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_busy = true;
 796         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 797
 798         if (retval) {
 799                 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
 800                 mos7840_port->read_urb_busy = false;
 801         }
 802 }
 803
 804 /*****************************************************************************
 805  * mos7840_bulk_out_data_callback
 806  *      this is the callback function for when we have finished sending
 807  *      serial data on the bulk out endpoint.
 808  *****************************************************************************/
 809
 810 static void mos7840_bulk_out_data_callback(struct urb *urb)
 811 {
 812         struct moschip_port *mos7840_port;
 813         struct tty_struct *tty;
 814         int status = urb->status;
 815         int i;
 816
 817         mos7840_port = urb->context;
 818         spin_lock(&mos7840_port->pool_lock);
 819         for (i = 0; i < NUM_URBS; i++) {
 820                 if (urb == mos7840_port->write_urb_pool[i]) {
 821                         mos7840_port->busy[i] = 0;
 822                         break;
 823                 }
 824         }
 825         spin_unlock(&mos7840_port->pool_lock);
 826
 827         if (status) {
 828                 dbg("nonzero write bulk status received:%d", status);
 829                 return;
 830         }
 831
 832         if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
 833                 dbg("%s", "Port Paranoia failed");
 834                 return;
 835         }
 836
 837         dbg("%s", "Entering .........");
 838
 839         tty = tty_port_tty_get(&mos7840_port->port->port);
 840         if (tty && mos7840_port->open)
 841                 tty_wakeup(tty);
 842         tty_kref_put(tty);
 843
 844 }
 845
 846 /************************************************************************/
 847 /*       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       */
 848 /************************************************************************/
 849 #ifdef MCSSerialProbe
 850 static int mos7840_serial_probe(struct usb_serial *serial,
 851                                 const struct usb_device_id *id)
 852 {
 853
 854         /*need to implement the mode_reg reading and updating\
 855            structures usb_serial_ device_type\
 856            (i.e num_ports, num_bulkin,bulkout etc) */
 857         /* Also we can update the changes  attach */
 858         return 1;
 859 }
 860 #endif
 861
 862 /*****************************************************************************
 863  * mos7840_open
 864  *      this function is called by the tty driver when a port is opened
 865  *      If successful, we return 0
 866  *      Otherwise we return a negative error number.
 867  *****************************************************************************/
 868
 869 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
 870 {
 871         int response;
 872         int j;
 873         struct usb_serial *serial;
 874         struct urb *urb;
 875         __u16 Data;
 876         int status;
 877         struct moschip_port *mos7840_port;
 878         struct moschip_port *port0;
 879
 880         dbg ("%s enter", __func__);
 881
 882         if (mos7840_port_paranoia_check(port, __func__)) {
 883                 dbg("%s", "Port Paranoia failed");
 884                 return -ENODEV;
 885         }
 886
 887         serial = port->serial;
 888
 889         if (mos7840_serial_paranoia_check(serial, __func__)) {
 890                 dbg("%s", "Serial Paranoia failed");
 891                 return -ENODEV;
 892         }
 893
 894         mos7840_port = mos7840_get_port_private(port);
 895         port0 = mos7840_get_port_private(serial->port[0]);
 896
 897         if (mos7840_port == NULL || port0 == NULL)
 898                 return -ENODEV;
 899
 900         usb_clear_halt(serial->dev, port->write_urb->pipe);
 901         usb_clear_halt(serial->dev, port->read_urb->pipe);
 902         port0->open_ports++;
 903
 904         /* Initialising the write urb pool */
 905         for (j = 0; j < NUM_URBS; ++j) {
 906                 urb = usb_alloc_urb(0, GFP_KERNEL);
 907                 mos7840_port->write_urb_pool[j] = urb;
 908
 909                 if (urb == NULL) {
 910                         dev_err(&port->dev, "No more urbs???\n");
 911                         continue;
 912                 }
 913
 914                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 915                                                                 GFP_KERNEL);
 916                 if (!urb->transfer_buffer) {
 917                         usb_free_urb(urb);
 918                         mos7840_port->write_urb_pool[j] = NULL;
 919                         dev_err(&port->dev,
 920                                 "%s-out of memory for urb buffers.\n",
 921                                 __func__);
 922                         continue;
 923                 }
 924         }
 925
 926 /*****************************************************************************
 927  * Initialize MCS7840 -- Write Init values to corresponding Registers
 928  *
 929  * Register Index
 930  * 1 : IER
 931  * 2 : FCR
 932  * 3 : LCR
 933  * 4 : MCR
 934  *
 935  * 0x08 : SP1/2 Control Reg
 936  *****************************************************************************/
 937
 938         /* NEED to check the following Block */
 939
 940         Data = 0x0;
 941         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 942         if (status < 0) {
 943                 dbg("Reading Spreg failed");
 944                 return -1;
 945         }
 946         Data |= 0x80;
 947         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 948         if (status < 0) {
 949                 dbg("writing Spreg failed");
 950                 return -1;
 951         }
 952
 953         Data &= ~0x80;
 954         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 955         if (status < 0) {
 956                 dbg("writing Spreg failed");
 957                 return -1;
 958         }
 959         /* End of block to be checked */
 960
 961         Data = 0x0;
 962         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 963                                                                         &Data);
 964         if (status < 0) {
 965                 dbg("Reading Controlreg failed");
 966                 return -1;
 967         }
 968         Data |= 0x08;           /* Driver done bit */
 969         Data |= 0x20;           /* rx_disable */
 970         status = mos7840_set_reg_sync(port,
 971                                 mos7840_port->ControlRegOffset, Data);
 972         if (status < 0) {
 973                 dbg("writing Controlreg failed");
 974                 return -1;
 975         }
 976         /* do register settings here */
 977         /* Set all regs to the device default values. */
 978         /***********************************
 979          * First Disable all interrupts.
 980          ***********************************/
 981         Data = 0x00;
 982         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 983         if (status < 0) {
 984                 dbg("disabling interrupts failed");
 985                 return -1;
 986         }
 987         /* Set FIFO_CONTROL_REGISTER to the default value */
 988         Data = 0x00;
 989         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 990         if (status < 0) {
 991                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
 992                 return -1;
 993         }
 994
 995         Data = 0xcf;
 996         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 997         if (status < 0) {
 998                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
 999                 return -1;
1000         }
1001
1002         Data = 0x03;
1003         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1004         mos7840_port->shadowLCR = Data;
1005
1006         Data = 0x0b;
1007         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1008         mos7840_port->shadowMCR = Data;
1009
1010         Data = 0x00;
1011         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1012         mos7840_port->shadowLCR = Data;
1013
1014         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1015         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1016
1017         Data = 0x0c;
1018         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1019
1020         Data = 0x0;
1021         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1022
1023         Data = 0x00;
1024         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1025
1026         Data = Data & ~SERIAL_LCR_DLAB;
1027         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1028         mos7840_port->shadowLCR = Data;
1029
1030         /* clearing Bulkin and Bulkout Fifo */
1031         Data = 0x0;
1032         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1033
1034         Data = Data | 0x0c;
1035         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1036
1037         Data = Data & ~0x0c;
1038         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1039         /* Finally enable all interrupts */
1040         Data = 0x0c;
1041         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1042
1043         /* clearing rx_disable */
1044         Data = 0x0;
1045         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1046                                                                         &Data);
1047         Data = Data & ~0x20;
1048         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1049                                                                         Data);
1050
1051         /* rx_negate */
1052         Data = 0x0;
1053         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1054                                                                         &Data);
1055         Data = Data | 0x10;
1056         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1057                                                                         Data);
1058
1059         /* Check to see if we've set up our endpoint info yet    *
1060          * (can't set it up in mos7840_startup as the structures *
1061          * were not set up at that time.)                        */
1062         if (port0->open_ports == 1) {
1063                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1064                         /* set up interrupt urb */
1065                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1066                                 serial->dev,
1067                                 usb_rcvintpipe(serial->dev,
1068                                 serial->port[0]->interrupt_in_endpointAddress),
1069                                 serial->port[0]->interrupt_in_buffer,
1070                                 serial->port[0]->interrupt_in_urb->
1071                                 transfer_buffer_length,
1072                                 mos7840_interrupt_callback,
1073                                 serial,
1074                                 serial->port[0]->interrupt_in_urb->interval);
1075
1076                         /* start interrupt read for mos7840               *
1077                          * will continue as long as mos7840 is connected  */
1078
1079                         response =
1080                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1081                                            GFP_KERNEL);
1082                         if (response) {
1083                                 dev_err(&port->dev, "%s - Error %d submitting "
1084                                         "interrupt urb\n", __func__, response);
1085                         }
1086
1087                 }
1088
1089         }
1090
1091         /* see if we've set up our endpoint info yet   *
1092          * (can't set it up in mos7840_startup as the  *
1093          * structures were not set up at that time.)   */
1094
1095         dbg("port number is %d", port->number);
1096         dbg("serial number is %d", port->serial->minor);
1097         dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
1098         dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
1099         dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
1100         dbg("port's number in the device is %d", mos7840_port->port_num);
1101         mos7840_port->read_urb = port->read_urb;
1102
1103         /* set up our bulk in urb */
1104
1105         usb_fill_bulk_urb(mos7840_port->read_urb,
1106                           serial->dev,
1107                           usb_rcvbulkpipe(serial->dev,
1108                                           port->bulk_in_endpointAddress),
1109                           port->bulk_in_buffer,
1110                           mos7840_port->read_urb->transfer_buffer_length,
1111                           mos7840_bulk_in_callback, mos7840_port);
1112
1113         dbg("mos7840_open: bulkin endpoint is %d",
1114             port->bulk_in_endpointAddress);
1115         mos7840_port->read_urb_busy = true;
1116         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1117         if (response) {
1118                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1119                         __func__, response);
1120                 mos7840_port->read_urb_busy = false;
1121         }
1122
1123         /* initialize our wait queues */
1124         init_waitqueue_head(&mos7840_port->wait_chase);
1125         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1126
1127         /* initialize our icount structure */
1128         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1129
1130         /* initialize our port settings */
1131         /* Must set to enable ints! */
1132         mos7840_port->shadowMCR = MCR_MASTER_IE;
1133         /* send a open port command */
1134         mos7840_port->open = 1;
1135         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1136         mos7840_port->icount.tx = 0;
1137         mos7840_port->icount.rx = 0;
1138
1139         dbg("usb_serial serial:%p       mos7840_port:%p\n      usb_serial_port port:%p",
1140                                 serial, mos7840_port, port);
1141
1142         dbg ("%s leave", __func__);
1143
1144         return 0;
1145
1146 }
1147
1148 /*****************************************************************************
1149  * mos7840_chars_in_buffer
1150  *      this function is called by the tty driver when it wants to know how many
1151  *      bytes of data we currently have outstanding in the port (data that has
1152  *      been written, but hasn't made it out the port yet)
1153  *      If successful, we return the number of bytes left to be written in the
1154  *      system,
1155  *      Otherwise we return zero.
1156  *****************************************************************************/
1157
1158 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1159 {
1160         struct usb_serial_port *port = tty->driver_data;
1161         int i;
1162         int chars = 0;
1163         unsigned long flags;
1164         struct moschip_port *mos7840_port;
1165
1166         dbg("%s", " mos7840_chars_in_buffer:entering ...........");
1167
1168         if (mos7840_port_paranoia_check(port, __func__)) {
1169                 dbg("%s", "Invalid port");
1170                 return 0;
1171         }
1172
1173         mos7840_port = mos7840_get_port_private(port);
1174         if (mos7840_port == NULL) {
1175                 dbg("%s", "mos7840_break:leaving ...........");
1176                 return 0;
1177         }
1178
1179         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1180         for (i = 0; i < NUM_URBS; ++i)
1181                 if (mos7840_port->busy[i])
1182                         chars += URB_TRANSFER_BUFFER_SIZE;
1183         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1184         dbg("%s - returns %d", __func__, chars);
1185         return chars;
1186
1187 }
1188
1189 /*****************************************************************************
1190  * mos7840_close
1191  *      this function is called by the tty driver when a port is closed
1192  *****************************************************************************/
1193
1194 static void mos7840_close(struct usb_serial_port *port)
1195 {
1196         struct usb_serial *serial;
1197         struct moschip_port *mos7840_port;
1198         struct moschip_port *port0;
1199         int j;
1200         __u16 Data;
1201
1202         dbg("%s", "mos7840_close:entering...");
1203
1204         if (mos7840_port_paranoia_check(port, __func__)) {
1205                 dbg("%s", "Port Paranoia failed");
1206                 return;
1207         }
1208
1209         serial = mos7840_get_usb_serial(port, __func__);
1210         if (!serial) {
1211                 dbg("%s", "Serial Paranoia failed");
1212                 return;
1213         }
1214
1215         mos7840_port = mos7840_get_port_private(port);
1216         port0 = mos7840_get_port_private(serial->port[0]);
1217
1218         if (mos7840_port == NULL || port0 == NULL)
1219                 return;
1220
1221         for (j = 0; j < NUM_URBS; ++j)
1222                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1223
1224         /* Freeing Write URBs */
1225         for (j = 0; j < NUM_URBS; ++j) {
1226                 if (mos7840_port->write_urb_pool[j]) {
1227                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1228                                 kfree(mos7840_port->write_urb_pool[j]->
1229                                       transfer_buffer);
1230
1231                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1232                 }
1233         }
1234
1235         /* While closing port, shutdown all bulk read, write  *
1236          * and interrupt read if they exists                  */
1237         if (serial->dev) {
1238                 if (mos7840_port->write_urb) {
1239                         dbg("%s", "Shutdown bulk write");
1240                         usb_kill_urb(mos7840_port->write_urb);
1241                 }
1242                 if (mos7840_port->read_urb) {
1243                         dbg("%s", "Shutdown bulk read");
1244                         usb_kill_urb(mos7840_port->read_urb);
1245                         mos7840_port->read_urb_busy = false;
1246                 }
1247                 if ((&mos7840_port->control_urb)) {
1248                         dbg("%s", "Shutdown control read");
1249                         /*/      usb_kill_urb (mos7840_port->control_urb); */
1250                 }
1251         }
1252 /*      if(mos7840_port->ctrl_buf != NULL) */
1253 /*              kfree(mos7840_port->ctrl_buf); */
1254         port0->open_ports--;
1255         dbg("mos7840_num_open_ports in close%d:in port%d",
1256             port0->open_ports, port->number);
1257         if (port0->open_ports == 0) {
1258                 if (serial->port[0]->interrupt_in_urb) {
1259                         dbg("%s", "Shutdown interrupt_in_urb");
1260                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1261                 }
1262         }
1263
1264         if (mos7840_port->write_urb) {
1265                 /* if this urb had a transfer buffer already (old tx) free it */
1266                 if (mos7840_port->write_urb->transfer_buffer != NULL)
1267                         kfree(mos7840_port->write_urb->transfer_buffer);
1268                 usb_free_urb(mos7840_port->write_urb);
1269         }
1270
1271         Data = 0x0;
1272         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1273
1274         Data = 0x00;
1275         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1276
1277         mos7840_port->open = 0;
1278
1279         dbg("%s", "Leaving ............");
1280 }
1281
1282 /************************************************************************
1283  *
1284  * mos7840_block_until_chase_response
1285  *
1286  *      This function will block the close until one of the following:
1287  *              1. Response to our Chase comes from mos7840
1288  *              2. A timeout of 10 seconds without activity has expired
1289  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1290  *
1291  ************************************************************************/
1292
1293 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1294                                         struct moschip_port *mos7840_port)
1295 {
1296         int timeout = 1 * HZ;
1297         int wait = 10;
1298         int count;
1299
1300         while (1) {
1301                 count = mos7840_chars_in_buffer(tty);
1302
1303                 /* Check for Buffer status */
1304                 if (count <= 0)
1305                         return;
1306
1307                 /* Block the thread for a while */
1308                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1309                                                timeout);
1310                 /* No activity.. count down section */
1311                 wait--;
1312                 if (wait == 0) {
1313                         dbg("%s - TIMEOUT", __func__);
1314                         return;
1315                 } else {
1316                         /* Reset timeout value back to seconds */
1317                         wait = 10;
1318                 }
1319         }
1320
1321 }
1322
1323 /*****************************************************************************
1324  * mos7840_break
1325  *      this function sends a break to the port
1326  *****************************************************************************/
1327 static void mos7840_break(struct tty_struct *tty, int break_state)
1328 {
1329         struct usb_serial_port *port = tty->driver_data;
1330         unsigned char data;
1331         struct usb_serial *serial;
1332         struct moschip_port *mos7840_port;
1333
1334         dbg("%s", "Entering ...........");
1335         dbg("mos7840_break: Start");
1336
1337         if (mos7840_port_paranoia_check(port, __func__)) {
1338                 dbg("%s", "Port Paranoia failed");
1339                 return;
1340         }
1341
1342         serial = mos7840_get_usb_serial(port, __func__);
1343         if (!serial) {
1344                 dbg("%s", "Serial Paranoia failed");
1345                 return;
1346         }
1347
1348         mos7840_port = mos7840_get_port_private(port);
1349
1350         if (mos7840_port == NULL)
1351                 return;
1352
1353         if (serial->dev)
1354                 /* flush and block until tx is empty */
1355                 mos7840_block_until_chase_response(tty, mos7840_port);
1356
1357         if (break_state == -1)
1358                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1359         else
1360                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1361
1362         /* FIXME: no locking on shadowLCR anywhere in driver */
1363         mos7840_port->shadowLCR = data;
1364         dbg("mcs7840_break mos7840_port->shadowLCR is %x",
1365             mos7840_port->shadowLCR);
1366         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1367                              mos7840_port->shadowLCR);
1368 }
1369
1370 /*****************************************************************************
1371  * mos7840_write_room
1372  *      this function is called by the tty driver when it wants to know how many
1373  *      bytes of data we can accept for a specific port.
1374  *      If successful, we return the amount of room that we have for this port
1375  *      Otherwise we return a negative error number.
1376  *****************************************************************************/
1377
1378 static int mos7840_write_room(struct tty_struct *tty)
1379 {
1380         struct usb_serial_port *port = tty->driver_data;
1381         int i;
1382         int room = 0;
1383         unsigned long flags;
1384         struct moschip_port *mos7840_port;
1385
1386         dbg("%s", " mos7840_write_room:entering ...........");
1387
1388         if (mos7840_port_paranoia_check(port, __func__)) {
1389                 dbg("%s", "Invalid port");
1390                 dbg("%s", " mos7840_write_room:leaving ...........");
1391                 return -1;
1392         }
1393
1394         mos7840_port = mos7840_get_port_private(port);
1395         if (mos7840_port == NULL) {
1396                 dbg("%s", "mos7840_break:leaving ...........");
1397                 return -1;
1398         }
1399
1400         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1401         for (i = 0; i < NUM_URBS; ++i) {
1402                 if (!mos7840_port->busy[i])
1403                         room += URB_TRANSFER_BUFFER_SIZE;
1404         }
1405         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1406
1407         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1408         dbg("%s - returns %d", __func__, room);
1409         return room;
1410
1411 }
1412
1413 /*****************************************************************************
1414  * mos7840_write
1415  *      this function is called by the tty driver when data should be written to
1416  *      the port.
1417  *      If successful, we return the number of bytes written, otherwise we
1418  *      return a negative error number.
1419  *****************************************************************************/
1420
1421 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1422                          const unsigned char *data, int count)
1423 {
1424         int status;
1425         int i;
1426         int bytes_sent = 0;
1427         int transfer_size;
1428         unsigned long flags;
1429
1430         struct moschip_port *mos7840_port;
1431         struct usb_serial *serial;
1432         struct urb *urb;
1433         /* __u16 Data; */
1434         const unsigned char *current_position = data;
1435         unsigned char *data1;
1436         dbg("%s", "entering ...........");
1437         /* dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1438                                         mos7840_port->shadowLCR); */
1439
1440 #ifdef NOTMOS7840
1441         Data = 0x00;
1442         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1443         mos7840_port->shadowLCR = Data;
1444         dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
1445         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1446             mos7840_port->shadowLCR);
1447
1448         /* Data = 0x03; */
1449         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1450         /* mos7840_port->shadowLCR=Data;//Need to add later */
1451
1452         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1453         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1454
1455         /* Data = 0x0c; */
1456         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1457         Data = 0x00;
1458         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1459         dbg("mos7840_write:DLL value is %x", Data);
1460
1461         Data = 0x0;
1462         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1463         dbg("mos7840_write:DLM value is %x", Data);
1464
1465         Data = Data & ~SERIAL_LCR_DLAB;
1466         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1467             mos7840_port->shadowLCR);
1468         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1469 #endif
1470
1471         if (mos7840_port_paranoia_check(port, __func__)) {
1472                 dbg("%s", "Port Paranoia failed");
1473                 return -1;
1474         }
1475
1476         serial = port->serial;
1477         if (mos7840_serial_paranoia_check(serial, __func__)) {
1478                 dbg("%s", "Serial Paranoia failed");
1479                 return -1;
1480         }
1481
1482         mos7840_port = mos7840_get_port_private(port);
1483         if (mos7840_port == NULL) {
1484                 dbg("%s", "mos7840_port is NULL");
1485                 return -1;
1486         }
1487
1488         /* try to find a free urb in the list */
1489         urb = NULL;
1490
1491         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1492         for (i = 0; i < NUM_URBS; ++i) {
1493                 if (!mos7840_port->busy[i]) {
1494                         mos7840_port->busy[i] = 1;
1495                         urb = mos7840_port->write_urb_pool[i];
1496                         dbg("URB:%d", i);
1497                         break;
1498                 }
1499         }
1500         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1501
1502         if (urb == NULL) {
1503                 dbg("%s - no more free urbs", __func__);
1504                 goto exit;
1505         }
1506
1507         if (urb->transfer_buffer == NULL) {
1508                 urb->transfer_buffer =
1509                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1510
1511                 if (urb->transfer_buffer == NULL) {
1512                         dev_err(&port->dev, "%s no more kernel memory...\n",
1513                                 __func__);
1514                         goto exit;
1515                 }
1516         }
1517         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1518
1519         memcpy(urb->transfer_buffer, current_position, transfer_size);
1520
1521         /* fill urb with data and submit  */
1522         usb_fill_bulk_urb(urb,
1523                           serial->dev,
1524                           usb_sndbulkpipe(serial->dev,
1525                                           port->bulk_out_endpointAddress),
1526                           urb->transfer_buffer,
1527                           transfer_size,
1528                           mos7840_bulk_out_data_callback, mos7840_port);
1529
1530         data1 = urb->transfer_buffer;
1531         dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
1532
1533         /* send it down the pipe */
1534         status = usb_submit_urb(urb, GFP_ATOMIC);
1535
1536         if (status) {
1537                 mos7840_port->busy[i] = 0;
1538                 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1539                         "with status = %d\n", __func__, status);
1540                 bytes_sent = status;
1541                 goto exit;
1542         }
1543         bytes_sent = transfer_size;
1544         mos7840_port->icount.tx += transfer_size;
1545         smp_wmb();
1546         dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
1547 exit:
1548         return bytes_sent;
1549
1550 }
1551
1552 /*****************************************************************************
1553  * mos7840_throttle
1554  *      this function is called by the tty driver when it wants to stop the data
1555  *      being read from the port.
1556  *****************************************************************************/
1557
1558 static void mos7840_throttle(struct tty_struct *tty)
1559 {
1560         struct usb_serial_port *port = tty->driver_data;
1561         struct moschip_port *mos7840_port;
1562         int status;
1563
1564         if (mos7840_port_paranoia_check(port, __func__)) {
1565                 dbg("%s", "Invalid port");
1566                 return;
1567         }
1568
1569         dbg("- port %d", port->number);
1570
1571         mos7840_port = mos7840_get_port_private(port);
1572
1573         if (mos7840_port == NULL)
1574                 return;
1575
1576         if (!mos7840_port->open) {
1577                 dbg("%s", "port not opened");
1578                 return;
1579         }
1580
1581         dbg("%s", "Entering ..........");
1582
1583         /* if we are implementing XON/XOFF, send the stop character */
1584         if (I_IXOFF(tty)) {
1585                 unsigned char stop_char = STOP_CHAR(tty);
1586                 status = mos7840_write(tty, port, &stop_char, 1);
1587                 if (status <= 0)
1588                         return;
1589         }
1590         /* if we are implementing RTS/CTS, toggle that line */
1591         if (tty->termios->c_cflag & CRTSCTS) {
1592                 mos7840_port->shadowMCR &= ~MCR_RTS;
1593                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1594                                          mos7840_port->shadowMCR);
1595                 if (status < 0)
1596                         return;
1597         }
1598 }
1599
1600 /*****************************************************************************
1601  * mos7840_unthrottle
1602  *      this function is called by the tty driver when it wants to resume
1603  *      the data being read from the port (called after mos7840_throttle is
1604  *      called)
1605  *****************************************************************************/
1606 static void mos7840_unthrottle(struct tty_struct *tty)
1607 {
1608         struct usb_serial_port *port = tty->driver_data;
1609         int status;
1610         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1611
1612         if (mos7840_port_paranoia_check(port, __func__)) {
1613                 dbg("%s", "Invalid port");
1614                 return;
1615         }
1616
1617         if (mos7840_port == NULL)
1618                 return;
1619
1620         if (!mos7840_port->open) {
1621                 dbg("%s - port not opened", __func__);
1622                 return;
1623         }
1624
1625         dbg("%s", "Entering ..........");
1626
1627         /* if we are implementing XON/XOFF, send the start character */
1628         if (I_IXOFF(tty)) {
1629                 unsigned char start_char = START_CHAR(tty);
1630                 status = mos7840_write(tty, port, &start_char, 1);
1631                 if (status <= 0)
1632                         return;
1633         }
1634
1635         /* if we are implementing RTS/CTS, toggle that line */
1636         if (tty->termios->c_cflag & CRTSCTS) {
1637                 mos7840_port->shadowMCR |= MCR_RTS;
1638                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1639                                          mos7840_port->shadowMCR);
1640                 if (status < 0)
1641                         return;
1642         }
1643 }
1644
1645 static int mos7840_tiocmget(struct tty_struct *tty)
1646 {
1647         struct usb_serial_port *port = tty->driver_data;
1648         struct moschip_port *mos7840_port;
1649         unsigned int result;
1650         __u16 msr;
1651         __u16 mcr;
1652         int status;
1653         mos7840_port = mos7840_get_port_private(port);
1654
1655         dbg("%s - port %d", __func__, port->number);
1656
1657         if (mos7840_port == NULL)
1658                 return -ENODEV;
1659
1660         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1661         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1662         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1663             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1664             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1665             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1666             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1667             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1668             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1669
1670         dbg("%s - 0x%04X", __func__, result);
1671
1672         return result;
1673 }
1674
1675 static int mos7840_tiocmset(struct tty_struct *tty,
1676                             unsigned int set, unsigned int clear)
1677 {
1678         struct usb_serial_port *port = tty->driver_data;
1679         struct moschip_port *mos7840_port;
1680         unsigned int mcr;
1681         int status;
1682
1683         dbg("%s - port %d", __func__, port->number);
1684
1685         mos7840_port = mos7840_get_port_private(port);
1686
1687         if (mos7840_port == NULL)
1688                 return -ENODEV;
1689
1690         /* FIXME: What locks the port registers ? */
1691         mcr = mos7840_port->shadowMCR;
1692         if (clear & TIOCM_RTS)
1693                 mcr &= ~MCR_RTS;
1694         if (clear & TIOCM_DTR)
1695                 mcr &= ~MCR_DTR;
1696         if (clear & TIOCM_LOOP)
1697                 mcr &= ~MCR_LOOPBACK;
1698
1699         if (set & TIOCM_RTS)
1700                 mcr |= MCR_RTS;
1701         if (set & TIOCM_DTR)
1702                 mcr |= MCR_DTR;
1703         if (set & TIOCM_LOOP)
1704                 mcr |= MCR_LOOPBACK;
1705
1706         mos7840_port->shadowMCR = mcr;
1707
1708         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1709         if (status < 0) {
1710                 dbg("setting MODEM_CONTROL_REGISTER Failed");
1711                 return status;
1712         }
1713
1714         return 0;
1715 }
1716
1717 /*****************************************************************************
1718  * mos7840_calc_baud_rate_divisor
1719  *      this function calculates the proper baud rate divisor for the specified
1720  *      baud rate.
1721  *****************************************************************************/
1722 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1723                                           __u16 *clk_sel_val)
1724 {
1725
1726         dbg("%s - %d", __func__, baudRate);
1727
1728         if (baudRate <= 115200) {
1729                 *divisor = 115200 / baudRate;
1730                 *clk_sel_val = 0x0;
1731         }
1732         if ((baudRate > 115200) && (baudRate <= 230400)) {
1733                 *divisor = 230400 / baudRate;
1734                 *clk_sel_val = 0x10;
1735         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1736                 *divisor = 403200 / baudRate;
1737                 *clk_sel_val = 0x20;
1738         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1739                 *divisor = 460800 / baudRate;
1740                 *clk_sel_val = 0x30;
1741         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1742                 *divisor = 806400 / baudRate;
1743                 *clk_sel_val = 0x40;
1744         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1745                 *divisor = 921600 / baudRate;
1746                 *clk_sel_val = 0x50;
1747         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1748                 *divisor = 1572864 / baudRate;
1749                 *clk_sel_val = 0x60;
1750         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1751                 *divisor = 3145728 / baudRate;
1752                 *clk_sel_val = 0x70;
1753         }
1754         return 0;
1755
1756 #ifdef NOTMCS7840
1757
1758         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1759                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1760                         *divisor = mos7840_divisor_table[i].Divisor;
1761                         return 0;
1762                 }
1763         }
1764
1765         /* After trying for all the standard baud rates    *
1766          * Try calculating the divisor for this baud rate  */
1767
1768         if (baudrate > 75 && baudrate < 230400) {
1769                 /* get the divisor */
1770                 custom = (__u16) (230400L / baudrate);
1771
1772                 /* Check for round off */
1773                 round1 = (__u16) (2304000L / baudrate);
1774                 round = (__u16) (round1 - (custom * 10));
1775                 if (round > 4)
1776                         custom++;
1777                 *divisor = custom;
1778
1779                 dbg(" Baud %d = %d", baudrate, custom);
1780                 return 0;
1781         }
1782
1783         dbg("%s", " Baud calculation Failed...");
1784         return -1;
1785 #endif
1786 }
1787
1788 /*****************************************************************************
1789  * mos7840_send_cmd_write_baud_rate
1790  *      this function sends the proper command to change the baud rate of the
1791  *      specified port.
1792  *****************************************************************************/
1793
1794 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1795                                             int baudRate)
1796 {
1797         int divisor = 0;
1798         int status;
1799         __u16 Data;
1800         unsigned char number;
1801         __u16 clk_sel_val;
1802         struct usb_serial_port *port;
1803
1804         if (mos7840_port == NULL)
1805                 return -1;
1806
1807         port = (struct usb_serial_port *)mos7840_port->port;
1808         if (mos7840_port_paranoia_check(port, __func__)) {
1809                 dbg("%s", "Invalid port");
1810                 return -1;
1811         }
1812
1813         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1814                 dbg("%s", "Invalid Serial");
1815                 return -1;
1816         }
1817
1818         dbg("%s", "Entering ..........");
1819
1820         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1821
1822         dbg("%s - port = %d, baud = %d", __func__,
1823             mos7840_port->port->number, baudRate);
1824         /* reset clk_uart_sel in spregOffset */
1825         if (baudRate > 115200) {
1826 #ifdef HW_flow_control
1827                 /* NOTE: need to see the pther register to modify */
1828                 /* setting h/w flow control bit to 1 */
1829                 Data = 0x2b;
1830                 mos7840_port->shadowMCR = Data;
1831                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1832                                                                         Data);
1833                 if (status < 0) {
1834                         dbg("Writing spreg failed in set_serial_baud");
1835                         return -1;
1836                 }
1837 #endif
1838
1839         } else {
1840 #ifdef HW_flow_control
1841                 / *setting h/w flow control bit to 0 */
1842                 Data = 0xb;
1843                 mos7840_port->shadowMCR = Data;
1844                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1845                                                                         Data);
1846                 if (status < 0) {
1847                         dbg("Writing spreg failed in set_serial_baud");
1848                         return -1;
1849                 }
1850 #endif
1851
1852         }
1853
1854         if (1) {                /* baudRate <= 115200) */
1855                 clk_sel_val = 0x0;
1856                 Data = 0x0;
1857                 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1858                                                    &clk_sel_val);
1859                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1860                                                                  &Data);
1861                 if (status < 0) {
1862                         dbg("reading spreg failed in set_serial_baud");
1863                         return -1;
1864                 }
1865                 Data = (Data & 0x8f) | clk_sel_val;
1866                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1867                                                                 Data);
1868                 if (status < 0) {
1869                         dbg("Writing spreg failed in set_serial_baud");
1870                         return -1;
1871                 }
1872                 /* Calculate the Divisor */
1873
1874                 if (status) {
1875                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1876                         return status;
1877                 }
1878                 /* Enable access to divisor latch */
1879                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1880                 mos7840_port->shadowLCR = Data;
1881                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1882
1883                 /* Write the divisor */
1884                 Data = (unsigned char)(divisor & 0xff);
1885                 dbg("set_serial_baud Value to write DLL is %x", Data);
1886                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1887
1888                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1889                 dbg("set_serial_baud Value to write DLM is %x", Data);
1890                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1891
1892                 /* Disable access to divisor latch */
1893                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1894                 mos7840_port->shadowLCR = Data;
1895                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1896
1897         }
1898         return status;
1899 }
1900
1901 /*****************************************************************************
1902  * mos7840_change_port_settings
1903  *      This routine is called to set the UART on the device to match
1904  *      the specified new settings.
1905  *****************************************************************************/
1906
1907 static void mos7840_change_port_settings(struct tty_struct *tty,
1908         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1909 {
1910         int baud;
1911         unsigned cflag;
1912         unsigned iflag;
1913         __u8 lData;
1914         __u8 lParity;
1915         __u8 lStop;
1916         int status;
1917         __u16 Data;
1918         struct usb_serial_port *port;
1919         struct usb_serial *serial;
1920
1921         if (mos7840_port == NULL)
1922                 return;
1923
1924         port = (struct usb_serial_port *)mos7840_port->port;
1925
1926         if (mos7840_port_paranoia_check(port, __func__)) {
1927                 dbg("%s", "Invalid port");
1928                 return;
1929         }
1930
1931         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1932                 dbg("%s", "Invalid Serial");
1933                 return;
1934         }
1935
1936         serial = port->serial;
1937
1938         dbg("%s - port %d", __func__, mos7840_port->port->number);
1939
1940         if (!mos7840_port->open) {
1941                 dbg("%s - port not opened", __func__);
1942                 return;
1943         }
1944
1945         dbg("%s", "Entering ..........");
1946
1947         lData = LCR_BITS_8;
1948         lStop = LCR_STOP_1;
1949         lParity = LCR_PAR_NONE;
1950
1951         cflag = tty->termios->c_cflag;
1952         iflag = tty->termios->c_iflag;
1953
1954         /* Change the number of bits */
1955         if (cflag & CSIZE) {
1956                 switch (cflag & CSIZE) {
1957                 case CS5:
1958                         lData = LCR_BITS_5;
1959                         break;
1960
1961                 case CS6:
1962                         lData = LCR_BITS_6;
1963                         break;
1964
1965                 case CS7:
1966                         lData = LCR_BITS_7;
1967                         break;
1968                 default:
1969                 case CS8:
1970                         lData = LCR_BITS_8;
1971                         break;
1972                 }
1973         }
1974         /* Change the Parity bit */
1975         if (cflag & PARENB) {
1976                 if (cflag & PARODD) {
1977                         lParity = LCR_PAR_ODD;
1978                         dbg("%s - parity = odd", __func__);
1979                 } else {
1980                         lParity = LCR_PAR_EVEN;
1981                         dbg("%s - parity = even", __func__);
1982                 }
1983
1984         } else {
1985                 dbg("%s - parity = none", __func__);
1986         }
1987
1988         if (cflag & CMSPAR)
1989                 lParity = lParity | 0x20;
1990
1991         /* Change the Stop bit */
1992         if (cflag & CSTOPB) {
1993                 lStop = LCR_STOP_2;
1994                 dbg("%s - stop bits = 2", __func__);
1995         } else {
1996                 lStop = LCR_STOP_1;
1997                 dbg("%s - stop bits = 1", __func__);
1998         }
1999
2000         /* Update the LCR with the correct value */
2001         mos7840_port->shadowLCR &=
2002             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
2003         mos7840_port->shadowLCR |= (lData | lParity | lStop);
2004
2005         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
2006             mos7840_port->shadowLCR);
2007         /* Disable Interrupts */
2008         Data = 0x00;
2009         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2010
2011         Data = 0x00;
2012         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2013
2014         Data = 0xcf;
2015         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2016
2017         /* Send the updated LCR value to the mos7840 */
2018         Data = mos7840_port->shadowLCR;
2019
2020         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2021
2022         Data = 0x00b;
2023         mos7840_port->shadowMCR = Data;
2024         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2025         Data = 0x00b;
2026         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2027
2028         /* set up the MCR register and send it to the mos7840 */
2029
2030         mos7840_port->shadowMCR = MCR_MASTER_IE;
2031         if (cflag & CBAUD)
2032                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2033
2034         if (cflag & CRTSCTS)
2035                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2036         else
2037                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2038
2039         Data = mos7840_port->shadowMCR;
2040         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2041
2042         /* Determine divisor based on baud rate */
2043         baud = tty_get_baud_rate(tty);
2044
2045         if (!baud) {
2046                 /* pick a default, any default... */
2047                 dbg("%s", "Picked default baud...");
2048                 baud = 9600;
2049         }
2050
2051         dbg("%s - baud rate = %d", __func__, baud);
2052         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2053
2054         /* Enable Interrupts */
2055         Data = 0x0c;
2056         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2057
2058         if (mos7840_port->read_urb_busy == false) {
2059                 mos7840_port->read_urb_busy = true;
2060                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2061                 if (status) {
2062                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2063                             status);
2064                         mos7840_port->read_urb_busy = false;
2065                 }
2066         }
2067         wake_up(&mos7840_port->delta_msr_wait);
2068         mos7840_port->delta_msr_cond = 1;
2069         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
2070             mos7840_port->shadowLCR);
2071 }
2072
2073 /*****************************************************************************
2074  * mos7840_set_termios
2075  *      this function is called by the tty driver when it wants to change
2076  *      the termios structure
2077  *****************************************************************************/
2078
2079 static void mos7840_set_termios(struct tty_struct *tty,
2080                                 struct usb_serial_port *port,
2081                                 struct ktermios *old_termios)
2082 {
2083         int status;
2084         unsigned int cflag;
2085         struct usb_serial *serial;
2086         struct moschip_port *mos7840_port;
2087         dbg("mos7840_set_termios: START");
2088         if (mos7840_port_paranoia_check(port, __func__)) {
2089                 dbg("%s", "Invalid port");
2090                 return;
2091         }
2092
2093         serial = port->serial;
2094
2095         if (mos7840_serial_paranoia_check(serial, __func__)) {
2096                 dbg("%s", "Invalid Serial");
2097                 return;
2098         }
2099
2100         mos7840_port = mos7840_get_port_private(port);
2101
2102         if (mos7840_port == NULL)
2103                 return;
2104
2105         if (!mos7840_port->open) {
2106                 dbg("%s - port not opened", __func__);
2107                 return;
2108         }
2109
2110         dbg("%s", "setting termios - ");
2111
2112         cflag = tty->termios->c_cflag;
2113
2114         dbg("%s - clfag %08x iflag %08x", __func__,
2115             tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2116         dbg("%s - old clfag %08x old iflag %08x", __func__,
2117             old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2118         dbg("%s - port %d", __func__, port->number);
2119
2120         /* change the port settings to the new ones specified */
2121
2122         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2123
2124         if (!mos7840_port->read_urb) {
2125                 dbg("%s", "URB KILLED !!!!!");
2126                 return;
2127         }
2128
2129         if (mos7840_port->read_urb_busy == false) {
2130                 mos7840_port->read_urb_busy = true;
2131                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2132                 if (status) {
2133                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2134                             status);
2135                         mos7840_port->read_urb_busy = false;
2136                 }
2137         }
2138 }
2139
2140 /*****************************************************************************
2141  * mos7840_get_lsr_info - get line status register info
2142  *
2143  * Purpose: Let user call ioctl() to get info when the UART physically
2144  *          is emptied.  On bus types like RS485, the transmitter must
2145  *          release the bus after transmitting. This must be done when
2146  *          the transmit shift register is empty, not be done when the
2147  *          transmit holding register is empty.  This functionality
2148  *          allows an RS485 driver to be written in user space.
2149  *****************************************************************************/
2150
2151 static int mos7840_get_lsr_info(struct tty_struct *tty,
2152                                 unsigned int __user *value)
2153 {
2154         int count;
2155         unsigned int result = 0;
2156
2157         count = mos7840_chars_in_buffer(tty);
2158         if (count == 0) {
2159                 dbg("%s -- Empty", __func__);
2160                 result = TIOCSER_TEMT;
2161         }
2162
2163         if (copy_to_user(value, &result, sizeof(int)))
2164                 return -EFAULT;
2165         return 0;
2166 }
2167
2168 /*****************************************************************************
2169  * mos7840_get_serial_info
2170  *      function to get information about serial port
2171  *****************************************************************************/
2172
2173 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2174                                    struct serial_struct __user *retinfo)
2175 {
2176         struct serial_struct tmp;
2177
2178         if (mos7840_port == NULL)
2179                 return -1;
2180
2181         if (!retinfo)
2182                 return -EFAULT;
2183
2184         memset(&tmp, 0, sizeof(tmp));
2185
2186         tmp.type = PORT_16550A;
2187         tmp.line = mos7840_port->port->serial->minor;
2188         tmp.port = mos7840_port->port->number;
2189         tmp.irq = 0;
2190         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2191         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2192         tmp.baud_base = 9600;
2193         tmp.close_delay = 5 * HZ;
2194         tmp.closing_wait = 30 * HZ;
2195
2196         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2197                 return -EFAULT;
2198         return 0;
2199 }
2200
2201 static int mos7840_get_icount(struct tty_struct *tty,
2202                         struct serial_icounter_struct *icount)
2203 {
2204         struct usb_serial_port *port = tty->driver_data;
2205         struct moschip_port *mos7840_port;
2206         struct async_icount cnow;
2207
2208         mos7840_port = mos7840_get_port_private(port);
2209         cnow = mos7840_port->icount;
2210
2211         smp_rmb();
2212         icount->cts = cnow.cts;
2213         icount->dsr = cnow.dsr;
2214         icount->rng = cnow.rng;
2215         icount->dcd = cnow.dcd;
2216         icount->rx = cnow.rx;
2217         icount->tx = cnow.tx;
2218         icount->frame = cnow.frame;
2219         icount->overrun = cnow.overrun;
2220         icount->parity = cnow.parity;
2221         icount->brk = cnow.brk;
2222         icount->buf_overrun = cnow.buf_overrun;
2223
2224         dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2225                 port->number, icount->rx, icount->tx);
2226         return 0;
2227 }
2228
2229 /*****************************************************************************
2230  * SerialIoctl
2231  *      this function handles any ioctl calls to the driver
2232  *****************************************************************************/
2233
2234 static int mos7840_ioctl(struct tty_struct *tty,
2235                          unsigned int cmd, unsigned long arg)
2236 {
2237         struct usb_serial_port *port = tty->driver_data;
2238         void __user *argp = (void __user *)arg;
2239         struct moschip_port *mos7840_port;
2240
2241         struct async_icount cnow;
2242         struct async_icount cprev;
2243
2244         if (mos7840_port_paranoia_check(port, __func__)) {
2245                 dbg("%s", "Invalid port");
2246                 return -1;
2247         }
2248
2249         mos7840_port = mos7840_get_port_private(port);
2250
2251         if (mos7840_port == NULL)
2252                 return -1;
2253
2254         dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2255
2256         switch (cmd) {
2257                 /* return number of bytes available */
2258
2259         case TIOCSERGETLSR:
2260                 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2261                 return mos7840_get_lsr_info(tty, argp);
2262
2263         case TIOCGSERIAL:
2264                 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2265                 return mos7840_get_serial_info(mos7840_port, argp);
2266
2267         case TIOCSSERIAL:
2268                 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2269                 break;
2270
2271         case TIOCMIWAIT:
2272                 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2273                 cprev = mos7840_port->icount;
2274                 while (1) {
2275                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2276                         mos7840_port->delta_msr_cond = 0;
2277                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2278                                                  (mos7840_port->
2279                                                   delta_msr_cond == 1));
2280
2281                         /* see if a signal did it */
2282                         if (signal_pending(current))
2283                                 return -ERESTARTSYS;
2284                         cnow = mos7840_port->icount;
2285                         smp_rmb();
2286                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2287                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2288                                 return -EIO;    /* no change => error */
2289                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2290                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2291                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2292                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2293                                 return 0;
2294                         }
2295                         cprev = cnow;
2296                 }
2297                 /* NOTREACHED */
2298                 break;
2299
2300         default:
2301                 break;
2302         }
2303         return -ENOIOCTLCMD;
2304 }
2305
2306 static int mos7840_calc_num_ports(struct usb_serial *serial)
2307 {
2308         int mos7840_num_ports = 0;
2309
2310         dbg("numberofendpoints: cur %d, alt %d",
2311             (int)serial->interface->cur_altsetting->desc.bNumEndpoints,
2312             (int)serial->interface->altsetting->desc.bNumEndpoints);
2313         if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2314                 mos7840_num_ports = serial->num_ports = 2;
2315         } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2316                 serial->num_bulk_in = 4;
2317                 serial->num_bulk_out = 4;
2318                 mos7840_num_ports = serial->num_ports = 4;
2319         }
2320         dbg ("mos7840_num_ports = %d", mos7840_num_ports);
2321         return mos7840_num_ports;
2322 }
2323
2324 /****************************************************************************
2325  * mos7840_startup
2326  ****************************************************************************/
2327
2328 static int mos7840_startup(struct usb_serial *serial)
2329 {
2330         struct moschip_port *mos7840_port;
2331         struct usb_device *dev;
2332         int i, status;
2333
2334         __u16 Data;
2335         dbg("%s", "mos7840_startup :Entering..........");
2336
2337         if (!serial) {
2338                 dbg("%s", "Invalid Handler");
2339                 return -1;
2340         }
2341
2342         dev = serial->dev;
2343
2344         dbg("%s", "Entering...");
2345         dbg ("mos7840_startup: serial = %p", serial);
2346
2347         /* we set up the pointers to the endpoints in the mos7840_open *
2348          * function, as the structures aren't created yet.             */
2349
2350         /* set up port private structures */
2351         for (i = 0; i < serial->num_ports; ++i) {
2352                 dbg ("mos7840_startup: configuring port %d............", i);
2353                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2354                 if (mos7840_port == NULL) {
2355                         dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2356                         status = -ENOMEM;
2357                         i--; /* don't follow NULL pointer cleaning up */
2358                         goto error;
2359                 }
2360
2361                 /* Initialize all port interrupt end point to port 0 int
2362                  * endpoint. Our device has only one interrupt end point
2363                  * common to all port */
2364
2365                 mos7840_port->port = serial->port[i];
2366                 mos7840_set_port_private(serial->port[i], mos7840_port);
2367                 spin_lock_init(&mos7840_port->pool_lock);
2368
2369                 /* minor is not initialised until later by
2370                  * usb-serial.c:get_free_serial() and cannot therefore be used
2371                  * to index device instances */
2372                 mos7840_port->port_num = i + 1;
2373                 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2374                 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2375                 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2376                 dbg ("serial->minor = %d", serial->minor);
2377
2378                 if (mos7840_port->port_num == 1) {
2379                         mos7840_port->SpRegOffset = 0x0;
2380                         mos7840_port->ControlRegOffset = 0x1;
2381                         mos7840_port->DcrRegOffset = 0x4;
2382                 } else if ((mos7840_port->port_num == 2)
2383                            && (serial->num_ports == 4)) {
2384                         mos7840_port->SpRegOffset = 0x8;
2385                         mos7840_port->ControlRegOffset = 0x9;
2386                         mos7840_port->DcrRegOffset = 0x16;
2387                 } else if ((mos7840_port->port_num == 2)
2388                            && (serial->num_ports == 2)) {
2389                         mos7840_port->SpRegOffset = 0xa;
2390                         mos7840_port->ControlRegOffset = 0xb;
2391                         mos7840_port->DcrRegOffset = 0x19;
2392                 } else if ((mos7840_port->port_num == 3)
2393                            && (serial->num_ports == 4)) {
2394                         mos7840_port->SpRegOffset = 0xa;
2395                         mos7840_port->ControlRegOffset = 0xb;
2396                         mos7840_port->DcrRegOffset = 0x19;
2397                 } else if ((mos7840_port->port_num == 4)
2398                            && (serial->num_ports == 4)) {
2399                         mos7840_port->SpRegOffset = 0xc;
2400                         mos7840_port->ControlRegOffset = 0xd;
2401                         mos7840_port->DcrRegOffset = 0x1c;
2402                 }
2403                 mos7840_dump_serial_port(mos7840_port);
2404                 mos7840_set_port_private(serial->port[i], mos7840_port);
2405
2406                 /* enable rx_disable bit in control register */
2407                 status = mos7840_get_reg_sync(serial->port[i],
2408                                  mos7840_port->ControlRegOffset, &Data);
2409                 if (status < 0) {
2410                         dbg("Reading ControlReg failed status-0x%x", status);
2411                         break;
2412                 } else
2413                         dbg("ControlReg Reading success val is %x, status%d",
2414                             Data, status);
2415                 Data |= 0x08;   /* setting driver done bit */
2416                 Data |= 0x04;   /* sp1_bit to have cts change reflect in
2417                                    modem status reg */
2418
2419                 /* Data |= 0x20; //rx_disable bit */
2420                 status = mos7840_set_reg_sync(serial->port[i],
2421                                          mos7840_port->ControlRegOffset, Data);
2422                 if (status < 0) {
2423                         dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
2424                         break;
2425                 } else
2426                         dbg("ControlReg Writing success(rx_disable) status%d",
2427                             status);
2428
2429                 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2430                    and 0x24 in DCR3 */
2431                 Data = 0x01;
2432                 status = mos7840_set_reg_sync(serial->port[i],
2433                          (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2434                 if (status < 0) {
2435                         dbg("Writing DCR0 failed status-0x%x", status);
2436                         break;
2437                 } else
2438                         dbg("DCR0 Writing success status%d", status);
2439
2440                 Data = 0x05;
2441                 status = mos7840_set_reg_sync(serial->port[i],
2442                          (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2443                 if (status < 0) {
2444                         dbg("Writing DCR1 failed status-0x%x", status);
2445                         break;
2446                 } else
2447                         dbg("DCR1 Writing success status%d", status);
2448
2449                 Data = 0x24;
2450                 status = mos7840_set_reg_sync(serial->port[i],
2451                          (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2452                 if (status < 0) {
2453                         dbg("Writing DCR2 failed status-0x%x", status);
2454                         break;
2455                 } else
2456                         dbg("DCR2 Writing success status%d", status);
2457
2458                 /* write values in clkstart0x0 and clkmulti 0x20 */
2459                 Data = 0x0;
2460                 status = mos7840_set_reg_sync(serial->port[i],
2461                                          CLK_START_VALUE_REGISTER, Data);
2462                 if (status < 0) {
2463                         dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
2464                         break;
2465                 } else
2466                         dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
2467
2468                 Data = 0x20;
2469                 status = mos7840_set_reg_sync(serial->port[i],
2470                                         CLK_MULTI_REGISTER, Data);
2471                 if (status < 0) {
2472                         dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
2473                             status);
2474                         goto error;
2475                 } else
2476                         dbg("CLK_MULTI_REGISTER Writing success status%d",
2477                             status);
2478
2479                 /* write value 0x0 to scratchpad register */
2480                 Data = 0x00;
2481                 status = mos7840_set_uart_reg(serial->port[i],
2482                                                 SCRATCH_PAD_REGISTER, Data);
2483                 if (status < 0) {
2484                         dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
2485                             status);
2486                         break;
2487                 } else
2488                         dbg("SCRATCH_PAD_REGISTER Writing success status%d",
2489                             status);
2490
2491                 /* Zero Length flag register */
2492                 if ((mos7840_port->port_num != 1)
2493                     && (serial->num_ports == 2)) {
2494
2495                         Data = 0xff;
2496                         status = mos7840_set_reg_sync(serial->port[i],
2497                                       (__u16) (ZLP_REG1 +
2498                                       ((__u16)mos7840_port->port_num)), Data);
2499                         dbg("ZLIP offset %x",
2500                             (__u16) (ZLP_REG1 +
2501                                         ((__u16) mos7840_port->port_num)));
2502                         if (status < 0) {
2503                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2504                                     i + 2, status);
2505                                 break;
2506                         } else
2507                                 dbg("ZLP_REG%d Writing success status%d",
2508                                     i + 2, status);
2509                 } else {
2510                         Data = 0xff;
2511                         status = mos7840_set_reg_sync(serial->port[i],
2512                               (__u16) (ZLP_REG1 +
2513                               ((__u16)mos7840_port->port_num) - 0x1), Data);
2514                         dbg("ZLIP offset %x",
2515                             (__u16) (ZLP_REG1 +
2516                                      ((__u16) mos7840_port->port_num) - 0x1));
2517                         if (status < 0) {
2518                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2519                                     i + 1, status);
2520                                 break;
2521                         } else
2522                                 dbg("ZLP_REG%d Writing success status%d",
2523                                     i + 1, status);
2524
2525                 }
2526                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2527                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2528                 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2529                                                                 GFP_KERNEL);
2530                 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2531                                                         !mos7840_port->dr) {
2532                         status = -ENOMEM;
2533                         goto error;
2534                 }
2535         }
2536         dbg ("mos7840_startup: all ports configured...........");
2537
2538         /* Zero Length flag enable */
2539         Data = 0x0f;
2540         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2541         if (status < 0) {
2542                 dbg("Writing ZLP_REG5 failed status-0x%x", status);
2543                 goto error;
2544         } else
2545                 dbg("ZLP_REG5 Writing success status%d", status);
2546
2547         /* setting configuration feature to one */
2548         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2549                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2550         return 0;
2551 error:
2552         for (/* nothing */; i >= 0; i--) {
2553                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2554
2555                 kfree(mos7840_port->dr);
2556                 kfree(mos7840_port->ctrl_buf);
2557                 usb_free_urb(mos7840_port->control_urb);
2558                 kfree(mos7840_port);
2559                 serial->port[i] = NULL;
2560         }
2561         return status;
2562 }
2563
2564 /****************************************************************************
2565  * mos7840_disconnect
2566  *      This function is called whenever the device is removed from the usb bus.
2567  ****************************************************************************/
2568
2569 static void mos7840_disconnect(struct usb_serial *serial)
2570 {
2571         int i;
2572         unsigned long flags;
2573         struct moschip_port *mos7840_port;
2574         dbg("%s", " disconnect :entering..........");
2575
2576         if (!serial) {
2577                 dbg("%s", "Invalid Handler");
2578                 return;
2579         }
2580
2581         /* check for the ports to be closed,close the ports and disconnect */
2582
2583         /* free private structure allocated for serial port  *
2584          * stop reads and writes on all ports                */
2585
2586         for (i = 0; i < serial->num_ports; ++i) {
2587                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2588                 dbg ("mos7840_port %d = %p", i, mos7840_port);
2589                 if (mos7840_port) {
2590                         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2591                         mos7840_port->zombie = 1;
2592                         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2593                         usb_kill_urb(mos7840_port->control_urb);
2594                 }
2595         }
2596
2597         dbg("%s", "Thank u :: ");
2598
2599 }
2600
2601 /****************************************************************************
2602  * mos7840_release
2603  *      This function is called when the usb_serial structure is freed.
2604  ****************************************************************************/
2605
2606 static void mos7840_release(struct usb_serial *serial)
2607 {
2608         int i;
2609         struct moschip_port *mos7840_port;
2610         dbg("%s", " release :entering..........");
2611
2612         if (!serial) {
2613                 dbg("%s", "Invalid Handler");
2614                 return;
2615         }
2616
2617         /* check for the ports to be closed,close the ports and disconnect */
2618
2619         /* free private structure allocated for serial port  *
2620          * stop reads and writes on all ports                */
2621
2622         for (i = 0; i < serial->num_ports; ++i) {
2623                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2624                 dbg("mos7840_port %d = %p", i, mos7840_port);
2625                 if (mos7840_port) {
2626                         kfree(mos7840_port->ctrl_buf);
2627                         kfree(mos7840_port->dr);
2628                         kfree(mos7840_port);
2629                 }
2630         }
2631
2632         dbg("%s", "Thank u :: ");
2633
2634 }
2635
2636 static struct usb_driver io_driver = {
2637         .name = "mos7840",
2638         .probe = usb_serial_probe,
2639         .disconnect = usb_serial_disconnect,
2640         .id_table = moschip_id_table_combined,
2641         .no_dynamic_id = 1,
2642 };
2643
2644 static struct usb_serial_driver moschip7840_4port_device = {
2645         .driver = {
2646                    .owner = THIS_MODULE,
2647                    .name = "mos7840",
2648                    },
2649         .description = DRIVER_DESC,
2650         .usb_driver = &io_driver,
2651         .id_table = moschip_port_id_table,
2652         .num_ports = 4,
2653         .open = mos7840_open,
2654         .close = mos7840_close,
2655         .write = mos7840_write,
2656         .write_room = mos7840_write_room,
2657         .chars_in_buffer = mos7840_chars_in_buffer,
2658         .throttle = mos7840_throttle,
2659         .unthrottle = mos7840_unthrottle,
2660         .calc_num_ports = mos7840_calc_num_ports,
2661 #ifdef MCSSerialProbe
2662         .probe = mos7840_serial_probe,
2663 #endif
2664         .ioctl = mos7840_ioctl,
2665         .set_termios = mos7840_set_termios,
2666         .break_ctl = mos7840_break,
2667         .tiocmget = mos7840_tiocmget,
2668         .tiocmset = mos7840_tiocmset,
2669         .get_icount = mos7840_get_icount,
2670         .attach = mos7840_startup,
2671         .disconnect = mos7840_disconnect,
2672         .release = mos7840_release,
2673         .read_bulk_callback = mos7840_bulk_in_callback,
2674         .read_int_callback = mos7840_interrupt_callback,
2675 };
2676
2677 /****************************************************************************
2678  * moschip7840_init
2679  *      This is called by the module subsystem, or on startup to initialize us
2680  ****************************************************************************/
2681 static int __init moschip7840_init(void)
2682 {
2683         int retval;
2684
2685         dbg("%s", " mos7840_init :entering..........");
2686
2687         /* Register with the usb serial */
2688         retval = usb_serial_register(&moschip7840_4port_device);
2689
2690         if (retval)
2691                 goto failed_port_device_register;
2692
2693         dbg("%s", "Entering...");
2694         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2695                DRIVER_DESC "\n");
2696
2697         /* Register with the usb */
2698         retval = usb_register(&io_driver);
2699         if (retval == 0) {
2700                 dbg("%s", "Leaving...");
2701                 return 0;
2702         }
2703         usb_serial_deregister(&moschip7840_4port_device);
2704 failed_port_device_register:
2705         return retval;
2706 }
2707
2708 /****************************************************************************
2709  * moschip7840_exit
2710  *      Called when the driver is about to be unloaded.
2711  ****************************************************************************/
2712 static void __exit moschip7840_exit(void)
2713 {
2714
2715         dbg("%s", " mos7840_exit :entering..........");
2716
2717         usb_deregister(&io_driver);
2718
2719         usb_serial_deregister(&moschip7840_4port_device);
2720
2721         dbg("%s", "Entering...");
2722 }
2723
2724 module_init(moschip7840_init);
2725 module_exit(moschip7840_exit);
2726
2727 /* Module information */
2728 MODULE_DESCRIPTION(DRIVER_DESC);
2729 MODULE_LICENSE("GPL");
2730
2731 module_param(debug, bool, S_IRUGO | S_IWUSR);
2732 MODULE_PARM_DESC(debug, "Debug enabled or not");