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 #define GPIO_REGISTER              ((__u16)(0x07))
 178
 179 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 180
 181 /*
 182  * URB POOL related defines
 183  */
 184 #define NUM_URBS                        16      /* URB Count */
 185 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 186
 187
 188 static const struct usb_device_id moschip_port_id_table[] = {
 189         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 190         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 191         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
 192         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
 193         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 194         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
 195         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 196         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 197         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 198         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 199         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 200         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
 201         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 202         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
 203         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
 204         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 205         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 206         {}                      /* terminating entry */
 207 };
 208
 209 static const struct usb_device_id moschip_id_table_combined[] __devinitconst = {
 210         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 211         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 212         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
 213         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
 214         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 215         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
 216         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 217         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 218         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 219         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 220         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 221         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
 222         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 223         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
 224         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
 225         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 226         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 227         {}                      /* terminating entry */
 228 };
 229
 230 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
 231
 232 /* This structure holds all of the local port information */
 233
 234 struct moschip_port {
 235         int port_num;           /*Actual port number in the device(1,2,etc) */
 236         struct urb *write_urb;  /* write URB for this port */
 237         struct urb *read_urb;   /* read URB for this port */
 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 status = urb->status;
 508
 509         mos7840_port = urb->context;
 510
 511         switch (status) {
 512         case 0:
 513                 /* success */
 514                 break;
 515         case -ECONNRESET:
 516         case -ENOENT:
 517         case -ESHUTDOWN:
 518                 /* this urb is terminated, clean up */
 519                 dbg("%s - urb shutting down with status: %d", __func__,
 520                     status);
 521                 return;
 522         default:
 523                 dbg("%s - nonzero urb status received: %d", __func__,
 524                     status);
 525                 return;
 526         }
 527
 528         dbg("%s urb buffer size is %d", __func__, urb->actual_length);
 529         dbg("%s mos7840_port->MsrLsr is %d port %d", __func__,
 530             mos7840_port->MsrLsr, mos7840_port->port_num);
 531         data = urb->transfer_buffer;
 532         regval = (__u8) data[0];
 533         dbg("%s data is %x", __func__, regval);
 534         if (mos7840_port->MsrLsr == 0)
 535                 mos7840_handle_new_msr(mos7840_port, regval);
 536         else if (mos7840_port->MsrLsr == 1)
 537                 mos7840_handle_new_lsr(mos7840_port, regval);
 538 }
 539
 540 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 541                            __u16 *val)
 542 {
 543         struct usb_device *dev = mcs->port->serial->dev;
 544         struct usb_ctrlrequest *dr = mcs->dr;
 545         unsigned char *buffer = mcs->ctrl_buf;
 546         int ret;
 547
 548         dr->bRequestType = MCS_RD_RTYPE;
 549         dr->bRequest = MCS_RDREQ;
 550         dr->wValue = cpu_to_le16(Wval); /* 0 */
 551         dr->wIndex = cpu_to_le16(reg);
 552         dr->wLength = cpu_to_le16(2);
 553
 554         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 555                              (unsigned char *)dr, buffer, 2,
 556                              mos7840_control_callback, mcs);
 557         mcs->control_urb->transfer_buffer_length = 2;
 558         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 559         return ret;
 560 }
 561
 562 /*****************************************************************************
 563  * mos7840_interrupt_callback
 564  *      this is the callback function for when we have received data on the
 565  *      interrupt endpoint.
 566  *****************************************************************************/
 567
 568 static void mos7840_interrupt_callback(struct urb *urb)
 569 {
 570         int result;
 571         int length;
 572         struct moschip_port *mos7840_port;
 573         struct usb_serial *serial;
 574         __u16 Data;
 575         unsigned char *data;
 576         __u8 sp[5], st;
 577         int i, rv = 0;
 578         __u16 wval, wreg = 0;
 579         int status = urb->status;
 580
 581         dbg("%s", " : Entering");
 582
 583         switch (status) {
 584         case 0:
 585                 /* success */
 586                 break;
 587         case -ECONNRESET:
 588         case -ENOENT:
 589         case -ESHUTDOWN:
 590                 /* this urb is terminated, clean up */
 591                 dbg("%s - urb shutting down with status: %d", __func__,
 592                     status);
 593                 return;
 594         default:
 595                 dbg("%s - nonzero urb status received: %d", __func__,
 596                     status);
 597                 goto exit;
 598         }
 599
 600         length = urb->actual_length;
 601         data = urb->transfer_buffer;
 602
 603         serial = urb->context;
 604
 605         /* Moschip get 5 bytes
 606          * Byte 1 IIR Port 1 (port.number is 0)
 607          * Byte 2 IIR Port 2 (port.number is 1)
 608          * Byte 3 IIR Port 3 (port.number is 2)
 609          * Byte 4 IIR Port 4 (port.number is 3)
 610          * Byte 5 FIFO status for both */
 611
 612         if (length && length > 5) {
 613                 dbg("%s", "Wrong data !!!");
 614                 return;
 615         }
 616
 617         sp[0] = (__u8) data[0];
 618         sp[1] = (__u8) data[1];
 619         sp[2] = (__u8) data[2];
 620         sp[3] = (__u8) data[3];
 621         st = (__u8) data[4];
 622
 623         for (i = 0; i < serial->num_ports; i++) {
 624                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 625                 wval =
 626                     (((__u16) serial->port[i]->number -
 627                       (__u16) (serial->minor)) + 1) << 8;
 628                 if (mos7840_port->open) {
 629                         if (sp[i] & 0x01) {
 630                                 dbg("SP%d No Interrupt !!!", i);
 631                         } else {
 632                                 switch (sp[i] & 0x0f) {
 633                                 case SERIAL_IIR_RLS:
 634                                         dbg("Serial Port %d: Receiver status error or ", i);
 635                                         dbg("address bit detected in 9-bit mode");
 636                                         mos7840_port->MsrLsr = 1;
 637                                         wreg = LINE_STATUS_REGISTER;
 638                                         break;
 639                                 case SERIAL_IIR_MS:
 640                                         dbg("Serial Port %d: Modem status change", i);
 641                                         mos7840_port->MsrLsr = 0;
 642                                         wreg = MODEM_STATUS_REGISTER;
 643                                         break;
 644                                 }
 645                                 spin_lock(&mos7840_port->pool_lock);
 646                                 if (!mos7840_port->zombie) {
 647                                         rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 648                                 } else {
 649                                         spin_unlock(&mos7840_port->pool_lock);
 650                                         return;
 651                                 }
 652                                 spin_unlock(&mos7840_port->pool_lock);
 653                         }
 654                 }
 655         }
 656         if (!(rv < 0))
 657                 /* the completion handler for the control urb will resubmit */
 658                 return;
 659 exit:
 660         result = usb_submit_urb(urb, GFP_ATOMIC);
 661         if (result) {
 662                 dev_err(&urb->dev->dev,
 663                         "%s - Error %d submitting interrupt urb\n",
 664                         __func__, result);
 665         }
 666 }
 667
 668 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 669                                        const char *function)
 670 {
 671         if (!port) {
 672                 dbg("%s - port == NULL", function);
 673                 return -1;
 674         }
 675         if (!port->serial) {
 676                 dbg("%s - port->serial == NULL", function);
 677                 return -1;
 678         }
 679
 680         return 0;
 681 }
 682
 683 /* Inline functions to check the sanity of a pointer that is passed to us */
 684 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 685                                          const char *function)
 686 {
 687         if (!serial) {
 688                 dbg("%s - serial == NULL", function);
 689                 return -1;
 690         }
 691         if (!serial->type) {
 692                 dbg("%s - serial->type == NULL!", function);
 693                 return -1;
 694         }
 695
 696         return 0;
 697 }
 698
 699 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 700                                                  const char *function)
 701 {
 702         /* if no port was specified, or it fails a paranoia check */
 703         if (!port ||
 704             mos7840_port_paranoia_check(port, function) ||
 705             mos7840_serial_paranoia_check(port->serial, function)) {
 706                 /* then say that we don't have a valid usb_serial thing,
 707                  * which will end up genrating -ENODEV return values */
 708                 return NULL;
 709         }
 710
 711         return port->serial;
 712 }
 713
 714 /*****************************************************************************
 715  * mos7840_bulk_in_callback
 716  *      this is the callback function for when we have received data on the
 717  *      bulk in endpoint.
 718  *****************************************************************************/
 719
 720 static void mos7840_bulk_in_callback(struct urb *urb)
 721 {
 722         int retval;
 723         unsigned char *data;
 724         struct usb_serial *serial;
 725         struct usb_serial_port *port;
 726         struct moschip_port *mos7840_port;
 727         struct tty_struct *tty;
 728         int status = urb->status;
 729
 730         mos7840_port = urb->context;
 731         if (!mos7840_port) {
 732                 dbg("%s", "NULL mos7840_port pointer");
 733                 return;
 734         }
 735
 736         if (status) {
 737                 dbg("nonzero read bulk status received: %d", status);
 738                 mos7840_port->read_urb_busy = false;
 739                 return;
 740         }
 741
 742         port = (struct usb_serial_port *)mos7840_port->port;
 743         if (mos7840_port_paranoia_check(port, __func__)) {
 744                 dbg("%s", "Port Paranoia failed");
 745                 mos7840_port->read_urb_busy = false;
 746                 return;
 747         }
 748
 749         serial = mos7840_get_usb_serial(port, __func__);
 750         if (!serial) {
 751                 dbg("%s", "Bad serial pointer");
 752                 mos7840_port->read_urb_busy = false;
 753                 return;
 754         }
 755
 756         dbg("%s", "Entering... ");
 757
 758         data = urb->transfer_buffer;
 759
 760         dbg("%s", "Entering ...........");
 761
 762         if (urb->actual_length) {
 763                 tty = tty_port_tty_get(&mos7840_port->port->port);
 764                 if (tty) {
 765                         tty_insert_flip_string(tty, data, urb->actual_length);
 766                         dbg(" %s ", data);
 767                         tty_flip_buffer_push(tty);
 768                         tty_kref_put(tty);
 769                 }
 770                 mos7840_port->icount.rx += urb->actual_length;
 771                 smp_wmb();
 772                 dbg("mos7840_port->icount.rx is %d:",
 773                     mos7840_port->icount.rx);
 774         }
 775
 776         if (!mos7840_port->read_urb) {
 777                 dbg("%s", "URB KILLED !!!");
 778                 mos7840_port->read_urb_busy = false;
 779                 return;
 780         }
 781
 782
 783         mos7840_port->read_urb->dev = serial->dev;
 784
 785         mos7840_port->read_urb_busy = true;
 786         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 787
 788         if (retval) {
 789                 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
 790                 mos7840_port->read_urb_busy = false;
 791         }
 792 }
 793
 794 /*****************************************************************************
 795  * mos7840_bulk_out_data_callback
 796  *      this is the callback function for when we have finished sending
 797  *      serial data on the bulk out endpoint.
 798  *****************************************************************************/
 799
 800 static void mos7840_bulk_out_data_callback(struct urb *urb)
 801 {
 802         struct moschip_port *mos7840_port;
 803         struct tty_struct *tty;
 804         int status = urb->status;
 805         int i;
 806
 807         mos7840_port = urb->context;
 808         spin_lock(&mos7840_port->pool_lock);
 809         for (i = 0; i < NUM_URBS; i++) {
 810                 if (urb == mos7840_port->write_urb_pool[i]) {
 811                         mos7840_port->busy[i] = 0;
 812                         break;
 813                 }
 814         }
 815         spin_unlock(&mos7840_port->pool_lock);
 816
 817         if (status) {
 818                 dbg("nonzero write bulk status received:%d", status);
 819                 return;
 820         }
 821
 822         if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
 823                 dbg("%s", "Port Paranoia failed");
 824                 return;
 825         }
 826
 827         dbg("%s", "Entering .........");
 828
 829         tty = tty_port_tty_get(&mos7840_port->port->port);
 830         if (tty && mos7840_port->open)
 831                 tty_wakeup(tty);
 832         tty_kref_put(tty);
 833
 834 }
 835
 836 /************************************************************************/
 837 /*       D R I V E R  T T Y  I N T E R F A C E  F U N C T I O N S       */
 838 /************************************************************************/
 839 #ifdef MCSSerialProbe
 840 static int mos7840_serial_probe(struct usb_serial *serial,
 841                                 const struct usb_device_id *id)
 842 {
 843
 844         /*need to implement the mode_reg reading and updating\
 845            structures usb_serial_ device_type\
 846            (i.e num_ports, num_bulkin,bulkout etc) */
 847         /* Also we can update the changes  attach */
 848         return 1;
 849 }
 850 #endif
 851
 852 /*****************************************************************************
 853  * mos7840_open
 854  *      this function is called by the tty driver when a port is opened
 855  *      If successful, we return 0
 856  *      Otherwise we return a negative error number.
 857  *****************************************************************************/
 858
 859 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
 860 {
 861         int response;
 862         int j;
 863         struct usb_serial *serial;
 864         struct urb *urb;
 865         __u16 Data;
 866         int status;
 867         struct moschip_port *mos7840_port;
 868         struct moschip_port *port0;
 869
 870         dbg ("%s enter", __func__);
 871
 872         if (mos7840_port_paranoia_check(port, __func__)) {
 873                 dbg("%s", "Port Paranoia failed");
 874                 return -ENODEV;
 875         }
 876
 877         serial = port->serial;
 878
 879         if (mos7840_serial_paranoia_check(serial, __func__)) {
 880                 dbg("%s", "Serial Paranoia failed");
 881                 return -ENODEV;
 882         }
 883
 884         mos7840_port = mos7840_get_port_private(port);
 885         port0 = mos7840_get_port_private(serial->port[0]);
 886
 887         if (mos7840_port == NULL || port0 == NULL)
 888                 return -ENODEV;
 889
 890         usb_clear_halt(serial->dev, port->write_urb->pipe);
 891         usb_clear_halt(serial->dev, port->read_urb->pipe);
 892         port0->open_ports++;
 893
 894         /* Initialising the write urb pool */
 895         for (j = 0; j < NUM_URBS; ++j) {
 896                 urb = usb_alloc_urb(0, GFP_KERNEL);
 897                 mos7840_port->write_urb_pool[j] = urb;
 898
 899                 if (urb == NULL) {
 900                         dev_err(&port->dev, "No more urbs???\n");
 901                         continue;
 902                 }
 903
 904                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 905                                                                 GFP_KERNEL);
 906                 if (!urb->transfer_buffer) {
 907                         usb_free_urb(urb);
 908                         mos7840_port->write_urb_pool[j] = NULL;
 909                         dev_err(&port->dev,
 910                                 "%s-out of memory for urb buffers.\n",
 911                                 __func__);
 912                         continue;
 913                 }
 914         }
 915
 916 /*****************************************************************************
 917  * Initialize MCS7840 -- Write Init values to corresponding Registers
 918  *
 919  * Register Index
 920  * 1 : IER
 921  * 2 : FCR
 922  * 3 : LCR
 923  * 4 : MCR
 924  *
 925  * 0x08 : SP1/2 Control Reg
 926  *****************************************************************************/
 927
 928         /* NEED to check the following Block */
 929
 930         Data = 0x0;
 931         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 932         if (status < 0) {
 933                 dbg("Reading Spreg failed");
 934                 return -1;
 935         }
 936         Data |= 0x80;
 937         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 938         if (status < 0) {
 939                 dbg("writing Spreg failed");
 940                 return -1;
 941         }
 942
 943         Data &= ~0x80;
 944         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 945         if (status < 0) {
 946                 dbg("writing Spreg failed");
 947                 return -1;
 948         }
 949         /* End of block to be checked */
 950
 951         Data = 0x0;
 952         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 953                                                                         &Data);
 954         if (status < 0) {
 955                 dbg("Reading Controlreg failed");
 956                 return -1;
 957         }
 958         Data |= 0x08;           /* Driver done bit */
 959         Data |= 0x20;           /* rx_disable */
 960         status = mos7840_set_reg_sync(port,
 961                                 mos7840_port->ControlRegOffset, Data);
 962         if (status < 0) {
 963                 dbg("writing Controlreg failed");
 964                 return -1;
 965         }
 966         /* do register settings here */
 967         /* Set all regs to the device default values. */
 968         /***********************************
 969          * First Disable all interrupts.
 970          ***********************************/
 971         Data = 0x00;
 972         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 973         if (status < 0) {
 974                 dbg("disabling interrupts failed");
 975                 return -1;
 976         }
 977         /* Set FIFO_CONTROL_REGISTER to the default value */
 978         Data = 0x00;
 979         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 980         if (status < 0) {
 981                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
 982                 return -1;
 983         }
 984
 985         Data = 0xcf;
 986         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 987         if (status < 0) {
 988                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
 989                 return -1;
 990         }
 991
 992         Data = 0x03;
 993         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 994         mos7840_port->shadowLCR = Data;
 995
 996         Data = 0x0b;
 997         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
 998         mos7840_port->shadowMCR = Data;
 999
1000         Data = 0x00;
1001         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1002         mos7840_port->shadowLCR = Data;
1003
1004         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1005         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1006
1007         Data = 0x0c;
1008         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1009
1010         Data = 0x0;
1011         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1012
1013         Data = 0x00;
1014         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1015
1016         Data = Data & ~SERIAL_LCR_DLAB;
1017         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1018         mos7840_port->shadowLCR = Data;
1019
1020         /* clearing Bulkin and Bulkout Fifo */
1021         Data = 0x0;
1022         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1023
1024         Data = Data | 0x0c;
1025         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1026
1027         Data = Data & ~0x0c;
1028         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1029         /* Finally enable all interrupts */
1030         Data = 0x0c;
1031         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1032
1033         /* clearing rx_disable */
1034         Data = 0x0;
1035         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1036                                                                         &Data);
1037         Data = Data & ~0x20;
1038         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1039                                                                         Data);
1040
1041         /* rx_negate */
1042         Data = 0x0;
1043         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1044                                                                         &Data);
1045         Data = Data | 0x10;
1046         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1047                                                                         Data);
1048
1049         /* Check to see if we've set up our endpoint info yet    *
1050          * (can't set it up in mos7840_startup as the structures *
1051          * were not set up at that time.)                        */
1052         if (port0->open_ports == 1) {
1053                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1054                         /* set up interrupt urb */
1055                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1056                                 serial->dev,
1057                                 usb_rcvintpipe(serial->dev,
1058                                 serial->port[0]->interrupt_in_endpointAddress),
1059                                 serial->port[0]->interrupt_in_buffer,
1060                                 serial->port[0]->interrupt_in_urb->
1061                                 transfer_buffer_length,
1062                                 mos7840_interrupt_callback,
1063                                 serial,
1064                                 serial->port[0]->interrupt_in_urb->interval);
1065
1066                         /* start interrupt read for mos7840               *
1067                          * will continue as long as mos7840 is connected  */
1068
1069                         response =
1070                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1071                                            GFP_KERNEL);
1072                         if (response) {
1073                                 dev_err(&port->dev, "%s - Error %d submitting "
1074                                         "interrupt urb\n", __func__, response);
1075                         }
1076
1077                 }
1078
1079         }
1080
1081         /* see if we've set up our endpoint info yet   *
1082          * (can't set it up in mos7840_startup as the  *
1083          * structures were not set up at that time.)   */
1084
1085         dbg("port number is %d", port->number);
1086         dbg("serial number is %d", port->serial->minor);
1087         dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
1088         dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
1089         dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
1090         dbg("port's number in the device is %d", mos7840_port->port_num);
1091         mos7840_port->read_urb = port->read_urb;
1092
1093         /* set up our bulk in urb */
1094         if ((serial->num_ports == 2)
1095                 && ((((__u16)port->number -
1096                         (__u16)(port->serial->minor)) % 2) != 0)) {
1097                 usb_fill_bulk_urb(mos7840_port->read_urb,
1098                         serial->dev,
1099                         usb_rcvbulkpipe(serial->dev,
1100                                 (port->bulk_in_endpointAddress) + 2),
1101                         port->bulk_in_buffer,
1102                         mos7840_port->read_urb->transfer_buffer_length,
1103                         mos7840_bulk_in_callback, mos7840_port);
1104         } else {
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
1114         dbg("mos7840_open: bulkin endpoint is %d",
1115             port->bulk_in_endpointAddress);
1116         mos7840_port->read_urb_busy = true;
1117         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1118         if (response) {
1119                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1120                         __func__, response);
1121                 mos7840_port->read_urb_busy = false;
1122         }
1123
1124         /* initialize our wait queues */
1125         init_waitqueue_head(&mos7840_port->wait_chase);
1126         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1127
1128         /* initialize our icount structure */
1129         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1130
1131         /* initialize our port settings */
1132         /* Must set to enable ints! */
1133         mos7840_port->shadowMCR = MCR_MASTER_IE;
1134         /* send a open port command */
1135         mos7840_port->open = 1;
1136         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1137         mos7840_port->icount.tx = 0;
1138         mos7840_port->icount.rx = 0;
1139
1140         dbg("usb_serial serial:%p       mos7840_port:%p\n      usb_serial_port port:%p",
1141                                 serial, mos7840_port, port);
1142
1143         dbg ("%s leave", __func__);
1144
1145         return 0;
1146
1147 }
1148
1149 /*****************************************************************************
1150  * mos7840_chars_in_buffer
1151  *      this function is called by the tty driver when it wants to know how many
1152  *      bytes of data we currently have outstanding in the port (data that has
1153  *      been written, but hasn't made it out the port yet)
1154  *      If successful, we return the number of bytes left to be written in the
1155  *      system,
1156  *      Otherwise we return zero.
1157  *****************************************************************************/
1158
1159 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1160 {
1161         struct usb_serial_port *port = tty->driver_data;
1162         int i;
1163         int chars = 0;
1164         unsigned long flags;
1165         struct moschip_port *mos7840_port;
1166
1167         dbg("%s", " mos7840_chars_in_buffer:entering ...........");
1168
1169         if (mos7840_port_paranoia_check(port, __func__)) {
1170                 dbg("%s", "Invalid port");
1171                 return 0;
1172         }
1173
1174         mos7840_port = mos7840_get_port_private(port);
1175         if (mos7840_port == NULL) {
1176                 dbg("%s", "mos7840_break:leaving ...........");
1177                 return 0;
1178         }
1179
1180         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1181         for (i = 0; i < NUM_URBS; ++i) {
1182                 if (mos7840_port->busy[i]) {
1183                         struct urb *urb = mos7840_port->write_urb_pool[i];
1184                         chars += urb->transfer_buffer_length;
1185                 }
1186         }
1187         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1188         dbg("%s - returns %d", __func__, chars);
1189         return chars;
1190
1191 }
1192
1193 /*****************************************************************************
1194  * mos7840_close
1195  *      this function is called by the tty driver when a port is closed
1196  *****************************************************************************/
1197
1198 static void mos7840_close(struct usb_serial_port *port)
1199 {
1200         struct usb_serial *serial;
1201         struct moschip_port *mos7840_port;
1202         struct moschip_port *port0;
1203         int j;
1204         __u16 Data;
1205
1206         dbg("%s", "mos7840_close:entering...");
1207
1208         if (mos7840_port_paranoia_check(port, __func__)) {
1209                 dbg("%s", "Port Paranoia failed");
1210                 return;
1211         }
1212
1213         serial = mos7840_get_usb_serial(port, __func__);
1214         if (!serial) {
1215                 dbg("%s", "Serial Paranoia failed");
1216                 return;
1217         }
1218
1219         mos7840_port = mos7840_get_port_private(port);
1220         port0 = mos7840_get_port_private(serial->port[0]);
1221
1222         if (mos7840_port == NULL || port0 == NULL)
1223                 return;
1224
1225         for (j = 0; j < NUM_URBS; ++j)
1226                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1227
1228         /* Freeing Write URBs */
1229         for (j = 0; j < NUM_URBS; ++j) {
1230                 if (mos7840_port->write_urb_pool[j]) {
1231                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1232                                 kfree(mos7840_port->write_urb_pool[j]->
1233                                       transfer_buffer);
1234
1235                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1236                 }
1237         }
1238
1239         /* While closing port, shutdown all bulk read, write  *
1240          * and interrupt read if they exists                  */
1241         if (serial->dev) {
1242                 if (mos7840_port->write_urb) {
1243                         dbg("%s", "Shutdown bulk write");
1244                         usb_kill_urb(mos7840_port->write_urb);
1245                 }
1246                 if (mos7840_port->read_urb) {
1247                         dbg("%s", "Shutdown bulk read");
1248                         usb_kill_urb(mos7840_port->read_urb);
1249                         mos7840_port->read_urb_busy = false;
1250                 }
1251                 if ((&mos7840_port->control_urb)) {
1252                         dbg("%s", "Shutdown control read");
1253                         /*/      usb_kill_urb (mos7840_port->control_urb); */
1254                 }
1255         }
1256 /*      if(mos7840_port->ctrl_buf != NULL) */
1257 /*              kfree(mos7840_port->ctrl_buf); */
1258         port0->open_ports--;
1259         dbg("mos7840_num_open_ports in close%d:in port%d",
1260             port0->open_ports, port->number);
1261         if (port0->open_ports == 0) {
1262                 if (serial->port[0]->interrupt_in_urb) {
1263                         dbg("%s", "Shutdown interrupt_in_urb");
1264                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1265                 }
1266         }
1267
1268         if (mos7840_port->write_urb) {
1269                 /* if this urb had a transfer buffer already (old tx) free it */
1270                 if (mos7840_port->write_urb->transfer_buffer != NULL)
1271                         kfree(mos7840_port->write_urb->transfer_buffer);
1272                 usb_free_urb(mos7840_port->write_urb);
1273         }
1274
1275         Data = 0x0;
1276         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1277
1278         Data = 0x00;
1279         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1280
1281         mos7840_port->open = 0;
1282
1283         dbg("%s", "Leaving ............");
1284 }
1285
1286 /************************************************************************
1287  *
1288  * mos7840_block_until_chase_response
1289  *
1290  *      This function will block the close until one of the following:
1291  *              1. Response to our Chase comes from mos7840
1292  *              2. A timeout of 10 seconds without activity has expired
1293  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1294  *
1295  ************************************************************************/
1296
1297 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1298                                         struct moschip_port *mos7840_port)
1299 {
1300         int timeout = 1 * HZ;
1301         int wait = 10;
1302         int count;
1303
1304         while (1) {
1305                 count = mos7840_chars_in_buffer(tty);
1306
1307                 /* Check for Buffer status */
1308                 if (count <= 0)
1309                         return;
1310
1311                 /* Block the thread for a while */
1312                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1313                                                timeout);
1314                 /* No activity.. count down section */
1315                 wait--;
1316                 if (wait == 0) {
1317                         dbg("%s - TIMEOUT", __func__);
1318                         return;
1319                 } else {
1320                         /* Reset timeout value back to seconds */
1321                         wait = 10;
1322                 }
1323         }
1324
1325 }
1326
1327 /*****************************************************************************
1328  * mos7840_break
1329  *      this function sends a break to the port
1330  *****************************************************************************/
1331 static void mos7840_break(struct tty_struct *tty, int break_state)
1332 {
1333         struct usb_serial_port *port = tty->driver_data;
1334         unsigned char data;
1335         struct usb_serial *serial;
1336         struct moschip_port *mos7840_port;
1337
1338         dbg("%s", "Entering ...........");
1339         dbg("mos7840_break: Start");
1340
1341         if (mos7840_port_paranoia_check(port, __func__)) {
1342                 dbg("%s", "Port Paranoia failed");
1343                 return;
1344         }
1345
1346         serial = mos7840_get_usb_serial(port, __func__);
1347         if (!serial) {
1348                 dbg("%s", "Serial Paranoia failed");
1349                 return;
1350         }
1351
1352         mos7840_port = mos7840_get_port_private(port);
1353
1354         if (mos7840_port == NULL)
1355                 return;
1356
1357         if (serial->dev)
1358                 /* flush and block until tx is empty */
1359                 mos7840_block_until_chase_response(tty, mos7840_port);
1360
1361         if (break_state == -1)
1362                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1363         else
1364                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1365
1366         /* FIXME: no locking on shadowLCR anywhere in driver */
1367         mos7840_port->shadowLCR = data;
1368         dbg("mcs7840_break mos7840_port->shadowLCR is %x",
1369             mos7840_port->shadowLCR);
1370         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1371                              mos7840_port->shadowLCR);
1372 }
1373
1374 /*****************************************************************************
1375  * mos7840_write_room
1376  *      this function is called by the tty driver when it wants to know how many
1377  *      bytes of data we can accept for a specific port.
1378  *      If successful, we return the amount of room that we have for this port
1379  *      Otherwise we return a negative error number.
1380  *****************************************************************************/
1381
1382 static int mos7840_write_room(struct tty_struct *tty)
1383 {
1384         struct usb_serial_port *port = tty->driver_data;
1385         int i;
1386         int room = 0;
1387         unsigned long flags;
1388         struct moschip_port *mos7840_port;
1389
1390         dbg("%s", " mos7840_write_room:entering ...........");
1391
1392         if (mos7840_port_paranoia_check(port, __func__)) {
1393                 dbg("%s", "Invalid port");
1394                 dbg("%s", " mos7840_write_room:leaving ...........");
1395                 return -1;
1396         }
1397
1398         mos7840_port = mos7840_get_port_private(port);
1399         if (mos7840_port == NULL) {
1400                 dbg("%s", "mos7840_break:leaving ...........");
1401                 return -1;
1402         }
1403
1404         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1405         for (i = 0; i < NUM_URBS; ++i) {
1406                 if (!mos7840_port->busy[i])
1407                         room += URB_TRANSFER_BUFFER_SIZE;
1408         }
1409         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1410
1411         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1412         dbg("%s - returns %d", __func__, room);
1413         return room;
1414
1415 }
1416
1417 /*****************************************************************************
1418  * mos7840_write
1419  *      this function is called by the tty driver when data should be written to
1420  *      the port.
1421  *      If successful, we return the number of bytes written, otherwise we
1422  *      return a negative error number.
1423  *****************************************************************************/
1424
1425 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1426                          const unsigned char *data, int count)
1427 {
1428         int status;
1429         int i;
1430         int bytes_sent = 0;
1431         int transfer_size;
1432         unsigned long flags;
1433
1434         struct moschip_port *mos7840_port;
1435         struct usb_serial *serial;
1436         struct urb *urb;
1437         /* __u16 Data; */
1438         const unsigned char *current_position = data;
1439         unsigned char *data1;
1440         dbg("%s", "entering ...........");
1441         /* dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1442                                         mos7840_port->shadowLCR); */
1443
1444 #ifdef NOTMOS7840
1445         Data = 0x00;
1446         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1447         mos7840_port->shadowLCR = Data;
1448         dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
1449         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1450             mos7840_port->shadowLCR);
1451
1452         /* Data = 0x03; */
1453         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1454         /* mos7840_port->shadowLCR=Data;//Need to add later */
1455
1456         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1457         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1458
1459         /* Data = 0x0c; */
1460         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1461         Data = 0x00;
1462         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1463         dbg("mos7840_write:DLL value is %x", Data);
1464
1465         Data = 0x0;
1466         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1467         dbg("mos7840_write:DLM value is %x", Data);
1468
1469         Data = Data & ~SERIAL_LCR_DLAB;
1470         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1471             mos7840_port->shadowLCR);
1472         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1473 #endif
1474
1475         if (mos7840_port_paranoia_check(port, __func__)) {
1476                 dbg("%s", "Port Paranoia failed");
1477                 return -1;
1478         }
1479
1480         serial = port->serial;
1481         if (mos7840_serial_paranoia_check(serial, __func__)) {
1482                 dbg("%s", "Serial Paranoia failed");
1483                 return -1;
1484         }
1485
1486         mos7840_port = mos7840_get_port_private(port);
1487         if (mos7840_port == NULL) {
1488                 dbg("%s", "mos7840_port is NULL");
1489                 return -1;
1490         }
1491
1492         /* try to find a free urb in the list */
1493         urb = NULL;
1494
1495         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1496         for (i = 0; i < NUM_URBS; ++i) {
1497                 if (!mos7840_port->busy[i]) {
1498                         mos7840_port->busy[i] = 1;
1499                         urb = mos7840_port->write_urb_pool[i];
1500                         dbg("URB:%d", i);
1501                         break;
1502                 }
1503         }
1504         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1505
1506         if (urb == NULL) {
1507                 dbg("%s - no more free urbs", __func__);
1508                 goto exit;
1509         }
1510
1511         if (urb->transfer_buffer == NULL) {
1512                 urb->transfer_buffer =
1513                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1514
1515                 if (urb->transfer_buffer == NULL) {
1516                         dev_err(&port->dev, "%s no more kernel memory...\n",
1517                                 __func__);
1518                         goto exit;
1519                 }
1520         }
1521         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1522
1523         memcpy(urb->transfer_buffer, current_position, transfer_size);
1524
1525         /* fill urb with data and submit  */
1526         if ((serial->num_ports == 2)
1527                 && ((((__u16)port->number -
1528                         (__u16)(port->serial->minor)) % 2) != 0)) {
1529                 usb_fill_bulk_urb(urb,
1530                         serial->dev,
1531                         usb_sndbulkpipe(serial->dev,
1532                                 (port->bulk_out_endpointAddress) + 2),
1533                         urb->transfer_buffer,
1534                         transfer_size,
1535                         mos7840_bulk_out_data_callback, mos7840_port);
1536         } else {
1537                 usb_fill_bulk_urb(urb,
1538                         serial->dev,
1539                         usb_sndbulkpipe(serial->dev,
1540                                 port->bulk_out_endpointAddress),
1541                         urb->transfer_buffer,
1542                         transfer_size,
1543                         mos7840_bulk_out_data_callback, mos7840_port);
1544         }
1545
1546         data1 = urb->transfer_buffer;
1547         dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
1548
1549         /* send it down the pipe */
1550         status = usb_submit_urb(urb, GFP_ATOMIC);
1551
1552         if (status) {
1553                 mos7840_port->busy[i] = 0;
1554                 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1555                         "with status = %d\n", __func__, status);
1556                 bytes_sent = status;
1557                 goto exit;
1558         }
1559         bytes_sent = transfer_size;
1560         mos7840_port->icount.tx += transfer_size;
1561         smp_wmb();
1562         dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
1563 exit:
1564         return bytes_sent;
1565
1566 }
1567
1568 /*****************************************************************************
1569  * mos7840_throttle
1570  *      this function is called by the tty driver when it wants to stop the data
1571  *      being read from the port.
1572  *****************************************************************************/
1573
1574 static void mos7840_throttle(struct tty_struct *tty)
1575 {
1576         struct usb_serial_port *port = tty->driver_data;
1577         struct moschip_port *mos7840_port;
1578         int status;
1579
1580         if (mos7840_port_paranoia_check(port, __func__)) {
1581                 dbg("%s", "Invalid port");
1582                 return;
1583         }
1584
1585         dbg("- port %d", port->number);
1586
1587         mos7840_port = mos7840_get_port_private(port);
1588
1589         if (mos7840_port == NULL)
1590                 return;
1591
1592         if (!mos7840_port->open) {
1593                 dbg("%s", "port not opened");
1594                 return;
1595         }
1596
1597         dbg("%s", "Entering ..........");
1598
1599         /* if we are implementing XON/XOFF, send the stop character */
1600         if (I_IXOFF(tty)) {
1601                 unsigned char stop_char = STOP_CHAR(tty);
1602                 status = mos7840_write(tty, port, &stop_char, 1);
1603                 if (status <= 0)
1604                         return;
1605         }
1606         /* if we are implementing RTS/CTS, toggle that line */
1607         if (tty->termios->c_cflag & CRTSCTS) {
1608                 mos7840_port->shadowMCR &= ~MCR_RTS;
1609                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1610                                          mos7840_port->shadowMCR);
1611                 if (status < 0)
1612                         return;
1613         }
1614 }
1615
1616 /*****************************************************************************
1617  * mos7840_unthrottle
1618  *      this function is called by the tty driver when it wants to resume
1619  *      the data being read from the port (called after mos7840_throttle is
1620  *      called)
1621  *****************************************************************************/
1622 static void mos7840_unthrottle(struct tty_struct *tty)
1623 {
1624         struct usb_serial_port *port = tty->driver_data;
1625         int status;
1626         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1627
1628         if (mos7840_port_paranoia_check(port, __func__)) {
1629                 dbg("%s", "Invalid port");
1630                 return;
1631         }
1632
1633         if (mos7840_port == NULL)
1634                 return;
1635
1636         if (!mos7840_port->open) {
1637                 dbg("%s - port not opened", __func__);
1638                 return;
1639         }
1640
1641         dbg("%s", "Entering ..........");
1642
1643         /* if we are implementing XON/XOFF, send the start character */
1644         if (I_IXOFF(tty)) {
1645                 unsigned char start_char = START_CHAR(tty);
1646                 status = mos7840_write(tty, port, &start_char, 1);
1647                 if (status <= 0)
1648                         return;
1649         }
1650
1651         /* if we are implementing RTS/CTS, toggle that line */
1652         if (tty->termios->c_cflag & CRTSCTS) {
1653                 mos7840_port->shadowMCR |= MCR_RTS;
1654                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1655                                          mos7840_port->shadowMCR);
1656                 if (status < 0)
1657                         return;
1658         }
1659 }
1660
1661 static int mos7840_tiocmget(struct tty_struct *tty)
1662 {
1663         struct usb_serial_port *port = tty->driver_data;
1664         struct moschip_port *mos7840_port;
1665         unsigned int result;
1666         __u16 msr;
1667         __u16 mcr;
1668         int status;
1669         mos7840_port = mos7840_get_port_private(port);
1670
1671         dbg("%s - port %d", __func__, port->number);
1672
1673         if (mos7840_port == NULL)
1674                 return -ENODEV;
1675
1676         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1677         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1678         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1679             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1680             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1681             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1682             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1683             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1684             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1685
1686         dbg("%s - 0x%04X", __func__, result);
1687
1688         return result;
1689 }
1690
1691 static int mos7840_tiocmset(struct tty_struct *tty,
1692                             unsigned int set, unsigned int clear)
1693 {
1694         struct usb_serial_port *port = tty->driver_data;
1695         struct moschip_port *mos7840_port;
1696         unsigned int mcr;
1697         int status;
1698
1699         dbg("%s - port %d", __func__, port->number);
1700
1701         mos7840_port = mos7840_get_port_private(port);
1702
1703         if (mos7840_port == NULL)
1704                 return -ENODEV;
1705
1706         /* FIXME: What locks the port registers ? */
1707         mcr = mos7840_port->shadowMCR;
1708         if (clear & TIOCM_RTS)
1709                 mcr &= ~MCR_RTS;
1710         if (clear & TIOCM_DTR)
1711                 mcr &= ~MCR_DTR;
1712         if (clear & TIOCM_LOOP)
1713                 mcr &= ~MCR_LOOPBACK;
1714
1715         if (set & TIOCM_RTS)
1716                 mcr |= MCR_RTS;
1717         if (set & TIOCM_DTR)
1718                 mcr |= MCR_DTR;
1719         if (set & TIOCM_LOOP)
1720                 mcr |= MCR_LOOPBACK;
1721
1722         mos7840_port->shadowMCR = mcr;
1723
1724         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1725         if (status < 0) {
1726                 dbg("setting MODEM_CONTROL_REGISTER Failed");
1727                 return status;
1728         }
1729
1730         return 0;
1731 }
1732
1733 /*****************************************************************************
1734  * mos7840_calc_baud_rate_divisor
1735  *      this function calculates the proper baud rate divisor for the specified
1736  *      baud rate.
1737  *****************************************************************************/
1738 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1739                                           __u16 *clk_sel_val)
1740 {
1741
1742         dbg("%s - %d", __func__, baudRate);
1743
1744         if (baudRate <= 115200) {
1745                 *divisor = 115200 / baudRate;
1746                 *clk_sel_val = 0x0;
1747         }
1748         if ((baudRate > 115200) && (baudRate <= 230400)) {
1749                 *divisor = 230400 / baudRate;
1750                 *clk_sel_val = 0x10;
1751         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1752                 *divisor = 403200 / baudRate;
1753                 *clk_sel_val = 0x20;
1754         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1755                 *divisor = 460800 / baudRate;
1756                 *clk_sel_val = 0x30;
1757         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1758                 *divisor = 806400 / baudRate;
1759                 *clk_sel_val = 0x40;
1760         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1761                 *divisor = 921600 / baudRate;
1762                 *clk_sel_val = 0x50;
1763         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1764                 *divisor = 1572864 / baudRate;
1765                 *clk_sel_val = 0x60;
1766         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1767                 *divisor = 3145728 / baudRate;
1768                 *clk_sel_val = 0x70;
1769         }
1770         return 0;
1771
1772 #ifdef NOTMCS7840
1773
1774         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1775                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1776                         *divisor = mos7840_divisor_table[i].Divisor;
1777                         return 0;
1778                 }
1779         }
1780
1781         /* After trying for all the standard baud rates    *
1782          * Try calculating the divisor for this baud rate  */
1783
1784         if (baudrate > 75 && baudrate < 230400) {
1785                 /* get the divisor */
1786                 custom = (__u16) (230400L / baudrate);
1787
1788                 /* Check for round off */
1789                 round1 = (__u16) (2304000L / baudrate);
1790                 round = (__u16) (round1 - (custom * 10));
1791                 if (round > 4)
1792                         custom++;
1793                 *divisor = custom;
1794
1795                 dbg(" Baud %d = %d", baudrate, custom);
1796                 return 0;
1797         }
1798
1799         dbg("%s", " Baud calculation Failed...");
1800         return -1;
1801 #endif
1802 }
1803
1804 /*****************************************************************************
1805  * mos7840_send_cmd_write_baud_rate
1806  *      this function sends the proper command to change the baud rate of the
1807  *      specified port.
1808  *****************************************************************************/
1809
1810 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1811                                             int baudRate)
1812 {
1813         int divisor = 0;
1814         int status;
1815         __u16 Data;
1816         unsigned char number;
1817         __u16 clk_sel_val;
1818         struct usb_serial_port *port;
1819
1820         if (mos7840_port == NULL)
1821                 return -1;
1822
1823         port = (struct usb_serial_port *)mos7840_port->port;
1824         if (mos7840_port_paranoia_check(port, __func__)) {
1825                 dbg("%s", "Invalid port");
1826                 return -1;
1827         }
1828
1829         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1830                 dbg("%s", "Invalid Serial");
1831                 return -1;
1832         }
1833
1834         dbg("%s", "Entering ..........");
1835
1836         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1837
1838         dbg("%s - port = %d, baud = %d", __func__,
1839             mos7840_port->port->number, baudRate);
1840         /* reset clk_uart_sel in spregOffset */
1841         if (baudRate > 115200) {
1842 #ifdef HW_flow_control
1843                 /* NOTE: need to see the pther register to modify */
1844                 /* setting h/w flow control bit to 1 */
1845                 Data = 0x2b;
1846                 mos7840_port->shadowMCR = Data;
1847                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1848                                                                         Data);
1849                 if (status < 0) {
1850                         dbg("Writing spreg failed in set_serial_baud");
1851                         return -1;
1852                 }
1853 #endif
1854
1855         } else {
1856 #ifdef HW_flow_control
1857                 /* setting h/w flow control bit to 0 */
1858                 Data = 0xb;
1859                 mos7840_port->shadowMCR = Data;
1860                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1861                                                                         Data);
1862                 if (status < 0) {
1863                         dbg("Writing spreg failed in set_serial_baud");
1864                         return -1;
1865                 }
1866 #endif
1867
1868         }
1869
1870         if (1) {                /* baudRate <= 115200) */
1871                 clk_sel_val = 0x0;
1872                 Data = 0x0;
1873                 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1874                                                    &clk_sel_val);
1875                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1876                                                                  &Data);
1877                 if (status < 0) {
1878                         dbg("reading spreg failed in set_serial_baud");
1879                         return -1;
1880                 }
1881                 Data = (Data & 0x8f) | clk_sel_val;
1882                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1883                                                                 Data);
1884                 if (status < 0) {
1885                         dbg("Writing spreg failed in set_serial_baud");
1886                         return -1;
1887                 }
1888                 /* Calculate the Divisor */
1889
1890                 if (status) {
1891                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1892                         return status;
1893                 }
1894                 /* Enable access to divisor latch */
1895                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1896                 mos7840_port->shadowLCR = Data;
1897                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1898
1899                 /* Write the divisor */
1900                 Data = (unsigned char)(divisor & 0xff);
1901                 dbg("set_serial_baud Value to write DLL is %x", Data);
1902                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1903
1904                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1905                 dbg("set_serial_baud Value to write DLM is %x", Data);
1906                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1907
1908                 /* Disable access to divisor latch */
1909                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1910                 mos7840_port->shadowLCR = Data;
1911                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1912
1913         }
1914         return status;
1915 }
1916
1917 /*****************************************************************************
1918  * mos7840_change_port_settings
1919  *      This routine is called to set the UART on the device to match
1920  *      the specified new settings.
1921  *****************************************************************************/
1922
1923 static void mos7840_change_port_settings(struct tty_struct *tty,
1924         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1925 {
1926         int baud;
1927         unsigned cflag;
1928         unsigned iflag;
1929         __u8 lData;
1930         __u8 lParity;
1931         __u8 lStop;
1932         int status;
1933         __u16 Data;
1934         struct usb_serial_port *port;
1935         struct usb_serial *serial;
1936
1937         if (mos7840_port == NULL)
1938                 return;
1939
1940         port = (struct usb_serial_port *)mos7840_port->port;
1941
1942         if (mos7840_port_paranoia_check(port, __func__)) {
1943                 dbg("%s", "Invalid port");
1944                 return;
1945         }
1946
1947         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1948                 dbg("%s", "Invalid Serial");
1949                 return;
1950         }
1951
1952         serial = port->serial;
1953
1954         dbg("%s - port %d", __func__, mos7840_port->port->number);
1955
1956         if (!mos7840_port->open) {
1957                 dbg("%s - port not opened", __func__);
1958                 return;
1959         }
1960
1961         dbg("%s", "Entering ..........");
1962
1963         lData = LCR_BITS_8;
1964         lStop = LCR_STOP_1;
1965         lParity = LCR_PAR_NONE;
1966
1967         cflag = tty->termios->c_cflag;
1968         iflag = tty->termios->c_iflag;
1969
1970         /* Change the number of bits */
1971         if (cflag & CSIZE) {
1972                 switch (cflag & CSIZE) {
1973                 case CS5:
1974                         lData = LCR_BITS_5;
1975                         break;
1976
1977                 case CS6:
1978                         lData = LCR_BITS_6;
1979                         break;
1980
1981                 case CS7:
1982                         lData = LCR_BITS_7;
1983                         break;
1984                 default:
1985                 case CS8:
1986                         lData = LCR_BITS_8;
1987                         break;
1988                 }
1989         }
1990         /* Change the Parity bit */
1991         if (cflag & PARENB) {
1992                 if (cflag & PARODD) {
1993                         lParity = LCR_PAR_ODD;
1994                         dbg("%s - parity = odd", __func__);
1995                 } else {
1996                         lParity = LCR_PAR_EVEN;
1997                         dbg("%s - parity = even", __func__);
1998                 }
1999
2000         } else {
2001                 dbg("%s - parity = none", __func__);
2002         }
2003
2004         if (cflag & CMSPAR)
2005                 lParity = lParity | 0x20;
2006
2007         /* Change the Stop bit */
2008         if (cflag & CSTOPB) {
2009                 lStop = LCR_STOP_2;
2010                 dbg("%s - stop bits = 2", __func__);
2011         } else {
2012                 lStop = LCR_STOP_1;
2013                 dbg("%s - stop bits = 1", __func__);
2014         }
2015
2016         /* Update the LCR with the correct value */
2017         mos7840_port->shadowLCR &=
2018             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
2019         mos7840_port->shadowLCR |= (lData | lParity | lStop);
2020
2021         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
2022             mos7840_port->shadowLCR);
2023         /* Disable Interrupts */
2024         Data = 0x00;
2025         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2026
2027         Data = 0x00;
2028         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2029
2030         Data = 0xcf;
2031         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2032
2033         /* Send the updated LCR value to the mos7840 */
2034         Data = mos7840_port->shadowLCR;
2035
2036         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2037
2038         Data = 0x00b;
2039         mos7840_port->shadowMCR = Data;
2040         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2041         Data = 0x00b;
2042         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2043
2044         /* set up the MCR register and send it to the mos7840 */
2045
2046         mos7840_port->shadowMCR = MCR_MASTER_IE;
2047         if (cflag & CBAUD)
2048                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2049
2050         if (cflag & CRTSCTS)
2051                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2052         else
2053                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2054
2055         Data = mos7840_port->shadowMCR;
2056         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2057
2058         /* Determine divisor based on baud rate */
2059         baud = tty_get_baud_rate(tty);
2060
2061         if (!baud) {
2062                 /* pick a default, any default... */
2063                 dbg("%s", "Picked default baud...");
2064                 baud = 9600;
2065         }
2066
2067         dbg("%s - baud rate = %d", __func__, baud);
2068         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2069
2070         /* Enable Interrupts */
2071         Data = 0x0c;
2072         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2073
2074         if (mos7840_port->read_urb_busy == false) {
2075                 mos7840_port->read_urb->dev = serial->dev;
2076                 mos7840_port->read_urb_busy = true;
2077                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2078                 if (status) {
2079                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2080                             status);
2081                         mos7840_port->read_urb_busy = false;
2082                 }
2083         }
2084         wake_up(&mos7840_port->delta_msr_wait);
2085         mos7840_port->delta_msr_cond = 1;
2086         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
2087             mos7840_port->shadowLCR);
2088 }
2089
2090 /*****************************************************************************
2091  * mos7840_set_termios
2092  *      this function is called by the tty driver when it wants to change
2093  *      the termios structure
2094  *****************************************************************************/
2095
2096 static void mos7840_set_termios(struct tty_struct *tty,
2097                                 struct usb_serial_port *port,
2098                                 struct ktermios *old_termios)
2099 {
2100         int status;
2101         unsigned int cflag;
2102         struct usb_serial *serial;
2103         struct moschip_port *mos7840_port;
2104         dbg("mos7840_set_termios: START");
2105         if (mos7840_port_paranoia_check(port, __func__)) {
2106                 dbg("%s", "Invalid port");
2107                 return;
2108         }
2109
2110         serial = port->serial;
2111
2112         if (mos7840_serial_paranoia_check(serial, __func__)) {
2113                 dbg("%s", "Invalid Serial");
2114                 return;
2115         }
2116
2117         mos7840_port = mos7840_get_port_private(port);
2118
2119         if (mos7840_port == NULL)
2120                 return;
2121
2122         if (!mos7840_port->open) {
2123                 dbg("%s - port not opened", __func__);
2124                 return;
2125         }
2126
2127         dbg("%s", "setting termios - ");
2128
2129         cflag = tty->termios->c_cflag;
2130
2131         dbg("%s - clfag %08x iflag %08x", __func__,
2132             tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2133         dbg("%s - old clfag %08x old iflag %08x", __func__,
2134             old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2135         dbg("%s - port %d", __func__, port->number);
2136
2137         /* change the port settings to the new ones specified */
2138
2139         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2140
2141         if (!mos7840_port->read_urb) {
2142                 dbg("%s", "URB KILLED !!!!!");
2143                 return;
2144         }
2145
2146         if (mos7840_port->read_urb_busy == false) {
2147                 mos7840_port->read_urb->dev = serial->dev;
2148                 mos7840_port->read_urb_busy = true;
2149                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2150                 if (status) {
2151                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2152                             status);
2153                         mos7840_port->read_urb_busy = false;
2154                 }
2155         }
2156 }
2157
2158 /*****************************************************************************
2159  * mos7840_get_lsr_info - get line status register info
2160  *
2161  * Purpose: Let user call ioctl() to get info when the UART physically
2162  *          is emptied.  On bus types like RS485, the transmitter must
2163  *          release the bus after transmitting. This must be done when
2164  *          the transmit shift register is empty, not be done when the
2165  *          transmit holding register is empty.  This functionality
2166  *          allows an RS485 driver to be written in user space.
2167  *****************************************************************************/
2168
2169 static int mos7840_get_lsr_info(struct tty_struct *tty,
2170                                 unsigned int __user *value)
2171 {
2172         int count;
2173         unsigned int result = 0;
2174
2175         count = mos7840_chars_in_buffer(tty);
2176         if (count == 0) {
2177                 dbg("%s -- Empty", __func__);
2178                 result = TIOCSER_TEMT;
2179         }
2180
2181         if (copy_to_user(value, &result, sizeof(int)))
2182                 return -EFAULT;
2183         return 0;
2184 }
2185
2186 /*****************************************************************************
2187  * mos7840_get_serial_info
2188  *      function to get information about serial port
2189  *****************************************************************************/
2190
2191 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2192                                    struct serial_struct __user *retinfo)
2193 {
2194         struct serial_struct tmp;
2195
2196         if (mos7840_port == NULL)
2197                 return -1;
2198
2199         if (!retinfo)
2200                 return -EFAULT;
2201
2202         memset(&tmp, 0, sizeof(tmp));
2203
2204         tmp.type = PORT_16550A;
2205         tmp.line = mos7840_port->port->serial->minor;
2206         tmp.port = mos7840_port->port->number;
2207         tmp.irq = 0;
2208         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2209         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2210         tmp.baud_base = 9600;
2211         tmp.close_delay = 5 * HZ;
2212         tmp.closing_wait = 30 * HZ;
2213
2214         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2215                 return -EFAULT;
2216         return 0;
2217 }
2218
2219 static int mos7840_get_icount(struct tty_struct *tty,
2220                         struct serial_icounter_struct *icount)
2221 {
2222         struct usb_serial_port *port = tty->driver_data;
2223         struct moschip_port *mos7840_port;
2224         struct async_icount cnow;
2225
2226         mos7840_port = mos7840_get_port_private(port);
2227         cnow = mos7840_port->icount;
2228
2229         smp_rmb();
2230         icount->cts = cnow.cts;
2231         icount->dsr = cnow.dsr;
2232         icount->rng = cnow.rng;
2233         icount->dcd = cnow.dcd;
2234         icount->rx = cnow.rx;
2235         icount->tx = cnow.tx;
2236         icount->frame = cnow.frame;
2237         icount->overrun = cnow.overrun;
2238         icount->parity = cnow.parity;
2239         icount->brk = cnow.brk;
2240         icount->buf_overrun = cnow.buf_overrun;
2241
2242         dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2243                 port->number, icount->rx, icount->tx);
2244         return 0;
2245 }
2246
2247 /*****************************************************************************
2248  * SerialIoctl
2249  *      this function handles any ioctl calls to the driver
2250  *****************************************************************************/
2251
2252 static int mos7840_ioctl(struct tty_struct *tty,
2253                          unsigned int cmd, unsigned long arg)
2254 {
2255         struct usb_serial_port *port = tty->driver_data;
2256         void __user *argp = (void __user *)arg;
2257         struct moschip_port *mos7840_port;
2258
2259         struct async_icount cnow;
2260         struct async_icount cprev;
2261
2262         if (mos7840_port_paranoia_check(port, __func__)) {
2263                 dbg("%s", "Invalid port");
2264                 return -1;
2265         }
2266
2267         mos7840_port = mos7840_get_port_private(port);
2268
2269         if (mos7840_port == NULL)
2270                 return -1;
2271
2272         dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2273
2274         switch (cmd) {
2275                 /* return number of bytes available */
2276
2277         case TIOCSERGETLSR:
2278                 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2279                 return mos7840_get_lsr_info(tty, argp);
2280
2281         case TIOCGSERIAL:
2282                 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2283                 return mos7840_get_serial_info(mos7840_port, argp);
2284
2285         case TIOCSSERIAL:
2286                 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2287                 break;
2288
2289         case TIOCMIWAIT:
2290                 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2291                 cprev = mos7840_port->icount;
2292                 while (1) {
2293                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2294                         mos7840_port->delta_msr_cond = 0;
2295                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2296                                                  (mos7840_port->
2297                                                   delta_msr_cond == 1));
2298
2299                         /* see if a signal did it */
2300                         if (signal_pending(current))
2301                                 return -ERESTARTSYS;
2302                         cnow = mos7840_port->icount;
2303                         smp_rmb();
2304                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2305                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2306                                 return -EIO;    /* no change => error */
2307                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2308                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2309                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2310                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2311                                 return 0;
2312                         }
2313                         cprev = cnow;
2314                 }
2315                 /* NOTREACHED */
2316                 break;
2317
2318         default:
2319                 break;
2320         }
2321         return -ENOIOCTLCMD;
2322 }
2323
2324 static int mos7840_calc_num_ports(struct usb_serial *serial)
2325 {
2326         __u16 Data = 0x00;
2327         int ret = 0;
2328         int mos7840_num_ports;
2329
2330         ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2331                 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &Data,
2332                 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2333
2334         if ((Data & 0x01) == 0) {
2335                 mos7840_num_ports = 2;
2336                 serial->num_bulk_in = 2;
2337                 serial->num_bulk_out = 2;
2338                 serial->num_ports = 2;
2339         } else {
2340                 mos7840_num_ports = 4;
2341                 serial->num_bulk_in = 4;
2342                 serial->num_bulk_out = 4;
2343                 serial->num_ports = 4;
2344         }
2345
2346         return mos7840_num_ports;
2347 }
2348
2349 /****************************************************************************
2350  * mos7840_startup
2351  ****************************************************************************/
2352
2353 static int mos7840_startup(struct usb_serial *serial)
2354 {
2355         struct moschip_port *mos7840_port;
2356         struct usb_device *dev;
2357         int i, status;
2358
2359         __u16 Data;
2360         dbg("%s", "mos7840_startup :Entering..........");
2361
2362         if (!serial) {
2363                 dbg("%s", "Invalid Handler");
2364                 return -1;
2365         }
2366
2367         dev = serial->dev;
2368
2369         dbg("%s", "Entering...");
2370         dbg ("mos7840_startup: serial = %p", serial);
2371
2372         /* we set up the pointers to the endpoints in the mos7840_open *
2373          * function, as the structures aren't created yet.             */
2374
2375         /* set up port private structures */
2376         for (i = 0; i < serial->num_ports; ++i) {
2377                 dbg ("mos7840_startup: configuring port %d............", i);
2378                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2379                 if (mos7840_port == NULL) {
2380                         dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2381                         status = -ENOMEM;
2382                         i--; /* don't follow NULL pointer cleaning up */
2383                         goto error;
2384                 }
2385
2386                 /* Initialize all port interrupt end point to port 0 int
2387                  * endpoint. Our device has only one interrupt end point
2388                  * common to all port */
2389
2390                 mos7840_port->port = serial->port[i];
2391                 mos7840_set_port_private(serial->port[i], mos7840_port);
2392                 spin_lock_init(&mos7840_port->pool_lock);
2393
2394                 /* minor is not initialised until later by
2395                  * usb-serial.c:get_free_serial() and cannot therefore be used
2396                  * to index device instances */
2397                 mos7840_port->port_num = i + 1;
2398                 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2399                 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2400                 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2401                 dbg ("serial->minor = %d", serial->minor);
2402
2403                 if (mos7840_port->port_num == 1) {
2404                         mos7840_port->SpRegOffset = 0x0;
2405                         mos7840_port->ControlRegOffset = 0x1;
2406                         mos7840_port->DcrRegOffset = 0x4;
2407                 } else if ((mos7840_port->port_num == 2)
2408                            && (serial->num_ports == 4)) {
2409                         mos7840_port->SpRegOffset = 0x8;
2410                         mos7840_port->ControlRegOffset = 0x9;
2411                         mos7840_port->DcrRegOffset = 0x16;
2412                 } else if ((mos7840_port->port_num == 2)
2413                            && (serial->num_ports == 2)) {
2414                         mos7840_port->SpRegOffset = 0xa;
2415                         mos7840_port->ControlRegOffset = 0xb;
2416                         mos7840_port->DcrRegOffset = 0x19;
2417                 } else if ((mos7840_port->port_num == 3)
2418                            && (serial->num_ports == 4)) {
2419                         mos7840_port->SpRegOffset = 0xa;
2420                         mos7840_port->ControlRegOffset = 0xb;
2421                         mos7840_port->DcrRegOffset = 0x19;
2422                 } else if ((mos7840_port->port_num == 4)
2423                            && (serial->num_ports == 4)) {
2424                         mos7840_port->SpRegOffset = 0xc;
2425                         mos7840_port->ControlRegOffset = 0xd;
2426                         mos7840_port->DcrRegOffset = 0x1c;
2427                 }
2428                 mos7840_dump_serial_port(mos7840_port);
2429                 mos7840_set_port_private(serial->port[i], mos7840_port);
2430
2431                 /* enable rx_disable bit in control register */
2432                 status = mos7840_get_reg_sync(serial->port[i],
2433                                  mos7840_port->ControlRegOffset, &Data);
2434                 if (status < 0) {
2435                         dbg("Reading ControlReg failed status-0x%x", status);
2436                         break;
2437                 } else
2438                         dbg("ControlReg Reading success val is %x, status%d",
2439                             Data, status);
2440                 Data |= 0x08;   /* setting driver done bit */
2441                 Data |= 0x04;   /* sp1_bit to have cts change reflect in
2442                                    modem status reg */
2443
2444                 /* Data |= 0x20; //rx_disable bit */
2445                 status = mos7840_set_reg_sync(serial->port[i],
2446                                          mos7840_port->ControlRegOffset, Data);
2447                 if (status < 0) {
2448                         dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
2449                         break;
2450                 } else
2451                         dbg("ControlReg Writing success(rx_disable) status%d",
2452                             status);
2453
2454                 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2455                    and 0x24 in DCR3 */
2456                 Data = 0x01;
2457                 status = mos7840_set_reg_sync(serial->port[i],
2458                          (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2459                 if (status < 0) {
2460                         dbg("Writing DCR0 failed status-0x%x", status);
2461                         break;
2462                 } else
2463                         dbg("DCR0 Writing success status%d", status);
2464
2465                 Data = 0x05;
2466                 status = mos7840_set_reg_sync(serial->port[i],
2467                          (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2468                 if (status < 0) {
2469                         dbg("Writing DCR1 failed status-0x%x", status);
2470                         break;
2471                 } else
2472                         dbg("DCR1 Writing success status%d", status);
2473
2474                 Data = 0x24;
2475                 status = mos7840_set_reg_sync(serial->port[i],
2476                          (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2477                 if (status < 0) {
2478                         dbg("Writing DCR2 failed status-0x%x", status);
2479                         break;
2480                 } else
2481                         dbg("DCR2 Writing success status%d", status);
2482
2483                 /* write values in clkstart0x0 and clkmulti 0x20 */
2484                 Data = 0x0;
2485                 status = mos7840_set_reg_sync(serial->port[i],
2486                                          CLK_START_VALUE_REGISTER, Data);
2487                 if (status < 0) {
2488                         dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
2489                         break;
2490                 } else
2491                         dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
2492
2493                 Data = 0x20;
2494                 status = mos7840_set_reg_sync(serial->port[i],
2495                                         CLK_MULTI_REGISTER, Data);
2496                 if (status < 0) {
2497                         dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
2498                             status);
2499                         goto error;
2500                 } else
2501                         dbg("CLK_MULTI_REGISTER Writing success status%d",
2502                             status);
2503
2504                 /* write value 0x0 to scratchpad register */
2505                 Data = 0x00;
2506                 status = mos7840_set_uart_reg(serial->port[i],
2507                                                 SCRATCH_PAD_REGISTER, Data);
2508                 if (status < 0) {
2509                         dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
2510                             status);
2511                         break;
2512                 } else
2513                         dbg("SCRATCH_PAD_REGISTER Writing success status%d",
2514                             status);
2515
2516                 /* Zero Length flag register */
2517                 if ((mos7840_port->port_num != 1)
2518                     && (serial->num_ports == 2)) {
2519
2520                         Data = 0xff;
2521                         status = mos7840_set_reg_sync(serial->port[i],
2522                                       (__u16) (ZLP_REG1 +
2523                                       ((__u16)mos7840_port->port_num)), Data);
2524                         dbg("ZLIP offset %x",
2525                             (__u16) (ZLP_REG1 +
2526                                         ((__u16) mos7840_port->port_num)));
2527                         if (status < 0) {
2528                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2529                                     i + 2, status);
2530                                 break;
2531                         } else
2532                                 dbg("ZLP_REG%d Writing success status%d",
2533                                     i + 2, status);
2534                 } else {
2535                         Data = 0xff;
2536                         status = mos7840_set_reg_sync(serial->port[i],
2537                               (__u16) (ZLP_REG1 +
2538                               ((__u16)mos7840_port->port_num) - 0x1), Data);
2539                         dbg("ZLIP offset %x",
2540                             (__u16) (ZLP_REG1 +
2541                                      ((__u16) mos7840_port->port_num) - 0x1));
2542                         if (status < 0) {
2543                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2544                                     i + 1, status);
2545                                 break;
2546                         } else
2547                                 dbg("ZLP_REG%d Writing success status%d",
2548                                     i + 1, status);
2549
2550                 }
2551                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2552                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2553                 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2554                                                                 GFP_KERNEL);
2555                 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2556                                                         !mos7840_port->dr) {
2557                         status = -ENOMEM;
2558                         goto error;
2559                 }
2560         }
2561         dbg ("mos7840_startup: all ports configured...........");
2562
2563         /* Zero Length flag enable */
2564         Data = 0x0f;
2565         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2566         if (status < 0) {
2567                 dbg("Writing ZLP_REG5 failed status-0x%x", status);
2568                 goto error;
2569         } else
2570                 dbg("ZLP_REG5 Writing success status%d", status);
2571
2572         /* setting configuration feature to one */
2573         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2574                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2575         return 0;
2576 error:
2577         for (/* nothing */; i >= 0; i--) {
2578                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2579
2580                 kfree(mos7840_port->dr);
2581                 kfree(mos7840_port->ctrl_buf);
2582                 usb_free_urb(mos7840_port->control_urb);
2583                 kfree(mos7840_port);
2584         }
2585         return status;
2586 }
2587
2588 /****************************************************************************
2589  * mos7840_disconnect
2590  *      This function is called whenever the device is removed from the usb bus.
2591  ****************************************************************************/
2592
2593 static void mos7840_disconnect(struct usb_serial *serial)
2594 {
2595         int i;
2596         unsigned long flags;
2597         struct moschip_port *mos7840_port;
2598         dbg("%s", " disconnect :entering..........");
2599
2600         if (!serial) {
2601                 dbg("%s", "Invalid Handler");
2602                 return;
2603         }
2604
2605         /* check for the ports to be closed,close the ports and disconnect */
2606
2607         /* free private structure allocated for serial port  *
2608          * stop reads and writes on all ports                */
2609
2610         for (i = 0; i < serial->num_ports; ++i) {
2611                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2612                 dbg ("mos7840_port %d = %p", i, mos7840_port);
2613                 if (mos7840_port) {
2614                         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2615                         mos7840_port->zombie = 1;
2616                         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2617                         usb_kill_urb(mos7840_port->control_urb);
2618                 }
2619         }
2620
2621         dbg("%s", "Thank u :: ");
2622
2623 }
2624
2625 /****************************************************************************
2626  * mos7840_release
2627  *      This function is called when the usb_serial structure is freed.
2628  ****************************************************************************/
2629
2630 static void mos7840_release(struct usb_serial *serial)
2631 {
2632         int i;
2633         struct moschip_port *mos7840_port;
2634         dbg("%s", " release :entering..........");
2635
2636         if (!serial) {
2637                 dbg("%s", "Invalid Handler");
2638                 return;
2639         }
2640
2641         /* check for the ports to be closed,close the ports and disconnect */
2642
2643         /* free private structure allocated for serial port  *
2644          * stop reads and writes on all ports                */
2645
2646         for (i = 0; i < serial->num_ports; ++i) {
2647                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2648                 dbg("mos7840_port %d = %p", i, mos7840_port);
2649                 if (mos7840_port) {
2650                         usb_free_urb(mos7840_port->control_urb);
2651                         kfree(mos7840_port->ctrl_buf);
2652                         kfree(mos7840_port->dr);
2653                         kfree(mos7840_port);
2654                 }
2655         }
2656
2657         dbg("%s", "Thank u :: ");
2658
2659 }
2660
2661 static struct usb_driver io_driver = {
2662         .name = "mos7840",
2663         .probe = usb_serial_probe,
2664         .disconnect = usb_serial_disconnect,
2665         .id_table = moschip_id_table_combined,
2666         .no_dynamic_id = 1,
2667 };
2668
2669 static struct usb_serial_driver moschip7840_4port_device = {
2670         .driver = {
2671                    .owner = THIS_MODULE,
2672                    .name = "mos7840",
2673                    },
2674         .description = DRIVER_DESC,
2675         .usb_driver = &io_driver,
2676         .id_table = moschip_port_id_table,
2677         .num_ports = 4,
2678         .open = mos7840_open,
2679         .close = mos7840_close,
2680         .write = mos7840_write,
2681         .write_room = mos7840_write_room,
2682         .chars_in_buffer = mos7840_chars_in_buffer,
2683         .throttle = mos7840_throttle,
2684         .unthrottle = mos7840_unthrottle,
2685         .calc_num_ports = mos7840_calc_num_ports,
2686 #ifdef MCSSerialProbe
2687         .probe = mos7840_serial_probe,
2688 #endif
2689         .ioctl = mos7840_ioctl,
2690         .set_termios = mos7840_set_termios,
2691         .break_ctl = mos7840_break,
2692         .tiocmget = mos7840_tiocmget,
2693         .tiocmset = mos7840_tiocmset,
2694         .get_icount = mos7840_get_icount,
2695         .attach = mos7840_startup,
2696         .disconnect = mos7840_disconnect,
2697         .release = mos7840_release,
2698         .read_bulk_callback = mos7840_bulk_in_callback,
2699         .read_int_callback = mos7840_interrupt_callback,
2700 };
2701
2702 /****************************************************************************
2703  * moschip7840_init
2704  *      This is called by the module subsystem, or on startup to initialize us
2705  ****************************************************************************/
2706 static int __init moschip7840_init(void)
2707 {
2708         int retval;
2709
2710         dbg("%s", " mos7840_init :entering..........");
2711
2712         /* Register with the usb serial */
2713         retval = usb_serial_register(&moschip7840_4port_device);
2714
2715         if (retval)
2716                 goto failed_port_device_register;
2717
2718         dbg("%s", "Entering...");
2719         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2720                DRIVER_DESC "\n");
2721
2722         /* Register with the usb */
2723         retval = usb_register(&io_driver);
2724         if (retval == 0) {
2725                 dbg("%s", "Leaving...");
2726                 return 0;
2727         }
2728         usb_serial_deregister(&moschip7840_4port_device);
2729 failed_port_device_register:
2730         return retval;
2731 }
2732
2733 /****************************************************************************
2734  * moschip7840_exit
2735  *      Called when the driver is about to be unloaded.
2736  ****************************************************************************/
2737 static void __exit moschip7840_exit(void)
2738 {
2739
2740         dbg("%s", " mos7840_exit :entering..........");
2741
2742         usb_deregister(&io_driver);
2743
2744         usb_serial_deregister(&moschip7840_4port_device);
2745
2746         dbg("%s", "Entering...");
2747 }
2748
2749 module_init(moschip7840_init);
2750 module_exit(moschip7840_exit);
2751
2752 /* Module information */
2753 MODULE_DESCRIPTION(DRIVER_DESC);
2754 MODULE_LICENSE("GPL");
2755
2756 module_param(debug, bool, S_IRUGO | S_IWUSR);
2757 MODULE_PARM_DESC(debug, "Debug enabled or not");