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 MOS_WDR_TIMEOUT         5000    /* default urb timeout */
  86
  87 #define MOS_PORT1       0x0200
  88 #define MOS_PORT2       0x0300
  89 #define MOS_VENREG      0x0000
  90 #define MOS_MAX_PORT    0x02
  91 #define MOS_WRITE       0x0E
  92 #define MOS_READ        0x0D
  93
  94 /* Requests */
  95 #define MCS_RD_RTYPE    0xC0
  96 #define MCS_WR_RTYPE    0x40
  97 #define MCS_RDREQ       0x0D
  98 #define MCS_WRREQ       0x0E
  99 #define MCS_CTRL_TIMEOUT        500
 100 #define VENDOR_READ_LENGTH      (0x01)
 101
 102 #define MAX_NAME_LEN    64
 103
 104 #define ZLP_REG1  0x3A          /* Zero_Flag_Reg1    58 */
 105 #define ZLP_REG5  0x3E          /* Zero_Flag_Reg5    62 */
 106
 107 /* For higher baud Rates use TIOCEXBAUD */
 108 #define TIOCEXBAUD     0x5462
 109
 110 /* vendor id and device id defines */
 111
 112 /* The native mos7840/7820 component */
 113 #define USB_VENDOR_ID_MOSCHIP           0x9710
 114 #define MOSCHIP_DEVICE_ID_7840          0x7840
 115 #define MOSCHIP_DEVICE_ID_7820          0x7820
 116 #define MOSCHIP_DEVICE_ID_7810          0x7810
 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 id_table.
 120  */
 121 #define USB_VENDOR_ID_BANDB              0x0856
 122 #define BANDB_DEVICE_ID_USO9ML2_2        0xAC22
 123 #define BANDB_DEVICE_ID_USO9ML2_2P       0xBC00
 124 #define BANDB_DEVICE_ID_USO9ML2_4        0xAC24
 125 #define BANDB_DEVICE_ID_USO9ML2_4P       0xBC01
 126 #define BANDB_DEVICE_ID_US9ML2_2         0xAC29
 127 #define BANDB_DEVICE_ID_US9ML2_4         0xAC30
 128 #define BANDB_DEVICE_ID_USPTL4_2         0xAC31
 129 #define BANDB_DEVICE_ID_USPTL4_4         0xAC32
 130 #define BANDB_DEVICE_ID_USOPTL4_2        0xAC42
 131 #define BANDB_DEVICE_ID_USOPTL4_2P       0xBC02
 132 #define BANDB_DEVICE_ID_USOPTL4_4        0xAC44
 133 #define BANDB_DEVICE_ID_USOPTL4_4P       0xBC03
 134 #define BANDB_DEVICE_ID_USOPTL2_4        0xAC24
 135
 136 /* This driver also supports
 137  * ATEN UC2324 device using Moschip MCS7840
 138  * ATEN UC2322 device using Moschip MCS7820
 139  */
 140 #define USB_VENDOR_ID_ATENINTL          0x0557
 141 #define ATENINTL_DEVICE_ID_UC2324       0x2011
 142 #define ATENINTL_DEVICE_ID_UC2322       0x7820
 143
 144 /* Interrupt Routine Defines    */
 145
 146 #define SERIAL_IIR_RLS      0x06
 147 #define SERIAL_IIR_MS       0x00
 148
 149 /*
 150  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 151  */
 152 #define SERIAL_LSR_DR       0x0001
 153 #define SERIAL_LSR_OE       0x0002
 154 #define SERIAL_LSR_PE       0x0004
 155 #define SERIAL_LSR_FE       0x0008
 156 #define SERIAL_LSR_BI       0x0010
 157
 158 #define MOS_MSR_DELTA_CTS   0x10
 159 #define MOS_MSR_DELTA_DSR   0x20
 160 #define MOS_MSR_DELTA_RI    0x40
 161 #define MOS_MSR_DELTA_CD    0x80
 162
 163 /* Serial Port register Address */
 164 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 165 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 166 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 167 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 168 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 169 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 170 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 171 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 172 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 173
 174 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 175 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 176 #define GPIO_REGISTER              ((__u16)(0x07))
 177
 178 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 179
 180 /*
 181  * URB POOL related defines
 182  */
 183 #define NUM_URBS                        16      /* URB Count */
 184 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 185
 186 /* LED on/off milliseconds*/
 187 #define LED_ON_MS       500
 188 #define LED_OFF_MS      500
 189
 190 static int device_type;
 191
 192 static const struct usb_device_id id_table[] = {
 193         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 194         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 195         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
 196         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
 197         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
 198         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 199         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
 200         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 201         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 202         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 203         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 204         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 205         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
 206         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 207         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
 208         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
 209         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 210         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 211         {}                      /* terminating entry */
 212 };
 213 MODULE_DEVICE_TABLE(usb, id_table);
 214
 215 /* This structure holds all of the local port information */
 216
 217 struct moschip_port {
 218         int port_num;           /*Actual port number in the device(1,2,etc) */
 219         struct urb *write_urb;  /* write URB for this port */
 220         struct urb *read_urb;   /* read URB for this port */
 221         __u8 shadowLCR;         /* last LCR value received */
 222         __u8 shadowMCR;         /* last MCR value received */
 223         char open;
 224         char open_ports;
 225         char zombie;
 226         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 227         wait_queue_head_t delta_msr_wait;       /* for handling sleeping while waiting for msr change to happen */
 228         int delta_msr_cond;
 229         struct async_icount icount;
 230         struct usb_serial_port *port;   /* loop back to the owner of this object */
 231
 232         /* Offsets */
 233         __u8 SpRegOffset;
 234         __u8 ControlRegOffset;
 235         __u8 DcrRegOffset;
 236         /* for processing control URBS in interrupt context */
 237         struct urb *control_urb;
 238         struct usb_ctrlrequest *dr;
 239         char *ctrl_buf;
 240         int MsrLsr;
 241
 242         spinlock_t pool_lock;
 243         struct urb *write_urb_pool[NUM_URBS];
 244         char busy[NUM_URBS];
 245         bool read_urb_busy;
 246
 247         /* For device(s) with LED indicator */
 248         bool has_led;
 249         bool led_flag;
 250         struct timer_list led_timer1;   /* Timer for LED on */
 251         struct timer_list led_timer2;   /* Timer for LED off */
 252 };
 253
 254 /*
 255  * mos7840_set_reg_sync
 256  *      To set the Control register by calling usb_fill_control_urb function
 257  *      by passing usb_sndctrlpipe function as parameter.
 258  */
 259
 260 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 261                                 __u16 val)
 262 {
 263         struct usb_device *dev = port->serial->dev;
 264         val = val & 0x00ff;
 265         dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
 266
 267         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 268                                MCS_WR_RTYPE, val, reg, NULL, 0,
 269                                MOS_WDR_TIMEOUT);
 270 }
 271
 272 /*
 273  * mos7840_get_reg_sync
 274  *      To set the Uart register by calling usb_fill_control_urb function by
 275  *      passing usb_rcvctrlpipe function as parameter.
 276  */
 277
 278 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 279                                 __u16 *val)
 280 {
 281         struct usb_device *dev = port->serial->dev;
 282         int ret = 0;
 283         u8 *buf;
 284
 285         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 286         if (!buf)
 287                 return -ENOMEM;
 288
 289         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 290                               MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
 291                               MOS_WDR_TIMEOUT);
 292         *val = buf[0];
 293         dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
 294
 295         kfree(buf);
 296         return ret;
 297 }
 298
 299 /*
 300  * mos7840_set_uart_reg
 301  *      To set the Uart register by calling usb_fill_control_urb function by
 302  *      passing usb_sndctrlpipe function as parameter.
 303  */
 304
 305 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 306                                 __u16 val)
 307 {
 308
 309         struct usb_device *dev = port->serial->dev;
 310         val = val & 0x00ff;
 311         /* For the UART control registers, the application number need
 312            to be Or'ed */
 313         if (port->serial->num_ports == 4) {
 314                 val |= (((__u16) port->number -
 315                                 (__u16) (port->serial->minor)) + 1) << 8;
 316         } else {
 317                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 318                         val |= (((__u16) port->number -
 319                               (__u16) (port->serial->minor)) + 1) << 8;
 320                 } else {
 321                         val |= (((__u16) port->number -
 322                               (__u16) (port->serial->minor)) + 2) << 8;
 323                 }
 324         }
 325         dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
 326         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 327                                MCS_WR_RTYPE, val, reg, NULL, 0,
 328                                MOS_WDR_TIMEOUT);
 329
 330 }
 331
 332 /*
 333  * mos7840_get_uart_reg
 334  *      To set the Control register by calling usb_fill_control_urb function
 335  *      by passing usb_rcvctrlpipe function as parameter.
 336  */
 337 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 338                                 __u16 *val)
 339 {
 340         struct usb_device *dev = port->serial->dev;
 341         int ret = 0;
 342         __u16 Wval;
 343         u8 *buf;
 344
 345         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 346         if (!buf)
 347                 return -ENOMEM;
 348
 349         /* Wval  is same as application number */
 350         if (port->serial->num_ports == 4) {
 351                 Wval =
 352                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 353                      1) << 8;
 354         } else {
 355                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 356                         Wval = (((__u16) port->number -
 357                               (__u16) (port->serial->minor)) + 1) << 8;
 358                 } else {
 359                         Wval = (((__u16) port->number -
 360                               (__u16) (port->serial->minor)) + 2) << 8;
 361                 }
 362         }
 363         dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
 364         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 365                               MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
 366                               MOS_WDR_TIMEOUT);
 367         *val = buf[0];
 368
 369         kfree(buf);
 370         return ret;
 371 }
 372
 373 static void mos7840_dump_serial_port(struct usb_serial_port *port,
 374                                      struct moschip_port *mos7840_port)
 375 {
 376
 377         dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
 378         dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
 379         dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
 380
 381 }
 382
 383 /************************************************************************/
 384 /************************************************************************/
 385 /*             I N T E R F A C E   F U N C T I O N S                    */
 386 /*             I N T E R F A C E   F U N C T I O N S                    */
 387 /************************************************************************/
 388 /************************************************************************/
 389
 390 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 391                                             struct moschip_port *data)
 392 {
 393         usb_set_serial_port_data(port, (void *)data);
 394 }
 395
 396 static inline struct moschip_port *mos7840_get_port_private(struct
 397                                                             usb_serial_port
 398                                                             *port)
 399 {
 400         return (struct moschip_port *)usb_get_serial_port_data(port);
 401 }
 402
 403 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 404 {
 405         struct moschip_port *mos7840_port;
 406         struct async_icount *icount;
 407         mos7840_port = port;
 408         icount = &mos7840_port->icount;
 409         if (new_msr &
 410             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 411              MOS_MSR_DELTA_CD)) {
 412                 icount = &mos7840_port->icount;
 413
 414                 /* update input line counters */
 415                 if (new_msr & MOS_MSR_DELTA_CTS) {
 416                         icount->cts++;
 417                         smp_wmb();
 418                 }
 419                 if (new_msr & MOS_MSR_DELTA_DSR) {
 420                         icount->dsr++;
 421                         smp_wmb();
 422                 }
 423                 if (new_msr & MOS_MSR_DELTA_CD) {
 424                         icount->dcd++;
 425                         smp_wmb();
 426                 }
 427                 if (new_msr & MOS_MSR_DELTA_RI) {
 428                         icount->rng++;
 429                         smp_wmb();
 430                 }
 431         }
 432 }
 433
 434 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 435 {
 436         struct async_icount *icount;
 437
 438         if (new_lsr & SERIAL_LSR_BI) {
 439                 /*
 440                  * Parity and Framing errors only count if they
 441                  * occur exclusive of a break being
 442                  * received.
 443                  */
 444                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 445         }
 446
 447         /* update input line counters */
 448         icount = &port->icount;
 449         if (new_lsr & SERIAL_LSR_BI) {
 450                 icount->brk++;
 451                 smp_wmb();
 452         }
 453         if (new_lsr & SERIAL_LSR_OE) {
 454                 icount->overrun++;
 455                 smp_wmb();
 456         }
 457         if (new_lsr & SERIAL_LSR_PE) {
 458                 icount->parity++;
 459                 smp_wmb();
 460         }
 461         if (new_lsr & SERIAL_LSR_FE) {
 462                 icount->frame++;
 463                 smp_wmb();
 464         }
 465 }
 466
 467 /************************************************************************/
 468 /************************************************************************/
 469 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 470 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 471 /************************************************************************/
 472 /************************************************************************/
 473
 474 static void mos7840_control_callback(struct urb *urb)
 475 {
 476         unsigned char *data;
 477         struct moschip_port *mos7840_port;
 478         struct device *dev = &urb->dev->dev;
 479         __u8 regval = 0x0;
 480         int status = urb->status;
 481
 482         mos7840_port = urb->context;
 483
 484         switch (status) {
 485         case 0:
 486                 /* success */
 487                 break;
 488         case -ECONNRESET:
 489         case -ENOENT:
 490         case -ESHUTDOWN:
 491                 /* this urb is terminated, clean up */
 492                 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
 493                 return;
 494         default:
 495                 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
 496                 return;
 497         }
 498
 499         dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length);
 500         dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__,
 501                 mos7840_port->MsrLsr, mos7840_port->port_num);
 502         data = urb->transfer_buffer;
 503         regval = (__u8) data[0];
 504         dev_dbg(dev, "%s data is %x\n", __func__, regval);
 505         if (mos7840_port->MsrLsr == 0)
 506                 mos7840_handle_new_msr(mos7840_port, regval);
 507         else if (mos7840_port->MsrLsr == 1)
 508                 mos7840_handle_new_lsr(mos7840_port, regval);
 509 }
 510
 511 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 512                            __u16 *val)
 513 {
 514         struct usb_device *dev = mcs->port->serial->dev;
 515         struct usb_ctrlrequest *dr = mcs->dr;
 516         unsigned char *buffer = mcs->ctrl_buf;
 517         int ret;
 518
 519         dr->bRequestType = MCS_RD_RTYPE;
 520         dr->bRequest = MCS_RDREQ;
 521         dr->wValue = cpu_to_le16(Wval); /* 0 */
 522         dr->wIndex = cpu_to_le16(reg);
 523         dr->wLength = cpu_to_le16(2);
 524
 525         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 526                              (unsigned char *)dr, buffer, 2,
 527                              mos7840_control_callback, mcs);
 528         mcs->control_urb->transfer_buffer_length = 2;
 529         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 530         return ret;
 531 }
 532
 533 static void mos7840_set_led_callback(struct urb *urb)
 534 {
 535         switch (urb->status) {
 536         case 0:
 537                 /* Success */
 538                 break;
 539         case -ECONNRESET:
 540         case -ENOENT:
 541         case -ESHUTDOWN:
 542                 /* This urb is terminated, clean up */
 543                 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d",
 544                         __func__, urb->status);
 545                 break;
 546         default:
 547                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d",
 548                         __func__, urb->status);
 549         }
 550 }
 551
 552 static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
 553                                 __u16 reg)
 554 {
 555         struct usb_device *dev = mcs->port->serial->dev;
 556         struct usb_ctrlrequest *dr = mcs->dr;
 557
 558         dr->bRequestType = MCS_WR_RTYPE;
 559         dr->bRequest = MCS_WRREQ;
 560         dr->wValue = cpu_to_le16(wval);
 561         dr->wIndex = cpu_to_le16(reg);
 562         dr->wLength = cpu_to_le16(0);
 563
 564         usb_fill_control_urb(mcs->control_urb, dev, usb_sndctrlpipe(dev, 0),
 565                 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
 566
 567         usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 568 }
 569
 570 static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
 571                                 __u16 val)
 572 {
 573         struct usb_device *dev = port->serial->dev;
 574
 575         usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
 576                         val, reg, NULL, 0, MOS_WDR_TIMEOUT);
 577 }
 578
 579 static void mos7840_led_off(unsigned long arg)
 580 {
 581         struct moschip_port *mcs = (struct moschip_port *) arg;
 582
 583         /* Turn off LED */
 584         mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
 585         mod_timer(&mcs->led_timer2,
 586                                 jiffies + msecs_to_jiffies(LED_OFF_MS));
 587 }
 588
 589 static void mos7840_led_flag_off(unsigned long arg)
 590 {
 591         struct moschip_port *mcs = (struct moschip_port *) arg;
 592
 593         mcs->led_flag = false;
 594 }
 595
 596 /*****************************************************************************
 597  * mos7840_interrupt_callback
 598  *      this is the callback function for when we have received data on the
 599  *      interrupt endpoint.
 600  *****************************************************************************/
 601
 602 static void mos7840_interrupt_callback(struct urb *urb)
 603 {
 604         int result;
 605         int length;
 606         struct moschip_port *mos7840_port;
 607         struct usb_serial *serial;
 608         __u16 Data;
 609         unsigned char *data;
 610         __u8 sp[5], st;
 611         int i, rv = 0;
 612         __u16 wval, wreg = 0;
 613         int status = urb->status;
 614
 615         switch (status) {
 616         case 0:
 617                 /* success */
 618                 break;
 619         case -ECONNRESET:
 620         case -ENOENT:
 621         case -ESHUTDOWN:
 622                 /* this urb is terminated, clean up */
 623                 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
 624                         __func__, status);
 625                 return;
 626         default:
 627                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
 628                         __func__, status);
 629                 goto exit;
 630         }
 631
 632         length = urb->actual_length;
 633         data = urb->transfer_buffer;
 634
 635         serial = urb->context;
 636
 637         /* Moschip get 5 bytes
 638          * Byte 1 IIR Port 1 (port.number is 0)
 639          * Byte 2 IIR Port 2 (port.number is 1)
 640          * Byte 3 IIR Port 3 (port.number is 2)
 641          * Byte 4 IIR Port 4 (port.number is 3)
 642          * Byte 5 FIFO status for both */
 643
 644         if (length && length > 5) {
 645                 dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n");
 646                 return;
 647         }
 648
 649         sp[0] = (__u8) data[0];
 650         sp[1] = (__u8) data[1];
 651         sp[2] = (__u8) data[2];
 652         sp[3] = (__u8) data[3];
 653         st = (__u8) data[4];
 654
 655         for (i = 0; i < serial->num_ports; i++) {
 656                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 657                 wval =
 658                     (((__u16) serial->port[i]->number -
 659                       (__u16) (serial->minor)) + 1) << 8;
 660                 if (mos7840_port->open) {
 661                         if (sp[i] & 0x01) {
 662                                 dev_dbg(&urb->dev->dev, "SP%d No Interrupt !!!\n", i);
 663                         } else {
 664                                 switch (sp[i] & 0x0f) {
 665                                 case SERIAL_IIR_RLS:
 666                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Receiver status error or \n", i);
 667                                         dev_dbg(&urb->dev->dev, "address bit detected in 9-bit mode\n");
 668                                         mos7840_port->MsrLsr = 1;
 669                                         wreg = LINE_STATUS_REGISTER;
 670                                         break;
 671                                 case SERIAL_IIR_MS:
 672                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Modem status change\n", i);
 673                                         mos7840_port->MsrLsr = 0;
 674                                         wreg = MODEM_STATUS_REGISTER;
 675                                         break;
 676                                 }
 677                                 spin_lock(&mos7840_port->pool_lock);
 678                                 if (!mos7840_port->zombie) {
 679                                         rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 680                                 } else {
 681                                         spin_unlock(&mos7840_port->pool_lock);
 682                                         return;
 683                                 }
 684                                 spin_unlock(&mos7840_port->pool_lock);
 685                         }
 686                 }
 687         }
 688         if (!(rv < 0))
 689                 /* the completion handler for the control urb will resubmit */
 690                 return;
 691 exit:
 692         result = usb_submit_urb(urb, GFP_ATOMIC);
 693         if (result) {
 694                 dev_err(&urb->dev->dev,
 695                         "%s - Error %d submitting interrupt urb\n",
 696                         __func__, result);
 697         }
 698 }
 699
 700 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 701                                        const char *function)
 702 {
 703         if (!port) {
 704                 pr_debug("%s - port == NULL\n", function);
 705                 return -1;
 706         }
 707         if (!port->serial) {
 708                 pr_debug("%s - port->serial == NULL\n", function);
 709                 return -1;
 710         }
 711
 712         return 0;
 713 }
 714
 715 /* Inline functions to check the sanity of a pointer that is passed to us */
 716 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 717                                          const char *function)
 718 {
 719         if (!serial) {
 720                 pr_debug("%s - serial == NULL\n", function);
 721                 return -1;
 722         }
 723         if (!serial->type) {
 724                 pr_debug("%s - serial->type == NULL!\n", function);
 725                 return -1;
 726         }
 727
 728         return 0;
 729 }
 730
 731 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 732                                                  const char *function)
 733 {
 734         /* if no port was specified, or it fails a paranoia check */
 735         if (!port ||
 736             mos7840_port_paranoia_check(port, function) ||
 737             mos7840_serial_paranoia_check(port->serial, function)) {
 738                 /* then say that we don't have a valid usb_serial thing,
 739                  * which will end up genrating -ENODEV return values */
 740                 return NULL;
 741         }
 742
 743         return port->serial;
 744 }
 745
 746 /*****************************************************************************
 747  * mos7840_bulk_in_callback
 748  *      this is the callback function for when we have received data on the
 749  *      bulk in endpoint.
 750  *****************************************************************************/
 751
 752 static void mos7840_bulk_in_callback(struct urb *urb)
 753 {
 754         int retval;
 755         unsigned char *data;
 756         struct usb_serial *serial;
 757         struct usb_serial_port *port;
 758         struct moschip_port *mos7840_port;
 759         struct tty_struct *tty;
 760         int status = urb->status;
 761
 762         mos7840_port = urb->context;
 763         if (!mos7840_port)
 764                 return;
 765
 766         if (status) {
 767                 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
 768                 mos7840_port->read_urb_busy = false;
 769                 return;
 770         }
 771
 772         port = mos7840_port->port;
 773         if (mos7840_port_paranoia_check(port, __func__)) {
 774                 mos7840_port->read_urb_busy = false;
 775                 return;
 776         }
 777
 778         serial = mos7840_get_usb_serial(port, __func__);
 779         if (!serial) {
 780                 mos7840_port->read_urb_busy = false;
 781                 return;
 782         }
 783
 784         data = urb->transfer_buffer;
 785         usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
 786
 787         if (urb->actual_length) {
 788                 tty = tty_port_tty_get(&mos7840_port->port->port);
 789                 if (tty) {
 790                         tty_insert_flip_string(tty, data, urb->actual_length);
 791                         tty_flip_buffer_push(tty);
 792                         tty_kref_put(tty);
 793                 }
 794                 mos7840_port->icount.rx += urb->actual_length;
 795                 smp_wmb();
 796                 dev_dbg(&port->dev, "mos7840_port->icount.rx is %d:\n", mos7840_port->icount.rx);
 797         }
 798
 799         if (!mos7840_port->read_urb) {
 800                 dev_dbg(&port->dev, "%s", "URB KILLED !!!\n");
 801                 mos7840_port->read_urb_busy = false;
 802                 return;
 803         }
 804
 805         /* Turn on LED */
 806         if (mos7840_port->has_led && !mos7840_port->led_flag) {
 807                 mos7840_port->led_flag = true;
 808                 mos7840_set_led_async(mos7840_port, 0x0301,
 809                                         MODEM_CONTROL_REGISTER);
 810                 mod_timer(&mos7840_port->led_timer1,
 811                                 jiffies + msecs_to_jiffies(LED_ON_MS));
 812         }
 813
 814         mos7840_port->read_urb_busy = true;
 815         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 816
 817         if (retval) {
 818                 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
 819                 mos7840_port->read_urb_busy = false;
 820         }
 821 }
 822
 823 /*****************************************************************************
 824  * mos7840_bulk_out_data_callback
 825  *      this is the callback function for when we have finished sending
 826  *      serial data on the bulk out endpoint.
 827  *****************************************************************************/
 828
 829 static void mos7840_bulk_out_data_callback(struct urb *urb)
 830 {
 831         struct moschip_port *mos7840_port;
 832         struct usb_serial_port *port;
 833         struct tty_struct *tty;
 834         int status = urb->status;
 835         int i;
 836
 837         mos7840_port = urb->context;
 838         port = mos7840_port->port;
 839         spin_lock(&mos7840_port->pool_lock);
 840         for (i = 0; i < NUM_URBS; i++) {
 841                 if (urb == mos7840_port->write_urb_pool[i]) {
 842                         mos7840_port->busy[i] = 0;
 843                         break;
 844                 }
 845         }
 846         spin_unlock(&mos7840_port->pool_lock);
 847
 848         if (status) {
 849                 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
 850                 return;
 851         }
 852
 853         if (mos7840_port_paranoia_check(port, __func__))
 854                 return;
 855
 856         tty = tty_port_tty_get(&port->port);
 857         if (tty && mos7840_port->open)
 858                 tty_wakeup(tty);
 859         tty_kref_put(tty);
 860
 861 }
 862
 863 /************************************************************************/
 864 /*       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       */
 865 /************************************************************************/
 866 #ifdef MCSSerialProbe
 867 static int mos7840_serial_probe(struct usb_serial *serial,
 868                                 const struct usb_device_id *id)
 869 {
 870
 871         /*need to implement the mode_reg reading and updating\
 872            structures usb_serial_ device_type\
 873            (i.e num_ports, num_bulkin,bulkout etc) */
 874         /* Also we can update the changes  attach */
 875         return 1;
 876 }
 877 #endif
 878
 879 /*****************************************************************************
 880  * mos7840_open
 881  *      this function is called by the tty driver when a port is opened
 882  *      If successful, we return 0
 883  *      Otherwise we return a negative error number.
 884  *****************************************************************************/
 885
 886 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
 887 {
 888         int response;
 889         int j;
 890         struct usb_serial *serial;
 891         struct urb *urb;
 892         __u16 Data;
 893         int status;
 894         struct moschip_port *mos7840_port;
 895         struct moschip_port *port0;
 896
 897         if (mos7840_port_paranoia_check(port, __func__))
 898                 return -ENODEV;
 899
 900         serial = port->serial;
 901
 902         if (mos7840_serial_paranoia_check(serial, __func__))
 903                 return -ENODEV;
 904
 905         mos7840_port = mos7840_get_port_private(port);
 906         port0 = mos7840_get_port_private(serial->port[0]);
 907
 908         if (mos7840_port == NULL || port0 == NULL)
 909                 return -ENODEV;
 910
 911         usb_clear_halt(serial->dev, port->write_urb->pipe);
 912         usb_clear_halt(serial->dev, port->read_urb->pipe);
 913         port0->open_ports++;
 914
 915         /* Initialising the write urb pool */
 916         for (j = 0; j < NUM_URBS; ++j) {
 917                 urb = usb_alloc_urb(0, GFP_KERNEL);
 918                 mos7840_port->write_urb_pool[j] = urb;
 919
 920                 if (urb == NULL) {
 921                         dev_err(&port->dev, "No more urbs???\n");
 922                         continue;
 923                 }
 924
 925                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 926                                                                 GFP_KERNEL);
 927                 if (!urb->transfer_buffer) {
 928                         usb_free_urb(urb);
 929                         mos7840_port->write_urb_pool[j] = NULL;
 930                         dev_err(&port->dev,
 931                                 "%s-out of memory for urb buffers.\n",
 932                                 __func__);
 933                         continue;
 934                 }
 935         }
 936
 937 /*****************************************************************************
 938  * Initialize MCS7840 -- Write Init values to corresponding Registers
 939  *
 940  * Register Index
 941  * 1 : IER
 942  * 2 : FCR
 943  * 3 : LCR
 944  * 4 : MCR
 945  *
 946  * 0x08 : SP1/2 Control Reg
 947  *****************************************************************************/
 948
 949         /* NEED to check the following Block */
 950
 951         Data = 0x0;
 952         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 953         if (status < 0) {
 954                 dev_dbg(&port->dev, "Reading Spreg failed\n");
 955                 return -1;
 956         }
 957         Data |= 0x80;
 958         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 959         if (status < 0) {
 960                 dev_dbg(&port->dev, "writing Spreg failed\n");
 961                 return -1;
 962         }
 963
 964         Data &= ~0x80;
 965         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 966         if (status < 0) {
 967                 dev_dbg(&port->dev, "writing Spreg failed\n");
 968                 return -1;
 969         }
 970         /* End of block to be checked */
 971
 972         Data = 0x0;
 973         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 974                                                                         &Data);
 975         if (status < 0) {
 976                 dev_dbg(&port->dev, "Reading Controlreg failed\n");
 977                 return -1;
 978         }
 979         Data |= 0x08;           /* Driver done bit */
 980         Data |= 0x20;           /* rx_disable */
 981         status = mos7840_set_reg_sync(port,
 982                                 mos7840_port->ControlRegOffset, Data);
 983         if (status < 0) {
 984                 dev_dbg(&port->dev, "writing Controlreg failed\n");
 985                 return -1;
 986         }
 987         /* do register settings here */
 988         /* Set all regs to the device default values. */
 989         /***********************************
 990          * First Disable all interrupts.
 991          ***********************************/
 992         Data = 0x00;
 993         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 994         if (status < 0) {
 995                 dev_dbg(&port->dev, "disabling interrupts failed\n");
 996                 return -1;
 997         }
 998         /* Set FIFO_CONTROL_REGISTER to the default value */
 999         Data = 0x00;
1000         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1001         if (status < 0) {
1002                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
1003                 return -1;
1004         }
1005
1006         Data = 0xcf;
1007         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1008         if (status < 0) {
1009                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
1010                 return -1;
1011         }
1012
1013         Data = 0x03;
1014         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1015         mos7840_port->shadowLCR = Data;
1016
1017         Data = 0x0b;
1018         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1019         mos7840_port->shadowMCR = Data;
1020
1021         Data = 0x00;
1022         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1023         mos7840_port->shadowLCR = Data;
1024
1025         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1026         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1027
1028         Data = 0x0c;
1029         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1030
1031         Data = 0x0;
1032         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1033
1034         Data = 0x00;
1035         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1036
1037         Data = Data & ~SERIAL_LCR_DLAB;
1038         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1039         mos7840_port->shadowLCR = Data;
1040
1041         /* clearing Bulkin and Bulkout Fifo */
1042         Data = 0x0;
1043         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1044
1045         Data = Data | 0x0c;
1046         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1047
1048         Data = Data & ~0x0c;
1049         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1050         /* Finally enable all interrupts */
1051         Data = 0x0c;
1052         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1053
1054         /* clearing rx_disable */
1055         Data = 0x0;
1056         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1057                                                                         &Data);
1058         Data = Data & ~0x20;
1059         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1060                                                                         Data);
1061
1062         /* rx_negate */
1063         Data = 0x0;
1064         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1065                                                                         &Data);
1066         Data = Data | 0x10;
1067         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1068                                                                         Data);
1069
1070         /* Check to see if we've set up our endpoint info yet    *
1071          * (can't set it up in mos7840_startup as the structures *
1072          * were not set up at that time.)                        */
1073         if (port0->open_ports == 1) {
1074                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1075                         /* set up interrupt urb */
1076                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1077                                 serial->dev,
1078                                 usb_rcvintpipe(serial->dev,
1079                                 serial->port[0]->interrupt_in_endpointAddress),
1080                                 serial->port[0]->interrupt_in_buffer,
1081                                 serial->port[0]->interrupt_in_urb->
1082                                 transfer_buffer_length,
1083                                 mos7840_interrupt_callback,
1084                                 serial,
1085                                 serial->port[0]->interrupt_in_urb->interval);
1086
1087                         /* start interrupt read for mos7840               *
1088                          * will continue as long as mos7840 is connected  */
1089
1090                         response =
1091                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1092                                            GFP_KERNEL);
1093                         if (response) {
1094                                 dev_err(&port->dev, "%s - Error %d submitting "
1095                                         "interrupt urb\n", __func__, response);
1096                         }
1097
1098                 }
1099
1100         }
1101
1102         /* see if we've set up our endpoint info yet   *
1103          * (can't set it up in mos7840_startup as the  *
1104          * structures were not set up at that time.)   */
1105
1106         dev_dbg(&port->dev, "port number is %d\n", port->number);
1107         dev_dbg(&port->dev, "serial number is %d\n", port->serial->minor);
1108         dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
1109         dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
1110         dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
1111         dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
1112         mos7840_port->read_urb = port->read_urb;
1113
1114         /* set up our bulk in urb */
1115         if ((serial->num_ports == 2)
1116                 && ((((__u16)port->number -
1117                         (__u16)(port->serial->minor)) % 2) != 0)) {
1118                 usb_fill_bulk_urb(mos7840_port->read_urb,
1119                         serial->dev,
1120                         usb_rcvbulkpipe(serial->dev,
1121                                 (port->bulk_in_endpointAddress) + 2),
1122                         port->bulk_in_buffer,
1123                         mos7840_port->read_urb->transfer_buffer_length,
1124                         mos7840_bulk_in_callback, mos7840_port);
1125         } else {
1126                 usb_fill_bulk_urb(mos7840_port->read_urb,
1127                         serial->dev,
1128                         usb_rcvbulkpipe(serial->dev,
1129                                 port->bulk_in_endpointAddress),
1130                         port->bulk_in_buffer,
1131                         mos7840_port->read_urb->transfer_buffer_length,
1132                         mos7840_bulk_in_callback, mos7840_port);
1133         }
1134
1135         dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
1136         mos7840_port->read_urb_busy = true;
1137         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1138         if (response) {
1139                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1140                         __func__, response);
1141                 mos7840_port->read_urb_busy = false;
1142         }
1143
1144         /* initialize our wait queues */
1145         init_waitqueue_head(&mos7840_port->wait_chase);
1146         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1147
1148         /* initialize our icount structure */
1149         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1150
1151         /* initialize our port settings */
1152         /* Must set to enable ints! */
1153         mos7840_port->shadowMCR = MCR_MASTER_IE;
1154         /* send a open port command */
1155         mos7840_port->open = 1;
1156         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1157         mos7840_port->icount.tx = 0;
1158         mos7840_port->icount.rx = 0;
1159
1160         return 0;
1161 }
1162
1163 /*****************************************************************************
1164  * mos7840_chars_in_buffer
1165  *      this function is called by the tty driver when it wants to know how many
1166  *      bytes of data we currently have outstanding in the port (data that has
1167  *      been written, but hasn't made it out the port yet)
1168  *      If successful, we return the number of bytes left to be written in the
1169  *      system,
1170  *      Otherwise we return zero.
1171  *****************************************************************************/
1172
1173 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1174 {
1175         struct usb_serial_port *port = tty->driver_data;
1176         int i;
1177         int chars = 0;
1178         unsigned long flags;
1179         struct moschip_port *mos7840_port;
1180
1181         if (mos7840_port_paranoia_check(port, __func__))
1182                 return 0;
1183
1184         mos7840_port = mos7840_get_port_private(port);
1185         if (mos7840_port == NULL)
1186                 return 0;
1187
1188         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1189         for (i = 0; i < NUM_URBS; ++i) {
1190                 if (mos7840_port->busy[i]) {
1191                         struct urb *urb = mos7840_port->write_urb_pool[i];
1192                         chars += urb->transfer_buffer_length;
1193                 }
1194         }
1195         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1196         dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1197         return chars;
1198
1199 }
1200
1201 /*****************************************************************************
1202  * mos7840_close
1203  *      this function is called by the tty driver when a port is closed
1204  *****************************************************************************/
1205
1206 static void mos7840_close(struct usb_serial_port *port)
1207 {
1208         struct usb_serial *serial;
1209         struct moschip_port *mos7840_port;
1210         struct moschip_port *port0;
1211         int j;
1212         __u16 Data;
1213
1214         if (mos7840_port_paranoia_check(port, __func__))
1215                 return;
1216
1217         serial = mos7840_get_usb_serial(port, __func__);
1218         if (!serial)
1219                 return;
1220
1221         mos7840_port = mos7840_get_port_private(port);
1222         port0 = mos7840_get_port_private(serial->port[0]);
1223
1224         if (mos7840_port == NULL || port0 == NULL)
1225                 return;
1226
1227         for (j = 0; j < NUM_URBS; ++j)
1228                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1229
1230         /* Freeing Write URBs */
1231         for (j = 0; j < NUM_URBS; ++j) {
1232                 if (mos7840_port->write_urb_pool[j]) {
1233                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1234                                 kfree(mos7840_port->write_urb_pool[j]->
1235                                       transfer_buffer);
1236
1237                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1238                 }
1239         }
1240
1241         /* While closing port, shutdown all bulk read, write  *
1242          * and interrupt read if they exists                  */
1243         if (serial->dev) {
1244                 if (mos7840_port->write_urb) {
1245                         dev_dbg(&port->dev, "%s", "Shutdown bulk write\n");
1246                         usb_kill_urb(mos7840_port->write_urb);
1247                 }
1248                 if (mos7840_port->read_urb) {
1249                         dev_dbg(&port->dev, "%s", "Shutdown bulk read\n");
1250                         usb_kill_urb(mos7840_port->read_urb);
1251                         mos7840_port->read_urb_busy = false;
1252                 }
1253                 if ((&mos7840_port->control_urb)) {
1254                         dev_dbg(&port->dev, "%s", "Shutdown control read\n");
1255                         /*/      usb_kill_urb (mos7840_port->control_urb); */
1256                 }
1257         }
1258 /*      if(mos7840_port->ctrl_buf != NULL) */
1259 /*              kfree(mos7840_port->ctrl_buf); */
1260         port0->open_ports--;
1261         dev_dbg(&port->dev, "%s in close%d:in port%d\n", __func__, port0->open_ports, port->number);
1262         if (port0->open_ports == 0) {
1263                 if (serial->port[0]->interrupt_in_urb) {
1264                         dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n");
1265                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1266                 }
1267         }
1268
1269         if (mos7840_port->write_urb) {
1270                 /* if this urb had a transfer buffer already (old tx) free it */
1271                 if (mos7840_port->write_urb->transfer_buffer != NULL)
1272                         kfree(mos7840_port->write_urb->transfer_buffer);
1273                 usb_free_urb(mos7840_port->write_urb);
1274         }
1275
1276         Data = 0x0;
1277         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1278
1279         Data = 0x00;
1280         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1281
1282         mos7840_port->open = 0;
1283 }
1284
1285 /************************************************************************
1286  *
1287  * mos7840_block_until_chase_response
1288  *
1289  *      This function will block the close until one of the following:
1290  *              1. Response to our Chase comes from mos7840
1291  *              2. A timeout of 10 seconds without activity has expired
1292  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1293  *
1294  ************************************************************************/
1295
1296 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1297                                         struct moschip_port *mos7840_port)
1298 {
1299         int timeout = msecs_to_jiffies(1000);
1300         int wait = 10;
1301         int count;
1302
1303         while (1) {
1304                 count = mos7840_chars_in_buffer(tty);
1305
1306                 /* Check for Buffer status */
1307                 if (count <= 0)
1308                         return;
1309
1310                 /* Block the thread for a while */
1311                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1312                                                timeout);
1313                 /* No activity.. count down section */
1314                 wait--;
1315                 if (wait == 0) {
1316                         dev_dbg(&mos7840_port->port->dev, "%s - TIMEOUT\n", __func__);
1317                         return;
1318                 } else {
1319                         /* Reset timeout value back to seconds */
1320                         wait = 10;
1321                 }
1322         }
1323
1324 }
1325
1326 /*****************************************************************************
1327  * mos7840_break
1328  *      this function sends a break to the port
1329  *****************************************************************************/
1330 static void mos7840_break(struct tty_struct *tty, int break_state)
1331 {
1332         struct usb_serial_port *port = tty->driver_data;
1333         unsigned char data;
1334         struct usb_serial *serial;
1335         struct moschip_port *mos7840_port;
1336
1337         if (mos7840_port_paranoia_check(port, __func__))
1338                 return;
1339
1340         serial = mos7840_get_usb_serial(port, __func__);
1341         if (!serial)
1342                 return;
1343
1344         mos7840_port = mos7840_get_port_private(port);
1345
1346         if (mos7840_port == NULL)
1347                 return;
1348
1349         if (serial->dev)
1350                 /* flush and block until tx is empty */
1351                 mos7840_block_until_chase_response(tty, mos7840_port);
1352
1353         if (break_state == -1)
1354                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1355         else
1356                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1357
1358         /* FIXME: no locking on shadowLCR anywhere in driver */
1359         mos7840_port->shadowLCR = data;
1360         dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1361         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1362                              mos7840_port->shadowLCR);
1363 }
1364
1365 /*****************************************************************************
1366  * mos7840_write_room
1367  *      this function is called by the tty driver when it wants to know how many
1368  *      bytes of data we can accept for a specific port.
1369  *      If successful, we return the amount of room that we have for this port
1370  *      Otherwise we return a negative error number.
1371  *****************************************************************************/
1372
1373 static int mos7840_write_room(struct tty_struct *tty)
1374 {
1375         struct usb_serial_port *port = tty->driver_data;
1376         int i;
1377         int room = 0;
1378         unsigned long flags;
1379         struct moschip_port *mos7840_port;
1380
1381         if (mos7840_port_paranoia_check(port, __func__))
1382                 return -1;
1383
1384         mos7840_port = mos7840_get_port_private(port);
1385         if (mos7840_port == NULL)
1386                 return -1;
1387
1388         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1389         for (i = 0; i < NUM_URBS; ++i) {
1390                 if (!mos7840_port->busy[i])
1391                         room += URB_TRANSFER_BUFFER_SIZE;
1392         }
1393         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1394
1395         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1396         dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room);
1397         return room;
1398
1399 }
1400
1401 /*****************************************************************************
1402  * mos7840_write
1403  *      this function is called by the tty driver when data should be written to
1404  *      the port.
1405  *      If successful, we return the number of bytes written, otherwise we
1406  *      return a negative error number.
1407  *****************************************************************************/
1408
1409 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1410                          const unsigned char *data, int count)
1411 {
1412         int status;
1413         int i;
1414         int bytes_sent = 0;
1415         int transfer_size;
1416         unsigned long flags;
1417
1418         struct moschip_port *mos7840_port;
1419         struct usb_serial *serial;
1420         struct urb *urb;
1421         /* __u16 Data; */
1422         const unsigned char *current_position = data;
1423         unsigned char *data1;
1424
1425 #ifdef NOTMOS7840
1426         Data = 0x00;
1427         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1428         mos7840_port->shadowLCR = Data;
1429         dev_dbg(&port->dev, "%s: LINE_CONTROL_REGISTER is %x\n", __func__, Data);
1430         dev_dbg(&port->dev, "%s: mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1431
1432         /* Data = 0x03; */
1433         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1434         /* mos7840_port->shadowLCR=Data;//Need to add later */
1435
1436         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1437         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1438
1439         /* Data = 0x0c; */
1440         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1441         Data = 0x00;
1442         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1443         dev_dbg(&port->dev, "%s: DLL value is %x\n", __func__, Data);
1444
1445         Data = 0x0;
1446         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1447         dev_dbg(&port->dev, "%s: DLM value is %x\n", __func__, Data);
1448
1449         Data = Data & ~SERIAL_LCR_DLAB;
1450         dev_dbg(&port->dev, "%s: mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1451         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1452 #endif
1453
1454         if (mos7840_port_paranoia_check(port, __func__))
1455                 return -1;
1456
1457         serial = port->serial;
1458         if (mos7840_serial_paranoia_check(serial, __func__))
1459                 return -1;
1460
1461         mos7840_port = mos7840_get_port_private(port);
1462         if (mos7840_port == NULL)
1463                 return -1;
1464
1465         /* try to find a free urb in the list */
1466         urb = NULL;
1467
1468         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1469         for (i = 0; i < NUM_URBS; ++i) {
1470                 if (!mos7840_port->busy[i]) {
1471                         mos7840_port->busy[i] = 1;
1472                         urb = mos7840_port->write_urb_pool[i];
1473                         dev_dbg(&port->dev, "URB:%d\n", i);
1474                         break;
1475                 }
1476         }
1477         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1478
1479         if (urb == NULL) {
1480                 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1481                 goto exit;
1482         }
1483
1484         if (urb->transfer_buffer == NULL) {
1485                 urb->transfer_buffer =
1486                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1487
1488                 if (urb->transfer_buffer == NULL) {
1489                         dev_err_console(port, "%s no more kernel memory...\n",
1490                                 __func__);
1491                         goto exit;
1492                 }
1493         }
1494         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1495
1496         memcpy(urb->transfer_buffer, current_position, transfer_size);
1497
1498         /* fill urb with data and submit  */
1499         if ((serial->num_ports == 2)
1500                 && ((((__u16)port->number -
1501                         (__u16)(port->serial->minor)) % 2) != 0)) {
1502                 usb_fill_bulk_urb(urb,
1503                         serial->dev,
1504                         usb_sndbulkpipe(serial->dev,
1505                                 (port->bulk_out_endpointAddress) + 2),
1506                         urb->transfer_buffer,
1507                         transfer_size,
1508                         mos7840_bulk_out_data_callback, mos7840_port);
1509         } else {
1510                 usb_fill_bulk_urb(urb,
1511                         serial->dev,
1512                         usb_sndbulkpipe(serial->dev,
1513                                 port->bulk_out_endpointAddress),
1514                         urb->transfer_buffer,
1515                         transfer_size,
1516                         mos7840_bulk_out_data_callback, mos7840_port);
1517         }
1518
1519         data1 = urb->transfer_buffer;
1520         dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
1521
1522         /* Turn on LED */
1523         if (mos7840_port->has_led && !mos7840_port->led_flag) {
1524                 mos7840_port->led_flag = true;
1525                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0301);
1526                 mod_timer(&mos7840_port->led_timer1,
1527                                 jiffies + msecs_to_jiffies(LED_ON_MS));
1528         }
1529
1530         /* send it down the pipe */
1531         status = usb_submit_urb(urb, GFP_ATOMIC);
1532
1533         if (status) {
1534                 mos7840_port->busy[i] = 0;
1535                 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1536                         "with status = %d\n", __func__, status);
1537                 bytes_sent = status;
1538                 goto exit;
1539         }
1540         bytes_sent = transfer_size;
1541         mos7840_port->icount.tx += transfer_size;
1542         smp_wmb();
1543         dev_dbg(&port->dev, "mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx);
1544 exit:
1545         return bytes_sent;
1546
1547 }
1548
1549 /*****************************************************************************
1550  * mos7840_throttle
1551  *      this function is called by the tty driver when it wants to stop the data
1552  *      being read from the port.
1553  *****************************************************************************/
1554
1555 static void mos7840_throttle(struct tty_struct *tty)
1556 {
1557         struct usb_serial_port *port = tty->driver_data;
1558         struct moschip_port *mos7840_port;
1559         int status;
1560
1561         if (mos7840_port_paranoia_check(port, __func__))
1562                 return;
1563
1564         mos7840_port = mos7840_get_port_private(port);
1565
1566         if (mos7840_port == NULL)
1567                 return;
1568
1569         if (!mos7840_port->open) {
1570                 dev_dbg(&port->dev, "%s", "port not opened\n");
1571                 return;
1572         }
1573
1574         /* if we are implementing XON/XOFF, send the stop character */
1575         if (I_IXOFF(tty)) {
1576                 unsigned char stop_char = STOP_CHAR(tty);
1577                 status = mos7840_write(tty, port, &stop_char, 1);
1578                 if (status <= 0)
1579                         return;
1580         }
1581         /* if we are implementing RTS/CTS, toggle that line */
1582         if (tty->termios.c_cflag & CRTSCTS) {
1583                 mos7840_port->shadowMCR &= ~MCR_RTS;
1584                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1585                                          mos7840_port->shadowMCR);
1586                 if (status < 0)
1587                         return;
1588         }
1589 }
1590
1591 /*****************************************************************************
1592  * mos7840_unthrottle
1593  *      this function is called by the tty driver when it wants to resume
1594  *      the data being read from the port (called after mos7840_throttle is
1595  *      called)
1596  *****************************************************************************/
1597 static void mos7840_unthrottle(struct tty_struct *tty)
1598 {
1599         struct usb_serial_port *port = tty->driver_data;
1600         int status;
1601         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1602
1603         if (mos7840_port_paranoia_check(port, __func__))
1604                 return;
1605
1606         if (mos7840_port == NULL)
1607                 return;
1608
1609         if (!mos7840_port->open) {
1610                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1611                 return;
1612         }
1613
1614         /* if we are implementing XON/XOFF, send the start character */
1615         if (I_IXOFF(tty)) {
1616                 unsigned char start_char = START_CHAR(tty);
1617                 status = mos7840_write(tty, port, &start_char, 1);
1618                 if (status <= 0)
1619                         return;
1620         }
1621
1622         /* if we are implementing RTS/CTS, toggle that line */
1623         if (tty->termios.c_cflag & CRTSCTS) {
1624                 mos7840_port->shadowMCR |= MCR_RTS;
1625                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1626                                          mos7840_port->shadowMCR);
1627                 if (status < 0)
1628                         return;
1629         }
1630 }
1631
1632 static int mos7840_tiocmget(struct tty_struct *tty)
1633 {
1634         struct usb_serial_port *port = tty->driver_data;
1635         struct moschip_port *mos7840_port;
1636         unsigned int result;
1637         __u16 msr;
1638         __u16 mcr;
1639         int status;
1640         mos7840_port = mos7840_get_port_private(port);
1641
1642         if (mos7840_port == NULL)
1643                 return -ENODEV;
1644
1645         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1646         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1647         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1648             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1649             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1650             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1651             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1652             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1653             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1654
1655         dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1656
1657         return result;
1658 }
1659
1660 static int mos7840_tiocmset(struct tty_struct *tty,
1661                             unsigned int set, unsigned int clear)
1662 {
1663         struct usb_serial_port *port = tty->driver_data;
1664         struct moschip_port *mos7840_port;
1665         unsigned int mcr;
1666         int status;
1667
1668         mos7840_port = mos7840_get_port_private(port);
1669
1670         if (mos7840_port == NULL)
1671                 return -ENODEV;
1672
1673         /* FIXME: What locks the port registers ? */
1674         mcr = mos7840_port->shadowMCR;
1675         if (clear & TIOCM_RTS)
1676                 mcr &= ~MCR_RTS;
1677         if (clear & TIOCM_DTR)
1678                 mcr &= ~MCR_DTR;
1679         if (clear & TIOCM_LOOP)
1680                 mcr &= ~MCR_LOOPBACK;
1681
1682         if (set & TIOCM_RTS)
1683                 mcr |= MCR_RTS;
1684         if (set & TIOCM_DTR)
1685                 mcr |= MCR_DTR;
1686         if (set & TIOCM_LOOP)
1687                 mcr |= MCR_LOOPBACK;
1688
1689         mos7840_port->shadowMCR = mcr;
1690
1691         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1692         if (status < 0) {
1693                 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1694                 return status;
1695         }
1696
1697         return 0;
1698 }
1699
1700 /*****************************************************************************
1701  * mos7840_calc_baud_rate_divisor
1702  *      this function calculates the proper baud rate divisor for the specified
1703  *      baud rate.
1704  *****************************************************************************/
1705 static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1706                                           int baudRate, int *divisor,
1707                                           __u16 *clk_sel_val)
1708 {
1709         dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1710
1711         if (baudRate <= 115200) {
1712                 *divisor = 115200 / baudRate;
1713                 *clk_sel_val = 0x0;
1714         }
1715         if ((baudRate > 115200) && (baudRate <= 230400)) {
1716                 *divisor = 230400 / baudRate;
1717                 *clk_sel_val = 0x10;
1718         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1719                 *divisor = 403200 / baudRate;
1720                 *clk_sel_val = 0x20;
1721         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1722                 *divisor = 460800 / baudRate;
1723                 *clk_sel_val = 0x30;
1724         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1725                 *divisor = 806400 / baudRate;
1726                 *clk_sel_val = 0x40;
1727         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1728                 *divisor = 921600 / baudRate;
1729                 *clk_sel_val = 0x50;
1730         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1731                 *divisor = 1572864 / baudRate;
1732                 *clk_sel_val = 0x60;
1733         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1734                 *divisor = 3145728 / baudRate;
1735                 *clk_sel_val = 0x70;
1736         }
1737         return 0;
1738
1739 #ifdef NOTMCS7840
1740
1741         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1742                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1743                         *divisor = mos7840_divisor_table[i].Divisor;
1744                         return 0;
1745                 }
1746         }
1747
1748         /* After trying for all the standard baud rates    *
1749          * Try calculating the divisor for this baud rate  */
1750
1751         if (baudrate > 75 && baudrate < 230400) {
1752                 /* get the divisor */
1753                 custom = (__u16) (230400L / baudrate);
1754
1755                 /* Check for round off */
1756                 round1 = (__u16) (2304000L / baudrate);
1757                 round = (__u16) (round1 - (custom * 10));
1758                 if (round > 4)
1759                         custom++;
1760                 *divisor = custom;
1761
1762                 dev_dbg(&port->dev, " Baud %d = %d\n", baudrate, custom);
1763                 return 0;
1764         }
1765
1766         dev_dbg(&port->dev, "%s", " Baud calculation Failed...\n");
1767         return -1;
1768 #endif
1769 }
1770
1771 /*****************************************************************************
1772  * mos7840_send_cmd_write_baud_rate
1773  *      this function sends the proper command to change the baud rate of the
1774  *      specified port.
1775  *****************************************************************************/
1776
1777 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1778                                             int baudRate)
1779 {
1780         int divisor = 0;
1781         int status;
1782         __u16 Data;
1783         unsigned char number;
1784         __u16 clk_sel_val;
1785         struct usb_serial_port *port;
1786
1787         if (mos7840_port == NULL)
1788                 return -1;
1789
1790         port = mos7840_port->port;
1791         if (mos7840_port_paranoia_check(port, __func__))
1792                 return -1;
1793
1794         if (mos7840_serial_paranoia_check(port->serial, __func__))
1795                 return -1;
1796
1797         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1798
1799         dev_dbg(&port->dev, "%s - port = %d, baud = %d\n", __func__,
1800                 mos7840_port->port->number, baudRate);
1801         /* reset clk_uart_sel in spregOffset */
1802         if (baudRate > 115200) {
1803 #ifdef HW_flow_control
1804                 /* NOTE: need to see the pther register to modify */
1805                 /* setting h/w flow control bit to 1 */
1806                 Data = 0x2b;
1807                 mos7840_port->shadowMCR = Data;
1808                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1809                                                                         Data);
1810                 if (status < 0) {
1811                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1812                         return -1;
1813                 }
1814 #endif
1815
1816         } else {
1817 #ifdef HW_flow_control
1818                 /* setting h/w flow control bit to 0 */
1819                 Data = 0xb;
1820                 mos7840_port->shadowMCR = Data;
1821                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1822                                                                         Data);
1823                 if (status < 0) {
1824                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1825                         return -1;
1826                 }
1827 #endif
1828
1829         }
1830
1831         if (1) {                /* baudRate <= 115200) */
1832                 clk_sel_val = 0x0;
1833                 Data = 0x0;
1834                 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1835                                                    &clk_sel_val);
1836                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1837                                                                  &Data);
1838                 if (status < 0) {
1839                         dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1840                         return -1;
1841                 }
1842                 Data = (Data & 0x8f) | clk_sel_val;
1843                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1844                                                                 Data);
1845                 if (status < 0) {
1846                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1847                         return -1;
1848                 }
1849                 /* Calculate the Divisor */
1850
1851                 if (status) {
1852                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1853                         return status;
1854                 }
1855                 /* Enable access to divisor latch */
1856                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1857                 mos7840_port->shadowLCR = Data;
1858                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1859
1860                 /* Write the divisor */
1861                 Data = (unsigned char)(divisor & 0xff);
1862                 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1863                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1864
1865                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1866                 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1867                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1868
1869                 /* Disable access to divisor latch */
1870                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1871                 mos7840_port->shadowLCR = Data;
1872                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1873
1874         }
1875         return status;
1876 }
1877
1878 /*****************************************************************************
1879  * mos7840_change_port_settings
1880  *      This routine is called to set the UART on the device to match
1881  *      the specified new settings.
1882  *****************************************************************************/
1883
1884 static void mos7840_change_port_settings(struct tty_struct *tty,
1885         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1886 {
1887         int baud;
1888         unsigned cflag;
1889         unsigned iflag;
1890         __u8 lData;
1891         __u8 lParity;
1892         __u8 lStop;
1893         int status;
1894         __u16 Data;
1895         struct usb_serial_port *port;
1896         struct usb_serial *serial;
1897
1898         if (mos7840_port == NULL)
1899                 return;
1900
1901         port = mos7840_port->port;
1902
1903         if (mos7840_port_paranoia_check(port, __func__))
1904                 return;
1905
1906         if (mos7840_serial_paranoia_check(port->serial, __func__))
1907                 return;
1908
1909         serial = port->serial;
1910
1911         if (!mos7840_port->open) {
1912                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1913                 return;
1914         }
1915
1916         lData = LCR_BITS_8;
1917         lStop = LCR_STOP_1;
1918         lParity = LCR_PAR_NONE;
1919
1920         cflag = tty->termios.c_cflag;
1921         iflag = tty->termios.c_iflag;
1922
1923         /* Change the number of bits */
1924         if (cflag & CSIZE) {
1925                 switch (cflag & CSIZE) {
1926                 case CS5:
1927                         lData = LCR_BITS_5;
1928                         break;
1929
1930                 case CS6:
1931                         lData = LCR_BITS_6;
1932                         break;
1933
1934                 case CS7:
1935                         lData = LCR_BITS_7;
1936                         break;
1937                 default:
1938                 case CS8:
1939                         lData = LCR_BITS_8;
1940                         break;
1941                 }
1942         }
1943         /* Change the Parity bit */
1944         if (cflag & PARENB) {
1945                 if (cflag & PARODD) {
1946                         lParity = LCR_PAR_ODD;
1947                         dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1948                 } else {
1949                         lParity = LCR_PAR_EVEN;
1950                         dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1951                 }
1952
1953         } else {
1954                 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1955         }
1956
1957         if (cflag & CMSPAR)
1958                 lParity = lParity | 0x20;
1959
1960         /* Change the Stop bit */
1961         if (cflag & CSTOPB) {
1962                 lStop = LCR_STOP_2;
1963                 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1964         } else {
1965                 lStop = LCR_STOP_1;
1966                 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1967         }
1968
1969         /* Update the LCR with the correct value */
1970         mos7840_port->shadowLCR &=
1971             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1972         mos7840_port->shadowLCR |= (lData | lParity | lStop);
1973
1974         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1975                 mos7840_port->shadowLCR);
1976         /* Disable Interrupts */
1977         Data = 0x00;
1978         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1979
1980         Data = 0x00;
1981         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1982
1983         Data = 0xcf;
1984         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1985
1986         /* Send the updated LCR value to the mos7840 */
1987         Data = mos7840_port->shadowLCR;
1988
1989         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1990
1991         Data = 0x00b;
1992         mos7840_port->shadowMCR = Data;
1993         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1994         Data = 0x00b;
1995         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1996
1997         /* set up the MCR register and send it to the mos7840 */
1998
1999         mos7840_port->shadowMCR = MCR_MASTER_IE;
2000         if (cflag & CBAUD)
2001                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2002
2003         if (cflag & CRTSCTS)
2004                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2005         else
2006                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2007
2008         Data = mos7840_port->shadowMCR;
2009         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2010
2011         /* Determine divisor based on baud rate */
2012         baud = tty_get_baud_rate(tty);
2013
2014         if (!baud) {
2015                 /* pick a default, any default... */
2016                 dev_dbg(&port->dev, "%s", "Picked default baud...\n");
2017                 baud = 9600;
2018         }
2019
2020         dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
2021         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2022
2023         /* Enable Interrupts */
2024         Data = 0x0c;
2025         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2026
2027         if (mos7840_port->read_urb_busy == false) {
2028                 mos7840_port->read_urb_busy = true;
2029                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2030                 if (status) {
2031                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
2032                             status);
2033                         mos7840_port->read_urb_busy = false;
2034                 }
2035         }
2036         wake_up(&mos7840_port->delta_msr_wait);
2037         mos7840_port->delta_msr_cond = 1;
2038         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
2039                 mos7840_port->shadowLCR);
2040 }
2041
2042 /*****************************************************************************
2043  * mos7840_set_termios
2044  *      this function is called by the tty driver when it wants to change
2045  *      the termios structure
2046  *****************************************************************************/
2047
2048 static void mos7840_set_termios(struct tty_struct *tty,
2049                                 struct usb_serial_port *port,
2050                                 struct ktermios *old_termios)
2051 {
2052         int status;
2053         unsigned int cflag;
2054         struct usb_serial *serial;
2055         struct moschip_port *mos7840_port;
2056
2057         if (mos7840_port_paranoia_check(port, __func__))
2058                 return;
2059
2060         serial = port->serial;
2061
2062         if (mos7840_serial_paranoia_check(serial, __func__))
2063                 return;
2064
2065         mos7840_port = mos7840_get_port_private(port);
2066
2067         if (mos7840_port == NULL)
2068                 return;
2069
2070         if (!mos7840_port->open) {
2071                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
2072                 return;
2073         }
2074
2075         dev_dbg(&port->dev, "%s", "setting termios - \n");
2076
2077         cflag = tty->termios.c_cflag;
2078
2079         dev_dbg(&port->dev, "%s - clfag %08x iflag %08x\n", __func__,
2080                 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
2081         dev_dbg(&port->dev, "%s - old clfag %08x old iflag %08x\n", __func__,
2082                 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2083         dev_dbg(&port->dev, "%s - port %d\n", __func__, port->number);
2084
2085         /* change the port settings to the new ones specified */
2086
2087         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2088
2089         if (!mos7840_port->read_urb) {
2090                 dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n");
2091                 return;
2092         }
2093
2094         if (mos7840_port->read_urb_busy == false) {
2095                 mos7840_port->read_urb_busy = true;
2096                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2097                 if (status) {
2098                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
2099                             status);
2100                         mos7840_port->read_urb_busy = false;
2101                 }
2102         }
2103 }
2104
2105 /*****************************************************************************
2106  * mos7840_get_lsr_info - get line status register info
2107  *
2108  * Purpose: Let user call ioctl() to get info when the UART physically
2109  *          is emptied.  On bus types like RS485, the transmitter must
2110  *          release the bus after transmitting. This must be done when
2111  *          the transmit shift register is empty, not be done when the
2112  *          transmit holding register is empty.  This functionality
2113  *          allows an RS485 driver to be written in user space.
2114  *****************************************************************************/
2115
2116 static int mos7840_get_lsr_info(struct tty_struct *tty,
2117                                 unsigned int __user *value)
2118 {
2119         int count;
2120         unsigned int result = 0;
2121
2122         count = mos7840_chars_in_buffer(tty);
2123         if (count == 0)
2124                 result = TIOCSER_TEMT;
2125
2126         if (copy_to_user(value, &result, sizeof(int)))
2127                 return -EFAULT;
2128         return 0;
2129 }
2130
2131 /*****************************************************************************
2132  * mos7840_get_serial_info
2133  *      function to get information about serial port
2134  *****************************************************************************/
2135
2136 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2137                                    struct serial_struct __user *retinfo)
2138 {
2139         struct serial_struct tmp;
2140
2141         if (mos7840_port == NULL)
2142                 return -1;
2143
2144         if (!retinfo)
2145                 return -EFAULT;
2146
2147         memset(&tmp, 0, sizeof(tmp));
2148
2149         tmp.type = PORT_16550A;
2150         tmp.line = mos7840_port->port->serial->minor;
2151         tmp.port = mos7840_port->port->number;
2152         tmp.irq = 0;
2153         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2154         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2155         tmp.baud_base = 9600;
2156         tmp.close_delay = 5 * HZ;
2157         tmp.closing_wait = 30 * HZ;
2158
2159         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2160                 return -EFAULT;
2161         return 0;
2162 }
2163
2164 static int mos7840_get_icount(struct tty_struct *tty,
2165                         struct serial_icounter_struct *icount)
2166 {
2167         struct usb_serial_port *port = tty->driver_data;
2168         struct moschip_port *mos7840_port;
2169         struct async_icount cnow;
2170
2171         mos7840_port = mos7840_get_port_private(port);
2172         cnow = mos7840_port->icount;
2173
2174         smp_rmb();
2175         icount->cts = cnow.cts;
2176         icount->dsr = cnow.dsr;
2177         icount->rng = cnow.rng;
2178         icount->dcd = cnow.dcd;
2179         icount->rx = cnow.rx;
2180         icount->tx = cnow.tx;
2181         icount->frame = cnow.frame;
2182         icount->overrun = cnow.overrun;
2183         icount->parity = cnow.parity;
2184         icount->brk = cnow.brk;
2185         icount->buf_overrun = cnow.buf_overrun;
2186
2187         dev_dbg(&port->dev, "%s TIOCGICOUNT RX=%d, TX=%d\n", __func__,
2188                 icount->rx, icount->tx);
2189         return 0;
2190 }
2191
2192 /*****************************************************************************
2193  * SerialIoctl
2194  *      this function handles any ioctl calls to the driver
2195  *****************************************************************************/
2196
2197 static int mos7840_ioctl(struct tty_struct *tty,
2198                          unsigned int cmd, unsigned long arg)
2199 {
2200         struct usb_serial_port *port = tty->driver_data;
2201         void __user *argp = (void __user *)arg;
2202         struct moschip_port *mos7840_port;
2203
2204         struct async_icount cnow;
2205         struct async_icount cprev;
2206
2207         if (mos7840_port_paranoia_check(port, __func__))
2208                 return -1;
2209
2210         mos7840_port = mos7840_get_port_private(port);
2211
2212         if (mos7840_port == NULL)
2213                 return -1;
2214
2215         dev_dbg(&port->dev, "%s - cmd = 0x%x\n", __func__, cmd);
2216
2217         switch (cmd) {
2218                 /* return number of bytes available */
2219
2220         case TIOCSERGETLSR:
2221                 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
2222                 return mos7840_get_lsr_info(tty, argp);
2223
2224         case TIOCGSERIAL:
2225                 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
2226                 return mos7840_get_serial_info(mos7840_port, argp);
2227
2228         case TIOCSSERIAL:
2229                 dev_dbg(&port->dev, "%s TIOCSSERIAL\n", __func__);
2230                 break;
2231
2232         case TIOCMIWAIT:
2233                 dev_dbg(&port->dev, "%s  TIOCMIWAIT\n", __func__);
2234                 cprev = mos7840_port->icount;
2235                 while (1) {
2236                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2237                         mos7840_port->delta_msr_cond = 0;
2238                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2239                                                  (mos7840_port->
2240                                                   delta_msr_cond == 1));
2241
2242                         /* see if a signal did it */
2243                         if (signal_pending(current))
2244                                 return -ERESTARTSYS;
2245                         cnow = mos7840_port->icount;
2246                         smp_rmb();
2247                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2248                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2249                                 return -EIO;    /* no change => error */
2250                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2251                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2252                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2253                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2254                                 return 0;
2255                         }
2256                         cprev = cnow;
2257                 }
2258                 /* NOTREACHED */
2259                 break;
2260
2261         default:
2262                 break;
2263         }
2264         return -ENOIOCTLCMD;
2265 }
2266
2267 static int mos7810_check(struct usb_serial *serial)
2268 {
2269         int i, pass_count = 0;
2270         __u16 data = 0, mcr_data = 0;
2271         __u16 test_pattern = 0x55AA;
2272
2273         /* Store MCR setting */
2274         usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2275                 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
2276                 &mcr_data, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2277
2278         for (i = 0; i < 16; i++) {
2279                 /* Send the 1-bit test pattern out to MCS7810 test pin */
2280                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2281                         MCS_WRREQ, MCS_WR_RTYPE,
2282                         (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
2283                         MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
2284
2285                 /* Read the test pattern back */
2286                 usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2287                         MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &data,
2288                         VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2289
2290                 /* If this is a MCS7810 device, both test patterns must match */
2291                 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
2292                         break;
2293
2294                 pass_count++;
2295         }
2296
2297         /* Restore MCR setting */
2298         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
2299                 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
2300                 0, MOS_WDR_TIMEOUT);
2301
2302         if (pass_count == 16)
2303                 return 1;
2304
2305         return 0;
2306 }
2307
2308 static int mos7840_calc_num_ports(struct usb_serial *serial)
2309 {
2310         __u16 data = 0x00;
2311         int mos7840_num_ports;
2312
2313         usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2314                 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &data,
2315                 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2316
2317         if (serial->dev->descriptor.idProduct == MOSCHIP_DEVICE_ID_7810 ||
2318                 serial->dev->descriptor.idProduct == MOSCHIP_DEVICE_ID_7820) {
2319                 device_type = serial->dev->descriptor.idProduct;
2320         } else {
2321                 /* For a MCS7840 device GPIO0 must be set to 1 */
2322                 if ((data & 0x01) == 1)
2323                         device_type = MOSCHIP_DEVICE_ID_7840;
2324                 else if (mos7810_check(serial))
2325                         device_type = MOSCHIP_DEVICE_ID_7810;
2326                 else
2327                         device_type = MOSCHIP_DEVICE_ID_7820;
2328         }
2329
2330         mos7840_num_ports = (device_type >> 4) & 0x000F;
2331         serial->num_bulk_in = mos7840_num_ports;
2332         serial->num_bulk_out = mos7840_num_ports;
2333         serial->num_ports = mos7840_num_ports;
2334
2335         return mos7840_num_ports;
2336 }
2337
2338 /****************************************************************************
2339  * mos7840_startup
2340  ****************************************************************************/
2341
2342 static int mos7840_startup(struct usb_serial *serial)
2343 {
2344         struct moschip_port *mos7840_port;
2345         struct usb_device *dev;
2346         int i, status;
2347         __u16 Data;
2348
2349         dev = serial->dev;
2350
2351         /* we set up the pointers to the endpoints in the mos7840_open *
2352          * function, as the structures aren't created yet.             */
2353
2354         /* set up port private structures */
2355         for (i = 0; i < serial->num_ports; ++i) {
2356                 dev_dbg(&dev->dev, "mos7840_startup: configuring port %d............\n", i);
2357                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2358                 if (mos7840_port == NULL) {
2359                         dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2360                         status = -ENOMEM;
2361                         i--; /* don't follow NULL pointer cleaning up */
2362                         goto error;
2363                 }
2364
2365                 /* Initialize all port interrupt end point to port 0 int
2366                  * endpoint. Our device has only one interrupt end point
2367                  * common to all port */
2368
2369                 mos7840_port->port = serial->port[i];
2370                 mos7840_set_port_private(serial->port[i], mos7840_port);
2371                 spin_lock_init(&mos7840_port->pool_lock);
2372
2373                 /* minor is not initialised until later by
2374                  * usb-serial.c:get_free_serial() and cannot therefore be used
2375                  * to index device instances */
2376                 mos7840_port->port_num = i + 1;
2377                 dev_dbg(&dev->dev, "serial->port[i]->number = %d\n", serial->port[i]->number);
2378                 dev_dbg(&dev->dev, "serial->port[i]->serial->minor = %d\n", serial->port[i]->serial->minor);
2379                 dev_dbg(&dev->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
2380                 dev_dbg(&dev->dev, "serial->minor = %d\n", serial->minor);
2381
2382                 if (mos7840_port->port_num == 1) {
2383                         mos7840_port->SpRegOffset = 0x0;
2384                         mos7840_port->ControlRegOffset = 0x1;
2385                         mos7840_port->DcrRegOffset = 0x4;
2386                 } else if ((mos7840_port->port_num == 2)
2387                            && (serial->num_ports == 4)) {
2388                         mos7840_port->SpRegOffset = 0x8;
2389                         mos7840_port->ControlRegOffset = 0x9;
2390                         mos7840_port->DcrRegOffset = 0x16;
2391                 } else if ((mos7840_port->port_num == 2)
2392                            && (serial->num_ports == 2)) {
2393                         mos7840_port->SpRegOffset = 0xa;
2394                         mos7840_port->ControlRegOffset = 0xb;
2395                         mos7840_port->DcrRegOffset = 0x19;
2396                 } else if ((mos7840_port->port_num == 3)
2397                            && (serial->num_ports == 4)) {
2398                         mos7840_port->SpRegOffset = 0xa;
2399                         mos7840_port->ControlRegOffset = 0xb;
2400                         mos7840_port->DcrRegOffset = 0x19;
2401                 } else if ((mos7840_port->port_num == 4)
2402                            && (serial->num_ports == 4)) {
2403                         mos7840_port->SpRegOffset = 0xc;
2404                         mos7840_port->ControlRegOffset = 0xd;
2405                         mos7840_port->DcrRegOffset = 0x1c;
2406                 }
2407                 mos7840_dump_serial_port(serial->port[i], mos7840_port);
2408                 mos7840_set_port_private(serial->port[i], mos7840_port);
2409
2410                 /* enable rx_disable bit in control register */
2411                 status = mos7840_get_reg_sync(serial->port[i],
2412                                  mos7840_port->ControlRegOffset, &Data);
2413                 if (status < 0) {
2414                         dev_dbg(&dev->dev, "Reading ControlReg failed status-0x%x\n", status);
2415                         break;
2416                 } else
2417                         dev_dbg(&dev->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
2418                 Data |= 0x08;   /* setting driver done bit */
2419                 Data |= 0x04;   /* sp1_bit to have cts change reflect in
2420                                    modem status reg */
2421
2422                 /* Data |= 0x20; //rx_disable bit */
2423                 status = mos7840_set_reg_sync(serial->port[i],
2424                                          mos7840_port->ControlRegOffset, Data);
2425                 if (status < 0) {
2426                         dev_dbg(&dev->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2427                         break;
2428                 } else
2429                         dev_dbg(&dev->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
2430
2431                 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2432                    and 0x24 in DCR3 */
2433                 Data = 0x01;
2434                 status = mos7840_set_reg_sync(serial->port[i],
2435                          (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2436                 if (status < 0) {
2437                         dev_dbg(&dev->dev, "Writing DCR0 failed status-0x%x\n", status);
2438                         break;
2439                 } else
2440                         dev_dbg(&dev->dev, "DCR0 Writing success status%d\n", status);
2441
2442                 Data = 0x05;
2443                 status = mos7840_set_reg_sync(serial->port[i],
2444                          (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2445                 if (status < 0) {
2446                         dev_dbg(&dev->dev, "Writing DCR1 failed status-0x%x\n", status);
2447                         break;
2448                 } else
2449                         dev_dbg(&dev->dev, "DCR1 Writing success status%d\n", status);
2450
2451                 Data = 0x24;
2452                 status = mos7840_set_reg_sync(serial->port[i],
2453                          (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2454                 if (status < 0) {
2455                         dev_dbg(&dev->dev, "Writing DCR2 failed status-0x%x\n", status);
2456                         break;
2457                 } else
2458                         dev_dbg(&dev->dev, "DCR2 Writing success status%d\n", status);
2459
2460                 /* write values in clkstart0x0 and clkmulti 0x20 */
2461                 Data = 0x0;
2462                 status = mos7840_set_reg_sync(serial->port[i],
2463                                          CLK_START_VALUE_REGISTER, Data);
2464                 if (status < 0) {
2465                         dev_dbg(&dev->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2466                         break;
2467                 } else
2468                         dev_dbg(&dev->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2469
2470                 Data = 0x20;
2471                 status = mos7840_set_reg_sync(serial->port[i],
2472                                         CLK_MULTI_REGISTER, Data);
2473                 if (status < 0) {
2474                         dev_dbg(&dev->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
2475                         goto error;
2476                 } else
2477                         dev_dbg(&dev->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
2478
2479                 /* write value 0x0 to scratchpad register */
2480                 Data = 0x00;
2481                 status = mos7840_set_uart_reg(serial->port[i],
2482                                                 SCRATCH_PAD_REGISTER, Data);
2483                 if (status < 0) {
2484                         dev_dbg(&dev->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
2485                         break;
2486                 } else
2487                         dev_dbg(&dev->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
2488
2489                 /* Zero Length flag register */
2490                 if ((mos7840_port->port_num != 1)
2491                     && (serial->num_ports == 2)) {
2492
2493                         Data = 0xff;
2494                         status = mos7840_set_reg_sync(serial->port[i],
2495                                       (__u16) (ZLP_REG1 +
2496                                       ((__u16)mos7840_port->port_num)), Data);
2497                         dev_dbg(&dev->dev, "ZLIP offset %x\n",
2498                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
2499                         if (status < 0) {
2500                                 dev_dbg(&dev->dev, "Writing ZLP_REG%d failed status-0x%x\n", i + 2, status);
2501                                 break;
2502                         } else
2503                                 dev_dbg(&dev->dev, "ZLP_REG%d Writing success status%d\n", i + 2, status);
2504                 } else {
2505                         Data = 0xff;
2506                         status = mos7840_set_reg_sync(serial->port[i],
2507                               (__u16) (ZLP_REG1 +
2508                               ((__u16)mos7840_port->port_num) - 0x1), Data);
2509                         dev_dbg(&dev->dev, "ZLIP offset %x\n",
2510                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
2511                         if (status < 0) {
2512                                 dev_dbg(&dev->dev, "Writing ZLP_REG%d failed status-0x%x\n", i + 1, status);
2513                                 break;
2514                         } else
2515                                 dev_dbg(&dev->dev, "ZLP_REG%d Writing success status%d\n", i + 1, status);
2516
2517                 }
2518                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2519                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2520                 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2521                                                                 GFP_KERNEL);
2522                 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2523                                                         !mos7840_port->dr) {
2524                         status = -ENOMEM;
2525                         goto error;
2526                 }
2527
2528                 mos7840_port->has_led = false;
2529
2530                 /* Initialize LED timers */
2531                 if (device_type == MOSCHIP_DEVICE_ID_7810) {
2532                         mos7840_port->has_led = true;
2533
2534                         init_timer(&mos7840_port->led_timer1);
2535                         mos7840_port->led_timer1.function = mos7840_led_off;
2536                         mos7840_port->led_timer1.expires =
2537                                         jiffies + msecs_to_jiffies(LED_ON_MS);
2538                         mos7840_port->led_timer1.data =
2539                                                 (unsigned long)mos7840_port;
2540
2541                         init_timer(&mos7840_port->led_timer2);
2542                         mos7840_port->led_timer2.function =
2543                                                 mos7840_led_flag_off;
2544                         mos7840_port->led_timer2.expires =
2545                                         jiffies + msecs_to_jiffies(LED_OFF_MS);
2546                         mos7840_port->led_timer2.data =
2547                                                 (unsigned long)mos7840_port;
2548
2549                         mos7840_port->led_flag = false;
2550
2551                         /* Turn off LED */
2552                         mos7840_set_led_sync(serial->port[i],
2553                                                 MODEM_CONTROL_REGISTER, 0x0300);
2554                 }
2555         }
2556
2557         /* Zero Length flag enable */
2558         Data = 0x0f;
2559         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2560         if (status < 0) {
2561                 dev_dbg(&dev->dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
2562                 goto error;
2563         } else
2564                 dev_dbg(&dev->dev, "ZLP_REG5 Writing success status%d\n", status);
2565
2566         /* setting configuration feature to one */
2567         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2568                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, MOS_WDR_TIMEOUT);
2569         return 0;
2570 error:
2571         for (/* nothing */; i >= 0; i--) {
2572                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2573
2574                 kfree(mos7840_port->dr);
2575                 kfree(mos7840_port->ctrl_buf);
2576                 usb_free_urb(mos7840_port->control_urb);
2577                 kfree(mos7840_port);
2578         }
2579         return status;
2580 }
2581
2582 /****************************************************************************
2583  * mos7840_disconnect
2584  *      This function is called whenever the device is removed from the usb bus.
2585  ****************************************************************************/
2586
2587 static void mos7840_disconnect(struct usb_serial *serial)
2588 {
2589         int i;
2590         unsigned long flags;
2591         struct moschip_port *mos7840_port;
2592
2593         /* check for the ports to be closed,close the ports and disconnect */
2594
2595         /* free private structure allocated for serial port  *
2596          * stop reads and writes on all ports                */
2597
2598         for (i = 0; i < serial->num_ports; ++i) {
2599                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2600                 if (mos7840_port) {
2601                         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2602                         mos7840_port->zombie = 1;
2603                         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2604                         usb_kill_urb(mos7840_port->control_urb);
2605                 }
2606         }
2607 }
2608
2609 /****************************************************************************
2610  * mos7840_release
2611  *      This function is called when the usb_serial structure is freed.
2612  ****************************************************************************/
2613
2614 static void mos7840_release(struct usb_serial *serial)
2615 {
2616         int i;
2617         struct moschip_port *mos7840_port;
2618
2619         /* check for the ports to be closed,close the ports and disconnect */
2620
2621         /* free private structure allocated for serial port  *
2622          * stop reads and writes on all ports                */
2623
2624         for (i = 0; i < serial->num_ports; ++i) {
2625                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2626                 if (mos7840_port) {
2627                         if (mos7840_port->has_led) {
2628                                 /* Turn off LED */
2629                                 mos7840_set_led_sync(mos7840_port->port,
2630                                                 MODEM_CONTROL_REGISTER, 0x0300);
2631
2632                                 del_timer_sync(&mos7840_port->led_timer1);
2633                                 del_timer_sync(&mos7840_port->led_timer2);
2634                         }
2635                         usb_free_urb(mos7840_port->control_urb);
2636                         kfree(mos7840_port->ctrl_buf);
2637                         kfree(mos7840_port->dr);
2638                         kfree(mos7840_port);
2639                 }
2640         }
2641 }
2642
2643 static struct usb_serial_driver moschip7840_4port_device = {
2644         .driver = {
2645                    .owner = THIS_MODULE,
2646                    .name = "mos7840",
2647                    },
2648         .description = DRIVER_DESC,
2649         .id_table = id_table,
2650         .num_ports = 4,
2651         .open = mos7840_open,
2652         .close = mos7840_close,
2653         .write = mos7840_write,
2654         .write_room = mos7840_write_room,
2655         .chars_in_buffer = mos7840_chars_in_buffer,
2656         .throttle = mos7840_throttle,
2657         .unthrottle = mos7840_unthrottle,
2658         .calc_num_ports = mos7840_calc_num_ports,
2659 #ifdef MCSSerialProbe
2660         .probe = mos7840_serial_probe,
2661 #endif
2662         .ioctl = mos7840_ioctl,
2663         .set_termios = mos7840_set_termios,
2664         .break_ctl = mos7840_break,
2665         .tiocmget = mos7840_tiocmget,
2666         .tiocmset = mos7840_tiocmset,
2667         .get_icount = mos7840_get_icount,
2668         .attach = mos7840_startup,
2669         .disconnect = mos7840_disconnect,
2670         .release = mos7840_release,
2671         .read_bulk_callback = mos7840_bulk_in_callback,
2672         .read_int_callback = mos7840_interrupt_callback,
2673 };
2674
2675 static struct usb_serial_driver * const serial_drivers[] = {
2676         &moschip7840_4port_device, NULL
2677 };
2678
2679 module_usb_serial_driver(serial_drivers, id_table);
2680
2681 MODULE_DESCRIPTION(DRIVER_DESC);
2682 MODULE_LICENSE("GPL");