");
 987                 return -1;
 988         }
 989         /* Set FIFO_CONTROL_REGISTER to the default value */
 990         Data = 0x00;
 991         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 992         if (status < 0) {
 993                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
 994                 return -1;
 995         }
 996
 997         Data = 0xcf;
 998         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 999         if (status < 0) {
1000                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
1001                 return -1;
1002         }
1003
1004         Data = 0x03;
1005         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1006         mos7840_port->shadowLCR = Data;
1007
1008         Data = 0x0b;
1009         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1010         mos7840_port->shadowMCR = Data;
1011
1012         Data = 0x00;
1013         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1014         mos7840_port->shadowLCR = Data;
1015
1016         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1017         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1018
1019         Data = 0x0c;
1020         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1021
1022         Data = 0x0;
1023         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1024
1025         Data = 0x00;
1026         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1027
1028         Data = Data & ~SERIAL_LCR_DLAB;
1029         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1030         mos7840_port->shadowLCR = Data;
1031
1032         /* clearing Bulkin and Bulkout Fifo */
1033         Data = 0x0;
1034         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1035
1036         Data = Data | 0x0c;
1037         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1038
1039         Data = Data & ~0x0c;
1040         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1041         /* Finally enable all interrupts */
1042         Data = 0x0c;
1043         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1044
1045         /* clearing rx_disable */
1046         Data = 0x0;
1047         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1048                                                                         &Data);
1049         Data = Data & ~0x20;
1050         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1051                                                                         Data);
1052
1053         /* rx_negate */
1054         Data = 0x0;
1055         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1056                                                                         &Data);
1057         Data = Data | 0x10;
1058         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1059                                                                         Data);
1060
1061         /* Check to see if we've set up our endpoint info yet    *
1062          * (can't set it up in mos7840_startup as the structures *
1063          * were not set up at that time.)                        */
1064         if (port0->open_ports == 1) {
1065                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1066                         /* set up interrupt urb */
1067                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1068                                 serial->dev,
1069                                 usb_rcvintpipe(serial->dev,
1070                                 serial->port[0]->interrupt_in_endpointAddress),
1071                                 serial->port[0]->interrupt_in_buffer,
1072                                 serial->port[0]->interrupt_in_urb->
1073                                 transfer_buffer_length,
1074                                 mos7840_interrupt_callback,
1075                                 serial,
1076                                 serial->port[0]->interrupt_in_urb->interval);
1077
1078                         /* start interrupt read for mos7840               *
1079                          * will continue as long as mos7840 is connected  */
1080
1081                         response =
1082                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1083                                            GFP_KERNEL);
1084                         if (response) {
1085                                 dev_err(&port->dev, "%s - Error %d submitting "
1086                                         "interrupt urb\n", __func__, response);
1087                         }
1088
1089                 }
1090
1091         }
1092
1093         /* see if we've set up our endpoint info yet   *
1094          * (can't set it up in mos7840_startup as the  *
1095          * structures were not set up at that time.)   */
1096
1097         dbg("port number is %d", port->number);
1098         dbg("serial number is %d", port->serial->minor);
1099         dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
1100         dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
1101         dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
1102         dbg("port's number in the device is %d", mos7840_port->port_num);
1103         mos7840_port->read_urb = port->read_urb;
1104
1105         /* set up our bulk in urb */
1106
1107         usb_fill_bulk_urb(mos7840_port->read_urb,
1108                           serial->dev,
1109                           usb_rcvbulkpipe(serial->dev,
1110                                           port->bulk_in_endpointAddress),
1111                           port->bulk_in_buffer,
1112                           mos7840_port->read_urb->transfer_buffer_length,
1113                           mos7840_bulk_in_callback, mos7840_port);
1114
1115         dbg("mos7840_open: bulkin endpoint is %d",
1116             port->bulk_in_endpointAddress);
1117         mos7840_port->read_urb_busy = true;
1118         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1119         if (response) {
1120                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1121                         __func__, response);
1122                 mos7840_port->read_urb_busy = false;
1123         }
1124
1125         /* initialize our wait queues */
1126         init_waitqueue_head(&mos7840_port->wait_chase);
1127         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1128
1129         /* initialize our icount structure */
1130         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1131
1132         /* initialize our port settings */
1133         /* Must set to enable ints! */
1134         mos7840_port->shadowMCR = MCR_MASTER_IE;
1135         /* send a open port command */
1136         mos7840_port->open = 1;
1137         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1138         mos7840_port->icount.tx = 0;
1139         mos7840_port->icount.rx = 0;
1140
1141         dbg("usb_serial serial:%p       mos7840_port:%p\n      usb_serial_port port:%p",
1142                                 serial, mos7840_port, port);
1143
1144         dbg ("%s leave", __func__);
1145
1146         return 0;
1147
1148 }
1149
1150 /*****************************************************************************
1151  * mos7840_chars_in_buffer
1152  *      this function is called by the tty driver when it wants to know how many
1153  *      bytes of data we currently have outstanding in the port (data that has
1154  *      been written, but hasn't made it out the port yet)
1155  *      If successful, we return the number of bytes left to be written in the
1156  *      system,
1157  *      Otherwise we return zero.
1158  *****************************************************************************/
1159
1160 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1161 {
1162         struct usb_serial_port *port = tty->driver_data;
1163         int i;
1164         int chars = 0;
1165         unsigned long flags;
1166         struct moschip_port *mos7840_port;
1167
1168         dbg("%s", " mos7840_chars_in_buffer:entering ...........");
1169
1170         if (mos7840_port_paranoia_check(port, __func__)) {
1171                 dbg("%s", "Invalid port");
1172                 return 0;
1173         }
1174
1175         mos7840_port = mos7840_get_port_private(port);
1176         if (mos7840_port == NULL) {
1177                 dbg("%s", "mos7840_break:leaving ...........");
1178                 return 0;
1179         }
1180
1181         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1182         for (i = 0; i < NUM_URBS; ++i)
1183                 if (mos7840_port->busy[i])
1184                         chars += URB_TRANSFER_BUFFER_SIZE;
1185         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1186         dbg("%s - returns %d", __func__, chars);
1187         return chars;
1188
1189 }
1190
1191 /*****************************************************************************
1192  * mos7840_close
1193  *      this function is called by the tty driver when a port is closed
1194  *****************************************************************************/
1195
1196 static void mos7840_close(struct usb_serial_port *port)
1197 {
1198         struct usb_serial *serial;
1199         struct moschip_port *mos7840_port;
1200         struct moschip_port *port0;
1201         int j;
1202         __u16 Data;
1203
1204         dbg("%s", "mos7840_close:entering...");
1205
1206         if (mos7840_port_paranoia_check(port, __func__)) {
1207                 dbg("%s", "Port Paranoia failed");
1208                 return;
1209         }
1210
1211         serial = mos7840_get_usb_serial(port, __func__);
1212         if (!serial) {
1213                 dbg("%s", "Serial Paranoia failed");
1214                 return;
1215         }
1216
1217         mos7840_port = mos7840_get_port_private(port);
1218         port0 = mos7840_get_port_private(serial->port[0]);
1219
1220         if (mos7840_port == NULL || port0 == NULL)
1221                 return;
1222
1223         for (j = 0; j < NUM_URBS; ++j)
1224                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1225
1226         /* Freeing Write URBs */
1227         for (j = 0; j < NUM_URBS; ++j) {
1228                 if (mos7840_port->write_urb_pool[j]) {
1229                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1230                                 kfree(mos7840_port->write_urb_pool[j]->
1231                                       transfer_buffer);
1232
1233                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1234                 }
1235         }
1236
1237         /* While closing port, shutdown all bulk read, write  *
1238          * and interrupt read if they exists                  */
1239         if (serial->dev) {
1240                 if (mos7840_port->write_urb) {
1241                         dbg("%s", "Shutdown bulk write");
1242                         usb_kill_urb(mos7840_port->write_urb);
1243                 }
1244                 if (mos7840_port->read_urb) {
1245                         dbg("%s", "Shutdown bulk read");
1246                         usb_kill_urb(mos7840_port->read_urb);
1247                         mos7840_port->read_urb_busy = false;
1248                 }
1249                 if ((&mos7840_port->control_urb)) {
1250                         dbg("%s", "Shutdown control read");
1251                         /*/      usb_kill_urb (mos7840_port->control_urb); */
1252                 }
1253         }
1254 /*      if(mos7840_port->ctrl_buf != NULL) */
1255 /*              kfree(mos7840_port->ctrl_buf); */
1256         port0->open_ports--;
1257         dbg("mos7840_num_open_ports in close%d:in port%d",
1258             port0->open_ports, port->number);
1259         if (port0->open_ports == 0) {
1260                 if (serial->port[0]->interrupt_in_urb) {
1261                         dbg("%s", "Shutdown interrupt_in_urb");
1262                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1263                 }
1264         }
1265
1266         if (mos7840_port->write_urb) {
1267                 /* if this urb had a transfer buffer already (old tx) free it */
1268                 if (mos7840_port->write_urb->transfer_buffer != NULL)
1269                         kfree(mos7840_port->write_urb->transfer_buffer);
1270                 usb_free_urb(mos7840_port->write_urb);
1271         }
1272
1273         Data = 0x0;
1274         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1275
1276         Data = 0x00;
1277         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1278
1279         mos7840_port->open = 0;
1280
1281         dbg("%s", "Leaving ............");
1282 }
1283
1284 /************************************************************************
1285  *
1286  * mos7840_block_until_chase_response
1287  *
1288  *      This function will block the close until one of the following:
1289  *              1. Response to our Chase comes from mos7840
1290  *              2. A timeout of 10 seconds without activity has expired
1291  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1292  *
1293  ************************************************************************/
1294
1295 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1296                                         struct moschip_port *mos7840_port)
1297 {
1298         int timeout = 1 * HZ;
1299         int wait = 10;
1300         int count;
1301
1302         while (1) {
1303                 count = mos7840_chars_in_buffer(tty);
1304
1305                 /* Check for Buffer status */
1306                 if (count <= 0)
1307                         return;
1308
1309                 /* Block the thread for a while */
1310                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1311                                                timeout);
1312                 /* No activity.. count down section */
1313                 wait--;
1314                 if (wait == 0) {
1315                         dbg("%s - TIMEOUT", __func__);
1316                         return;
1317                 } else {
1318                         /* Reset timeout value back to seconds */
1319                         wait = 10;
1320                 }
1321         }
1322
1323 }
1324
1325 /*****************************************************************************
1326  * mos7840_break
1327  *      this function sends a break to the port
1328  *****************************************************************************/
1329 static void mos7840_break(struct tty_struct *tty, int break_state)
1330 {
1331         struct usb_serial_port *port = tty->driver_data;
1332         unsigned char data;
1333         struct usb_serial *serial;
1334         struct moschip_port *mos7840_port;
1335
1336         dbg("%s", "Entering ...........");
1337         dbg("mos7840_break: Start");
1338
1339         if (mos7840_port_paranoia_check(port, __func__)) {
1340                 dbg("%s", "Port Paranoia failed");
1341                 return;
1342         }
1343
1344         serial = mos7840_get_usb_serial(port, __func__);
1345         if (!serial) {
1346                 dbg("%s", "Serial Paranoia failed");
1347                 return;
1348         }
1349
1350         mos7840_port = mos7840_get_port_private(port);
1351
1352         if (mos7840_port == NULL)
1353                 return;
1354
1355         if (serial->dev)
1356                 /* flush and block until tx is empty */
1357                 mos7840_block_until_chase_response(tty, mos7840_port);
1358
1359         if (break_state == -1)
1360                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1361         else
1362                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1363
1364         /* FIXME: no locking on shadowLCR anywhere in driver */
1365         mos7840_port->shadowLCR = data;
1366         dbg("mcs7840_break mos7840_port->shadowLCR is %x",
1367             mos7840_port->shadowLCR);
1368         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1369                              mos7840_port->shadowLCR);
1370
1371         return;
1372 }
1373
1374 /*****************************************************************************
1375  * mos7840_write_room
1376  *      this function is called by the tty driver when it wants to know how many
1377  *      bytes of data we can accept for a specific port.
1378  *      If successful, we return the amount of room that we have for this port
1379  *      Otherwise we return a negative error number.
1380  *****************************************************************************/
1381
1382 static int mos7840_write_room(struct tty_struct *tty)
1383 {
1384         struct usb_serial_port *port = tty->driver_data;
1385         int i;
1386         int room = 0;
1387         unsigned long flags;
1388         struct moschip_port *mos7840_port;
1389
1390         dbg("%s", " mos7840_write_room:entering ...........");
1391
1392         if (mos7840_port_paranoia_check(port, __func__)) {
1393                 dbg("%s", "Invalid port");
1394                 dbg("%s", " mos7840_write_room:leaving ...........");
1395                 return -1;
1396         }
1397
1398         mos7840_port = mos7840_get_port_private(port);
1399         if (mos7840_port == NULL) {
1400                 dbg("%s", "mos7840_break:leaving ...........");
1401                 return -1;
1402         }
1403
1404         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1405         for (i = 0; i < NUM_URBS; ++i) {
1406                 if (!mos7840_port->busy[i])
1407                         room += URB_TRANSFER_BUFFER_SIZE;
1408         }
1409         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1410
1411         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1412         dbg("%s - returns %d", __func__, room);
1413         return room;
1414
1415 }
1416
1417 /*****************************************************************************
1418  * mos7840_write
1419  *      this function is called by the tty driver when data should be written to
1420  *      the port.
1421  *      If successful, we return the number of bytes written, otherwise we
1422  *      return a negative error number.
1423  *****************************************************************************/
1424
1425 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1426                          const unsigned char *data, int count)
1427 {
1428         int status;
1429         int i;
1430         int bytes_sent = 0;
1431         int transfer_size;
1432         unsigned long flags;
1433
1434         struct moschip_port *mos7840_port;
1435         struct usb_serial *serial;
1436         struct urb *urb;
1437         /* __u16 Data; */
1438         const unsigned char *current_position = data;
1439         unsigned char *data1;
1440         dbg("%s", "entering ...........");
1441         /* dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1442                                         mos7840_port->shadowLCR); */
1443
1444 #ifdef NOTMOS7840
1445         Data = 0x00;
1446         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1447         mos7840_port->shadowLCR = Data;
1448         dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
1449         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1450             mos7840_port->shadowLCR);
1451
1452         /* Data = 0x03; */
1453         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1454         /* mos7840_port->shadowLCR=Data;//Need to add later */
1455
1456         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1457         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1458
1459         /* Data = 0x0c; */
1460         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1461         Data = 0x00;
1462         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1463         dbg("mos7840_write:DLL value is %x", Data);
1464
1465         Data = 0x0;
1466         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1467         dbg("mos7840_write:DLM value is %x", Data);
1468
1469         Data = Data & ~SERIAL_LCR_DLAB;
1470         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1471             mos7840_port->shadowLCR);
1472         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1473 #endif
1474
1475         if (mos7840_port_paranoia_check(port, __func__)) {
1476                 dbg("%s", "Port Paranoia failed");
1477                 return -1;
1478         }
1479
1480         serial = port->serial;
1481         if (mos7840_serial_paranoia_check(serial, __func__)) {
1482                 dbg("%s", "Serial Paranoia failed");
1483                 return -1;
1484         }
1485
1486         mos7840_port = mos7840_get_port_private(port);
1487         if (mos7840_port == NULL) {
1488                 dbg("%s", "mos7840_port is NULL");
1489                 return -1;
1490         }
1491
1492         /* try to find a free urb in the list */
1493         urb = NULL;
1494
1495         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1496         for (i = 0; i < NUM_URBS; ++i) {
1497                 if (!mos7840_port->busy[i]) {
1498                         mos7840_port->busy[i] = 1;
1499                         urb = mos7840_port->write_urb_pool[i];
1500                         dbg("URB:%d", i);
1501                         break;
1502                 }
1503         }
1504         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1505
1506         if (urb == NULL) {
1507                 dbg("%s - no more free urbs", __func__);
1508                 goto exit;
1509         }
1510
1511         if (urb->transfer_buffer == NULL) {
1512                 urb->transfer_buffer =
1513                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1514
1515                 if (urb->transfer_buffer == NULL) {
1516                         dev_err(&port->dev, "%s no more kernel memory...\n",
1517                                 __func__);
1518                         goto exit;
1519                 }
1520         }
1521         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1522
1523         memcpy(urb->transfer_buffer, current_position, transfer_size);
1524
1525         /* fill urb with data and submit  */
1526         usb_fill_bulk_urb(urb,
1527                           serial->dev,
1528                           usb_sndbulkpipe(serial->dev,
1529                                           port->bulk_out_endpointAddress),
1530                           urb->transfer_buffer,
1531                           transfer_size,
1532                           mos7840_bulk_out_data_callback, mos7840_port);
1533
1534         data1 = urb->transfer_buffer;
1535         dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
1536
1537         /* send it down the pipe */
1538         status = usb_submit_urb(urb, GFP_ATOMIC);
1539
1540         if (status) {
1541                 mos7840_port->busy[i] = 0;
1542                 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1543                         "with status = %d\n", __func__, status);
1544                 bytes_sent = status;
1545                 goto exit;
1546         }
1547         bytes_sent = transfer_size;
1548         mos7840_port->icount.tx += transfer_size;
1549         smp_wmb();
1550         dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
1551 exit:
1552         return bytes_sent;
1553
1554 }
1555
1556 /*****************************************************************************
1557  * mos7840_throttle
1558  *      this function is called by the tty driver when it wants to stop the data
1559  *      being read from the port.
1560  *****************************************************************************/
1561
1562 static void mos7840_throttle(struct tty_struct *tty)
1563 {
1564         struct usb_serial_port *port = tty->driver_data;
1565         struct moschip_port *mos7840_port;
1566         int status;
1567
1568         if (mos7840_port_paranoia_check(port, __func__)) {
1569                 dbg("%s", "Invalid port");
1570                 return;
1571         }
1572
1573         dbg("- port %d", port->number);
1574
1575         mos7840_port = mos7840_get_port_private(port);
1576
1577         if (mos7840_port == NULL)
1578                 return;
1579
1580         if (!mos7840_port->open) {
1581                 dbg("%s", "port not opened");
1582                 return;
1583         }
1584
1585         dbg("%s", "Entering ..........");
1586
1587         /* if we are implementing XON/XOFF, send the stop character */
1588         if (I_IXOFF(tty)) {
1589                 unsigned char stop_char = STOP_CHAR(tty);
1590                 status = mos7840_write(tty, port, &stop_char, 1);
1591                 if (status <= 0)
1592                         return;
1593         }
1594         /* if we are implementing RTS/CTS, toggle that line */
1595         if (tty->termios->c_cflag & CRTSCTS) {
1596                 mos7840_port->shadowMCR &= ~MCR_RTS;
1597                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1598                                          mos7840_port->shadowMCR);
1599                 if (status < 0)
1600                         return;
1601         }
1602
1603         return;
1604 }
1605
1606 /*****************************************************************************
1607  * mos7840_unthrottle
1608  *      this function is called by the tty driver when it wants to resume
1609  *      the data being read from the port (called after mos7840_throttle is
1610  *      called)
1611  *****************************************************************************/
1612 static void mos7840_unthrottle(struct tty_struct *tty)
1613 {
1614         struct usb_serial_port *port = tty->driver_data;
1615         int status;
1616         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1617
1618         if (mos7840_port_paranoia_check(port, __func__)) {
1619                 dbg("%s", "Invalid port");
1620                 return;
1621         }
1622
1623         if (mos7840_port == NULL)
1624                 return;
1625
1626         if (!mos7840_port->open) {
1627                 dbg("%s - port not opened", __func__);
1628                 return;
1629         }
1630
1631         dbg("%s", "Entering ..........");
1632
1633         /* if we are implementing XON/XOFF, send the start character */
1634         if (I_IXOFF(tty)) {
1635                 unsigned char start_char = START_CHAR(tty);
1636                 status = mos7840_write(tty, port, &start_char, 1);
1637                 if (status <= 0)
1638                         return;
1639         }
1640
1641         /* if we are implementing RTS/CTS, toggle that line */
1642         if (tty->termios->c_cflag & CRTSCTS) {
1643                 mos7840_port->shadowMCR |= MCR_RTS;
1644                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1645                                          mos7840_port->shadowMCR);
1646                 if (status < 0)
1647                         return;
1648         }
1649 }
1650
1651 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file)
1652 {
1653         struct usb_serial_port *port = tty->driver_data;
1654         struct moschip_port *mos7840_port;
1655         unsigned int result;
1656         __u16 msr;
1657         __u16 mcr;
1658         int status;
1659         mos7840_port = mos7840_get_port_private(port);
1660
1661         dbg("%s - port %d", __func__, port->number);
1662
1663         if (mos7840_port == NULL)
1664                 return -ENODEV;
1665
1666         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1667         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1668         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1669             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1670             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1671             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1672             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1673             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1674             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1675
1676         dbg("%s - 0x%04X", __func__, result);
1677
1678         return result;
1679 }
1680
1681 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file,
1682                             unsigned int set, unsigned int clear)
1683 {
1684         struct usb_serial_port *port = tty->driver_data;
1685         struct moschip_port *mos7840_port;
1686         unsigned int mcr;
1687         int status;
1688
1689         dbg("%s - port %d", __func__, port->number);
1690
1691         mos7840_port = mos7840_get_port_private(port);
1692
1693         if (mos7840_port == NULL)
1694                 return -ENODEV;
1695
1696         /* FIXME: What locks the port registers ? */
1697         mcr = mos7840_port->shadowMCR;
1698         if (clear & TIOCM_RTS)
1699                 mcr &= ~MCR_RTS;
1700         if (clear & TIOCM_DTR)
1701                 mcr &= ~MCR_DTR;
1702         if (clear & TIOCM_LOOP)
1703                 mcr &= ~MCR_LOOPBACK;
1704
1705         if (set & TIOCM_RTS)
1706                 mcr |= MCR_RTS;
1707         if (set & TIOCM_DTR)
1708                 mcr |= MCR_DTR;
1709         if (set & TIOCM_LOOP)
1710                 mcr |= MCR_LOOPBACK;
1711
1712         mos7840_port->shadowMCR = mcr;
1713
1714         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1715         if (status < 0) {
1716                 dbg("setting MODEM_CONTROL_REGISTER Failed");
1717                 return status;
1718         }
1719
1720         return 0;
1721 }
1722
1723 /*****************************************************************************
1724  * mos7840_calc_baud_rate_divisor
1725  *      this function calculates the proper baud rate divisor for the specified
1726  *      baud rate.
1727  *****************************************************************************/
1728 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1729                                           __u16 *clk_sel_val)
1730 {
1731
1732         dbg("%s - %d", __func__, baudRate);
1733
1734         if (baudRate <= 115200) {
1735                 *divisor = 115200 / baudRate;
1736                 *clk_sel_val = 0x0;
1737         }
1738         if ((baudRate > 115200) && (baudRate <= 230400)) {
1739                 *divisor = 230400 / baudRate;
1740                 *clk_sel_val = 0x10;
1741         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1742                 *divisor = 403200 / baudRate;
1743                 *clk_sel_val = 0x20;
1744         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1745                 *divisor = 460800 / baudRate;
1746                 *clk_sel_val = 0x30;
1747         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1748                 *divisor = 806400 / baudRate;
1749                 *clk_sel_val = 0x40;
1750         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1751                 *divisor = 921600 / baudRate;
1752                 *clk_sel_val = 0x50;
1753         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1754                 *divisor = 1572864 / baudRate;
1755                 *clk_sel_val = 0x60;
1756         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1757                 *divisor = 3145728 / baudRate;
1758                 *clk_sel_val = 0x70;
1759         }
1760         return 0;
1761
1762 #ifdef NOTMCS7840
1763
1764         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1765                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1766                         *divisor = mos7840_divisor_table[i].Divisor;
1767                         return 0;
1768                 }
1769         }
1770
1771         /* After trying for all the standard baud rates    *
1772          * Try calculating the divisor for this baud rate  */
1773
1774         if (baudrate > 75 && baudrate < 230400) {
1775                 /* get the divisor */
1776                 custom = (__u16) (230400L / baudrate);
1777
1778                 /* Check for round off */
1779                 round1 = (__u16) (2304000L / baudrate);
1780                 round = (__u16) (round1 - (custom * 10));
1781                 if (round > 4)
1782                         custom++;
1783                 *divisor = custom;
1784
1785                 dbg(" Baud %d = %d", baudrate, custom);
1786                 return 0;
1787         }
1788
1789         dbg("%s", " Baud calculation Failed...");
1790         return -1;
1791 #endif
1792 }
1793
1794 /*****************************************************************************
1795  * mos7840_send_cmd_write_baud_rate
1796  *      this function sends the proper command to change the baud rate of the
1797  *      specified port.
1798  *****************************************************************************/
1799
1800 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1801                                             int baudRate)
1802 {
1803         int divisor = 0;
1804         int status;
1805         __u16 Data;
1806         unsigned char number;
1807         __u16 clk_sel_val;
1808         struct usb_serial_port *port;
1809
1810         if (mos7840_port == NULL)
1811                 return -1;
1812
1813         port = (struct usb_serial_port *)mos7840_port->port;
1814         if (mos7840_port_paranoia_check(port, __func__)) {
1815                 dbg("%s", "Invalid port");
1816                 return -1;
1817         }
1818
1819         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1820                 dbg("%s", "Invalid Serial");
1821                 return -1;
1822         }
1823
1824         dbg("%s", "Entering ..........");
1825
1826         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1827
1828         dbg("%s - port = %d, baud = %d", __func__,
1829             mos7840_port->port->number, baudRate);
1830         /* reset clk_uart_sel in spregOffset */
1831         if (baudRate > 115200) {
1832 #ifdef HW_flow_control
1833                 /* NOTE: need to see the pther register to modify */
1834                 /* setting h/w flow control bit to 1 */
1835                 Data = 0x2b;
1836                 mos7840_port->shadowMCR = Data;
1837                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1838                                                                         Data);
1839                 if (status < 0) {
1840                         dbg("Writing spreg failed in set_serial_baud");
1841                         return -1;
1842                 }
1843 #endif
1844
1845         } else {
1846 #ifdef HW_flow_control
1847                 / *setting h/w flow control bit to 0 */
1848                 Data = 0xb;
1849                 mos7840_port->shadowMCR = Data;
1850                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1851                                                                         Data);
1852                 if (status < 0) {
1853                         dbg("Writing spreg failed in set_serial_baud");
1854                         return -1;
1855                 }
1856 #endif
1857
1858         }
1859
1860         if (1) {                /* baudRate <= 115200) */
1861                 clk_sel_val = 0x0;
1862                 Data = 0x0;
1863                 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1864                                                    &clk_sel_val);
1865                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1866                                                                  &Data);
1867                 if (status < 0) {
1868                         dbg("reading spreg failed in set_serial_baud");
1869                         return -1;
1870                 }
1871                 Data = (Data & 0x8f) | clk_sel_val;
1872                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1873                                                                 Data);
1874                 if (status < 0) {
1875                         dbg("Writing spreg failed in set_serial_baud");
1876                         return -1;
1877                 }
1878                 /* Calculate the Divisor */
1879
1880                 if (status) {
1881                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1882                         return status;
1883                 }
1884                 /* Enable access to divisor latch */
1885                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1886                 mos7840_port->shadowLCR = Data;
1887                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1888
1889                 /* Write the divisor */
1890                 Data = (unsigned char)(divisor & 0xff);
1891                 dbg("set_serial_baud Value to write DLL is %x", Data);
1892                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1893
1894                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1895                 dbg("set_serial_baud Value to write DLM is %x", Data);
1896                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1897
1898                 /* Disable access to divisor latch */
1899                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1900                 mos7840_port->shadowLCR = Data;
1901                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1902
1903         }
1904         return status;
1905 }
1906
1907 /*****************************************************************************
1908  * mos7840_change_port_settings
1909  *      This routine is called to set the UART on the device to match
1910  *      the specified new settings.
1911  *****************************************************************************/
1912
1913 static void mos7840_change_port_settings(struct tty_struct *tty,
1914         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1915 {
1916         int baud;
1917         unsigned cflag;
1918         unsigned iflag;
1919         __u8 lData;
1920         __u8 lParity;
1921         __u8 lStop;
1922         int status;
1923         __u16 Data;
1924         struct usb_serial_port *port;
1925         struct usb_serial *serial;
1926
1927         if (mos7840_port == NULL)
1928                 return;
1929
1930         port = (struct usb_serial_port *)mos7840_port->port;
1931
1932         if (mos7840_port_paranoia_check(port, __func__)) {
1933                 dbg("%s", "Invalid port");
1934                 return;
1935         }
1936
1937         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1938                 dbg("%s", "Invalid Serial");
1939                 return;
1940         }
1941
1942         serial = port->serial;
1943
1944         dbg("%s - port %d", __func__, mos7840_port->port->number);
1945
1946         if (!mos7840_port->open) {
1947                 dbg("%s - port not opened", __func__);
1948                 return;
1949         }
1950
1951         dbg("%s", "Entering ..........");
1952
1953         lData = LCR_BITS_8;
1954         lStop = LCR_STOP_1;
1955         lParity = LCR_PAR_NONE;
1956
1957         cflag = tty->termios->c_cflag;
1958         iflag = tty->termios->c_iflag;
1959
1960         /* Change the number of bits */
1961         if (cflag & CSIZE) {
1962                 switch (cflag & CSIZE) {
1963                 case CS5:
1964                         lData = LCR_BITS_5;
1965                         break;
1966
1967                 case CS6:
1968                         lData = LCR_BITS_6;
1969                         break;
1970
1971                 case CS7:
1972                         lData = LCR_BITS_7;
1973                         break;
1974                 default:
1975                 case CS8:
1976                         lData = LCR_BITS_8;
1977                         break;
1978                 }
1979         }
1980         /* Change the Parity bit */
1981         if (cflag & PARENB) {
1982                 if (cflag & PARODD) {
1983                         lParity = LCR_PAR_ODD;
1984                         dbg("%s - parity = odd", __func__);
1985                 } else {
1986                         lParity = LCR_PAR_EVEN;
1987                         dbg("%s - parity = even", __func__);
1988                 }
1989
1990         } else {
1991                 dbg("%s - parity = none", __func__);
1992         }
1993
1994         if (cflag & CMSPAR)
1995                 lParity = lParity | 0x20;
1996
1997         /* Change the Stop bit */
1998         if (cflag & CSTOPB) {
1999                 lStop = LCR_STOP_2;
2000                 dbg("%s - stop bits = 2", __func__);
2001         } else {
2002                 lStop = LCR_STOP_1;
2003                 dbg("%s - stop bits = 1", __func__);
2004         }
2005
2006         /* Update the LCR with the correct value */
2007         mos7840_port->shadowLCR &=
2008             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
2009         mos7840_port->shadowLCR |= (lData | lParity | lStop);
2010
2011         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
2012             mos7840_port->shadowLCR);
2013         /* Disable Interrupts */
2014         Data = 0x00;
2015         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2016
2017         Data = 0x00;
2018         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2019
2020         Data = 0xcf;
2021         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2022
2023         /* Send the updated LCR value to the mos7840 */
2024         Data = mos7840_port->shadowLCR;
2025
2026         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2027
2028         Data = 0x00b;
2029         mos7840_port->shadowMCR = Data;
2030         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2031         Data = 0x00b;
2032         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2033
2034         /* set up the MCR register and send it to the mos7840 */
2035
2036         mos7840_port->shadowMCR = MCR_MASTER_IE;
2037         if (cflag & CBAUD)
2038                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2039
2040         if (cflag & CRTSCTS)
2041                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2042         else
2043                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2044
2045         Data = mos7840_port->shadowMCR;
2046         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2047
2048         /* Determine divisor based on baud rate */
2049         baud = tty_get_baud_rate(tty);
2050
2051         if (!baud) {
2052                 /* pick a default, any default... */
2053                 dbg("%s", "Picked default baud...");
2054                 baud = 9600;
2055         }
2056
2057         dbg("%s - baud rate = %d", __func__, baud);
2058         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2059
2060         /* Enable Interrupts */
2061         Data = 0x0c;
2062         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2063
2064         if (mos7840_port->read_urb_busy == false) {
2065                 mos7840_port->read_urb->dev = serial->dev;
2066                 mos7840_port->read_urb_busy = true;
2067                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2068                 if (status) {
2069                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2070                             status);
2071                         mos7840_port->read_urb_busy = false;
2072                 }
2073         }
2074         wake_up(&mos7840_port->delta_msr_wait);
2075         mos7840_port->delta_msr_cond = 1;
2076         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
2077             mos7840_port->shadowLCR);
2078
2079         return;
2080 }
2081
2082 /*****************************************************************************
2083  * mos7840_set_termios
2084  *      this function is called by the tty driver when it wants to change
2085  *      the termios structure
2086  *****************************************************************************/
2087
2088 static void mos7840_set_termios(struct tty_struct *tty,
2089                                 struct usb_serial_port *port,
2090                                 struct ktermios *old_termios)
2091 {
2092         int status;
2093         unsigned int cflag;
2094         struct usb_serial *serial;
2095         struct moschip_port *mos7840_port;
2096         dbg("mos7840_set_termios: START");
2097         if (mos7840_port_paranoia_check(port, __func__)) {
2098                 dbg("%s", "Invalid port");
2099                 return;
2100         }
2101
2102         serial = port->serial;
2103
2104         if (mos7840_serial_paranoia_check(serial, __func__)) {
2105                 dbg("%s", "Invalid Serial");
2106                 return;
2107         }
2108
2109         mos7840_port = mos7840_get_port_private(port);
2110
2111         if (mos7840_port == NULL)
2112                 return;
2113
2114         if (!mos7840_port->open) {
2115                 dbg("%s - port not opened", __func__);
2116                 return;
2117         }
2118
2119         dbg("%s", "setting termios - ");
2120
2121         cflag = tty->termios->c_cflag;
2122
2123         dbg("%s - clfag %08x iflag %08x", __func__,
2124             tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2125         dbg("%s - old clfag %08x old iflag %08x", __func__,
2126             old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2127         dbg("%s - port %d", __func__, port->number);
2128
2129         /* change the port settings to the new ones specified */
2130
2131         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2132
2133         if (!mos7840_port->read_urb) {
2134                 dbg("%s", "URB KILLED !!!!!");
2135                 return;
2136         }
2137
2138         if (mos7840_port->read_urb_busy == false) {
2139                 mos7840_port->read_urb->dev = serial->dev;
2140                 mos7840_port->read_urb_busy = true;
2141                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2142                 if (status) {
2143                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2144                             status);
2145                         mos7840_port->read_urb_busy = false;
2146                 }
2147         }
2148         return;
2149 }
2150
2151 /*****************************************************************************
2152  * mos7840_get_lsr_info - get line status register info
2153  *
2154  * Purpose: Let user call ioctl() to get info when the UART physically
2155  *          is emptied.  On bus types like RS485, the transmitter must
2156  *          release the bus after transmitting. This must be done when
2157  *          the transmit shift register is empty, not be done when the
2158  *          transmit holding register is empty.  This functionality
2159  *          allows an RS485 driver to be written in user space.
2160  *****************************************************************************/
2161
2162 static int mos7840_get_lsr_info(struct tty_struct *tty,
2163                                 unsigned int __user *value)
2164 {
2165         int count;
2166         unsigned int result = 0;
2167
2168         count = mos7840_chars_in_buffer(tty);
2169         if (count == 0) {
2170                 dbg("%s -- Empty", __func__);
2171                 result = TIOCSER_TEMT;
2172         }
2173
2174         if (copy_to_user(value, &result, sizeof(int)))
2175                 return -EFAULT;
2176         return 0;
2177 }
2178
2179 /*****************************************************************************
2180  * mos7840_get_serial_info
2181  *      function to get information about serial port
2182  *****************************************************************************/
2183
2184 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2185                                    struct serial_struct __user *retinfo)
2186 {
2187         struct serial_struct tmp;
2188
2189         if (mos7840_port == NULL)
2190                 return -1;
2191
2192         if (!retinfo)
2193                 return -EFAULT;
2194
2195         memset(&tmp, 0, sizeof(tmp));
2196
2197         tmp.type = PORT_16550A;
2198         tmp.line = mos7840_port->port->serial->minor;
2199         tmp.port = mos7840_port->port->number;
2200         tmp.irq = 0;
2201         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2202         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2203         tmp.baud_base = 9600;
2204         tmp.close_delay = 5 * HZ;
2205         tmp.closing_wait = 30 * HZ;
2206
2207         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2208                 return -EFAULT;
2209         return 0;
2210 }
2211
2212 /*****************************************************************************
2213  * SerialIoctl
2214  *      this function handles any ioctl calls to the driver
2215  *****************************************************************************/
2216
2217 static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
2218                          unsigned int cmd, unsigned long arg)
2219 {
2220         struct usb_serial_port *port = tty->driver_data;
2221         void __user *argp = (void __user *)arg;
2222         struct moschip_port *mos7840_port;
2223
2224         struct async_icount cnow;
2225         struct async_icount cprev;
2226         struct serial_icounter_struct icount;
2227
2228         if (mos7840_port_paranoia_check(port, __func__)) {
2229                 dbg("%s", "Invalid port");
2230                 return -1;
2231         }
2232
2233         mos7840_port = mos7840_get_port_private(port);
2234
2235         if (mos7840_port == NULL)
2236                 return -1;
2237
2238         dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2239
2240         switch (cmd) {
2241                 /* return number of bytes available */
2242
2243         case TIOCSERGETLSR:
2244                 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2245                 return mos7840_get_lsr_info(tty, argp);
2246                 return 0;
2247
2248         case TIOCGSERIAL:
2249                 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2250                 return mos7840_get_serial_info(mos7840_port, argp);
2251
2252         case TIOCSSERIAL:
2253                 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2254                 break;
2255
2256         case TIOCMIWAIT:
2257                 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2258                 cprev = mos7840_port->icount;
2259                 while (1) {
2260                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2261                         mos7840_port->delta_msr_cond = 0;
2262                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2263                                                  (mos7840_port->
2264                                                   delta_msr_cond == 1));
2265
2266                         /* see if a signal did it */
2267                         if (signal_pending(current))
2268                                 return -ERESTARTSYS;
2269                         cnow = mos7840_port->icount;
2270                         smp_rmb();
2271                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2272                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2273                                 return -EIO;    /* no change => error */
2274                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2275                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2276                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2277                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2278                                 return 0;
2279                         }
2280                         cprev = cnow;
2281                 }
2282                 /* NOTREACHED */
2283                 break;
2284
2285         case TIOCGICOUNT:
2286                 cnow = mos7840_port->icount;
2287                 smp_rmb();
2288
2289                 memset(&icount, 0, sizeof(struct serial_icounter_struct));
2290
2291                 icount.cts = cnow.cts;
2292                 icount.dsr = cnow.dsr;
2293                 icount.rng = cnow.rng;
2294                 icount.dcd = cnow.dcd;
2295                 icount.rx = cnow.rx;
2296                 icount.tx = cnow.tx;
2297                 icount.frame = cnow.frame;
2298                 icount.overrun = cnow.overrun;
2299                 icount.parity = cnow.parity;
2300                 icount.brk = cnow.brk;
2301                 icount.buf_overrun = cnow.buf_overrun;
2302
2303                 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2304                     port->number, icount.rx, icount.tx);
2305                 if (copy_to_user(argp, &icount, sizeof(icount)))
2306                         return -EFAULT;
2307                 return 0;
2308         default:
2309                 break;
2310         }
2311         return -ENOIOCTLCMD;
2312 }
2313
2314 static int mos7840_calc_num_ports(struct usb_serial *serial)
2315 {
2316         int mos7840_num_ports = 0;
2317
2318         dbg("numberofendpoints: cur %d, alt %d",
2319             (int)serial->interface->cur_altsetting->desc.bNumEndpoints,
2320             (int)serial->interface->altsetting->desc.bNumEndpoints);
2321         if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2322                 mos7840_num_ports = serial->num_ports = 2;
2323         } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2324                 serial->num_bulk_in = 4;
2325                 serial->num_bulk_out = 4;
2326                 mos7840_num_ports = serial->num_ports = 4;
2327         }
2328         dbg ("mos7840_num_ports = %d", mos7840_num_ports);
2329         return mos7840_num_ports;
2330 }
2331
2332 /****************************************************************************
2333  * mos7840_startup
2334  ****************************************************************************/
2335
2336 static int mos7840_startup(struct usb_serial *serial)
2337 {
2338         struct moschip_port *mos7840_port;
2339         struct usb_device *dev;
2340         int i, status;
2341
2342         __u16 Data;
2343         dbg("%s", "mos7840_startup :Entering..........");
2344
2345         if (!serial) {
2346                 dbg("%s", "Invalid Handler");
2347                 return -1;
2348         }
2349
2350         dev = serial->dev;
2351
2352         dbg("%s", "Entering...");
2353         dbg ("mos7840_startup: serial = %p", serial);
2354
2355         /* we set up the pointers to the endpoints in the mos7840_open *
2356          * function, as the structures aren't created yet.             */
2357
2358         /* set up port private structures */
2359         for (i = 0; i < serial->num_ports; ++i) {
2360                 dbg ("mos7840_startup: configuring port %d............", i);
2361                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2362                 if (mos7840_port == NULL) {
2363                         dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2364                         status = -ENOMEM;
2365                         i--; /* don't follow NULL pointer cleaning up */
2366                         goto error;
2367                 }
2368
2369                 /* Initialize all port interrupt end point to port 0 int
2370                  * endpoint. Our device has only one interrupt end point
2371                  * common to all port */
2372
2373                 mos7840_port->port = serial->port[i];
2374                 mos7840_set_port_private(serial->port[i], mos7840_port);
2375                 spin_lock_init(&mos7840_port->pool_lock);
2376
2377                 /* minor is not initialised until later by
2378                  * usb-serial.c:get_free_serial() and cannot therefore be used
2379                  * to index device instances */
2380                 mos7840_port->port_num = i + 1;
2381                 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2382                 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2383                 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2384                 dbg ("serial->minor = %d", serial->minor);
2385
2386                 if (mos7840_port->port_num == 1) {
2387                         mos7840_port->SpRegOffset = 0x0;
2388                         mos7840_port->ControlRegOffset = 0x1;
2389                         mos7840_port->DcrRegOffset = 0x4;
2390                 } else if ((mos7840_port->port_num == 2)
2391                            && (serial->num_ports == 4)) {
2392                         mos7840_port->SpRegOffset = 0x8;
2393                         mos7840_port->ControlRegOffset = 0x9;
2394                         mos7840_port->DcrRegOffset = 0x16;
2395                 } else if ((mos7840_port->port_num == 2)
2396                            && (serial->num_ports == 2)) {
2397                         mos7840_port->SpRegOffset = 0xa;
2398                         mos7840_port->ControlRegOffset = 0xb;
2399                         mos7840_port->DcrRegOffset = 0x19;
2400                 } else if ((mos7840_port->port_num == 3)
2401                            && (serial->num_ports == 4)) {
2402                         mos7840_port->SpRegOffset = 0xa;
2403                         mos7840_port->ControlRegOffset = 0xb;
2404                         mos7840_port->DcrRegOffset = 0x19;
2405                 } else if ((mos7840_port->port_num == 4)
2406                            && (serial->num_ports == 4)) {
2407                         mos7840_port->SpRegOffset = 0xc;
2408                         mos7840_port->ControlRegOffset = 0xd;
2409                         mos7840_port->DcrRegOffset = 0x1c;
2410                 }
2411                 mos7840_dump_serial_port(mos7840_port);
2412                 mos7840_set_port_private(serial->port[i], mos7840_port);
2413
2414                 /* enable rx_disable bit in control register */
2415                 status = mos7840_get_reg_sync(serial->port[i],
2416                                  mos7840_port->ControlRegOffset, &Data);
2417                 if (status < 0) {
2418                         dbg("Reading ControlReg failed status-0x%x", status);
2419                         break;
2420                 } else
2421                         dbg("ControlReg Reading success val is %x, status%d",
2422                             Data, status);
2423                 Data |= 0x08;   /* setting driver done bit */
2424                 Data |= 0x04;   /* sp1_bit to have cts change reflect in
2425                                    modem status reg */
2426
2427                 /* Data |= 0x20; //rx_disable bit */
2428                 status = mos7840_set_reg_sync(serial->port[i],
2429                                          mos7840_port->ControlRegOffset, Data);
2430                 if (status < 0) {
2431                         dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
2432                         break;
2433                 } else
2434                         dbg("ControlReg Writing success(rx_disable) status%d",
2435                             status);
2436
2437                 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2438                    and 0x24 in DCR3 */
2439                 Data = 0x01;
2440                 status = mos7840_set_reg_sync(serial->port[i],
2441                          (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2442                 if (status < 0) {
2443                         dbg("Writing DCR0 failed status-0x%x", status);
2444                         break;
2445                 } else
2446                         dbg("DCR0 Writing success status%d", status);
2447
2448                 Data = 0x05;
2449                 status = mos7840_set_reg_sync(serial->port[i],
2450                          (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2451                 if (status < 0) {
2452                         dbg("Writing DCR1 failed status-0x%x", status);
2453                         break;
2454                 } else
2455                         dbg("DCR1 Writing success status%d", status);
2456
2457                 Data = 0x24;
2458                 status = mos7840_set_reg_sync(serial->port[i],
2459                          (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2460                 if (status < 0) {
2461                         dbg("Writing DCR2 failed status-0x%x", status);
2462                         break;
2463                 } else
2464                         dbg("DCR2 Writing success status%d", status);
2465
2466                 /* write values in clkstart0x0 and clkmulti 0x20 */
2467                 Data = 0x0;
2468                 status = mos7840_set_reg_sync(serial->port[i],
2469                                          CLK_START_VALUE_REGISTER, Data);
2470                 if (status < 0) {
2471                         dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
2472                         break;
2473                 } else
2474                         dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
2475
2476                 Data = 0x20;
2477                 status = mos7840_set_reg_sync(serial->port[i],
2478                                         CLK_MULTI_REGISTER, Data);
2479                 if (status < 0) {
2480                         dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
2481                             status);
2482                         goto error;
2483                 } else
2484                         dbg("CLK_MULTI_REGISTER Writing success status%d",
2485                             status);
2486
2487                 /* write value 0x0 to scratchpad register */
2488                 Data = 0x00;
2489                 status = mos7840_set_uart_reg(serial->port[i],
2490                                                 SCRATCH_PAD_REGISTER, Data);
2491                 if (status < 0) {
2492                         dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
2493                             status);
2494                         break;
2495                 } else
2496                         dbg("SCRATCH_PAD_REGISTER Writing success status%d",
2497                             status);
2498
2499                 /* Zero Length flag register */
2500                 if ((mos7840_port->port_num != 1)
2501                     && (serial->num_ports == 2)) {
2502
2503                         Data = 0xff;
2504                         status = mos7840_set_reg_sync(serial->port[i],
2505                                       (__u16) (ZLP_REG1 +
2506                                       ((__u16)mos7840_port->port_num)), Data);
2507                         dbg("ZLIP offset %x",
2508                             (__u16) (ZLP_REG1 +
2509                                         ((__u16) mos7840_port->port_num)));
2510                         if (status < 0) {
2511                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2512                                     i + 2, status);
2513                                 break;
2514                         } else
2515                                 dbg("ZLP_REG%d Writing success status%d",
2516                                     i + 2, status);
2517                 } else {
2518                         Data = 0xff;
2519                         status = mos7840_set_reg_sync(serial->port[i],
2520                               (__u16) (ZLP_REG1 +
2521                               ((__u16)mos7840_port->port_num) - 0x1), Data);
2522                         dbg("ZLIP offset %x",
2523                             (__u16) (ZLP_REG1 +
2524                                      ((__u16) mos7840_port->port_num) - 0x1));
2525                         if (status < 0) {
2526                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2527                                     i + 1, status);
2528                                 break;
2529                         } else
2530                                 dbg("ZLP_REG%d Writing success status%d",
2531                                     i + 1, status);
2532
2533                 }
2534                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2535                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2536                 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2537                                                                 GFP_KERNEL);
2538                 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2539                                                         !mos7840_port->dr) {
2540                         status = -ENOMEM;
2541                         goto error;
2542                 }
2543         }
2544         dbg ("mos7840_startup: all ports configured...........");
2545
2546         /* Zero Length flag enable */
2547         Data = 0x0f;
2548         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2549         if (status < 0) {
2550                 dbg("Writing ZLP_REG5 failed status-0x%x", status);
2551                 goto error;
2552         } else
2553                 dbg("ZLP_REG5 Writing success status%d", status);
2554
2555         /* setting configuration feature to one */
2556         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2557                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2558         return 0;
2559 error:
2560         for (/* nothing */; i >= 0; i--) {
2561                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2562
2563                 kfree(mos7840_port->dr);
2564                 kfree(mos7840_port->ctrl_buf);
2565                 usb_free_urb(mos7840_port->control_urb);
2566                 kfree(mos7840_port);
2567                 serial->port[i] = NULL;
2568         }
2569         return status;
2570 }
2571
2572 /****************************************************************************
2573  * mos7840_disconnect
2574  *      This function is called whenever the device is removed from the usb bus.
2575  ****************************************************************************/
2576
2577 static void mos7840_disconnect(struct usb_serial *serial)
2578 {
2579         int i;
2580         unsigned long flags;
2581         struct moschip_port *mos7840_port;
2582         dbg("%s", " disconnect :entering..........");
2583
2584         if (!serial) {
2585                 dbg("%s", "Invalid Handler");
2586                 return;
2587         }
2588
2589         /* check for the ports to be closed,close the ports and disconnect */
2590
2591         /* free private structure allocated for serial port  *
2592          * stop reads and writes on all ports                */
2593
2594         for (i = 0; i < serial->num_ports; ++i) {
2595                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2596                 dbg ("mos7840_port %d = %p", i, mos7840_port);
2597                 if (mos7840_port) {
2598                         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2599                         mos7840_port->zombie = 1;
2600                         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2601                         usb_kill_urb(mos7840_port->control_urb);
2602                 }
2603         }
2604
2605         dbg("%s", "Thank u :: ");
2606
2607 }
2608
2609 /****************************************************************************
2610  * mos7840_release
2611  *      This function is called when the usb_serial structure is freed.
2612  ****************************************************************************/
2613
2614 static void mos7840_release(struct usb_serial *serial)
2615 {
2616         int i;
2617         struct moschip_port *mos7840_port;
2618         dbg("%s", " release :entering..........");
2619
2620         if (!serial) {
2621                 dbg("%s", "Invalid Handler");
2622                 return;
2623         }
2624
2625         /* check for the ports to be closed,close the ports and disconnect */
2626
2627         /* free private structure allocated for serial port  *
2628          * stop reads and writes on all ports                */
2629
2630         for (i = 0; i < serial->num_ports; ++i) {
2631                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2632                 dbg("mos7840_port %d = %p", i, mos7840_port);
2633                 if (mos7840_port) {
2634                         kfree(mos7840_port->ctrl_buf);
2635                         kfree(mos7840_port->dr);
2636                         kfree(mos7840_port);
2637                 }
2638         }
2639
2640         dbg("%s", "Thank u :: ");
2641
2642 }
2643
2644 static struct usb_driver io_driver = {
2645         .name = "mos7840",
2646         .probe = usb_serial_probe,
2647         .disconnect = usb_serial_disconnect,
2648         .id_table = moschip_id_table_combined,
2649         .no_dynamic_id = 1,
2650 };
2651
2652 static struct usb_serial_driver moschip7840_4port_device = {
2653         .driver = {
2654                    .owner = THIS_MODULE,
2655                    .name = "mos7840",
2656                    },
2657         .description = DRIVER_DESC,
2658         .usb_driver = &io_driver,
2659         .id_table = moschip_port_id_table,
2660         .num_ports = 4,
2661         .open = mos7840_open,
2662         .close = mos7840_close,
2663         .write = mos7840_write,
2664         .write_room = mos7840_write_room,
2665         .chars_in_buffer = mos7840_chars_in_buffer,
2666         .throttle = mos7840_throttle,
2667         .unthrottle = mos7840_unthrottle,
2668         .calc_num_ports = mos7840_calc_num_ports,
2669 #ifdef MCSSerialProbe
2670         .probe = mos7840_serial_probe,
2671 #endif
2672         .ioctl = mos7840_ioctl,
2673         .set_termios = mos7840_set_termios,
2674         .break_ctl = mos7840_break,
2675         .tiocmget = mos7840_tiocmget,
2676         .tiocmset = mos7840_tiocmset,
2677         .attach = mos7840_startup,
2678         .disconnect = mos7840_disconnect,
2679         .release = mos7840_release,
2680         .read_bulk_callback = mos7840_bulk_in_callback,
2681         .read_int_callback = mos7840_interrupt_callback,
2682 };
2683
2684 /****************************************************************************
2685  * moschip7840_init
2686  *      This is called by the module subsystem, or on startup to initialize us
2687  ****************************************************************************/
2688 static int __init moschip7840_init(void)
2689 {
2690         int retval;
2691
2692         dbg("%s", " mos7840_init :entering..........");
2693
2694         /* Register with the usb serial */
2695         retval = usb_serial_register(&moschip7840_4port_device);
2696
2697         if (retval)
2698                 goto failed_port_device_register;
2699
2700         dbg("%s", "Entering...");
2701         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2702                DRIVER_DESC "\n");
2703
2704         /* Register with the usb */
2705         retval = usb_register(&io_driver);
2706         if (retval == 0) {
2707                 dbg("%s", "Leaving...");
2708                 return 0;
2709         }
2710         usb_serial_deregister(&moschip7840_4port_device);
2711 failed_port_device_register:
2712         return retval;
2713 }
2714
2715 /****************************************************************************
2716  * moschip7840_exit
2717  *      Called when the driver is about to be unloaded.
2718  ****************************************************************************/
2719 static void __exit moschip7840_exit(void)
2720 {
2721
2722         dbg("%s", " mos7840_exit :entering..........");
2723
2724         usb_deregister(&io_driver);
2725
2726         usb_serial_deregister(&moschip7840_4port_device);
2727
2728         dbg("%s", "Entering...");
2729 }
2730
2731 module_init(moschip7840_init);
2732 module_exit(moschip7840_exit);
2733
2734 /* Module information */
2735 MODULE_DESCRIPTION(DRIVER_DESC);
2736 MODULE_LICENSE("GPL");
2737
2738 module_param(debug, bool, S_IRUGO | S_IWUSR);
2739 MODULE_PARM_DESC(debug, "Debug enabled or not");