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 static int device_type;
 187
 188 static const struct usb_device_id id_table[] = {
 189         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 190         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 191         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
 192         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
 193         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
 194         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 195         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
 196         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 197         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 198         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 199         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 200         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 201         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
 202         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 203         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
 204         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
 205         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 206         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 207         {}                      /* terminating entry */
 208 };
 209 MODULE_DEVICE_TABLE(usb, id_table);
 210
 211 /* This structure holds all of the local port information */
 212
 213 struct moschip_port {
 214         int port_num;           /*Actual port number in the device(1,2,etc) */
 215         struct urb *write_urb;  /* write URB for this port */
 216         struct urb *read_urb;   /* read URB for this port */
 217         __u8 shadowLCR;         /* last LCR value received */
 218         __u8 shadowMCR;         /* last MCR value received */
 219         char open;
 220         char open_ports;
 221         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 222         struct usb_serial_port *port;   /* loop back to the owner of this object */
 223
 224         /* Offsets */
 225         __u8 SpRegOffset;
 226         __u8 ControlRegOffset;
 227         __u8 DcrRegOffset;
 228         /* for processing control URBS in interrupt context */
 229         struct urb *control_urb;
 230         struct usb_ctrlrequest *dr;
 231         char *ctrl_buf;
 232         int MsrLsr;
 233
 234         spinlock_t pool_lock;
 235         struct urb *write_urb_pool[NUM_URBS];
 236         char busy[NUM_URBS];
 237         bool read_urb_busy;
 238
 239         /* For device(s) with LED indicator */
 240         bool has_led;
 241         bool led_flag;
 242         struct timer_list led_timer1;   /* Timer for LED on */
 243         struct timer_list led_timer2;   /* Timer for LED off */
 244 };
 245
 246 /*
 247  * mos7840_set_reg_sync
 248  *      To set the Control register by calling usb_fill_control_urb function
 249  *      by passing usb_sndctrlpipe function as parameter.
 250  */
 251
 252 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 253                                 __u16 val)
 254 {
 255         struct usb_device *dev = port->serial->dev;
 256         val = val & 0x00ff;
 257         dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
 258
 259         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 260                                MCS_WR_RTYPE, val, reg, NULL, 0,
 261                                MOS_WDR_TIMEOUT);
 262 }
 263
 264 /*
 265  * mos7840_get_reg_sync
 266  *      To set the Uart register by calling usb_fill_control_urb function by
 267  *      passing usb_rcvctrlpipe function as parameter.
 268  */
 269
 270 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 271                                 __u16 *val)
 272 {
 273         struct usb_device *dev = port->serial->dev;
 274         int ret = 0;
 275         u8 *buf;
 276
 277         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 278         if (!buf)
 279                 return -ENOMEM;
 280
 281         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 282                               MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
 283                               MOS_WDR_TIMEOUT);
 284         *val = buf[0];
 285         dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
 286
 287         kfree(buf);
 288         return ret;
 289 }
 290
 291 /*
 292  * mos7840_set_uart_reg
 293  *      To set the Uart register by calling usb_fill_control_urb function by
 294  *      passing usb_sndctrlpipe function as parameter.
 295  */
 296
 297 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 298                                 __u16 val)
 299 {
 300
 301         struct usb_device *dev = port->serial->dev;
 302         val = val & 0x00ff;
 303         /* For the UART control registers, the application number need
 304            to be Or'ed */
 305         if (port->serial->num_ports == 4) {
 306                 val |= ((__u16)port->port_number + 1) << 8;
 307         } else {
 308                 if (port->port_number == 0) {
 309                         val |= ((__u16)port->port_number + 1) << 8;
 310                 } else {
 311                         val |= ((__u16)port->port_number + 2) << 8;
 312                 }
 313         }
 314         dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
 315         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 316                                MCS_WR_RTYPE, val, reg, NULL, 0,
 317                                MOS_WDR_TIMEOUT);
 318
 319 }
 320
 321 /*
 322  * mos7840_get_uart_reg
 323  *      To set the Control register by calling usb_fill_control_urb function
 324  *      by passing usb_rcvctrlpipe function as parameter.
 325  */
 326 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 327                                 __u16 *val)
 328 {
 329         struct usb_device *dev = port->serial->dev;
 330         int ret = 0;
 331         __u16 Wval;
 332         u8 *buf;
 333
 334         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 335         if (!buf)
 336                 return -ENOMEM;
 337
 338         /* Wval  is same as application number */
 339         if (port->serial->num_ports == 4) {
 340                 Wval = ((__u16)port->port_number + 1) << 8;
 341         } else {
 342                 if (port->port_number == 0) {
 343                         Wval = ((__u16)port->port_number + 1) << 8;
 344                 } else {
 345                         Wval = ((__u16)port->port_number + 2) << 8;
 346                 }
 347         }
 348         dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
 349         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 350                               MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
 351                               MOS_WDR_TIMEOUT);
 352         *val = buf[0];
 353
 354         kfree(buf);
 355         return ret;
 356 }
 357
 358 static void mos7840_dump_serial_port(struct usb_serial_port *port,
 359                                      struct moschip_port *mos7840_port)
 360 {
 361
 362         dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
 363         dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
 364         dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
 365
 366 }
 367
 368 /************************************************************************/
 369 /************************************************************************/
 370 /*             I N T E R F A C E   F U N C T I O N S                    */
 371 /*             I N T E R F A C E   F U N C T I O N S                    */
 372 /************************************************************************/
 373 /************************************************************************/
 374
 375 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 376                                             struct moschip_port *data)
 377 {
 378         usb_set_serial_port_data(port, (void *)data);
 379 }
 380
 381 static inline struct moschip_port *mos7840_get_port_private(struct
 382                                                             usb_serial_port
 383                                                             *port)
 384 {
 385         return (struct moschip_port *)usb_get_serial_port_data(port);
 386 }
 387
 388 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 389 {
 390         struct moschip_port *mos7840_port;
 391         struct async_icount *icount;
 392         mos7840_port = port;
 393         if (new_msr &
 394             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 395              MOS_MSR_DELTA_CD)) {
 396                 icount = &mos7840_port->port->icount;
 397
 398                 /* update input line counters */
 399                 if (new_msr & MOS_MSR_DELTA_CTS)
 400                         icount->cts++;
 401                 if (new_msr & MOS_MSR_DELTA_DSR)
 402                         icount->dsr++;
 403                 if (new_msr & MOS_MSR_DELTA_CD)
 404                         icount->dcd++;
 405                 if (new_msr & MOS_MSR_DELTA_RI)
 406                         icount->rng++;
 407
 408                 wake_up_interruptible(&port->port->port.delta_msr_wait);
 409         }
 410 }
 411
 412 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 413 {
 414         struct async_icount *icount;
 415
 416         if (new_lsr & SERIAL_LSR_BI) {
 417                 /*
 418                  * Parity and Framing errors only count if they
 419                  * occur exclusive of a break being
 420                  * received.
 421                  */
 422                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 423         }
 424
 425         /* update input line counters */
 426         icount = &port->port->icount;
 427         if (new_lsr & SERIAL_LSR_BI)
 428                 icount->brk++;
 429         if (new_lsr & SERIAL_LSR_OE)
 430                 icount->overrun++;
 431         if (new_lsr & SERIAL_LSR_PE)
 432                 icount->parity++;
 433         if (new_lsr & SERIAL_LSR_FE)
 434                 icount->frame++;
 435 }
 436
 437 /************************************************************************/
 438 /************************************************************************/
 439 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 440 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 441 /************************************************************************/
 442 /************************************************************************/
 443
 444 static void mos7840_control_callback(struct urb *urb)
 445 {
 446         unsigned char *data;
 447         struct moschip_port *mos7840_port;
 448         struct device *dev = &urb->dev->dev;
 449         __u8 regval = 0x0;
 450         int status = urb->status;
 451
 452         mos7840_port = urb->context;
 453
 454         switch (status) {
 455         case 0:
 456                 /* success */
 457                 break;
 458         case -ECONNRESET:
 459         case -ENOENT:
 460         case -ESHUTDOWN:
 461                 /* this urb is terminated, clean up */
 462                 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
 463                 return;
 464         default:
 465                 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
 466                 return;
 467         }
 468
 469         dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length);
 470         dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__,
 471                 mos7840_port->MsrLsr, mos7840_port->port_num);
 472         data = urb->transfer_buffer;
 473         regval = (__u8) data[0];
 474         dev_dbg(dev, "%s data is %x\n", __func__, regval);
 475         if (mos7840_port->MsrLsr == 0)
 476                 mos7840_handle_new_msr(mos7840_port, regval);
 477         else if (mos7840_port->MsrLsr == 1)
 478                 mos7840_handle_new_lsr(mos7840_port, regval);
 479 }
 480
 481 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 482                            __u16 *val)
 483 {
 484         struct usb_device *dev = mcs->port->serial->dev;
 485         struct usb_ctrlrequest *dr = mcs->dr;
 486         unsigned char *buffer = mcs->ctrl_buf;
 487         int ret;
 488
 489         dr->bRequestType = MCS_RD_RTYPE;
 490         dr->bRequest = MCS_RDREQ;
 491         dr->wValue = cpu_to_le16(Wval); /* 0 */
 492         dr->wIndex = cpu_to_le16(reg);
 493         dr->wLength = cpu_to_le16(2);
 494
 495         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 496                              (unsigned char *)dr, buffer, 2,
 497                              mos7840_control_callback, mcs);
 498         mcs->control_urb->transfer_buffer_length = 2;
 499         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 500         return ret;
 501 }
 502
 503 static void mos7840_set_led_callback(struct urb *urb)
 504 {
 505         switch (urb->status) {
 506         case 0:
 507                 /* Success */
 508                 break;
 509         case -ECONNRESET:
 510         case -ENOENT:
 511         case -ESHUTDOWN:
 512                 /* This urb is terminated, clean up */
 513                 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d",
 514                         __func__, urb->status);
 515                 break;
 516         default:
 517                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d",
 518                         __func__, urb->status);
 519         }
 520 }
 521
 522 static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
 523                                 __u16 reg)
 524 {
 525         struct usb_device *dev = mcs->port->serial->dev;
 526         struct usb_ctrlrequest *dr = mcs->dr;
 527
 528         dr->bRequestType = MCS_WR_RTYPE;
 529         dr->bRequest = MCS_WRREQ;
 530         dr->wValue = cpu_to_le16(wval);
 531         dr->wIndex = cpu_to_le16(reg);
 532         dr->wLength = cpu_to_le16(0);
 533
 534         usb_fill_control_urb(mcs->control_urb, dev, usb_sndctrlpipe(dev, 0),
 535                 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
 536
 537         usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 538 }
 539
 540 static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
 541                                 __u16 val)
 542 {
 543         struct usb_device *dev = port->serial->dev;
 544
 545         usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
 546                         val, reg, NULL, 0, MOS_WDR_TIMEOUT);
 547 }
 548
 549 static void mos7840_led_off(unsigned long arg)
 550 {
 551         struct moschip_port *mcs = (struct moschip_port *) arg;
 552
 553         /* Turn off LED */
 554         mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
 555         mod_timer(&mcs->led_timer2,
 556                                 jiffies + msecs_to_jiffies(LED_OFF_MS));
 557 }
 558
 559 static void mos7840_led_flag_off(unsigned long arg)
 560 {
 561         struct moschip_port *mcs = (struct moschip_port *) arg;
 562
 563         mcs->led_flag = false;
 564 }
 565
 566 /*****************************************************************************
 567  * mos7840_interrupt_callback
 568  *      this is the callback function for when we have received data on the
 569  *      interrupt endpoint.
 570  *****************************************************************************/
 571
 572 static void mos7840_interrupt_callback(struct urb *urb)
 573 {
 574         int result;
 575         int length;
 576         struct moschip_port *mos7840_port;
 577         struct usb_serial *serial;
 578         __u16 Data;
 579         unsigned char *data;
 580         __u8 sp[5], st;
 581         int i, rv = 0;
 582         __u16 wval, wreg = 0;
 583         int status = urb->status;
 584
 585         switch (status) {
 586         case 0:
 587                 /* success */
 588                 break;
 589         case -ECONNRESET:
 590         case -ENOENT:
 591         case -ESHUTDOWN:
 592                 /* this urb is terminated, clean up */
 593                 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
 594                         __func__, status);
 595                 return;
 596         default:
 597                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
 598                         __func__, status);
 599                 goto exit;
 600         }
 601
 602         length = urb->actual_length;
 603         data = urb->transfer_buffer;
 604
 605         serial = urb->context;
 606
 607         /* Moschip get 5 bytes
 608          * Byte 1 IIR Port 1 (port.number is 0)
 609          * Byte 2 IIR Port 2 (port.number is 1)
 610          * Byte 3 IIR Port 3 (port.number is 2)
 611          * Byte 4 IIR Port 4 (port.number is 3)
 612          * Byte 5 FIFO status for both */
 613
 614         if (length && length > 5) {
 615                 dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n");
 616                 return;
 617         }
 618
 619         sp[0] = (__u8) data[0];
 620         sp[1] = (__u8) data[1];
 621         sp[2] = (__u8) data[2];
 622         sp[3] = (__u8) data[3];
 623         st = (__u8) data[4];
 624
 625         for (i = 0; i < serial->num_ports; i++) {
 626                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 627                 wval = ((__u16)serial->port[i]->port_number + 1) << 8;
 628                 if (mos7840_port->open) {
 629                         if (sp[i] & 0x01) {
 630                                 dev_dbg(&urb->dev->dev, "SP%d No Interrupt !!!\n", i);
 631                         } else {
 632                                 switch (sp[i] & 0x0f) {
 633                                 case SERIAL_IIR_RLS:
 634                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Receiver status error or \n", i);
 635                                         dev_dbg(&urb->dev->dev, "address bit detected in 9-bit mode\n");
 636                                         mos7840_port->MsrLsr = 1;
 637                                         wreg = LINE_STATUS_REGISTER;
 638                                         break;
 639                                 case SERIAL_IIR_MS:
 640                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Modem status change\n", i);
 641                                         mos7840_port->MsrLsr = 0;
 642                                         wreg = MODEM_STATUS_REGISTER;
 643                                         break;
 644                                 }
 645                                 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 646                         }
 647                 }
 648         }
 649         if (!(rv < 0))
 650                 /* the completion handler for the control urb will resubmit */
 651                 return;
 652 exit:
 653         result = usb_submit_urb(urb, GFP_ATOMIC);
 654         if (result) {
 655                 dev_err(&urb->dev->dev,
 656                         "%s - Error %d submitting interrupt urb\n",
 657                         __func__, result);
 658         }
 659 }
 660
 661 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 662                                        const char *function)
 663 {
 664         if (!port) {
 665                 pr_debug("%s - port == NULL\n", function);
 666                 return -1;
 667         }
 668         if (!port->serial) {
 669                 pr_debug("%s - port->serial == NULL\n", function);
 670                 return -1;
 671         }
 672
 673         return 0;
 674 }
 675
 676 /* Inline functions to check the sanity of a pointer that is passed to us */
 677 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 678                                          const char *function)
 679 {
 680         if (!serial) {
 681                 pr_debug("%s - serial == NULL\n", function);
 682                 return -1;
 683         }
 684         if (!serial->type) {
 685                 pr_debug("%s - serial->type == NULL!\n", function);
 686                 return -1;
 687         }
 688
 689         return 0;
 690 }
 691
 692 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 693                                                  const char *function)
 694 {
 695         /* if no port was specified, or it fails a paranoia check */
 696         if (!port ||
 697             mos7840_port_paranoia_check(port, function) ||
 698             mos7840_serial_paranoia_check(port->serial, function)) {
 699                 /* then say that we don't have a valid usb_serial thing,
 700                  * which will end up genrating -ENODEV return values */
 701                 return NULL;
 702         }
 703
 704         return port->serial;
 705 }
 706
 707 /*****************************************************************************
 708  * mos7840_bulk_in_callback
 709  *      this is the callback function for when we have received data on the
 710  *      bulk in endpoint.
 711  *****************************************************************************/
 712
 713 static void mos7840_bulk_in_callback(struct urb *urb)
 714 {
 715         int retval;
 716         unsigned char *data;
 717         struct usb_serial *serial;
 718         struct usb_serial_port *port;
 719         struct moschip_port *mos7840_port;
 720         int status = urb->status;
 721
 722         mos7840_port = urb->context;
 723         if (!mos7840_port)
 724                 return;
 725
 726         if (status) {
 727                 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
 728                 mos7840_port->read_urb_busy = false;
 729                 return;
 730         }
 731
 732         port = mos7840_port->port;
 733         if (mos7840_port_paranoia_check(port, __func__)) {
 734                 mos7840_port->read_urb_busy = false;
 735                 return;
 736         }
 737
 738         serial = mos7840_get_usb_serial(port, __func__);
 739         if (!serial) {
 740                 mos7840_port->read_urb_busy = false;
 741                 return;
 742         }
 743
 744         data = urb->transfer_buffer;
 745         usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
 746
 747         if (urb->actual_length) {
 748                 struct tty_port *tport = &mos7840_port->port->port;
 749                 tty_insert_flip_string(tport, data, urb->actual_length);
 750                 tty_flip_buffer_push(tport);
 751                 port->icount.rx += urb->actual_length;
 752                 dev_dbg(&port->dev, "icount.rx is %d:\n", port->icount.rx);
 753         }
 754
 755         if (!mos7840_port->read_urb) {
 756                 dev_dbg(&port->dev, "%s", "URB KILLED !!!\n");
 757                 mos7840_port->read_urb_busy = false;
 758                 return;
 759         }
 760
 761         /* Turn on LED */
 762         if (mos7840_port->has_led && !mos7840_port->led_flag) {
 763                 mos7840_port->led_flag = true;
 764                 mos7840_set_led_async(mos7840_port, 0x0301,
 765                                         MODEM_CONTROL_REGISTER);
 766                 mod_timer(&mos7840_port->led_timer1,
 767                                 jiffies + msecs_to_jiffies(LED_ON_MS));
 768         }
 769
 770         mos7840_port->read_urb_busy = true;
 771         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 772
 773         if (retval) {
 774                 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
 775                 mos7840_port->read_urb_busy = false;
 776         }
 777 }
 778
 779 /*****************************************************************************
 780  * mos7840_bulk_out_data_callback
 781  *      this is the callback function for when we have finished sending
 782  *      serial data on the bulk out endpoint.
 783  *****************************************************************************/
 784
 785 static void mos7840_bulk_out_data_callback(struct urb *urb)
 786 {
 787         struct moschip_port *mos7840_port;
 788         struct usb_serial_port *port;
 789         int status = urb->status;
 790         int i;
 791
 792         mos7840_port = urb->context;
 793         port = mos7840_port->port;
 794         spin_lock(&mos7840_port->pool_lock);
 795         for (i = 0; i < NUM_URBS; i++) {
 796                 if (urb == mos7840_port->write_urb_pool[i]) {
 797                         mos7840_port->busy[i] = 0;
 798                         break;
 799                 }
 800         }
 801         spin_unlock(&mos7840_port->pool_lock);
 802
 803         if (status) {
 804                 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
 805                 return;
 806         }
 807
 808         if (mos7840_port_paranoia_check(port, __func__))
 809                 return;
 810
 811         if (mos7840_port->open)
 812                 tty_port_tty_wakeup(&port->port);
 813
 814 }
 815
 816 /************************************************************************/
 817 /*       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       */
 818 /************************************************************************/
 819 #ifdef MCSSerialProbe
 820 static int mos7840_serial_probe(struct usb_serial *serial,
 821                                 const struct usb_device_id *id)
 822 {
 823
 824         /*need to implement the mode_reg reading and updating\
 825            structures usb_serial_ device_type\
 826            (i.e num_ports, num_bulkin,bulkout etc) */
 827         /* Also we can update the changes  attach */
 828         return 1;
 829 }
 830 #endif
 831
 832 /*****************************************************************************
 833  * mos7840_open
 834  *      this function is called by the tty driver when a port is opened
 835  *      If successful, we return 0
 836  *      Otherwise we return a negative error number.
 837  *****************************************************************************/
 838
 839 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
 840 {
 841         int response;
 842         int j;
 843         struct usb_serial *serial;
 844         struct urb *urb;
 845         __u16 Data;
 846         int status;
 847         struct moschip_port *mos7840_port;
 848         struct moschip_port *port0;
 849
 850         if (mos7840_port_paranoia_check(port, __func__))
 851                 return -ENODEV;
 852
 853         serial = port->serial;
 854
 855         if (mos7840_serial_paranoia_check(serial, __func__))
 856                 return -ENODEV;
 857
 858         mos7840_port = mos7840_get_port_private(port);
 859         port0 = mos7840_get_port_private(serial->port[0]);
 860
 861         if (mos7840_port == NULL || port0 == NULL)
 862                 return -ENODEV;
 863
 864         usb_clear_halt(serial->dev, port->write_urb->pipe);
 865         usb_clear_halt(serial->dev, port->read_urb->pipe);
 866         port0->open_ports++;
 867
 868         /* Initialising the write urb pool */
 869         for (j = 0; j < NUM_URBS; ++j) {
 870                 urb = usb_alloc_urb(0, GFP_KERNEL);
 871                 mos7840_port->write_urb_pool[j] = urb;
 872
 873                 if (urb == NULL) {
 874                         dev_err(&port->dev, "No more urbs???\n");
 875                         continue;
 876                 }
 877
 878                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 879                                                                 GFP_KERNEL);
 880                 if (!urb->transfer_buffer) {
 881                         usb_free_urb(urb);
 882                         mos7840_port->write_urb_pool[j] = NULL;
 883                         dev_err(&port->dev,
 884                                 "%s-out of memory for urb buffers.\n",
 885                                 __func__);
 886                         continue;
 887                 }
 888         }
 889
 890 /*****************************************************************************
 891  * Initialize MCS7840 -- Write Init values to corresponding Registers
 892  *
 893  * Register Index
 894  * 1 : IER
 895  * 2 : FCR
 896  * 3 : LCR
 897  * 4 : MCR
 898  *
 899  * 0x08 : SP1/2 Control Reg
 900  *****************************************************************************/
 901
 902         /* NEED to check the following Block */
 903
 904         Data = 0x0;
 905         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 906         if (status < 0) {
 907                 dev_dbg(&port->dev, "Reading Spreg failed\n");
 908                 goto err;
 909         }
 910         Data |= 0x80;
 911         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 912         if (status < 0) {
 913                 dev_dbg(&port->dev, "writing Spreg failed\n");
 914                 goto err;
 915         }
 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         /* End of block to be checked */
 924
 925         Data = 0x0;
 926         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 927                                                                         &Data);
 928         if (status < 0) {
 929                 dev_dbg(&port->dev, "Reading Controlreg failed\n");
 930                 goto err;
 931         }
 932         Data |= 0x08;           /* Driver done bit */
 933         Data |= 0x20;           /* rx_disable */
 934         status = mos7840_set_reg_sync(port,
 935                                 mos7840_port->ControlRegOffset, Data);
 936         if (status < 0) {
 937                 dev_dbg(&port->dev, "writing Controlreg failed\n");
 938                 goto err;
 939         }
 940         /* do register settings here */
 941         /* Set all regs to the device default values. */
 942         /***********************************
 943          * First Disable all interrupts.
 944          ***********************************/
 945         Data = 0x00;
 946         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 947         if (status < 0) {
 948                 dev_dbg(&port->dev, "disabling interrupts failed\n");
 949                 goto err;
 950         }
 951         /* Set FIFO_CONTROL_REGISTER to the default value */
 952         Data = 0x00;
 953         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 954         if (status < 0) {
 955                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
 956                 goto err;
 957         }
 958
 959         Data = 0xcf;
 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 = 0x03;
 967         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 968         mos7840_port->shadowLCR = Data;
 969
 970         Data = 0x0b;
 971         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
 972         mos7840_port->shadowMCR = Data;
 973
 974         Data = 0x00;
 975         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 976         mos7840_port->shadowLCR = Data;
 977
 978         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
 979         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 980
 981         Data = 0x0c;
 982         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
 983
 984         Data = 0x0;
 985         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
 986
 987         Data = 0x00;
 988         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 989
 990         Data = Data & ~SERIAL_LCR_DLAB;
 991         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 992         mos7840_port->shadowLCR = Data;
 993
 994         /* clearing Bulkin and Bulkout Fifo */
 995         Data = 0x0;
 996         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 997
 998         Data = Data | 0x0c;
 999         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1000
1001         Data = Data & ~0x0c;
1002         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1003         /* Finally enable all interrupts */
1004         Data = 0x0c;
1005         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1006
1007         /* clearing rx_disable */
1008         Data = 0x0;
1009         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1010                                                                         &Data);
1011         Data = Data & ~0x20;
1012         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1013                                                                         Data);
1014
1015         /* rx_negate */
1016         Data = 0x0;
1017         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1018                                                                         &Data);
1019         Data = Data | 0x10;
1020         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1021                                                                         Data);
1022
1023         /* Check to see if we've set up our endpoint info yet    *
1024          * (can't set it up in mos7840_startup as the structures *
1025          * were not set up at that time.)                        */
1026         if (port0->open_ports == 1) {
1027                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1028                         /* set up interrupt urb */
1029                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1030                                 serial->dev,
1031                                 usb_rcvintpipe(serial->dev,
1032                                 serial->port[0]->interrupt_in_endpointAddress),
1033                                 serial->port[0]->interrupt_in_buffer,
1034                                 serial->port[0]->interrupt_in_urb->
1035                                 transfer_buffer_length,
1036                                 mos7840_interrupt_callback,
1037                                 serial,
1038                                 serial->port[0]->interrupt_in_urb->interval);
1039
1040                         /* start interrupt read for mos7840               *
1041                          * will continue as long as mos7840 is connected  */
1042
1043                         response =
1044                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1045                                            GFP_KERNEL);
1046                         if (response) {
1047                                 dev_err(&port->dev, "%s - Error %d submitting "
1048                                         "interrupt urb\n", __func__, response);
1049                         }
1050
1051                 }
1052
1053         }
1054
1055         /* see if we've set up our endpoint info yet   *
1056          * (can't set it up in mos7840_startup as the  *
1057          * structures were not set up at that time.)   */
1058
1059         dev_dbg(&port->dev, "port number is %d\n", port->port_number);
1060         dev_dbg(&port->dev, "minor number is %d\n", port->minor);
1061         dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
1062         dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
1063         dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
1064         dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
1065         mos7840_port->read_urb = port->read_urb;
1066
1067         /* set up our bulk in urb */
1068         if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1069                 usb_fill_bulk_urb(mos7840_port->read_urb,
1070                         serial->dev,
1071                         usb_rcvbulkpipe(serial->dev,
1072                                 (port->bulk_in_endpointAddress) + 2),
1073                         port->bulk_in_buffer,
1074                         mos7840_port->read_urb->transfer_buffer_length,
1075                         mos7840_bulk_in_callback, mos7840_port);
1076         } else {
1077                 usb_fill_bulk_urb(mos7840_port->read_urb,
1078                         serial->dev,
1079                         usb_rcvbulkpipe(serial->dev,
1080                                 port->bulk_in_endpointAddress),
1081                         port->bulk_in_buffer,
1082                         mos7840_port->read_urb->transfer_buffer_length,
1083                         mos7840_bulk_in_callback, mos7840_port);
1084         }
1085
1086         dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
1087         mos7840_port->read_urb_busy = true;
1088         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1089         if (response) {
1090                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1091                         __func__, response);
1092                 mos7840_port->read_urb_busy = false;
1093         }
1094
1095         /* initialize our wait queues */
1096         init_waitqueue_head(&mos7840_port->wait_chase);
1097
1098         /* initialize our port settings */
1099         /* Must set to enable ints! */
1100         mos7840_port->shadowMCR = MCR_MASTER_IE;
1101         /* send a open port command */
1102         mos7840_port->open = 1;
1103         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1104
1105         return 0;
1106 err:
1107         for (j = 0; j < NUM_URBS; ++j) {
1108                 urb = mos7840_port->write_urb_pool[j];
1109                 if (!urb)
1110                         continue;
1111                 kfree(urb->transfer_buffer);
1112                 usb_free_urb(urb);
1113         }
1114         return status;
1115 }
1116
1117 /*****************************************************************************
1118  * mos7840_chars_in_buffer
1119  *      this function is called by the tty driver when it wants to know how many
1120  *      bytes of data we currently have outstanding in the port (data that has
1121  *      been written, but hasn't made it out the port yet)
1122  *      If successful, we return the number of bytes left to be written in the
1123  *      system,
1124  *      Otherwise we return zero.
1125  *****************************************************************************/
1126
1127 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1128 {
1129         struct usb_serial_port *port = tty->driver_data;
1130         int i;
1131         int chars = 0;
1132         unsigned long flags;
1133         struct moschip_port *mos7840_port;
1134
1135         if (mos7840_port_paranoia_check(port, __func__))
1136                 return 0;
1137
1138         mos7840_port = mos7840_get_port_private(port);
1139         if (mos7840_port == NULL)
1140                 return 0;
1141
1142         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1143         for (i = 0; i < NUM_URBS; ++i) {
1144                 if (mos7840_port->busy[i]) {
1145                         struct urb *urb = mos7840_port->write_urb_pool[i];
1146                         chars += urb->transfer_buffer_length;
1147                 }
1148         }
1149         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1150         dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1151         return chars;
1152
1153 }
1154
1155 /*****************************************************************************
1156  * mos7840_close
1157  *      this function is called by the tty driver when a port is closed
1158  *****************************************************************************/
1159
1160 static void mos7840_close(struct usb_serial_port *port)
1161 {
1162         struct usb_serial *serial;
1163         struct moschip_port *mos7840_port;
1164         struct moschip_port *port0;
1165         int j;
1166         __u16 Data;
1167
1168         if (mos7840_port_paranoia_check(port, __func__))
1169                 return;
1170
1171         serial = mos7840_get_usb_serial(port, __func__);
1172         if (!serial)
1173                 return;
1174
1175         mos7840_port = mos7840_get_port_private(port);
1176         port0 = mos7840_get_port_private(serial->port[0]);
1177
1178         if (mos7840_port == NULL || port0 == NULL)
1179                 return;
1180
1181         for (j = 0; j < NUM_URBS; ++j)
1182                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1183
1184         /* Freeing Write URBs */
1185         for (j = 0; j < NUM_URBS; ++j) {
1186                 if (mos7840_port->write_urb_pool[j]) {
1187                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1188                                 kfree(mos7840_port->write_urb_pool[j]->
1189                                       transfer_buffer);
1190
1191                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1192                 }
1193         }
1194
1195         usb_kill_urb(mos7840_port->write_urb);
1196         usb_kill_urb(mos7840_port->read_urb);
1197         mos7840_port->read_urb_busy = false;
1198
1199         port0->open_ports--;
1200         dev_dbg(&port->dev, "%s in close%d\n", __func__, port0->open_ports);
1201         if (port0->open_ports == 0) {
1202                 if (serial->port[0]->interrupt_in_urb) {
1203                         dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n");
1204                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1205                 }
1206         }
1207
1208         if (mos7840_port->write_urb) {
1209                 /* if this urb had a transfer buffer already (old tx) free it */
1210                 kfree(mos7840_port->write_urb->transfer_buffer);
1211                 usb_free_urb(mos7840_port->write_urb);
1212         }
1213
1214         Data = 0x0;
1215         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1216
1217         Data = 0x00;
1218         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1219
1220         mos7840_port->open = 0;
1221 }
1222
1223 /************************************************************************
1224  *
1225  * mos7840_block_until_chase_response
1226  *
1227  *      This function will block the close until one of the following:
1228  *              1. Response to our Chase comes from mos7840
1229  *              2. A timeout of 10 seconds without activity has expired
1230  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1231  *
1232  ************************************************************************/
1233
1234 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1235                                         struct moschip_port *mos7840_port)
1236 {
1237         int timeout = msecs_to_jiffies(1000);
1238         int wait = 10;
1239         int count;
1240
1241         while (1) {
1242                 count = mos7840_chars_in_buffer(tty);
1243
1244                 /* Check for Buffer status */
1245                 if (count <= 0)
1246                         return;
1247
1248                 /* Block the thread for a while */
1249                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1250                                                timeout);
1251                 /* No activity.. count down section */
1252                 wait--;
1253                 if (wait == 0) {
1254                         dev_dbg(&mos7840_port->port->dev, "%s - TIMEOUT\n", __func__);
1255                         return;
1256                 } else {
1257                         /* Reset timeout value back to seconds */
1258                         wait = 10;
1259                 }
1260         }
1261
1262 }
1263
1264 /*****************************************************************************
1265  * mos7840_break
1266  *      this function sends a break to the port
1267  *****************************************************************************/
1268 static void mos7840_break(struct tty_struct *tty, int break_state)
1269 {
1270         struct usb_serial_port *port = tty->driver_data;
1271         unsigned char data;
1272         struct usb_serial *serial;
1273         struct moschip_port *mos7840_port;
1274
1275         if (mos7840_port_paranoia_check(port, __func__))
1276                 return;
1277
1278         serial = mos7840_get_usb_serial(port, __func__);
1279         if (!serial)
1280                 return;
1281
1282         mos7840_port = mos7840_get_port_private(port);
1283
1284         if (mos7840_port == NULL)
1285                 return;
1286
1287         /* flush and block until tx is empty */
1288         mos7840_block_until_chase_response(tty, mos7840_port);
1289
1290         if (break_state == -1)
1291                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1292         else
1293                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1294
1295         /* FIXME: no locking on shadowLCR anywhere in driver */
1296         mos7840_port->shadowLCR = data;
1297         dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1298         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1299                              mos7840_port->shadowLCR);
1300 }
1301
1302 /*****************************************************************************
1303  * mos7840_write_room
1304  *      this function is called by the tty driver when it wants to know how many
1305  *      bytes of data we can accept for a specific port.
1306  *      If successful, we return the amount of room that we have for this port
1307  *      Otherwise we return a negative error number.
1308  *****************************************************************************/
1309
1310 static int mos7840_write_room(struct tty_struct *tty)
1311 {
1312         struct usb_serial_port *port = tty->driver_data;
1313         int i;
1314         int room = 0;
1315         unsigned long flags;
1316         struct moschip_port *mos7840_port;
1317
1318         if (mos7840_port_paranoia_check(port, __func__))
1319                 return -1;
1320
1321         mos7840_port = mos7840_get_port_private(port);
1322         if (mos7840_port == NULL)
1323                 return -1;
1324
1325         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1326         for (i = 0; i < NUM_URBS; ++i) {
1327                 if (!mos7840_port->busy[i])
1328                         room += URB_TRANSFER_BUFFER_SIZE;
1329         }
1330         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1331
1332         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1333         dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room);
1334         return room;
1335
1336 }
1337
1338 /*****************************************************************************
1339  * mos7840_write
1340  *      this function is called by the tty driver when data should be written to
1341  *      the port.
1342  *      If successful, we return the number of bytes written, otherwise we
1343  *      return a negative error number.
1344  *****************************************************************************/
1345
1346 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1347                          const unsigned char *data, int count)
1348 {
1349         int status;
1350         int i;
1351         int bytes_sent = 0;
1352         int transfer_size;
1353         unsigned long flags;
1354
1355         struct moschip_port *mos7840_port;
1356         struct usb_serial *serial;
1357         struct urb *urb;
1358         /* __u16 Data; */
1359         const unsigned char *current_position = data;
1360         unsigned char *data1;
1361
1362 #ifdef NOTMOS7840
1363         Data = 0x00;
1364         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1365         mos7840_port->shadowLCR = Data;
1366         dev_dbg(&port->dev, "%s: LINE_CONTROL_REGISTER is %x\n", __func__, Data);
1367         dev_dbg(&port->dev, "%s: mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1368
1369         /* Data = 0x03; */
1370         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1371         /* mos7840_port->shadowLCR=Data;//Need to add later */
1372
1373         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1374         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1375
1376         /* Data = 0x0c; */
1377         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1378         Data = 0x00;
1379         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1380         dev_dbg(&port->dev, "%s: DLL value is %x\n", __func__, Data);
1381
1382         Data = 0x0;
1383         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1384         dev_dbg(&port->dev, "%s: DLM value is %x\n", __func__, Data);
1385
1386         Data = Data & ~SERIAL_LCR_DLAB;
1387         dev_dbg(&port->dev, "%s: mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1388         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1389 #endif
1390
1391         if (mos7840_port_paranoia_check(port, __func__))
1392                 return -1;
1393
1394         serial = port->serial;
1395         if (mos7840_serial_paranoia_check(serial, __func__))
1396                 return -1;
1397
1398         mos7840_port = mos7840_get_port_private(port);
1399         if (mos7840_port == NULL)
1400                 return -1;
1401
1402         /* try to find a free urb in the list */
1403         urb = NULL;
1404
1405         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1406         for (i = 0; i < NUM_URBS; ++i) {
1407                 if (!mos7840_port->busy[i]) {
1408                         mos7840_port->busy[i] = 1;
1409                         urb = mos7840_port->write_urb_pool[i];
1410                         dev_dbg(&port->dev, "URB:%d\n", i);
1411                         break;
1412                 }
1413         }
1414         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1415
1416         if (urb == NULL) {
1417                 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1418                 goto exit;
1419         }
1420
1421         if (urb->transfer_buffer == NULL) {
1422                 urb->transfer_buffer =
1423                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1424
1425                 if (urb->transfer_buffer == NULL) {
1426                         dev_err_console(port, "%s no more kernel memory...\n",
1427                                 __func__);
1428                         goto exit;
1429                 }
1430         }
1431         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1432
1433         memcpy(urb->transfer_buffer, current_position, transfer_size);
1434
1435         /* fill urb with data and submit  */
1436         if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1437                 usb_fill_bulk_urb(urb,
1438                         serial->dev,
1439                         usb_sndbulkpipe(serial->dev,
1440                                 (port->bulk_out_endpointAddress) + 2),
1441                         urb->transfer_buffer,
1442                         transfer_size,
1443                         mos7840_bulk_out_data_callback, mos7840_port);
1444         } else {
1445                 usb_fill_bulk_urb(urb,
1446                         serial->dev,
1447                         usb_sndbulkpipe(serial->dev,
1448                                 port->bulk_out_endpointAddress),
1449                         urb->transfer_buffer,
1450                         transfer_size,
1451                         mos7840_bulk_out_data_callback, mos7840_port);
1452         }
1453
1454         data1 = urb->transfer_buffer;
1455         dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
1456
1457         /* Turn on LED */
1458         if (mos7840_port->has_led && !mos7840_port->led_flag) {
1459                 mos7840_port->led_flag = true;
1460                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0301);
1461                 mod_timer(&mos7840_port->led_timer1,
1462                                 jiffies + msecs_to_jiffies(LED_ON_MS));
1463         }
1464
1465         /* send it down the pipe */
1466         status = usb_submit_urb(urb, GFP_ATOMIC);
1467
1468         if (status) {
1469                 mos7840_port->busy[i] = 0;
1470                 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1471                         "with status = %d\n", __func__, status);
1472                 bytes_sent = status;
1473                 goto exit;
1474         }
1475         bytes_sent = transfer_size;
1476         port->icount.tx += transfer_size;
1477         dev_dbg(&port->dev, "icount.tx is %d:\n", port->icount.tx);
1478 exit:
1479         return bytes_sent;
1480
1481 }
1482
1483 /*****************************************************************************
1484  * mos7840_throttle
1485  *      this function is called by the tty driver when it wants to stop the data
1486  *      being read from the port.
1487  *****************************************************************************/
1488
1489 static void mos7840_throttle(struct tty_struct *tty)
1490 {
1491         struct usb_serial_port *port = tty->driver_data;
1492         struct moschip_port *mos7840_port;
1493         int status;
1494
1495         if (mos7840_port_paranoia_check(port, __func__))
1496                 return;
1497
1498         mos7840_port = mos7840_get_port_private(port);
1499
1500         if (mos7840_port == NULL)
1501                 return;
1502
1503         if (!mos7840_port->open) {
1504                 dev_dbg(&port->dev, "%s", "port not opened\n");
1505                 return;
1506         }
1507
1508         /* if we are implementing XON/XOFF, send the stop character */
1509         if (I_IXOFF(tty)) {
1510                 unsigned char stop_char = STOP_CHAR(tty);
1511                 status = mos7840_write(tty, port, &stop_char, 1);
1512                 if (status <= 0)
1513                         return;
1514         }
1515         /* if we are implementing RTS/CTS, toggle that line */
1516         if (tty->termios.c_cflag & CRTSCTS) {
1517                 mos7840_port->shadowMCR &= ~MCR_RTS;
1518                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1519                                          mos7840_port->shadowMCR);
1520                 if (status < 0)
1521                         return;
1522         }
1523 }
1524
1525 /*****************************************************************************
1526  * mos7840_unthrottle
1527  *      this function is called by the tty driver when it wants to resume
1528  *      the data being read from the port (called after mos7840_throttle is
1529  *      called)
1530  *****************************************************************************/
1531 static void mos7840_unthrottle(struct tty_struct *tty)
1532 {
1533         struct usb_serial_port *port = tty->driver_data;
1534         int status;
1535         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1536
1537         if (mos7840_port_paranoia_check(port, __func__))
1538                 return;
1539
1540         if (mos7840_port == NULL)
1541                 return;
1542
1543         if (!mos7840_port->open) {
1544                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1545                 return;
1546         }
1547
1548         /* if we are implementing XON/XOFF, send the start character */
1549         if (I_IXOFF(tty)) {
1550                 unsigned char start_char = START_CHAR(tty);
1551                 status = mos7840_write(tty, port, &start_char, 1);
1552                 if (status <= 0)
1553                         return;
1554         }
1555
1556         /* if we are implementing RTS/CTS, toggle that line */
1557         if (tty->termios.c_cflag & CRTSCTS) {
1558                 mos7840_port->shadowMCR |= MCR_RTS;
1559                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1560                                          mos7840_port->shadowMCR);
1561                 if (status < 0)
1562                         return;
1563         }
1564 }
1565
1566 static int mos7840_tiocmget(struct tty_struct *tty)
1567 {
1568         struct usb_serial_port *port = tty->driver_data;
1569         struct moschip_port *mos7840_port;
1570         unsigned int result;
1571         __u16 msr;
1572         __u16 mcr;
1573         int status;
1574         mos7840_port = mos7840_get_port_private(port);
1575
1576         if (mos7840_port == NULL)
1577                 return -ENODEV;
1578
1579         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1580         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1581         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1582             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1583             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1584             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1585             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1586             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1587             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1588
1589         dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1590
1591         return result;
1592 }
1593
1594 static int mos7840_tiocmset(struct tty_struct *tty,
1595                             unsigned int set, unsigned int clear)
1596 {
1597         struct usb_serial_port *port = tty->driver_data;
1598         struct moschip_port *mos7840_port;
1599         unsigned int mcr;
1600         int status;
1601
1602         mos7840_port = mos7840_get_port_private(port);
1603
1604         if (mos7840_port == NULL)
1605                 return -ENODEV;
1606
1607         /* FIXME: What locks the port registers ? */
1608         mcr = mos7840_port->shadowMCR;
1609         if (clear & TIOCM_RTS)
1610                 mcr &= ~MCR_RTS;
1611         if (clear & TIOCM_DTR)
1612                 mcr &= ~MCR_DTR;
1613         if (clear & TIOCM_LOOP)
1614                 mcr &= ~MCR_LOOPBACK;
1615
1616         if (set & TIOCM_RTS)
1617                 mcr |= MCR_RTS;
1618         if (set & TIOCM_DTR)
1619                 mcr |= MCR_DTR;
1620         if (set & TIOCM_LOOP)
1621                 mcr |= MCR_LOOPBACK;
1622
1623         mos7840_port->shadowMCR = mcr;
1624
1625         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1626         if (status < 0) {
1627                 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1628                 return status;
1629         }
1630
1631         return 0;
1632 }
1633
1634 /*****************************************************************************
1635  * mos7840_calc_baud_rate_divisor
1636  *      this function calculates the proper baud rate divisor for the specified
1637  *      baud rate.
1638  *****************************************************************************/
1639 static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1640                                           int baudRate, int *divisor,
1641                                           __u16 *clk_sel_val)
1642 {
1643         dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1644
1645         if (baudRate <= 115200) {
1646                 *divisor = 115200 / baudRate;
1647                 *clk_sel_val = 0x0;
1648         }
1649         if ((baudRate > 115200) && (baudRate <= 230400)) {
1650                 *divisor = 230400 / baudRate;
1651                 *clk_sel_val = 0x10;
1652         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1653                 *divisor = 403200 / baudRate;
1654                 *clk_sel_val = 0x20;
1655         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1656                 *divisor = 460800 / baudRate;
1657                 *clk_sel_val = 0x30;
1658         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1659                 *divisor = 806400 / baudRate;
1660                 *clk_sel_val = 0x40;
1661         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1662                 *divisor = 921600 / baudRate;
1663                 *clk_sel_val = 0x50;
1664         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1665                 *divisor = 1572864 / baudRate;
1666                 *clk_sel_val = 0x60;
1667         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1668                 *divisor = 3145728 / baudRate;
1669                 *clk_sel_val = 0x70;
1670         }
1671         return 0;
1672
1673 #ifdef NOTMCS7840
1674
1675         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1676                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1677                         *divisor = mos7840_divisor_table[i].Divisor;
1678                         return 0;
1679                 }
1680         }
1681
1682         /* After trying for all the standard baud rates    *
1683          * Try calculating the divisor for this baud rate  */
1684
1685         if (baudrate > 75 && baudrate < 230400) {
1686                 /* get the divisor */
1687                 custom = (__u16) (230400L / baudrate);
1688
1689                 /* Check for round off */
1690                 round1 = (__u16) (2304000L / baudrate);
1691                 round = (__u16) (round1 - (custom * 10));
1692                 if (round > 4)
1693                         custom++;
1694                 *divisor = custom;
1695
1696                 dev_dbg(&port->dev, " Baud %d = %d\n", baudrate, custom);
1697                 return 0;
1698         }
1699
1700         dev_dbg(&port->dev, "%s", " Baud calculation Failed...\n");
1701         return -1;
1702 #endif
1703 }
1704
1705 /*****************************************************************************
1706  * mos7840_send_cmd_write_baud_rate
1707  *      this function sends the proper command to change the baud rate of the
1708  *      specified port.
1709  *****************************************************************************/
1710
1711 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1712                                             int baudRate)
1713 {
1714         int divisor = 0;
1715         int status;
1716         __u16 Data;
1717         unsigned char number;
1718         __u16 clk_sel_val;
1719         struct usb_serial_port *port;
1720
1721         if (mos7840_port == NULL)
1722                 return -1;
1723
1724         port = mos7840_port->port;
1725         if (mos7840_port_paranoia_check(port, __func__))
1726                 return -1;
1727
1728         if (mos7840_serial_paranoia_check(port->serial, __func__))
1729                 return -1;
1730
1731         number = mos7840_port->port->port_number;
1732
1733         dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudRate);
1734         /* reset clk_uart_sel in spregOffset */
1735         if (baudRate > 115200) {
1736 #ifdef HW_flow_control
1737                 /* NOTE: need to see the pther register to modify */
1738                 /* setting h/w flow control bit to 1 */
1739                 Data = 0x2b;
1740                 mos7840_port->shadowMCR = Data;
1741                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1742                                                                         Data);
1743                 if (status < 0) {
1744                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1745                         return -1;
1746                 }
1747 #endif
1748
1749         } else {
1750 #ifdef HW_flow_control
1751                 /* setting h/w flow control bit to 0 */
1752                 Data = 0xb;
1753                 mos7840_port->shadowMCR = Data;
1754                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1755                                                                         Data);
1756                 if (status < 0) {
1757                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1758                         return -1;
1759                 }
1760 #endif
1761
1762         }
1763
1764         if (1) {                /* baudRate <= 115200) */
1765                 clk_sel_val = 0x0;
1766                 Data = 0x0;
1767                 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1768                                                    &clk_sel_val);
1769                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1770                                                                  &Data);
1771                 if (status < 0) {
1772                         dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1773                         return -1;
1774                 }
1775                 Data = (Data & 0x8f) | clk_sel_val;
1776                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1777                                                                 Data);
1778                 if (status < 0) {
1779                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1780                         return -1;
1781                 }
1782                 /* Calculate the Divisor */
1783
1784                 if (status) {
1785                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1786                         return status;
1787                 }
1788                 /* Enable access to divisor latch */
1789                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1790                 mos7840_port->shadowLCR = Data;
1791                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1792
1793                 /* Write the divisor */
1794                 Data = (unsigned char)(divisor & 0xff);
1795                 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1796                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1797
1798                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1799                 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1800                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1801
1802                 /* Disable access to divisor latch */
1803                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1804                 mos7840_port->shadowLCR = Data;
1805                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1806
1807         }
1808         return status;
1809 }
1810
1811 /*****************************************************************************
1812  * mos7840_change_port_settings
1813  *      This routine is called to set the UART on the device to match
1814  *      the specified new settings.
1815  *****************************************************************************/
1816
1817 static void mos7840_change_port_settings(struct tty_struct *tty,
1818         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1819 {
1820         int baud;
1821         unsigned cflag;
1822         unsigned iflag;
1823         __u8 lData;
1824         __u8 lParity;
1825         __u8 lStop;
1826         int status;
1827         __u16 Data;
1828         struct usb_serial_port *port;
1829         struct usb_serial *serial;
1830
1831         if (mos7840_port == NULL)
1832                 return;
1833
1834         port = mos7840_port->port;
1835
1836         if (mos7840_port_paranoia_check(port, __func__))
1837                 return;
1838
1839         if (mos7840_serial_paranoia_check(port->serial, __func__))
1840                 return;
1841
1842         serial = port->serial;
1843
1844         if (!mos7840_port->open) {
1845                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1846                 return;
1847         }
1848
1849         lData = LCR_BITS_8;
1850         lStop = LCR_STOP_1;
1851         lParity = LCR_PAR_NONE;
1852
1853         cflag = tty->termios.c_cflag;
1854         iflag = tty->termios.c_iflag;
1855
1856         /* Change the number of bits */
1857         if (cflag & CSIZE) {
1858                 switch (cflag & CSIZE) {
1859                 case CS5:
1860                         lData = LCR_BITS_5;
1861                         break;
1862
1863                 case CS6:
1864                         lData = LCR_BITS_6;
1865                         break;
1866
1867                 case CS7:
1868                         lData = LCR_BITS_7;
1869                         break;
1870                 default:
1871                 case CS8:
1872                         lData = LCR_BITS_8;
1873                         break;
1874                 }
1875         }
1876         /* Change the Parity bit */
1877         if (cflag & PARENB) {
1878                 if (cflag & PARODD) {
1879                         lParity = LCR_PAR_ODD;
1880                         dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1881                 } else {
1882                         lParity = LCR_PAR_EVEN;
1883                         dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1884                 }
1885
1886         } else {
1887                 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1888         }
1889
1890         if (cflag & CMSPAR)
1891                 lParity = lParity | 0x20;
1892
1893         /* Change the Stop bit */
1894         if (cflag & CSTOPB) {
1895                 lStop = LCR_STOP_2;
1896                 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1897         } else {
1898                 lStop = LCR_STOP_1;
1899                 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1900         }
1901
1902         /* Update the LCR with the correct value */
1903         mos7840_port->shadowLCR &=
1904             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1905         mos7840_port->shadowLCR |= (lData | lParity | lStop);
1906
1907         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1908                 mos7840_port->shadowLCR);
1909         /* Disable Interrupts */
1910         Data = 0x00;
1911         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1912
1913         Data = 0x00;
1914         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1915
1916         Data = 0xcf;
1917         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1918
1919         /* Send the updated LCR value to the mos7840 */
1920         Data = mos7840_port->shadowLCR;
1921
1922         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1923
1924         Data = 0x00b;
1925         mos7840_port->shadowMCR = Data;
1926         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1927         Data = 0x00b;
1928         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1929
1930         /* set up the MCR register and send it to the mos7840 */
1931
1932         mos7840_port->shadowMCR = MCR_MASTER_IE;
1933         if (cflag & CBAUD)
1934                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1935
1936         if (cflag & CRTSCTS)
1937                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1938         else
1939                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1940
1941         Data = mos7840_port->shadowMCR;
1942         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1943
1944         /* Determine divisor based on baud rate */
1945         baud = tty_get_baud_rate(tty);
1946
1947         if (!baud) {
1948                 /* pick a default, any default... */
1949                 dev_dbg(&port->dev, "%s", "Picked default baud...\n");
1950                 baud = 9600;
1951         }
1952
1953         dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1954         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
1955
1956         /* Enable Interrupts */
1957         Data = 0x0c;
1958         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1959
1960         if (mos7840_port->read_urb_busy == false) {
1961                 mos7840_port->read_urb_busy = true;
1962                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
1963                 if (status) {
1964                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1965                             status);
1966                         mos7840_port->read_urb_busy = false;
1967                 }
1968         }
1969         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
1970                 mos7840_port->shadowLCR);
1971 }
1972
1973 /*****************************************************************************
1974  * mos7840_set_termios
1975  *      this function is called by the tty driver when it wants to change
1976  *      the termios structure
1977  *****************************************************************************/
1978
1979 static void mos7840_set_termios(struct tty_struct *tty,
1980                                 struct usb_serial_port *port,
1981                                 struct ktermios *old_termios)
1982 {
1983         int status;
1984         unsigned int cflag;
1985         struct usb_serial *serial;
1986         struct moschip_port *mos7840_port;
1987
1988         if (mos7840_port_paranoia_check(port, __func__))
1989                 return;
1990
1991         serial = port->serial;
1992
1993         if (mos7840_serial_paranoia_check(serial, __func__))
1994                 return;
1995
1996         mos7840_port = mos7840_get_port_private(port);
1997
1998         if (mos7840_port == NULL)
1999                 return;
2000
2001         if (!mos7840_port->open) {
2002                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
2003                 return;
2004         }
2005
2006         dev_dbg(&port->dev, "%s", "setting termios - \n");
2007
2008         cflag = tty->termios.c_cflag;
2009
2010         dev_dbg(&port->dev, "%s - clfag %08x iflag %08x\n", __func__,
2011                 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
2012         dev_dbg(&port->dev, "%s - old clfag %08x old iflag %08x\n", __func__,
2013                 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2014
2015         /* change the port settings to the new ones specified */
2016
2017         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2018
2019         if (!mos7840_port->read_urb) {
2020                 dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n");
2021                 return;
2022         }
2023
2024         if (mos7840_port->read_urb_busy == false) {
2025                 mos7840_port->read_urb_busy = true;
2026                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2027                 if (status) {
2028                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
2029                             status);
2030                         mos7840_port->read_urb_busy = false;
2031                 }
2032         }
2033 }
2034
2035 /*****************************************************************************
2036  * mos7840_get_lsr_info - get line status register info
2037  *
2038  * Purpose: Let user call ioctl() to get info when the UART physically
2039  *          is emptied.  On bus types like RS485, the transmitter must
2040  *          release the bus after transmitting. This must be done when
2041  *          the transmit shift register is empty, not be done when the
2042  *          transmit holding register is empty.  This functionality
2043  *          allows an RS485 driver to be written in user space.
2044  *****************************************************************************/
2045
2046 static int mos7840_get_lsr_info(struct tty_struct *tty,
2047                                 unsigned int __user *value)
2048 {
2049         int count;
2050         unsigned int result = 0;
2051
2052         count = mos7840_chars_in_buffer(tty);
2053         if (count == 0)
2054                 result = TIOCSER_TEMT;
2055
2056         if (copy_to_user(value, &result, sizeof(int)))
2057                 return -EFAULT;
2058         return 0;
2059 }
2060
2061 /*****************************************************************************
2062  * mos7840_get_serial_info
2063  *      function to get information about serial port
2064  *****************************************************************************/
2065
2066 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2067                                    struct serial_struct __user *retinfo)
2068 {
2069         struct serial_struct tmp;
2070
2071         if (mos7840_port == NULL)
2072                 return -1;
2073
2074         if (!retinfo)
2075                 return -EFAULT;
2076
2077         memset(&tmp, 0, sizeof(tmp));
2078
2079         tmp.type = PORT_16550A;
2080         tmp.line = mos7840_port->port->minor;
2081         tmp.port = mos7840_port->port->port_number;
2082         tmp.irq = 0;
2083         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2084         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2085         tmp.baud_base = 9600;
2086         tmp.close_delay = 5 * HZ;
2087         tmp.closing_wait = 30 * HZ;
2088
2089         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2090                 return -EFAULT;
2091         return 0;
2092 }
2093
2094 /*****************************************************************************
2095  * SerialIoctl
2096  *      this function handles any ioctl calls to the driver
2097  *****************************************************************************/
2098
2099 static int mos7840_ioctl(struct tty_struct *tty,
2100                          unsigned int cmd, unsigned long arg)
2101 {
2102         struct usb_serial_port *port = tty->driver_data;
2103         void __user *argp = (void __user *)arg;
2104         struct moschip_port *mos7840_port;
2105
2106         if (mos7840_port_paranoia_check(port, __func__))
2107                 return -1;
2108
2109         mos7840_port = mos7840_get_port_private(port);
2110
2111         if (mos7840_port == NULL)
2112                 return -1;
2113
2114         dev_dbg(&port->dev, "%s - cmd = 0x%x\n", __func__, cmd);
2115
2116         switch (cmd) {
2117                 /* return number of bytes available */
2118
2119         case TIOCSERGETLSR:
2120                 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
2121                 return mos7840_get_lsr_info(tty, argp);
2122
2123         case TIOCGSERIAL:
2124                 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
2125                 return mos7840_get_serial_info(mos7840_port, argp);
2126
2127         case TIOCSSERIAL:
2128                 dev_dbg(&port->dev, "%s TIOCSSERIAL\n", __func__);
2129                 break;
2130         default:
2131                 break;
2132         }
2133         return -ENOIOCTLCMD;
2134 }
2135
2136 static int mos7810_check(struct usb_serial *serial)
2137 {
2138         int i, pass_count = 0;
2139         u8 *buf;
2140         __u16 data = 0, mcr_data = 0;
2141         __u16 test_pattern = 0x55AA;
2142         int res;
2143
2144         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2145         if (!buf)
2146                 return 0;       /* failed to identify 7810 */
2147
2148         /* Store MCR setting */
2149         res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2150                 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
2151                 buf, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2152         if (res == VENDOR_READ_LENGTH)
2153                 mcr_data = *buf;
2154
2155         for (i = 0; i < 16; i++) {
2156                 /* Send the 1-bit test pattern out to MCS7810 test pin */
2157                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2158                         MCS_WRREQ, MCS_WR_RTYPE,
2159                         (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
2160                         MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
2161
2162                 /* Read the test pattern back */
2163                 res = usb_control_msg(serial->dev,
2164                                 usb_rcvctrlpipe(serial->dev, 0), MCS_RDREQ,
2165                                 MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2166                                 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2167                 if (res == VENDOR_READ_LENGTH)
2168                         data = *buf;
2169
2170                 /* If this is a MCS7810 device, both test patterns must match */
2171                 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
2172                         break;
2173
2174                 pass_count++;
2175         }
2176
2177         /* Restore MCR setting */
2178         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
2179                 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
2180                 0, MOS_WDR_TIMEOUT);
2181
2182         kfree(buf);
2183
2184         if (pass_count == 16)
2185                 return 1;
2186
2187         return 0;
2188 }
2189
2190 static int mos7840_calc_num_ports(struct usb_serial *serial)
2191 {
2192         __u16 data = 0x00;
2193         u8 *buf;
2194         int mos7840_num_ports;
2195
2196         buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2197         if (buf) {
2198                 usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2199                         MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2200                         VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2201                 data = *buf;
2202                 kfree(buf);
2203         }
2204
2205         if (serial->dev->descriptor.idProduct == MOSCHIP_DEVICE_ID_7810 ||
2206                 serial->dev->descriptor.idProduct == MOSCHIP_DEVICE_ID_7820) {
2207                 device_type = serial->dev->descriptor.idProduct;
2208         } else {
2209                 /* For a MCS7840 device GPIO0 must be set to 1 */
2210                 if ((data & 0x01) == 1)
2211                         device_type = MOSCHIP_DEVICE_ID_7840;
2212                 else if (mos7810_check(serial))
2213                         device_type = MOSCHIP_DEVICE_ID_7810;
2214                 else
2215                         device_type = MOSCHIP_DEVICE_ID_7820;
2216         }
2217
2218         mos7840_num_ports = (device_type >> 4) & 0x000F;
2219         serial->num_bulk_in = mos7840_num_ports;
2220         serial->num_bulk_out = mos7840_num_ports;
2221         serial->num_ports = mos7840_num_ports;
2222
2223         return mos7840_num_ports;
2224 }
2225
2226 static int mos7840_port_probe(struct usb_serial_port *port)
2227 {
2228         struct usb_serial *serial = port->serial;
2229         struct moschip_port *mos7840_port;
2230         int status;
2231         int pnum;
2232         __u16 Data;
2233
2234         /* we set up the pointers to the endpoints in the mos7840_open *
2235          * function, as the structures aren't created yet.             */
2236
2237         pnum = port->port_number;
2238
2239         dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
2240         mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2241         if (mos7840_port == NULL) {
2242                 dev_err(&port->dev, "%s - Out of memory\n", __func__);
2243                 return -ENOMEM;
2244         }
2245
2246         /* Initialize all port interrupt end point to port 0 int
2247          * endpoint. Our device has only one interrupt end point
2248          * common to all port */
2249
2250         mos7840_port->port = port;
2251         mos7840_set_port_private(port, mos7840_port);
2252         spin_lock_init(&mos7840_port->pool_lock);
2253
2254         /* minor is not initialised until later by
2255          * usb-serial.c:get_free_serial() and cannot therefore be used
2256          * to index device instances */
2257         mos7840_port->port_num = pnum + 1;
2258         dev_dbg(&port->dev, "port->minor = %d\n", port->minor);
2259         dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
2260
2261         if (mos7840_port->port_num == 1) {
2262                 mos7840_port->SpRegOffset = 0x0;
2263                 mos7840_port->ControlRegOffset = 0x1;
2264                 mos7840_port->DcrRegOffset = 0x4;
2265         } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 4)) {
2266                 mos7840_port->SpRegOffset = 0x8;
2267                 mos7840_port->ControlRegOffset = 0x9;
2268                 mos7840_port->DcrRegOffset = 0x16;
2269         } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 2)) {
2270                 mos7840_port->SpRegOffset = 0xa;
2271                 mos7840_port->ControlRegOffset = 0xb;
2272                 mos7840_port->DcrRegOffset = 0x19;
2273         } else if ((mos7840_port->port_num == 3) && (serial->num_ports == 4)) {
2274                 mos7840_port->SpRegOffset = 0xa;
2275                 mos7840_port->ControlRegOffset = 0xb;
2276                 mos7840_port->DcrRegOffset = 0x19;
2277         } else if ((mos7840_port->port_num == 4) && (serial->num_ports == 4)) {
2278                 mos7840_port->SpRegOffset = 0xc;
2279                 mos7840_port->ControlRegOffset = 0xd;
2280                 mos7840_port->DcrRegOffset = 0x1c;
2281         }
2282         mos7840_dump_serial_port(port, mos7840_port);
2283         mos7840_set_port_private(port, mos7840_port);
2284
2285         /* enable rx_disable bit in control register */
2286         status = mos7840_get_reg_sync(port,
2287                         mos7840_port->ControlRegOffset, &Data);
2288         if (status < 0) {
2289                 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
2290                 goto out;
2291         } else
2292                 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
2293         Data |= 0x08;   /* setting driver done bit */
2294         Data |= 0x04;   /* sp1_bit to have cts change reflect in
2295                            modem status reg */
2296
2297         /* Data |= 0x20; //rx_disable bit */
2298         status = mos7840_set_reg_sync(port,
2299                         mos7840_port->ControlRegOffset, Data);
2300         if (status < 0) {
2301                 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2302                 goto out;
2303         } else
2304                 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
2305
2306         /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2307            and 0x24 in DCR3 */
2308         Data = 0x01;
2309         status = mos7840_set_reg_sync(port,
2310                         (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2311         if (status < 0) {
2312                 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
2313                 goto out;
2314         } else
2315                 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
2316
2317         Data = 0x05;
2318         status = mos7840_set_reg_sync(port,
2319                         (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2320         if (status < 0) {
2321                 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
2322                 goto out;
2323         } else
2324                 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
2325
2326         Data = 0x24;
2327         status = mos7840_set_reg_sync(port,
2328                         (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2329         if (status < 0) {
2330                 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
2331                 goto out;
2332         } else
2333                 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
2334
2335         /* write values in clkstart0x0 and clkmulti 0x20 */
2336         Data = 0x0;
2337         status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
2338         if (status < 0) {
2339                 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2340                 goto out;
2341         } else
2342                 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2343
2344         Data = 0x20;
2345         status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
2346         if (status < 0) {
2347                 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
2348                 goto error;
2349         } else
2350                 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
2351
2352         /* write value 0x0 to scratchpad register */
2353         Data = 0x00;
2354         status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
2355         if (status < 0) {
2356                 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
2357                 goto out;
2358         } else
2359                 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
2360
2361         /* Zero Length flag register */
2362         if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
2363                 Data = 0xff;
2364                 status = mos7840_set_reg_sync(port,
2365                                 (__u16) (ZLP_REG1 +
2366                                         ((__u16)mos7840_port->port_num)), Data);
2367                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2368                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
2369                 if (status < 0) {
2370                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
2371                         goto out;
2372                 } else
2373                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
2374         } else {
2375                 Data = 0xff;
2376                 status = mos7840_set_reg_sync(port,
2377                                 (__u16) (ZLP_REG1 +
2378                                         ((__u16)mos7840_port->port_num) - 0x1), Data);
2379                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2380                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
2381                 if (status < 0) {
2382                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
2383                         goto out;
2384                 } else
2385                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
2386
2387         }
2388         mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2389         mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2390         mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2391                         GFP_KERNEL);
2392         if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2393                         !mos7840_port->dr) {
2394                 status = -ENOMEM;
2395                 goto error;
2396         }
2397
2398         mos7840_port->has_led = false;
2399
2400         /* Initialize LED timers */
2401         if (device_type == MOSCHIP_DEVICE_ID_7810) {
2402                 mos7840_port->has_led = true;
2403
2404                 init_timer(&mos7840_port->led_timer1);
2405                 mos7840_port->led_timer1.function = mos7840_led_off;
2406                 mos7840_port->led_timer1.expires =
2407                         jiffies + msecs_to_jiffies(LED_ON_MS);
2408                 mos7840_port->led_timer1.data = (unsigned long)mos7840_port;
2409
2410                 init_timer(&mos7840_port->led_timer2);
2411                 mos7840_port->led_timer2.function = mos7840_led_flag_off;
2412                 mos7840_port->led_timer2.expires =
2413                         jiffies + msecs_to_jiffies(LED_OFF_MS);
2414                 mos7840_port->led_timer2.data = (unsigned long)mos7840_port;
2415
2416                 mos7840_port->led_flag = false;
2417
2418                 /* Turn off LED */
2419                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2420         }
2421 out:
2422         if (pnum == serial->num_ports - 1) {
2423                 /* Zero Length flag enable */
2424                 Data = 0x0f;
2425                 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2426                 if (status < 0) {
2427                         dev_dbg(&port->dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
2428                         goto error;
2429                 } else
2430                         dev_dbg(&port->dev, "ZLP_REG5 Writing success status%d\n", status);
2431
2432                 /* setting configuration feature to one */
2433                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2434                                 0x03, 0x00, 0x01, 0x00, NULL, 0x00,
2435                                 MOS_WDR_TIMEOUT);
2436         }
2437         return 0;
2438 error:
2439         kfree(mos7840_port->dr);
2440         kfree(mos7840_port->ctrl_buf);
2441         usb_free_urb(mos7840_port->control_urb);
2442         kfree(mos7840_port);
2443
2444         return status;
2445 }
2446
2447 static int mos7840_port_remove(struct usb_serial_port *port)
2448 {
2449         struct moschip_port *mos7840_port;
2450
2451         mos7840_port = mos7840_get_port_private(port);
2452
2453         if (mos7840_port->has_led) {
2454                 /* Turn off LED */
2455                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2456
2457                 del_timer_sync(&mos7840_port->led_timer1);
2458                 del_timer_sync(&mos7840_port->led_timer2);
2459         }
2460         usb_kill_urb(mos7840_port->control_urb);
2461         usb_free_urb(mos7840_port->control_urb);
2462         kfree(mos7840_port->ctrl_buf);
2463         kfree(mos7840_port->dr);
2464         kfree(mos7840_port);
2465
2466         return 0;
2467 }
2468
2469 static struct usb_serial_driver moschip7840_4port_device = {
2470         .driver = {
2471                    .owner = THIS_MODULE,
2472                    .name = "mos7840",
2473                    },
2474         .description = DRIVER_DESC,
2475         .id_table = id_table,
2476         .num_ports = 4,
2477         .open = mos7840_open,
2478         .close = mos7840_close,
2479         .write = mos7840_write,
2480         .write_room = mos7840_write_room,
2481         .chars_in_buffer = mos7840_chars_in_buffer,
2482         .throttle = mos7840_throttle,
2483         .unthrottle = mos7840_unthrottle,
2484         .calc_num_ports = mos7840_calc_num_ports,
2485 #ifdef MCSSerialProbe
2486         .probe = mos7840_serial_probe,
2487 #endif
2488         .ioctl = mos7840_ioctl,
2489         .set_termios = mos7840_set_termios,
2490         .break_ctl = mos7840_break,
2491         .tiocmget = mos7840_tiocmget,
2492         .tiocmset = mos7840_tiocmset,
2493         .tiocmiwait = usb_serial_generic_tiocmiwait,
2494         .get_icount = usb_serial_generic_get_icount,
2495         .port_probe = mos7840_port_probe,
2496         .port_remove = mos7840_port_remove,
2497         .read_bulk_callback = mos7840_bulk_in_callback,
2498         .read_int_callback = mos7840_interrupt_callback,
2499 };
2500
2501 static struct usb_serial_driver * const serial_drivers[] = {
2502         &moschip7840_4port_device, NULL
2503 };
2504
2505 module_usb_serial_driver(serial_drivers, id_table);
2506
2507 MODULE_DESCRIPTION(DRIVER_DESC);
2508 MODULE_LICENSE("GPL");