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 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
  39
  40 /*
  41  * 16C50 UART register defines
  42  */
  43
  44 #define LCR_BITS_5             0x00     /* 5 bits/char */
  45 #define LCR_BITS_6             0x01     /* 6 bits/char */
  46 #define LCR_BITS_7             0x02     /* 7 bits/char */
  47 #define LCR_BITS_8             0x03     /* 8 bits/char */
  48 #define LCR_BITS_MASK          0x03     /* Mask for bits/char field */
  49
  50 #define LCR_STOP_1             0x00     /* 1 stop bit */
  51 #define LCR_STOP_1_5           0x04     /* 1.5 stop bits (if 5   bits/char) */
  52 #define LCR_STOP_2             0x04     /* 2 stop bits   (if 6-8 bits/char) */
  53 #define LCR_STOP_MASK          0x04     /* Mask for stop bits field */
  54
  55 #define LCR_PAR_NONE           0x00     /* No parity */
  56 #define LCR_PAR_ODD            0x08     /* Odd parity */
  57 #define LCR_PAR_EVEN           0x18     /* Even parity */
  58 #define LCR_PAR_MARK           0x28     /* Force parity bit to 1 */
  59 #define LCR_PAR_SPACE          0x38     /* Force parity bit to 0 */
  60 #define LCR_PAR_MASK           0x38     /* Mask for parity field */
  61
  62 #define LCR_SET_BREAK          0x40     /* Set Break condition */
  63 #define LCR_DL_ENABLE          0x80     /* Enable access to divisor latch */
  64
  65 #define MCR_DTR                0x01     /* Assert DTR */
  66 #define MCR_RTS                0x02     /* Assert RTS */
  67 #define MCR_OUT1               0x04     /* Loopback only: Sets state of RI */
  68 #define MCR_MASTER_IE          0x08     /* Enable interrupt outputs */
  69 #define MCR_LOOPBACK           0x10     /* Set internal (digital) loopback mode */
  70 #define MCR_XON_ANY            0x20     /* Enable any char to exit XOFF mode */
  71
  72 #define MOS7840_MSR_CTS        0x10     /* Current state of CTS */
  73 #define MOS7840_MSR_DSR        0x20     /* Current state of DSR */
  74 #define MOS7840_MSR_RI         0x40     /* Current state of RI */
  75 #define MOS7840_MSR_CD         0x80     /* Current state of CD */
  76
  77 /*
  78  * Defines used for sending commands to port
  79  */
  80
  81 #define MOS_WDR_TIMEOUT         5000    /* default urb timeout */
  82
  83 #define MOS_PORT1       0x0200
  84 #define MOS_PORT2       0x0300
  85 #define MOS_VENREG      0x0000
  86 #define MOS_MAX_PORT    0x02
  87 #define MOS_WRITE       0x0E
  88 #define MOS_READ        0x0D
  89
  90 /* Requests */
  91 #define MCS_RD_RTYPE    0xC0
  92 #define MCS_WR_RTYPE    0x40
  93 #define MCS_RDREQ       0x0D
  94 #define MCS_WRREQ       0x0E
  95 #define MCS_CTRL_TIMEOUT        500
  96 #define VENDOR_READ_LENGTH      (0x01)
  97
  98 #define MAX_NAME_LEN    64
  99
 100 #define ZLP_REG1  0x3A          /* Zero_Flag_Reg1    58 */
 101 #define ZLP_REG5  0x3E          /* Zero_Flag_Reg5    62 */
 102
 103 /* For higher baud Rates use TIOCEXBAUD */
 104 #define TIOCEXBAUD     0x5462
 105
 106 /* vendor id and device id defines */
 107
 108 /* The native mos7840/7820 component */
 109 #define USB_VENDOR_ID_MOSCHIP           0x9710
 110 #define MOSCHIP_DEVICE_ID_7840          0x7840
 111 #define MOSCHIP_DEVICE_ID_7820          0x7820
 112 #define MOSCHIP_DEVICE_ID_7810          0x7810
 113 /* The native component can have its vendor/device id's overridden
 114  * in vendor-specific implementations.  Such devices can be handled
 115  * by making a change here, in id_table.
 116  */
 117 #define USB_VENDOR_ID_BANDB              0x0856
 118 #define BANDB_DEVICE_ID_USO9ML2_2        0xAC22
 119 #define BANDB_DEVICE_ID_USO9ML2_2P       0xBC00
 120 #define BANDB_DEVICE_ID_USO9ML2_4        0xAC24
 121 #define BANDB_DEVICE_ID_USO9ML2_4P       0xBC01
 122 #define BANDB_DEVICE_ID_US9ML2_2         0xAC29
 123 #define BANDB_DEVICE_ID_US9ML2_4         0xAC30
 124 #define BANDB_DEVICE_ID_USPTL4_2         0xAC31
 125 #define BANDB_DEVICE_ID_USPTL4_4         0xAC32
 126 #define BANDB_DEVICE_ID_USOPTL4_2        0xAC42
 127 #define BANDB_DEVICE_ID_USOPTL4_2P       0xBC02
 128 #define BANDB_DEVICE_ID_USOPTL4_4        0xAC44
 129 #define BANDB_DEVICE_ID_USOPTL4_4P       0xBC03
 130 #define BANDB_DEVICE_ID_USOPTL2_4        0xAC24
 131
 132 /* This driver also supports
 133  * ATEN UC2324 device using Moschip MCS7840
 134  * ATEN UC2322 device using Moschip MCS7820
 135  */
 136 #define USB_VENDOR_ID_ATENINTL          0x0557
 137 #define ATENINTL_DEVICE_ID_UC2324       0x2011
 138 #define ATENINTL_DEVICE_ID_UC2322       0x7820
 139
 140 /* Interrupt Routine Defines    */
 141
 142 #define SERIAL_IIR_RLS      0x06
 143 #define SERIAL_IIR_MS       0x00
 144
 145 /*
 146  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 147  */
 148 #define SERIAL_LSR_DR       0x0001
 149 #define SERIAL_LSR_OE       0x0002
 150 #define SERIAL_LSR_PE       0x0004
 151 #define SERIAL_LSR_FE       0x0008
 152 #define SERIAL_LSR_BI       0x0010
 153
 154 #define MOS_MSR_DELTA_CTS   0x10
 155 #define MOS_MSR_DELTA_DSR   0x20
 156 #define MOS_MSR_DELTA_RI    0x40
 157 #define MOS_MSR_DELTA_CD    0x80
 158
 159 /* Serial Port register Address */
 160 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 161 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 162 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 163 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 164 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 165 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 166 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 167 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 168 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 169
 170 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 171 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 172 #define GPIO_REGISTER              ((__u16)(0x07))
 173
 174 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 175
 176 /*
 177  * URB POOL related defines
 178  */
 179 #define NUM_URBS                        16      /* URB Count */
 180 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 181
 182 /* LED on/off milliseconds*/
 183 #define LED_ON_MS       500
 184 #define LED_OFF_MS      500
 185
 186 enum mos7840_flag {
 187         MOS7840_FLAG_CTRL_BUSY,
 188         MOS7840_FLAG_LED_BUSY,
 189 };
 190
 191 static const struct usb_device_id id_table[] = {
 192         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 193         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 194         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
 195         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
 196         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
 197         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 198         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
 199         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 200         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 201         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 202         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 203         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 204         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
 205         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 206         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
 207         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
 208         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 209         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 210         {}                      /* terminating entry */
 211 };
 212 MODULE_DEVICE_TABLE(usb, id_table);
 213
 214 /* This structure holds all of the local port information */
 215
 216 struct moschip_port {
 217         int port_num;           /*Actual port number in the device(1,2,etc) */
 218         struct urb *write_urb;  /* write URB for this port */
 219         struct urb *read_urb;   /* read URB for this port */
 220         __u8 shadowLCR;         /* last LCR value received */
 221         __u8 shadowMCR;         /* last MCR value received */
 222         char open;
 223         char open_ports;
 224         struct usb_serial_port *port;   /* loop back to the owner of this object */
 225
 226         /* Offsets */
 227         __u8 SpRegOffset;
 228         __u8 ControlRegOffset;
 229         __u8 DcrRegOffset;
 230         /* for processing control URBS in interrupt context */
 231         struct urb *control_urb;
 232         struct usb_ctrlrequest *dr;
 233         char *ctrl_buf;
 234         int MsrLsr;
 235
 236         spinlock_t pool_lock;
 237         struct urb *write_urb_pool[NUM_URBS];
 238         char busy[NUM_URBS];
 239         bool read_urb_busy;
 240
 241         /* For device(s) with LED indicator */
 242         bool has_led;
 243         struct timer_list led_timer1;   /* Timer for LED on */
 244         struct timer_list led_timer2;   /* Timer for LED off */
 245         struct urb *led_urb;
 246         struct usb_ctrlrequest *led_dr;
 247
 248         unsigned long flags;
 249 };
 250
 251 /*
 252  * mos7840_set_reg_sync
 253  *      To set the Control register by calling usb_fill_control_urb function
 254  *      by passing usb_sndctrlpipe function as parameter.
 255  */
 256
 257 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 258                                 __u16 val)
 259 {
 260         struct usb_device *dev = port->serial->dev;
 261         val = val & 0x00ff;
 262         dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
 263
 264         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 265                                MCS_WR_RTYPE, val, reg, NULL, 0,
 266                                MOS_WDR_TIMEOUT);
 267 }
 268
 269 /*
 270  * mos7840_get_reg_sync
 271  *      To set the Uart register by calling usb_fill_control_urb function by
 272  *      passing usb_rcvctrlpipe function as parameter.
 273  */
 274
 275 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 276                                 __u16 *val)
 277 {
 278         struct usb_device *dev = port->serial->dev;
 279         int ret = 0;
 280         u8 *buf;
 281
 282         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 283         if (!buf)
 284                 return -ENOMEM;
 285
 286         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 287                               MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
 288                               MOS_WDR_TIMEOUT);
 289         *val = buf[0];
 290         dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
 291
 292         kfree(buf);
 293         return ret;
 294 }
 295
 296 /*
 297  * mos7840_set_uart_reg
 298  *      To set the Uart register by calling usb_fill_control_urb function by
 299  *      passing usb_sndctrlpipe function as parameter.
 300  */
 301
 302 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 303                                 __u16 val)
 304 {
 305
 306         struct usb_device *dev = port->serial->dev;
 307         val = val & 0x00ff;
 308         /* For the UART control registers, the application number need
 309            to be Or'ed */
 310         if (port->serial->num_ports == 4) {
 311                 val |= ((__u16)port->port_number + 1) << 8;
 312         } else {
 313                 if (port->port_number == 0) {
 314                         val |= ((__u16)port->port_number + 1) << 8;
 315                 } else {
 316                         val |= ((__u16)port->port_number + 2) << 8;
 317                 }
 318         }
 319         dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
 320         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 321                                MCS_WR_RTYPE, val, reg, NULL, 0,
 322                                MOS_WDR_TIMEOUT);
 323
 324 }
 325
 326 /*
 327  * mos7840_get_uart_reg
 328  *      To set the Control register by calling usb_fill_control_urb function
 329  *      by passing usb_rcvctrlpipe function as parameter.
 330  */
 331 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 332                                 __u16 *val)
 333 {
 334         struct usb_device *dev = port->serial->dev;
 335         int ret = 0;
 336         __u16 Wval;
 337         u8 *buf;
 338
 339         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 340         if (!buf)
 341                 return -ENOMEM;
 342
 343         /* Wval  is same as application number */
 344         if (port->serial->num_ports == 4) {
 345                 Wval = ((__u16)port->port_number + 1) << 8;
 346         } else {
 347                 if (port->port_number == 0) {
 348                         Wval = ((__u16)port->port_number + 1) << 8;
 349                 } else {
 350                         Wval = ((__u16)port->port_number + 2) << 8;
 351                 }
 352         }
 353         dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
 354         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 355                               MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
 356                               MOS_WDR_TIMEOUT);
 357         *val = buf[0];
 358
 359         kfree(buf);
 360         return ret;
 361 }
 362
 363 static void mos7840_dump_serial_port(struct usb_serial_port *port,
 364                                      struct moschip_port *mos7840_port)
 365 {
 366
 367         dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
 368         dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
 369         dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
 370
 371 }
 372
 373 /************************************************************************/
 374 /************************************************************************/
 375 /*             I N T E R F A C E   F U N C T I O N S                    */
 376 /*             I N T E R F A C E   F U N C T I O N S                    */
 377 /************************************************************************/
 378 /************************************************************************/
 379
 380 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 381                                             struct moschip_port *data)
 382 {
 383         usb_set_serial_port_data(port, (void *)data);
 384 }
 385
 386 static inline struct moschip_port *mos7840_get_port_private(struct
 387                                                             usb_serial_port
 388                                                             *port)
 389 {
 390         return (struct moschip_port *)usb_get_serial_port_data(port);
 391 }
 392
 393 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 394 {
 395         struct moschip_port *mos7840_port;
 396         struct async_icount *icount;
 397         mos7840_port = port;
 398         if (new_msr &
 399             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 400              MOS_MSR_DELTA_CD)) {
 401                 icount = &mos7840_port->port->icount;
 402
 403                 /* update input line counters */
 404                 if (new_msr & MOS_MSR_DELTA_CTS)
 405                         icount->cts++;
 406                 if (new_msr & MOS_MSR_DELTA_DSR)
 407                         icount->dsr++;
 408                 if (new_msr & MOS_MSR_DELTA_CD)
 409                         icount->dcd++;
 410                 if (new_msr & MOS_MSR_DELTA_RI)
 411                         icount->rng++;
 412
 413                 wake_up_interruptible(&port->port->port.delta_msr_wait);
 414         }
 415 }
 416
 417 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 418 {
 419         struct async_icount *icount;
 420
 421         if (new_lsr & SERIAL_LSR_BI) {
 422                 /*
 423                  * Parity and Framing errors only count if they
 424                  * occur exclusive of a break being
 425                  * received.
 426                  */
 427                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 428         }
 429
 430         /* update input line counters */
 431         icount = &port->port->icount;
 432         if (new_lsr & SERIAL_LSR_BI)
 433                 icount->brk++;
 434         if (new_lsr & SERIAL_LSR_OE)
 435                 icount->overrun++;
 436         if (new_lsr & SERIAL_LSR_PE)
 437                 icount->parity++;
 438         if (new_lsr & SERIAL_LSR_FE)
 439                 icount->frame++;
 440 }
 441
 442 /************************************************************************/
 443 /************************************************************************/
 444 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 445 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 446 /************************************************************************/
 447 /************************************************************************/
 448
 449 static void mos7840_control_callback(struct urb *urb)
 450 {
 451         unsigned char *data;
 452         struct moschip_port *mos7840_port;
 453         struct device *dev = &urb->dev->dev;
 454         __u8 regval = 0x0;
 455         int status = urb->status;
 456
 457         mos7840_port = urb->context;
 458
 459         switch (status) {
 460         case 0:
 461                 /* success */
 462                 break;
 463         case -ECONNRESET:
 464         case -ENOENT:
 465         case -ESHUTDOWN:
 466                 /* this urb is terminated, clean up */
 467                 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
 468                 goto out;
 469         default:
 470                 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
 471                 goto out;
 472         }
 473
 474         dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length);
 475         dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__,
 476                 mos7840_port->MsrLsr, mos7840_port->port_num);
 477         data = urb->transfer_buffer;
 478         regval = (__u8) data[0];
 479         dev_dbg(dev, "%s data is %x\n", __func__, regval);
 480         if (mos7840_port->MsrLsr == 0)
 481                 mos7840_handle_new_msr(mos7840_port, regval);
 482         else if (mos7840_port->MsrLsr == 1)
 483                 mos7840_handle_new_lsr(mos7840_port, regval);
 484 out:
 485         clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mos7840_port->flags);
 486 }
 487
 488 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 489                            __u16 *val)
 490 {
 491         struct usb_device *dev = mcs->port->serial->dev;
 492         struct usb_ctrlrequest *dr = mcs->dr;
 493         unsigned char *buffer = mcs->ctrl_buf;
 494         int ret;
 495
 496         if (test_and_set_bit_lock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags))
 497                 return -EBUSY;
 498
 499         dr->bRequestType = MCS_RD_RTYPE;
 500         dr->bRequest = MCS_RDREQ;
 501         dr->wValue = cpu_to_le16(Wval); /* 0 */
 502         dr->wIndex = cpu_to_le16(reg);
 503         dr->wLength = cpu_to_le16(2);
 504
 505         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 506                              (unsigned char *)dr, buffer, 2,
 507                              mos7840_control_callback, mcs);
 508         mcs->control_urb->transfer_buffer_length = 2;
 509         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 510         if (ret)
 511                 clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags);
 512
 513         return ret;
 514 }
 515
 516 static void mos7840_set_led_callback(struct urb *urb)
 517 {
 518         switch (urb->status) {
 519         case 0:
 520                 /* Success */
 521                 break;
 522         case -ECONNRESET:
 523         case -ENOENT:
 524         case -ESHUTDOWN:
 525                 /* This urb is terminated, clean up */
 526                 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d",
 527                         __func__, urb->status);
 528                 break;
 529         default:
 530                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d",
 531                         __func__, urb->status);
 532         }
 533 }
 534
 535 static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
 536                                 __u16 reg)
 537 {
 538         struct usb_device *dev = mcs->port->serial->dev;
 539         struct usb_ctrlrequest *dr = mcs->led_dr;
 540
 541         dr->bRequestType = MCS_WR_RTYPE;
 542         dr->bRequest = MCS_WRREQ;
 543         dr->wValue = cpu_to_le16(wval);
 544         dr->wIndex = cpu_to_le16(reg);
 545         dr->wLength = cpu_to_le16(0);
 546
 547         usb_fill_control_urb(mcs->led_urb, dev, usb_sndctrlpipe(dev, 0),
 548                 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
 549
 550         usb_submit_urb(mcs->led_urb, GFP_ATOMIC);
 551 }
 552
 553 static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
 554                                 __u16 val)
 555 {
 556         struct usb_device *dev = port->serial->dev;
 557
 558         usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
 559                         val, reg, NULL, 0, MOS_WDR_TIMEOUT);
 560 }
 561
 562 static void mos7840_led_off(unsigned long arg)
 563 {
 564         struct moschip_port *mcs = (struct moschip_port *) arg;
 565
 566         /* Turn off LED */
 567         mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
 568         mod_timer(&mcs->led_timer2,
 569                                 jiffies + msecs_to_jiffies(LED_OFF_MS));
 570 }
 571
 572 static void mos7840_led_flag_off(unsigned long arg)
 573 {
 574         struct moschip_port *mcs = (struct moschip_port *) arg;
 575
 576         clear_bit_unlock(MOS7840_FLAG_LED_BUSY, &mcs->flags);
 577 }
 578
 579 static void mos7840_led_activity(struct usb_serial_port *port)
 580 {
 581         struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
 582
 583         if (test_and_set_bit_lock(MOS7840_FLAG_LED_BUSY, &mos7840_port->flags))
 584                 return;
 585
 586         mos7840_set_led_async(mos7840_port, 0x0301, MODEM_CONTROL_REGISTER);
 587         mod_timer(&mos7840_port->led_timer1,
 588                                 jiffies + msecs_to_jiffies(LED_ON_MS));
 589 }
 590
 591 /*****************************************************************************
 592  * mos7840_interrupt_callback
 593  *      this is the callback function for when we have received data on the
 594  *      interrupt endpoint.
 595  *****************************************************************************/
 596
 597 static void mos7840_interrupt_callback(struct urb *urb)
 598 {
 599         int result;
 600         int length;
 601         struct moschip_port *mos7840_port;
 602         struct usb_serial *serial;
 603         __u16 Data;
 604         unsigned char *data;
 605         __u8 sp[5], st;
 606         int i, rv = 0;
 607         __u16 wval, wreg = 0;
 608         int status = urb->status;
 609
 610         switch (status) {
 611         case 0:
 612                 /* success */
 613                 break;
 614         case -ECONNRESET:
 615         case -ENOENT:
 616         case -ESHUTDOWN:
 617                 /* this urb is terminated, clean up */
 618                 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
 619                         __func__, status);
 620                 return;
 621         default:
 622                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
 623                         __func__, status);
 624                 goto exit;
 625         }
 626
 627         length = urb->actual_length;
 628         data = urb->transfer_buffer;
 629
 630         serial = urb->context;
 631
 632         /* Moschip get 5 bytes
 633          * Byte 1 IIR Port 1 (port.number is 0)
 634          * Byte 2 IIR Port 2 (port.number is 1)
 635          * Byte 3 IIR Port 3 (port.number is 2)
 636          * Byte 4 IIR Port 4 (port.number is 3)
 637          * Byte 5 FIFO status for both */
 638
 639         if (length && length > 5) {
 640                 dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n");
 641                 return;
 642         }
 643
 644         sp[0] = (__u8) data[0];
 645         sp[1] = (__u8) data[1];
 646         sp[2] = (__u8) data[2];
 647         sp[3] = (__u8) data[3];
 648         st = (__u8) data[4];
 649
 650         for (i = 0; i < serial->num_ports; i++) {
 651                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 652                 wval = ((__u16)serial->port[i]->port_number + 1) << 8;
 653                 if (mos7840_port->open) {
 654                         if (sp[i] & 0x01) {
 655                                 dev_dbg(&urb->dev->dev, "SP%d No Interrupt !!!\n", i);
 656                         } else {
 657                                 switch (sp[i] & 0x0f) {
 658                                 case SERIAL_IIR_RLS:
 659                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Receiver status error or \n", i);
 660                                         dev_dbg(&urb->dev->dev, "address bit detected in 9-bit mode\n");
 661                                         mos7840_port->MsrLsr = 1;
 662                                         wreg = LINE_STATUS_REGISTER;
 663                                         break;
 664                                 case SERIAL_IIR_MS:
 665                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Modem status change\n", i);
 666                                         mos7840_port->MsrLsr = 0;
 667                                         wreg = MODEM_STATUS_REGISTER;
 668                                         break;
 669                                 }
 670                                 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 671                         }
 672                 }
 673         }
 674         if (!(rv < 0))
 675                 /* the completion handler for the control urb will resubmit */
 676                 return;
 677 exit:
 678         result = usb_submit_urb(urb, GFP_ATOMIC);
 679         if (result) {
 680                 dev_err(&urb->dev->dev,
 681                         "%s - Error %d submitting interrupt urb\n",
 682                         __func__, result);
 683         }
 684 }
 685
 686 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 687                                        const char *function)
 688 {
 689         if (!port) {
 690                 pr_debug("%s - port == NULL\n", function);
 691                 return -1;
 692         }
 693         if (!port->serial) {
 694                 pr_debug("%s - port->serial == NULL\n", function);
 695                 return -1;
 696         }
 697
 698         return 0;
 699 }
 700
 701 /* Inline functions to check the sanity of a pointer that is passed to us */
 702 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 703                                          const char *function)
 704 {
 705         if (!serial) {
 706                 pr_debug("%s - serial == NULL\n", function);
 707                 return -1;
 708         }
 709         if (!serial->type) {
 710                 pr_debug("%s - serial->type == NULL!\n", function);
 711                 return -1;
 712         }
 713
 714         return 0;
 715 }
 716
 717 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 718                                                  const char *function)
 719 {
 720         /* if no port was specified, or it fails a paranoia check */
 721         if (!port ||
 722             mos7840_port_paranoia_check(port, function) ||
 723             mos7840_serial_paranoia_check(port->serial, function)) {
 724                 /* then say that we don't have a valid usb_serial thing,
 725                  * which will end up genrating -ENODEV return values */
 726                 return NULL;
 727         }
 728
 729         return port->serial;
 730 }
 731
 732 /*****************************************************************************
 733  * mos7840_bulk_in_callback
 734  *      this is the callback function for when we have received data on the
 735  *      bulk in endpoint.
 736  *****************************************************************************/
 737
 738 static void mos7840_bulk_in_callback(struct urb *urb)
 739 {
 740         int retval;
 741         unsigned char *data;
 742         struct usb_serial *serial;
 743         struct usb_serial_port *port;
 744         struct moschip_port *mos7840_port;
 745         int status = urb->status;
 746
 747         mos7840_port = urb->context;
 748         if (!mos7840_port)
 749                 return;
 750
 751         if (status) {
 752                 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
 753                 mos7840_port->read_urb_busy = false;
 754                 return;
 755         }
 756
 757         port = mos7840_port->port;
 758         if (mos7840_port_paranoia_check(port, __func__)) {
 759                 mos7840_port->read_urb_busy = false;
 760                 return;
 761         }
 762
 763         serial = mos7840_get_usb_serial(port, __func__);
 764         if (!serial) {
 765                 mos7840_port->read_urb_busy = false;
 766                 return;
 767         }
 768
 769         data = urb->transfer_buffer;
 770         usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
 771
 772         if (urb->actual_length) {
 773                 struct tty_port *tport = &mos7840_port->port->port;
 774                 tty_insert_flip_string(tport, data, urb->actual_length);
 775                 tty_flip_buffer_push(tport);
 776                 port->icount.rx += urb->actual_length;
 777                 dev_dbg(&port->dev, "icount.rx is %d:\n", port->icount.rx);
 778         }
 779
 780         if (!mos7840_port->read_urb) {
 781                 dev_dbg(&port->dev, "%s", "URB KILLED !!!\n");
 782                 mos7840_port->read_urb_busy = false;
 783                 return;
 784         }
 785
 786         if (mos7840_port->has_led)
 787                 mos7840_led_activity(port);
 788
 789         mos7840_port->read_urb_busy = true;
 790         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 791
 792         if (retval) {
 793                 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
 794                 mos7840_port->read_urb_busy = false;
 795         }
 796 }
 797
 798 /*****************************************************************************
 799  * mos7840_bulk_out_data_callback
 800  *      this is the callback function for when we have finished sending
 801  *      serial data on the bulk out endpoint.
 802  *****************************************************************************/
 803
 804 static void mos7840_bulk_out_data_callback(struct urb *urb)
 805 {
 806         struct moschip_port *mos7840_port;
 807         struct usb_serial_port *port;
 808         int status = urb->status;
 809         int i;
 810
 811         mos7840_port = urb->context;
 812         port = mos7840_port->port;
 813         spin_lock(&mos7840_port->pool_lock);
 814         for (i = 0; i < NUM_URBS; i++) {
 815                 if (urb == mos7840_port->write_urb_pool[i]) {
 816                         mos7840_port->busy[i] = 0;
 817                         break;
 818                 }
 819         }
 820         spin_unlock(&mos7840_port->pool_lock);
 821
 822         if (status) {
 823                 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
 824                 return;
 825         }
 826
 827         if (mos7840_port_paranoia_check(port, __func__))
 828                 return;
 829
 830         if (mos7840_port->open)
 831                 tty_port_tty_wakeup(&port->port);
 832
 833 }
 834
 835 /************************************************************************/
 836 /*       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       */
 837 /************************************************************************/
 838
 839 /*****************************************************************************
 840  * mos7840_open
 841  *      this function is called by the tty driver when a port is opened
 842  *      If successful, we return 0
 843  *      Otherwise we return a negative error number.
 844  *****************************************************************************/
 845
 846 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
 847 {
 848         int response;
 849         int j;
 850         struct usb_serial *serial;
 851         struct urb *urb;
 852         __u16 Data;
 853         int status;
 854         struct moschip_port *mos7840_port;
 855         struct moschip_port *port0;
 856
 857         if (mos7840_port_paranoia_check(port, __func__))
 858                 return -ENODEV;
 859
 860         serial = port->serial;
 861
 862         if (mos7840_serial_paranoia_check(serial, __func__))
 863                 return -ENODEV;
 864
 865         mos7840_port = mos7840_get_port_private(port);
 866         port0 = mos7840_get_port_private(serial->port[0]);
 867
 868         if (mos7840_port == NULL || port0 == NULL)
 869                 return -ENODEV;
 870
 871         usb_clear_halt(serial->dev, port->write_urb->pipe);
 872         usb_clear_halt(serial->dev, port->read_urb->pipe);
 873         port0->open_ports++;
 874
 875         /* Initialising the write urb pool */
 876         for (j = 0; j < NUM_URBS; ++j) {
 877                 urb = usb_alloc_urb(0, GFP_KERNEL);
 878                 mos7840_port->write_urb_pool[j] = urb;
 879
 880                 if (urb == NULL) {
 881                         dev_err(&port->dev, "No more urbs???\n");
 882                         continue;
 883                 }
 884
 885                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 886                                                                 GFP_KERNEL);
 887                 if (!urb->transfer_buffer) {
 888                         usb_free_urb(urb);
 889                         mos7840_port->write_urb_pool[j] = NULL;
 890                         dev_err(&port->dev,
 891                                 "%s-out of memory for urb buffers.\n",
 892                                 __func__);
 893                         continue;
 894                 }
 895         }
 896
 897 /*****************************************************************************
 898  * Initialize MCS7840 -- Write Init values to corresponding Registers
 899  *
 900  * Register Index
 901  * 1 : IER
 902  * 2 : FCR
 903  * 3 : LCR
 904  * 4 : MCR
 905  *
 906  * 0x08 : SP1/2 Control Reg
 907  *****************************************************************************/
 908
 909         /* NEED to check the following Block */
 910
 911         Data = 0x0;
 912         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 913         if (status < 0) {
 914                 dev_dbg(&port->dev, "Reading Spreg failed\n");
 915                 goto err;
 916         }
 917         Data |= 0x80;
 918         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 919         if (status < 0) {
 920                 dev_dbg(&port->dev, "writing Spreg failed\n");
 921                 goto err;
 922         }
 923
 924         Data &= ~0x80;
 925         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 926         if (status < 0) {
 927                 dev_dbg(&port->dev, "writing Spreg failed\n");
 928                 goto err;
 929         }
 930         /* End of block to be checked */
 931
 932         Data = 0x0;
 933         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 934                                                                         &Data);
 935         if (status < 0) {
 936                 dev_dbg(&port->dev, "Reading Controlreg failed\n");
 937                 goto err;
 938         }
 939         Data |= 0x08;           /* Driver done bit */
 940         Data |= 0x20;           /* rx_disable */
 941         status = mos7840_set_reg_sync(port,
 942                                 mos7840_port->ControlRegOffset, Data);
 943         if (status < 0) {
 944                 dev_dbg(&port->dev, "writing Controlreg failed\n");
 945                 goto err;
 946         }
 947         /* do register settings here */
 948         /* Set all regs to the device default values. */
 949         /***********************************
 950          * First Disable all interrupts.
 951          ***********************************/
 952         Data = 0x00;
 953         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 954         if (status < 0) {
 955                 dev_dbg(&port->dev, "disabling interrupts failed\n");
 956                 goto err;
 957         }
 958         /* Set FIFO_CONTROL_REGISTER to the default value */
 959         Data = 0x00;
 960         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 961         if (status < 0) {
 962                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
 963                 goto err;
 964         }
 965
 966         Data = 0xcf;
 967         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 968         if (status < 0) {
 969                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
 970                 goto err;
 971         }
 972
 973         Data = 0x03;
 974         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 975         mos7840_port->shadowLCR = Data;
 976
 977         Data = 0x0b;
 978         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
 979         mos7840_port->shadowMCR = Data;
 980
 981         Data = 0x00;
 982         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 983         mos7840_port->shadowLCR = Data;
 984
 985         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
 986         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 987
 988         Data = 0x0c;
 989         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
 990
 991         Data = 0x0;
 992         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
 993
 994         Data = 0x00;
 995         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 996
 997         Data = Data & ~SERIAL_LCR_DLAB;
 998         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 999         mos7840_port->shadowLCR = Data;
1000
1001         /* clearing Bulkin and Bulkout Fifo */
1002         Data = 0x0;
1003         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1004
1005         Data = Data | 0x0c;
1006         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1007
1008         Data = Data & ~0x0c;
1009         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1010         /* Finally enable all interrupts */
1011         Data = 0x0c;
1012         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1013
1014         /* clearing rx_disable */
1015         Data = 0x0;
1016         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1017                                                                         &Data);
1018         Data = Data & ~0x20;
1019         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1020                                                                         Data);
1021
1022         /* rx_negate */
1023         Data = 0x0;
1024         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1025                                                                         &Data);
1026         Data = Data | 0x10;
1027         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1028                                                                         Data);
1029
1030         /* Check to see if we've set up our endpoint info yet    *
1031          * (can't set it up in mos7840_startup as the structures *
1032          * were not set up at that time.)                        */
1033         if (port0->open_ports == 1) {
1034                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1035                         /* set up interrupt urb */
1036                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1037                                 serial->dev,
1038                                 usb_rcvintpipe(serial->dev,
1039                                 serial->port[0]->interrupt_in_endpointAddress),
1040                                 serial->port[0]->interrupt_in_buffer,
1041                                 serial->port[0]->interrupt_in_urb->
1042                                 transfer_buffer_length,
1043                                 mos7840_interrupt_callback,
1044                                 serial,
1045                                 serial->port[0]->interrupt_in_urb->interval);
1046
1047                         /* start interrupt read for mos7840               *
1048                          * will continue as long as mos7840 is connected  */
1049
1050                         response =
1051                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1052                                            GFP_KERNEL);
1053                         if (response) {
1054                                 dev_err(&port->dev, "%s - Error %d submitting "
1055                                         "interrupt urb\n", __func__, response);
1056                         }
1057
1058                 }
1059
1060         }
1061
1062         /* see if we've set up our endpoint info yet   *
1063          * (can't set it up in mos7840_startup as the  *
1064          * structures were not set up at that time.)   */
1065
1066         dev_dbg(&port->dev, "port number is %d\n", port->port_number);
1067         dev_dbg(&port->dev, "minor number is %d\n", port->minor);
1068         dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
1069         dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
1070         dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
1071         dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
1072         mos7840_port->read_urb = port->read_urb;
1073
1074         /* set up our bulk in urb */
1075         if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1076                 usb_fill_bulk_urb(mos7840_port->read_urb,
1077                         serial->dev,
1078                         usb_rcvbulkpipe(serial->dev,
1079                                 (port->bulk_in_endpointAddress) + 2),
1080                         port->bulk_in_buffer,
1081                         mos7840_port->read_urb->transfer_buffer_length,
1082                         mos7840_bulk_in_callback, mos7840_port);
1083         } else {
1084                 usb_fill_bulk_urb(mos7840_port->read_urb,
1085                         serial->dev,
1086                         usb_rcvbulkpipe(serial->dev,
1087                                 port->bulk_in_endpointAddress),
1088                         port->bulk_in_buffer,
1089                         mos7840_port->read_urb->transfer_buffer_length,
1090                         mos7840_bulk_in_callback, mos7840_port);
1091         }
1092
1093         dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
1094         mos7840_port->read_urb_busy = true;
1095         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1096         if (response) {
1097                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1098                         __func__, response);
1099                 mos7840_port->read_urb_busy = false;
1100         }
1101
1102         /* initialize our port settings */
1103         /* Must set to enable ints! */
1104         mos7840_port->shadowMCR = MCR_MASTER_IE;
1105         /* send a open port command */
1106         mos7840_port->open = 1;
1107         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1108
1109         return 0;
1110 err:
1111         for (j = 0; j < NUM_URBS; ++j) {
1112                 urb = mos7840_port->write_urb_pool[j];
1113                 if (!urb)
1114                         continue;
1115                 kfree(urb->transfer_buffer);
1116                 usb_free_urb(urb);
1117         }
1118         return status;
1119 }
1120
1121 /*****************************************************************************
1122  * mos7840_chars_in_buffer
1123  *      this function is called by the tty driver when it wants to know how many
1124  *      bytes of data we currently have outstanding in the port (data that has
1125  *      been written, but hasn't made it out the port yet)
1126  *      If successful, we return the number of bytes left to be written in the
1127  *      system,
1128  *      Otherwise we return zero.
1129  *****************************************************************************/
1130
1131 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1132 {
1133         struct usb_serial_port *port = tty->driver_data;
1134         int i;
1135         int chars = 0;
1136         unsigned long flags;
1137         struct moschip_port *mos7840_port;
1138
1139         if (mos7840_port_paranoia_check(port, __func__))
1140                 return 0;
1141
1142         mos7840_port = mos7840_get_port_private(port);
1143         if (mos7840_port == NULL)
1144                 return 0;
1145
1146         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1147         for (i = 0; i < NUM_URBS; ++i) {
1148                 if (mos7840_port->busy[i]) {
1149                         struct urb *urb = mos7840_port->write_urb_pool[i];
1150                         chars += urb->transfer_buffer_length;
1151                 }
1152         }
1153         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1154         dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1155         return chars;
1156
1157 }
1158
1159 /*****************************************************************************
1160  * mos7840_close
1161  *      this function is called by the tty driver when a port is closed
1162  *****************************************************************************/
1163
1164 static void mos7840_close(struct usb_serial_port *port)
1165 {
1166         struct usb_serial *serial;
1167         struct moschip_port *mos7840_port;
1168         struct moschip_port *port0;
1169         int j;
1170         __u16 Data;
1171
1172         if (mos7840_port_paranoia_check(port, __func__))
1173                 return;
1174
1175         serial = mos7840_get_usb_serial(port, __func__);
1176         if (!serial)
1177                 return;
1178
1179         mos7840_port = mos7840_get_port_private(port);
1180         port0 = mos7840_get_port_private(serial->port[0]);
1181
1182         if (mos7840_port == NULL || port0 == NULL)
1183                 return;
1184
1185         for (j = 0; j < NUM_URBS; ++j)
1186                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1187
1188         /* Freeing Write URBs */
1189         for (j = 0; j < NUM_URBS; ++j) {
1190                 if (mos7840_port->write_urb_pool[j]) {
1191                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1192                                 kfree(mos7840_port->write_urb_pool[j]->
1193                                       transfer_buffer);
1194
1195                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1196                 }
1197         }
1198
1199         usb_kill_urb(mos7840_port->write_urb);
1200         usb_kill_urb(mos7840_port->read_urb);
1201         mos7840_port->read_urb_busy = false;
1202
1203         port0->open_ports--;
1204         dev_dbg(&port->dev, "%s in close%d\n", __func__, port0->open_ports);
1205         if (port0->open_ports == 0) {
1206                 if (serial->port[0]->interrupt_in_urb) {
1207                         dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n");
1208                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1209                 }
1210         }
1211
1212         if (mos7840_port->write_urb) {
1213                 /* if this urb had a transfer buffer already (old tx) free it */
1214                 kfree(mos7840_port->write_urb->transfer_buffer);
1215                 usb_free_urb(mos7840_port->write_urb);
1216         }
1217
1218         Data = 0x0;
1219         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1220
1221         Data = 0x00;
1222         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1223
1224         mos7840_port->open = 0;
1225 }
1226
1227 /*****************************************************************************
1228  * mos7840_break
1229  *      this function sends a break to the port
1230  *****************************************************************************/
1231 static void mos7840_break(struct tty_struct *tty, int break_state)
1232 {
1233         struct usb_serial_port *port = tty->driver_data;
1234         unsigned char data;
1235         struct usb_serial *serial;
1236         struct moschip_port *mos7840_port;
1237
1238         if (mos7840_port_paranoia_check(port, __func__))
1239                 return;
1240
1241         serial = mos7840_get_usb_serial(port, __func__);
1242         if (!serial)
1243                 return;
1244
1245         mos7840_port = mos7840_get_port_private(port);
1246
1247         if (mos7840_port == NULL)
1248                 return;
1249
1250         if (break_state == -1)
1251                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1252         else
1253                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1254
1255         /* FIXME: no locking on shadowLCR anywhere in driver */
1256         mos7840_port->shadowLCR = data;
1257         dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1258         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1259                              mos7840_port->shadowLCR);
1260 }
1261
1262 /*****************************************************************************
1263  * mos7840_write_room
1264  *      this function is called by the tty driver when it wants to know how many
1265  *      bytes of data we can accept for a specific port.
1266  *      If successful, we return the amount of room that we have for this port
1267  *      Otherwise we return a negative error number.
1268  *****************************************************************************/
1269
1270 static int mos7840_write_room(struct tty_struct *tty)
1271 {
1272         struct usb_serial_port *port = tty->driver_data;
1273         int i;
1274         int room = 0;
1275         unsigned long flags;
1276         struct moschip_port *mos7840_port;
1277
1278         if (mos7840_port_paranoia_check(port, __func__))
1279                 return -1;
1280
1281         mos7840_port = mos7840_get_port_private(port);
1282         if (mos7840_port == NULL)
1283                 return -1;
1284
1285         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1286         for (i = 0; i < NUM_URBS; ++i) {
1287                 if (!mos7840_port->busy[i])
1288                         room += URB_TRANSFER_BUFFER_SIZE;
1289         }
1290         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1291
1292         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1293         dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room);
1294         return room;
1295
1296 }
1297
1298 /*****************************************************************************
1299  * mos7840_write
1300  *      this function is called by the tty driver when data should be written to
1301  *      the port.
1302  *      If successful, we return the number of bytes written, otherwise we
1303  *      return a negative error number.
1304  *****************************************************************************/
1305
1306 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1307                          const unsigned char *data, int count)
1308 {
1309         int status;
1310         int i;
1311         int bytes_sent = 0;
1312         int transfer_size;
1313         unsigned long flags;
1314
1315         struct moschip_port *mos7840_port;
1316         struct usb_serial *serial;
1317         struct urb *urb;
1318         /* __u16 Data; */
1319         const unsigned char *current_position = data;
1320         unsigned char *data1;
1321
1322 #ifdef NOTMOS7840
1323         Data = 0x00;
1324         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1325         mos7840_port->shadowLCR = Data;
1326         dev_dbg(&port->dev, "%s: LINE_CONTROL_REGISTER is %x\n", __func__, Data);
1327         dev_dbg(&port->dev, "%s: mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1328
1329         /* Data = 0x03; */
1330         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1331         /* mos7840_port->shadowLCR=Data;//Need to add later */
1332
1333         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1334         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1335
1336         /* Data = 0x0c; */
1337         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1338         Data = 0x00;
1339         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1340         dev_dbg(&port->dev, "%s: DLL value is %x\n", __func__, Data);
1341
1342         Data = 0x0;
1343         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1344         dev_dbg(&port->dev, "%s: DLM value is %x\n", __func__, Data);
1345
1346         Data = Data & ~SERIAL_LCR_DLAB;
1347         dev_dbg(&port->dev, "%s: mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1348         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1349 #endif
1350
1351         if (mos7840_port_paranoia_check(port, __func__))
1352                 return -1;
1353
1354         serial = port->serial;
1355         if (mos7840_serial_paranoia_check(serial, __func__))
1356                 return -1;
1357
1358         mos7840_port = mos7840_get_port_private(port);
1359         if (mos7840_port == NULL)
1360                 return -1;
1361
1362         /* try to find a free urb in the list */
1363         urb = NULL;
1364
1365         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1366         for (i = 0; i < NUM_URBS; ++i) {
1367                 if (!mos7840_port->busy[i]) {
1368                         mos7840_port->busy[i] = 1;
1369                         urb = mos7840_port->write_urb_pool[i];
1370                         dev_dbg(&port->dev, "URB:%d\n", i);
1371                         break;
1372                 }
1373         }
1374         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1375
1376         if (urb == NULL) {
1377                 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1378                 goto exit;
1379         }
1380
1381         if (urb->transfer_buffer == NULL) {
1382                 urb->transfer_buffer =
1383                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1384
1385                 if (urb->transfer_buffer == NULL) {
1386                         dev_err_console(port, "%s no more kernel memory...\n",
1387                                 __func__);
1388                         goto exit;
1389                 }
1390         }
1391         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1392
1393         memcpy(urb->transfer_buffer, current_position, transfer_size);
1394
1395         /* fill urb with data and submit  */
1396         if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1397                 usb_fill_bulk_urb(urb,
1398                         serial->dev,
1399                         usb_sndbulkpipe(serial->dev,
1400                                 (port->bulk_out_endpointAddress) + 2),
1401                         urb->transfer_buffer,
1402                         transfer_size,
1403                         mos7840_bulk_out_data_callback, mos7840_port);
1404         } else {
1405                 usb_fill_bulk_urb(urb,
1406                         serial->dev,
1407                         usb_sndbulkpipe(serial->dev,
1408                                 port->bulk_out_endpointAddress),
1409                         urb->transfer_buffer,
1410                         transfer_size,
1411                         mos7840_bulk_out_data_callback, mos7840_port);
1412         }
1413
1414         data1 = urb->transfer_buffer;
1415         dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
1416
1417         if (mos7840_port->has_led)
1418                 mos7840_led_activity(port);
1419
1420         /* send it down the pipe */
1421         status = usb_submit_urb(urb, GFP_ATOMIC);
1422
1423         if (status) {
1424                 mos7840_port->busy[i] = 0;
1425                 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1426                         "with status = %d\n", __func__, status);
1427                 bytes_sent = status;
1428                 goto exit;
1429         }
1430         bytes_sent = transfer_size;
1431         port->icount.tx += transfer_size;
1432         dev_dbg(&port->dev, "icount.tx is %d:\n", port->icount.tx);
1433 exit:
1434         return bytes_sent;
1435
1436 }
1437
1438 /*****************************************************************************
1439  * mos7840_throttle
1440  *      this function is called by the tty driver when it wants to stop the data
1441  *      being read from the port.
1442  *****************************************************************************/
1443
1444 static void mos7840_throttle(struct tty_struct *tty)
1445 {
1446         struct usb_serial_port *port = tty->driver_data;
1447         struct moschip_port *mos7840_port;
1448         int status;
1449
1450         if (mos7840_port_paranoia_check(port, __func__))
1451                 return;
1452
1453         mos7840_port = mos7840_get_port_private(port);
1454
1455         if (mos7840_port == NULL)
1456                 return;
1457
1458         if (!mos7840_port->open) {
1459                 dev_dbg(&port->dev, "%s", "port not opened\n");
1460                 return;
1461         }
1462
1463         /* if we are implementing XON/XOFF, send the stop character */
1464         if (I_IXOFF(tty)) {
1465                 unsigned char stop_char = STOP_CHAR(tty);
1466                 status = mos7840_write(tty, port, &stop_char, 1);
1467                 if (status <= 0)
1468                         return;
1469         }
1470         /* if we are implementing RTS/CTS, toggle that line */
1471         if (tty->termios.c_cflag & CRTSCTS) {
1472                 mos7840_port->shadowMCR &= ~MCR_RTS;
1473                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1474                                          mos7840_port->shadowMCR);
1475                 if (status < 0)
1476                         return;
1477         }
1478 }
1479
1480 /*****************************************************************************
1481  * mos7840_unthrottle
1482  *      this function is called by the tty driver when it wants to resume
1483  *      the data being read from the port (called after mos7840_throttle is
1484  *      called)
1485  *****************************************************************************/
1486 static void mos7840_unthrottle(struct tty_struct *tty)
1487 {
1488         struct usb_serial_port *port = tty->driver_data;
1489         int status;
1490         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1491
1492         if (mos7840_port_paranoia_check(port, __func__))
1493                 return;
1494
1495         if (mos7840_port == NULL)
1496                 return;
1497
1498         if (!mos7840_port->open) {
1499                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1500                 return;
1501         }
1502
1503         /* if we are implementing XON/XOFF, send the start character */
1504         if (I_IXOFF(tty)) {
1505                 unsigned char start_char = START_CHAR(tty);
1506                 status = mos7840_write(tty, port, &start_char, 1);
1507                 if (status <= 0)
1508                         return;
1509         }
1510
1511         /* if we are implementing RTS/CTS, toggle that line */
1512         if (tty->termios.c_cflag & CRTSCTS) {
1513                 mos7840_port->shadowMCR |= MCR_RTS;
1514                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1515                                          mos7840_port->shadowMCR);
1516                 if (status < 0)
1517                         return;
1518         }
1519 }
1520
1521 static int mos7840_tiocmget(struct tty_struct *tty)
1522 {
1523         struct usb_serial_port *port = tty->driver_data;
1524         struct moschip_port *mos7840_port;
1525         unsigned int result;
1526         __u16 msr;
1527         __u16 mcr;
1528         int status;
1529         mos7840_port = mos7840_get_port_private(port);
1530
1531         if (mos7840_port == NULL)
1532                 return -ENODEV;
1533
1534         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1535         if (status != 1)
1536                 return -EIO;
1537         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1538         if (status != 1)
1539                 return -EIO;
1540         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1541             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1542             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1543             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1544             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1545             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1546             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1547
1548         dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1549
1550         return result;
1551 }
1552
1553 static int mos7840_tiocmset(struct tty_struct *tty,
1554                             unsigned int set, unsigned int clear)
1555 {
1556         struct usb_serial_port *port = tty->driver_data;
1557         struct moschip_port *mos7840_port;
1558         unsigned int mcr;
1559         int status;
1560
1561         mos7840_port = mos7840_get_port_private(port);
1562
1563         if (mos7840_port == NULL)
1564                 return -ENODEV;
1565
1566         /* FIXME: What locks the port registers ? */
1567         mcr = mos7840_port->shadowMCR;
1568         if (clear & TIOCM_RTS)
1569                 mcr &= ~MCR_RTS;
1570         if (clear & TIOCM_DTR)
1571                 mcr &= ~MCR_DTR;
1572         if (clear & TIOCM_LOOP)
1573                 mcr &= ~MCR_LOOPBACK;
1574
1575         if (set & TIOCM_RTS)
1576                 mcr |= MCR_RTS;
1577         if (set & TIOCM_DTR)
1578                 mcr |= MCR_DTR;
1579         if (set & TIOCM_LOOP)
1580                 mcr |= MCR_LOOPBACK;
1581
1582         mos7840_port->shadowMCR = mcr;
1583
1584         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1585         if (status < 0) {
1586                 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1587                 return status;
1588         }
1589
1590         return 0;
1591 }
1592
1593 /*****************************************************************************
1594  * mos7840_calc_baud_rate_divisor
1595  *      this function calculates the proper baud rate divisor for the specified
1596  *      baud rate.
1597  *****************************************************************************/
1598 static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1599                                           int baudRate, int *divisor,
1600                                           __u16 *clk_sel_val)
1601 {
1602         dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1603
1604         if (baudRate <= 115200) {
1605                 *divisor = 115200 / baudRate;
1606                 *clk_sel_val = 0x0;
1607         }
1608         if ((baudRate > 115200) && (baudRate <= 230400)) {
1609                 *divisor = 230400 / baudRate;
1610                 *clk_sel_val = 0x10;
1611         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1612                 *divisor = 403200 / baudRate;
1613                 *clk_sel_val = 0x20;
1614         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1615                 *divisor = 460800 / baudRate;
1616                 *clk_sel_val = 0x30;
1617         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1618                 *divisor = 806400 / baudRate;
1619                 *clk_sel_val = 0x40;
1620         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1621                 *divisor = 921600 / baudRate;
1622                 *clk_sel_val = 0x50;
1623         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1624                 *divisor = 1572864 / baudRate;
1625                 *clk_sel_val = 0x60;
1626         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1627                 *divisor = 3145728 / baudRate;
1628                 *clk_sel_val = 0x70;
1629         }
1630         return 0;
1631
1632 #ifdef NOTMCS7840
1633
1634         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1635                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1636                         *divisor = mos7840_divisor_table[i].Divisor;
1637                         return 0;
1638                 }
1639         }
1640
1641         /* After trying for all the standard baud rates    *
1642          * Try calculating the divisor for this baud rate  */
1643
1644         if (baudrate > 75 && baudrate < 230400) {
1645                 /* get the divisor */
1646                 custom = (__u16) (230400L / baudrate);
1647
1648                 /* Check for round off */
1649                 round1 = (__u16) (2304000L / baudrate);
1650                 round = (__u16) (round1 - (custom * 10));
1651                 if (round > 4)
1652                         custom++;
1653                 *divisor = custom;
1654
1655                 dev_dbg(&port->dev, " Baud %d = %d\n", baudrate, custom);
1656                 return 0;
1657         }
1658
1659         dev_dbg(&port->dev, "%s", " Baud calculation Failed...\n");
1660         return -1;
1661 #endif
1662 }
1663
1664 /*****************************************************************************
1665  * mos7840_send_cmd_write_baud_rate
1666  *      this function sends the proper command to change the baud rate of the
1667  *      specified port.
1668  *****************************************************************************/
1669
1670 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1671                                             int baudRate)
1672 {
1673         int divisor = 0;
1674         int status;
1675         __u16 Data;
1676         unsigned char number;
1677         __u16 clk_sel_val;
1678         struct usb_serial_port *port;
1679
1680         if (mos7840_port == NULL)
1681                 return -1;
1682
1683         port = mos7840_port->port;
1684         if (mos7840_port_paranoia_check(port, __func__))
1685                 return -1;
1686
1687         if (mos7840_serial_paranoia_check(port->serial, __func__))
1688                 return -1;
1689
1690         number = mos7840_port->port->port_number;
1691
1692         dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudRate);
1693         /* reset clk_uart_sel in spregOffset */
1694         if (baudRate > 115200) {
1695 #ifdef HW_flow_control
1696                 /* NOTE: need to see the pther register to modify */
1697                 /* setting h/w flow control bit to 1 */
1698                 Data = 0x2b;
1699                 mos7840_port->shadowMCR = Data;
1700                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1701                                                                         Data);
1702                 if (status < 0) {
1703                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1704                         return -1;
1705                 }
1706 #endif
1707
1708         } else {
1709 #ifdef HW_flow_control
1710                 /* setting h/w flow control bit to 0 */
1711                 Data = 0xb;
1712                 mos7840_port->shadowMCR = Data;
1713                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1714                                                                         Data);
1715                 if (status < 0) {
1716                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1717                         return -1;
1718                 }
1719 #endif
1720
1721         }
1722
1723         if (1) {                /* baudRate <= 115200) */
1724                 clk_sel_val = 0x0;
1725                 Data = 0x0;
1726                 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1727                                                    &clk_sel_val);
1728                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1729                                                                  &Data);
1730                 if (status < 0) {
1731                         dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1732                         return -1;
1733                 }
1734                 Data = (Data & 0x8f) | clk_sel_val;
1735                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1736                                                                 Data);
1737                 if (status < 0) {
1738                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1739                         return -1;
1740                 }
1741                 /* Calculate the Divisor */
1742
1743                 if (status) {
1744                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1745                         return status;
1746                 }
1747                 /* Enable access to divisor latch */
1748                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1749                 mos7840_port->shadowLCR = Data;
1750                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1751
1752                 /* Write the divisor */
1753                 Data = (unsigned char)(divisor & 0xff);
1754                 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1755                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1756
1757                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1758                 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1759                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1760
1761                 /* Disable access to divisor latch */
1762                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1763                 mos7840_port->shadowLCR = Data;
1764                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1765
1766         }
1767         return status;
1768 }
1769
1770 /*****************************************************************************
1771  * mos7840_change_port_settings
1772  *      This routine is called to set the UART on the device to match
1773  *      the specified new settings.
1774  *****************************************************************************/
1775
1776 static void mos7840_change_port_settings(struct tty_struct *tty,
1777         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1778 {
1779         int baud;
1780         unsigned cflag;
1781         unsigned iflag;
1782         __u8 lData;
1783         __u8 lParity;
1784         __u8 lStop;
1785         int status;
1786         __u16 Data;
1787         struct usb_serial_port *port;
1788         struct usb_serial *serial;
1789
1790         if (mos7840_port == NULL)
1791                 return;
1792
1793         port = mos7840_port->port;
1794
1795         if (mos7840_port_paranoia_check(port, __func__))
1796                 return;
1797
1798         if (mos7840_serial_paranoia_check(port->serial, __func__))
1799                 return;
1800
1801         serial = port->serial;
1802
1803         if (!mos7840_port->open) {
1804                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1805                 return;
1806         }
1807
1808         lData = LCR_BITS_8;
1809         lStop = LCR_STOP_1;
1810         lParity = LCR_PAR_NONE;
1811
1812         cflag = tty->termios.c_cflag;
1813         iflag = tty->termios.c_iflag;
1814
1815         /* Change the number of bits */
1816         switch (cflag & CSIZE) {
1817         case CS5:
1818                 lData = LCR_BITS_5;
1819                 break;
1820
1821         case CS6:
1822                 lData = LCR_BITS_6;
1823                 break;
1824
1825         case CS7:
1826                 lData = LCR_BITS_7;
1827                 break;
1828
1829         default:
1830         case CS8:
1831                 lData = LCR_BITS_8;
1832                 break;
1833         }
1834
1835         /* Change the Parity bit */
1836         if (cflag & PARENB) {
1837                 if (cflag & PARODD) {
1838                         lParity = LCR_PAR_ODD;
1839                         dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1840                 } else {
1841                         lParity = LCR_PAR_EVEN;
1842                         dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1843                 }
1844
1845         } else {
1846                 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1847         }
1848
1849         if (cflag & CMSPAR)
1850                 lParity = lParity | 0x20;
1851
1852         /* Change the Stop bit */
1853         if (cflag & CSTOPB) {
1854                 lStop = LCR_STOP_2;
1855                 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1856         } else {
1857                 lStop = LCR_STOP_1;
1858                 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1859         }
1860
1861         /* Update the LCR with the correct value */
1862         mos7840_port->shadowLCR &=
1863             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1864         mos7840_port->shadowLCR |= (lData | lParity | lStop);
1865
1866         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1867                 mos7840_port->shadowLCR);
1868         /* Disable Interrupts */
1869         Data = 0x00;
1870         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1871
1872         Data = 0x00;
1873         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1874
1875         Data = 0xcf;
1876         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1877
1878         /* Send the updated LCR value to the mos7840 */
1879         Data = mos7840_port->shadowLCR;
1880
1881         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1882
1883         Data = 0x00b;
1884         mos7840_port->shadowMCR = Data;
1885         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1886         Data = 0x00b;
1887         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1888
1889         /* set up the MCR register and send it to the mos7840 */
1890
1891         mos7840_port->shadowMCR = MCR_MASTER_IE;
1892         if (cflag & CBAUD)
1893                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1894
1895         if (cflag & CRTSCTS)
1896                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1897         else
1898                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1899
1900         Data = mos7840_port->shadowMCR;
1901         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1902
1903         /* Determine divisor based on baud rate */
1904         baud = tty_get_baud_rate(tty);
1905
1906         if (!baud) {
1907                 /* pick a default, any default... */
1908                 dev_dbg(&port->dev, "%s", "Picked default baud...\n");
1909                 baud = 9600;
1910         }
1911
1912         dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1913         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
1914
1915         /* Enable Interrupts */
1916         Data = 0x0c;
1917         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1918
1919         if (mos7840_port->read_urb_busy == false) {
1920                 mos7840_port->read_urb_busy = true;
1921                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
1922                 if (status) {
1923                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1924                             status);
1925                         mos7840_port->read_urb_busy = false;
1926                 }
1927         }
1928         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
1929                 mos7840_port->shadowLCR);
1930 }
1931
1932 /*****************************************************************************
1933  * mos7840_set_termios
1934  *      this function is called by the tty driver when it wants to change
1935  *      the termios structure
1936  *****************************************************************************/
1937
1938 static void mos7840_set_termios(struct tty_struct *tty,
1939                                 struct usb_serial_port *port,
1940                                 struct ktermios *old_termios)
1941 {
1942         int status;
1943         unsigned int cflag;
1944         struct usb_serial *serial;
1945         struct moschip_port *mos7840_port;
1946
1947         if (mos7840_port_paranoia_check(port, __func__))
1948                 return;
1949
1950         serial = port->serial;
1951
1952         if (mos7840_serial_paranoia_check(serial, __func__))
1953                 return;
1954
1955         mos7840_port = mos7840_get_port_private(port);
1956
1957         if (mos7840_port == NULL)
1958                 return;
1959
1960         if (!mos7840_port->open) {
1961                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1962                 return;
1963         }
1964
1965         dev_dbg(&port->dev, "%s", "setting termios - \n");
1966
1967         cflag = tty->termios.c_cflag;
1968
1969         dev_dbg(&port->dev, "%s - clfag %08x iflag %08x\n", __func__,
1970                 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
1971         dev_dbg(&port->dev, "%s - old clfag %08x old iflag %08x\n", __func__,
1972                 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
1973
1974         /* change the port settings to the new ones specified */
1975
1976         mos7840_change_port_settings(tty, mos7840_port, old_termios);
1977
1978         if (!mos7840_port->read_urb) {
1979                 dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n");
1980                 return;
1981         }
1982
1983         if (mos7840_port->read_urb_busy == false) {
1984                 mos7840_port->read_urb_busy = true;
1985                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
1986                 if (status) {
1987                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1988                             status);
1989                         mos7840_port->read_urb_busy = false;
1990                 }
1991         }
1992 }
1993
1994 /*****************************************************************************
1995  * mos7840_get_lsr_info - get line status register info
1996  *
1997  * Purpose: Let user call ioctl() to get info when the UART physically
1998  *          is emptied.  On bus types like RS485, the transmitter must
1999  *          release the bus after transmitting. This must be done when
2000  *          the transmit shift register is empty, not be done when the
2001  *          transmit holding register is empty.  This functionality
2002  *          allows an RS485 driver to be written in user space.
2003  *****************************************************************************/
2004
2005 static int mos7840_get_lsr_info(struct tty_struct *tty,
2006                                 unsigned int __user *value)
2007 {
2008         int count;
2009         unsigned int result = 0;
2010
2011         count = mos7840_chars_in_buffer(tty);
2012         if (count == 0)
2013                 result = TIOCSER_TEMT;
2014
2015         if (copy_to_user(value, &result, sizeof(int)))
2016                 return -EFAULT;
2017         return 0;
2018 }
2019
2020 /*****************************************************************************
2021  * mos7840_get_serial_info
2022  *      function to get information about serial port
2023  *****************************************************************************/
2024
2025 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2026                                    struct serial_struct __user *retinfo)
2027 {
2028         struct serial_struct tmp;
2029
2030         if (mos7840_port == NULL)
2031                 return -1;
2032
2033         if (!retinfo)
2034                 return -EFAULT;
2035
2036         memset(&tmp, 0, sizeof(tmp));
2037
2038         tmp.type = PORT_16550A;
2039         tmp.line = mos7840_port->port->minor;
2040         tmp.port = mos7840_port->port->port_number;
2041         tmp.irq = 0;
2042         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2043         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2044         tmp.baud_base = 9600;
2045         tmp.close_delay = 5 * HZ;
2046         tmp.closing_wait = 30 * HZ;
2047
2048         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2049                 return -EFAULT;
2050         return 0;
2051 }
2052
2053 /*****************************************************************************
2054  * SerialIoctl
2055  *      this function handles any ioctl calls to the driver
2056  *****************************************************************************/
2057
2058 static int mos7840_ioctl(struct tty_struct *tty,
2059                          unsigned int cmd, unsigned long arg)
2060 {
2061         struct usb_serial_port *port = tty->driver_data;
2062         void __user *argp = (void __user *)arg;
2063         struct moschip_port *mos7840_port;
2064
2065         if (mos7840_port_paranoia_check(port, __func__))
2066                 return -1;
2067
2068         mos7840_port = mos7840_get_port_private(port);
2069
2070         if (mos7840_port == NULL)
2071                 return -1;
2072
2073         dev_dbg(&port->dev, "%s - cmd = 0x%x\n", __func__, cmd);
2074
2075         switch (cmd) {
2076                 /* return number of bytes available */
2077
2078         case TIOCSERGETLSR:
2079                 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
2080                 return mos7840_get_lsr_info(tty, argp);
2081
2082         case TIOCGSERIAL:
2083                 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
2084                 return mos7840_get_serial_info(mos7840_port, argp);
2085
2086         case TIOCSSERIAL:
2087                 dev_dbg(&port->dev, "%s TIOCSSERIAL\n", __func__);
2088                 break;
2089         default:
2090                 break;
2091         }
2092         return -ENOIOCTLCMD;
2093 }
2094
2095 static int mos7810_check(struct usb_serial *serial)
2096 {
2097         int i, pass_count = 0;
2098         u8 *buf;
2099         __u16 data = 0, mcr_data = 0;
2100         __u16 test_pattern = 0x55AA;
2101         int res;
2102
2103         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2104         if (!buf)
2105                 return 0;       /* failed to identify 7810 */
2106
2107         /* Store MCR setting */
2108         res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2109                 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
2110                 buf, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2111         if (res == VENDOR_READ_LENGTH)
2112                 mcr_data = *buf;
2113
2114         for (i = 0; i < 16; i++) {
2115                 /* Send the 1-bit test pattern out to MCS7810 test pin */
2116                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2117                         MCS_WRREQ, MCS_WR_RTYPE,
2118                         (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
2119                         MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
2120
2121                 /* Read the test pattern back */
2122                 res = usb_control_msg(serial->dev,
2123                                 usb_rcvctrlpipe(serial->dev, 0), MCS_RDREQ,
2124                                 MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2125                                 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2126                 if (res == VENDOR_READ_LENGTH)
2127                         data = *buf;
2128
2129                 /* If this is a MCS7810 device, both test patterns must match */
2130                 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
2131                         break;
2132
2133                 pass_count++;
2134         }
2135
2136         /* Restore MCR setting */
2137         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
2138                 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
2139                 0, MOS_WDR_TIMEOUT);
2140
2141         kfree(buf);
2142
2143         if (pass_count == 16)
2144                 return 1;
2145
2146         return 0;
2147 }
2148
2149 static int mos7840_probe(struct usb_serial *serial,
2150                                 const struct usb_device_id *id)
2151 {
2152         u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
2153         u8 *buf;
2154         int device_type;
2155
2156         if (product == MOSCHIP_DEVICE_ID_7810 ||
2157                 product == MOSCHIP_DEVICE_ID_7820) {
2158                 device_type = product;
2159                 goto out;
2160         }
2161
2162         buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2163         if (!buf)
2164                 return -ENOMEM;
2165
2166         usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2167                         MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2168                         VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2169
2170         /* For a MCS7840 device GPIO0 must be set to 1 */
2171         if (buf[0] & 0x01)
2172                 device_type = MOSCHIP_DEVICE_ID_7840;
2173         else if (mos7810_check(serial))
2174                 device_type = MOSCHIP_DEVICE_ID_7810;
2175         else
2176                 device_type = MOSCHIP_DEVICE_ID_7820;
2177
2178         kfree(buf);
2179 out:
2180         usb_set_serial_data(serial, (void *)(unsigned long)device_type);
2181
2182         return 0;
2183 }
2184
2185 static int mos7840_calc_num_ports(struct usb_serial *serial)
2186 {
2187         int device_type = (unsigned long)usb_get_serial_data(serial);
2188         int mos7840_num_ports;
2189
2190         mos7840_num_ports = (device_type >> 4) & 0x000F;
2191
2192         return mos7840_num_ports;
2193 }
2194
2195 static int mos7840_port_probe(struct usb_serial_port *port)
2196 {
2197         struct usb_serial *serial = port->serial;
2198         int device_type = (unsigned long)usb_get_serial_data(serial);
2199         struct moschip_port *mos7840_port;
2200         int status;
2201         int pnum;
2202         __u16 Data;
2203
2204         /* we set up the pointers to the endpoints in the mos7840_open *
2205          * function, as the structures aren't created yet.             */
2206
2207         pnum = port->port_number;
2208
2209         dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
2210         mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2211         if (mos7840_port == NULL) {
2212                 dev_err(&port->dev, "%s - Out of memory\n", __func__);
2213                 return -ENOMEM;
2214         }
2215
2216         /* Initialize all port interrupt end point to port 0 int
2217          * endpoint. Our device has only one interrupt end point
2218          * common to all port */
2219
2220         mos7840_port->port = port;
2221         mos7840_set_port_private(port, mos7840_port);
2222         spin_lock_init(&mos7840_port->pool_lock);
2223
2224         /* minor is not initialised until later by
2225          * usb-serial.c:get_free_serial() and cannot therefore be used
2226          * to index device instances */
2227         mos7840_port->port_num = pnum + 1;
2228         dev_dbg(&port->dev, "port->minor = %d\n", port->minor);
2229         dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
2230
2231         if (mos7840_port->port_num == 1) {
2232                 mos7840_port->SpRegOffset = 0x0;
2233                 mos7840_port->ControlRegOffset = 0x1;
2234                 mos7840_port->DcrRegOffset = 0x4;
2235         } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 4)) {
2236                 mos7840_port->SpRegOffset = 0x8;
2237                 mos7840_port->ControlRegOffset = 0x9;
2238                 mos7840_port->DcrRegOffset = 0x16;
2239         } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 2)) {
2240                 mos7840_port->SpRegOffset = 0xa;
2241                 mos7840_port->ControlRegOffset = 0xb;
2242                 mos7840_port->DcrRegOffset = 0x19;
2243         } else if ((mos7840_port->port_num == 3) && (serial->num_ports == 4)) {
2244                 mos7840_port->SpRegOffset = 0xa;
2245                 mos7840_port->ControlRegOffset = 0xb;
2246                 mos7840_port->DcrRegOffset = 0x19;
2247         } else if ((mos7840_port->port_num == 4) && (serial->num_ports == 4)) {
2248                 mos7840_port->SpRegOffset = 0xc;
2249                 mos7840_port->ControlRegOffset = 0xd;
2250                 mos7840_port->DcrRegOffset = 0x1c;
2251         }
2252         mos7840_dump_serial_port(port, mos7840_port);
2253         mos7840_set_port_private(port, mos7840_port);
2254
2255         /* enable rx_disable bit in control register */
2256         status = mos7840_get_reg_sync(port,
2257                         mos7840_port->ControlRegOffset, &Data);
2258         if (status < 0) {
2259                 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
2260                 goto out;
2261         } else
2262                 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
2263         Data |= 0x08;   /* setting driver done bit */
2264         Data |= 0x04;   /* sp1_bit to have cts change reflect in
2265                            modem status reg */
2266
2267         /* Data |= 0x20; //rx_disable bit */
2268         status = mos7840_set_reg_sync(port,
2269                         mos7840_port->ControlRegOffset, Data);
2270         if (status < 0) {
2271                 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2272                 goto out;
2273         } else
2274                 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
2275
2276         /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2277            and 0x24 in DCR3 */
2278         Data = 0x01;
2279         status = mos7840_set_reg_sync(port,
2280                         (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2281         if (status < 0) {
2282                 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
2283                 goto out;
2284         } else
2285                 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
2286
2287         Data = 0x05;
2288         status = mos7840_set_reg_sync(port,
2289                         (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2290         if (status < 0) {
2291                 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
2292                 goto out;
2293         } else
2294                 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
2295
2296         Data = 0x24;
2297         status = mos7840_set_reg_sync(port,
2298                         (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2299         if (status < 0) {
2300                 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
2301                 goto out;
2302         } else
2303                 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
2304
2305         /* write values in clkstart0x0 and clkmulti 0x20 */
2306         Data = 0x0;
2307         status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
2308         if (status < 0) {
2309                 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2310                 goto out;
2311         } else
2312                 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2313
2314         Data = 0x20;
2315         status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
2316         if (status < 0) {
2317                 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
2318                 goto error;
2319         } else
2320                 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
2321
2322         /* write value 0x0 to scratchpad register */
2323         Data = 0x00;
2324         status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
2325         if (status < 0) {
2326                 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
2327                 goto out;
2328         } else
2329                 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
2330
2331         /* Zero Length flag register */
2332         if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
2333                 Data = 0xff;
2334                 status = mos7840_set_reg_sync(port,
2335                                 (__u16) (ZLP_REG1 +
2336                                         ((__u16)mos7840_port->port_num)), Data);
2337                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2338                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
2339                 if (status < 0) {
2340                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
2341                         goto out;
2342                 } else
2343                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
2344         } else {
2345                 Data = 0xff;
2346                 status = mos7840_set_reg_sync(port,
2347                                 (__u16) (ZLP_REG1 +
2348                                         ((__u16)mos7840_port->port_num) - 0x1), Data);
2349                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2350                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
2351                 if (status < 0) {
2352                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
2353                         goto out;
2354                 } else
2355                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
2356
2357         }
2358         mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2359         mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2360         mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2361                         GFP_KERNEL);
2362         if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2363                         !mos7840_port->dr) {
2364                 status = -ENOMEM;
2365                 goto error;
2366         }
2367
2368         mos7840_port->has_led = false;
2369
2370         /* Initialize LED timers */
2371         if (device_type == MOSCHIP_DEVICE_ID_7810) {
2372                 mos7840_port->has_led = true;
2373
2374                 mos7840_port->led_urb = usb_alloc_urb(0, GFP_KERNEL);
2375                 mos7840_port->led_dr = kmalloc(sizeof(*mos7840_port->led_dr),
2376                                                                 GFP_KERNEL);
2377                 if (!mos7840_port->led_urb || !mos7840_port->led_dr) {
2378                         status = -ENOMEM;
2379                         goto error;
2380                 }
2381
2382                 init_timer(&mos7840_port->led_timer1);
2383                 mos7840_port->led_timer1.function = mos7840_led_off;
2384                 mos7840_port->led_timer1.expires =
2385                         jiffies + msecs_to_jiffies(LED_ON_MS);
2386                 mos7840_port->led_timer1.data = (unsigned long)mos7840_port;
2387
2388                 init_timer(&mos7840_port->led_timer2);
2389                 mos7840_port->led_timer2.function = mos7840_led_flag_off;
2390                 mos7840_port->led_timer2.expires =
2391                         jiffies + msecs_to_jiffies(LED_OFF_MS);
2392                 mos7840_port->led_timer2.data = (unsigned long)mos7840_port;
2393
2394                 /* Turn off LED */
2395                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2396         }
2397 out:
2398         if (pnum == serial->num_ports - 1) {
2399                 /* Zero Length flag enable */
2400                 Data = 0x0f;
2401                 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2402                 if (status < 0) {
2403                         dev_dbg(&port->dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
2404                         goto error;
2405                 } else
2406                         dev_dbg(&port->dev, "ZLP_REG5 Writing success status%d\n", status);
2407
2408                 /* setting configuration feature to one */
2409                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2410                                 0x03, 0x00, 0x01, 0x00, NULL, 0x00,
2411                                 MOS_WDR_TIMEOUT);
2412         }
2413         return 0;
2414 error:
2415         kfree(mos7840_port->led_dr);
2416         usb_free_urb(mos7840_port->led_urb);
2417         kfree(mos7840_port->dr);
2418         kfree(mos7840_port->ctrl_buf);
2419         usb_free_urb(mos7840_port->control_urb);
2420         kfree(mos7840_port);
2421
2422         return status;
2423 }
2424
2425 static int mos7840_port_remove(struct usb_serial_port *port)
2426 {
2427         struct moschip_port *mos7840_port;
2428
2429         mos7840_port = mos7840_get_port_private(port);
2430
2431         if (mos7840_port->has_led) {
2432                 /* Turn off LED */
2433                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2434
2435                 del_timer_sync(&mos7840_port->led_timer1);
2436                 del_timer_sync(&mos7840_port->led_timer2);
2437
2438                 usb_kill_urb(mos7840_port->led_urb);
2439                 usb_free_urb(mos7840_port->led_urb);
2440                 kfree(mos7840_port->led_dr);
2441         }
2442         usb_kill_urb(mos7840_port->control_urb);
2443         usb_free_urb(mos7840_port->control_urb);
2444         kfree(mos7840_port->ctrl_buf);
2445         kfree(mos7840_port->dr);
2446         kfree(mos7840_port);
2447
2448         return 0;
2449 }
2450
2451 static struct usb_serial_driver moschip7840_4port_device = {
2452         .driver = {
2453                    .owner = THIS_MODULE,
2454                    .name = "mos7840",
2455                    },
2456         .description = DRIVER_DESC,
2457         .id_table = id_table,
2458         .num_ports = 4,
2459         .open = mos7840_open,
2460         .close = mos7840_close,
2461         .write = mos7840_write,
2462         .write_room = mos7840_write_room,
2463         .chars_in_buffer = mos7840_chars_in_buffer,
2464         .throttle = mos7840_throttle,
2465         .unthrottle = mos7840_unthrottle,
2466         .calc_num_ports = mos7840_calc_num_ports,
2467         .probe = mos7840_probe,
2468         .ioctl = mos7840_ioctl,
2469         .set_termios = mos7840_set_termios,
2470         .break_ctl = mos7840_break,
2471         .tiocmget = mos7840_tiocmget,
2472         .tiocmset = mos7840_tiocmset,
2473         .tiocmiwait = usb_serial_generic_tiocmiwait,
2474         .get_icount = usb_serial_generic_get_icount,
2475         .port_probe = mos7840_port_probe,
2476         .port_remove = mos7840_port_remove,
2477         .read_bulk_callback = mos7840_bulk_in_callback,
2478         .read_int_callback = mos7840_interrupt_callback,
2479 };
2480
2481 static struct usb_serial_driver * const serial_drivers[] = {
2482         &moschip7840_4port_device, NULL
2483 };
2484
2485 module_usb_serial_driver(serial_drivers, id_table);
2486
2487 MODULE_DESCRIPTION(DRIVER_DESC);
2488 MODULE_LICENSE("GPL");