Pileus Git - ~andy/linux/blob - drivers/usb/serial/mos7840.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  15  *
  16  * Clean ups from Moschip version and a few ioctl implementations by:
  17  *      Paul B Schroeder <pschroeder "at" uplogix "dot" com>
  18  *
  19  * Originally based on drivers/usb/serial/io_edgeport.c which is:
  20  *      Copyright (C) 2000 Inside Out Networks, All rights reserved.
  21  *      Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
  22  *
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/errno.h>
  27 #include <linux/init.h>
  28 #include <linux/slab.h>
  29 #include <linux/tty.h>
  30 #include <linux/tty_driver.h>
  31 #include <linux/tty_flip.h>
  32 #include <linux/module.h>
  33 #include <linux/serial.h>
  34 #include <linux/usb.h>
  35 #include <linux/usb/serial.h>
  36 #include <linux/uaccess.h>
  37
  38 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
  39
  40 /*
  41  * 16C50 UART register defines
  42  */
  43
  44 #define LCR_BITS_5             0x00     /* 5 bits/char */
  45 #define LCR_BITS_6             0x01     /* 6 bits/char */
  46 #define LCR_BITS_7             0x02     /* 7 bits/char */
  47 #define LCR_BITS_8             0x03     /* 8 bits/char */
  48 #define LCR_BITS_MASK          0x03     /* Mask for bits/char field */
  49
  50 #define LCR_STOP_1             0x00     /* 1 stop bit */
  51 #define LCR_STOP_1_5           0x04     /* 1.5 stop bits (if 5   bits/char) */
  52 #define LCR_STOP_2             0x04     /* 2 stop bits   (if 6-8 bits/char) */
  53 #define LCR_STOP_MASK          0x04     /* Mask for stop bits field */
  54
  55 #define LCR_PAR_NONE           0x00     /* No parity */
  56 #define LCR_PAR_ODD            0x08     /* Odd parity */
  57 #define LCR_PAR_EVEN           0x18     /* Even parity */
  58 #define LCR_PAR_MARK           0x28     /* Force parity bit to 1 */
  59 #define LCR_PAR_SPACE          0x38     /* Force parity bit to 0 */
  60 #define LCR_PAR_MASK           0x38     /* Mask for parity field */
  61
  62 #define LCR_SET_BREAK          0x40     /* Set Break condition */
  63 #define LCR_DL_ENABLE          0x80     /* Enable access to divisor latch */
  64
  65 #define MCR_DTR                0x01     /* Assert DTR */
  66 #define MCR_RTS                0x02     /* Assert RTS */
  67 #define MCR_OUT1               0x04     /* Loopback only: Sets state of RI */
  68 #define MCR_MASTER_IE          0x08     /* Enable interrupt outputs */
  69 #define MCR_LOOPBACK           0x10     /* Set internal (digital) loopback mode */
  70 #define MCR_XON_ANY            0x20     /* Enable any char to exit XOFF mode */
  71
  72 #define MOS7840_MSR_CTS        0x10     /* Current state of CTS */
  73 #define MOS7840_MSR_DSR        0x20     /* Current state of DSR */
  74 #define MOS7840_MSR_RI         0x40     /* Current state of RI */
  75 #define MOS7840_MSR_CD         0x80     /* Current state of CD */
  76
  77 /*
  78  * Defines used for sending commands to port
  79  */
  80
  81 #define MOS_WDR_TIMEOUT         5000    /* default urb timeout */
  82
  83 #define MOS_PORT1       0x0200
  84 #define MOS_PORT2       0x0300
  85 #define MOS_VENREG      0x0000
  86 #define MOS_MAX_PORT    0x02
  87 #define MOS_WRITE       0x0E
  88 #define MOS_READ        0x0D
  89
  90 /* Requests */
  91 #define MCS_RD_RTYPE    0xC0
  92 #define MCS_WR_RTYPE    0x40
  93 #define MCS_RDREQ       0x0D
  94 #define MCS_WRREQ       0x0E
  95 #define MCS_CTRL_TIMEOUT        500
  96 #define VENDOR_READ_LENGTH      (0x01)
  97
  98 #define MAX_NAME_LEN    64
  99
 100 #define ZLP_REG1  0x3A          /* Zero_Flag_Reg1    58 */
 101 #define ZLP_REG5  0x3E          /* Zero_Flag_Reg5    62 */
 102
 103 /* For higher baud Rates use TIOCEXBAUD */
 104 #define TIOCEXBAUD     0x5462
 105
 106 /* vendor id and device id defines */
 107
 108 /* The native mos7840/7820 component */
 109 #define USB_VENDOR_ID_MOSCHIP           0x9710
 110 #define MOSCHIP_DEVICE_ID_7840          0x7840
 111 #define MOSCHIP_DEVICE_ID_7820          0x7820
 112 #define MOSCHIP_DEVICE_ID_7810          0x7810
 113 /* The native component can have its vendor/device id's overridden
 114  * in vendor-specific implementations.  Such devices can be handled
 115  * by making a change here, in id_table.
 116  */
 117 #define USB_VENDOR_ID_BANDB              0x0856
 118 #define BANDB_DEVICE_ID_USO9ML2_2        0xAC22
 119 #define BANDB_DEVICE_ID_USO9ML2_2P       0xBC00
 120 #define BANDB_DEVICE_ID_USO9ML2_4        0xAC24
 121 #define BANDB_DEVICE_ID_USO9ML2_4P       0xBC01
 122 #define BANDB_DEVICE_ID_US9ML2_2         0xAC29
 123 #define BANDB_DEVICE_ID_US9ML2_4         0xAC30
 124 #define BANDB_DEVICE_ID_USPTL4_2         0xAC31
 125 #define BANDB_DEVICE_ID_USPTL4_4         0xAC32
 126 #define BANDB_DEVICE_ID_USOPTL4_2        0xAC42
 127 #define BANDB_DEVICE_ID_USOPTL4_2P       0xBC02
 128 #define BANDB_DEVICE_ID_USOPTL4_4        0xAC44
 129 #define BANDB_DEVICE_ID_USOPTL4_4P       0xBC03
 130 #define BANDB_DEVICE_ID_USOPTL2_4        0xAC24
 131
 132 /* This driver also supports
 133  * ATEN UC2324 device using Moschip MCS7840
 134  * ATEN UC2322 device using Moschip MCS7820
 135  */
 136 #define USB_VENDOR_ID_ATENINTL          0x0557
 137 #define ATENINTL_DEVICE_ID_UC2324       0x2011
 138 #define ATENINTL_DEVICE_ID_UC2322       0x7820
 139
 140 /* Interrupt Routine Defines    */
 141
 142 #define SERIAL_IIR_RLS      0x06
 143 #define SERIAL_IIR_MS       0x00
 144
 145 /*
 146  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 147  */
 148 #define SERIAL_LSR_DR       0x0001
 149 #define SERIAL_LSR_OE       0x0002
 150 #define SERIAL_LSR_PE       0x0004
 151 #define SERIAL_LSR_FE       0x0008
 152 #define SERIAL_LSR_BI       0x0010
 153
 154 #define MOS_MSR_DELTA_CTS   0x10
 155 #define MOS_MSR_DELTA_DSR   0x20
 156 #define MOS_MSR_DELTA_RI    0x40
 157 #define MOS_MSR_DELTA_CD    0x80
 158
 159 /* Serial Port register Address */
 160 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 161 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 162 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 163 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 164 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 165 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 166 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 167 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 168 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 169
 170 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 171 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 172 #define GPIO_REGISTER              ((__u16)(0x07))
 173
 174 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 175
 176 /*
 177  * URB POOL related defines
 178  */
 179 #define NUM_URBS                        16      /* URB Count */
 180 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 181
 182 /* LED on/off milliseconds*/
 183 #define LED_ON_MS       500
 184 #define LED_OFF_MS      500
 185
 186 enum mos7840_flag {
 187         MOS7840_FLAG_CTRL_BUSY,
 188         MOS7840_FLAG_LED_BUSY,
 189 };
 190
 191 static const struct usb_device_id id_table[] = {
 192         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 193         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 194         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
 195         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
 196         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
 197         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 198         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
 199         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 200         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 201         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 202         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 203         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 204         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
 205         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 206         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
 207         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
 208         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 209         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 210         {}                      /* terminating entry */
 211 };
 212 MODULE_DEVICE_TABLE(usb, id_table);
 213
 214 /* This structure holds all of the local port information */
 215
 216 struct moschip_port {
 217         int port_num;           /*Actual port number in the device(1,2,etc) */
 218         struct urb *write_urb;  /* write URB for this port */
 219         struct urb *read_urb;   /* read URB for this port */
 220         __u8 shadowLCR;         /* last LCR value received */
 221         __u8 shadowMCR;         /* last MCR value received */
 222         char open;
 223         char open_ports;
 224         struct usb_serial_port *port;   /* loop back to the owner of this object */
 225
 226         /* Offsets */
 227         __u8 SpRegOffset;
 228         __u8 ControlRegOffset;
 229         __u8 DcrRegOffset;
 230         /* for processing control URBS in interrupt context */
 231         struct urb *control_urb;
 232         struct usb_ctrlrequest *dr;
 233         char *ctrl_buf;
 234         int MsrLsr;
 235
 236         spinlock_t pool_lock;
 237         struct urb *write_urb_pool[NUM_URBS];
 238         char busy[NUM_URBS];
 239         bool read_urb_busy;
 240
 241         /* For device(s) with LED indicator */
 242         bool has_led;
 243         struct timer_list led_timer1;   /* Timer for LED on */
 244         struct timer_list led_timer2;   /* Timer for LED off */
 245         struct urb *led_urb;
 246         struct usb_ctrlrequest *led_dr;
 247
 248         unsigned long flags;
 249 };
 250
 251 /*
 252  * mos7840_set_reg_sync
 253  *      To set the Control register by calling usb_fill_control_urb function
 254  *      by passing usb_sndctrlpipe function as parameter.
 255  */
 256
 257 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 258                                 __u16 val)
 259 {
 260         struct usb_device *dev = port->serial->dev;
 261         val = val & 0x00ff;
 262         dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
 263
 264         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 265                                MCS_WR_RTYPE, val, reg, NULL, 0,
 266                                MOS_WDR_TIMEOUT);
 267 }
 268
 269 /*
 270  * mos7840_get_reg_sync
 271  *      To set the Uart register by calling usb_fill_control_urb function by
 272  *      passing usb_rcvctrlpipe function as parameter.
 273  */
 274
 275 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 276                                 __u16 *val)
 277 {
 278         struct usb_device *dev = port->serial->dev;
 279         int ret = 0;
 280         u8 *buf;
 281
 282         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 283         if (!buf)
 284                 return -ENOMEM;
 285
 286         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 287                               MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
 288                               MOS_WDR_TIMEOUT);
 289         *val = buf[0];
 290         dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
 291
 292         kfree(buf);
 293         return ret;
 294 }
 295
 296 /*
 297  * mos7840_set_uart_reg
 298  *      To set the Uart register by calling usb_fill_control_urb function by
 299  *      passing usb_sndctrlpipe function as parameter.
 300  */
 301
 302 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 303                                 __u16 val)
 304 {
 305
 306         struct usb_device *dev = port->serial->dev;
 307         val = val & 0x00ff;
 308         /* For the UART control registers, the application number need
 309            to be Or'ed */
 310         if (port->serial->num_ports == 4) {
 311                 val |= ((__u16)port->port_number + 1) << 8;
 312         } else {
 313                 if (port->port_number == 0) {
 314                         val |= ((__u16)port->port_number + 1) << 8;
 315                 } else {
 316                         val |= ((__u16)port->port_number + 2) << 8;
 317                 }
 318         }
 319         dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
 320         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 321                                MCS_WR_RTYPE, val, reg, NULL, 0,
 322                                MOS_WDR_TIMEOUT);
 323
 324 }
 325
 326 /*
 327  * mos7840_get_uart_reg
 328  *      To set the Control register by calling usb_fill_control_urb function
 329  *      by passing usb_rcvctrlpipe function as parameter.
 330  */
 331 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 332                                 __u16 *val)
 333 {
 334         struct usb_device *dev = port->serial->dev;
 335         int ret = 0;
 336         __u16 Wval;
 337         u8 *buf;
 338
 339         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 340         if (!buf)
 341                 return -ENOMEM;
 342
 343         /* Wval  is same as application number */
 344         if (port->serial->num_ports == 4) {
 345                 Wval = ((__u16)port->port_number + 1) << 8;
 346         } else {
 347                 if (port->port_number == 0) {
 348                         Wval = ((__u16)port->port_number + 1) << 8;
 349                 } else {
 350                         Wval = ((__u16)port->port_number + 2) << 8;
 351                 }
 352         }
 353         dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
 354         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 355                               MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
 356                               MOS_WDR_TIMEOUT);
 357         *val = buf[0];
 358
 359         kfree(buf);
 360         return ret;
 361 }
 362
 363 static void mos7840_dump_serial_port(struct usb_serial_port *port,
 364                                      struct moschip_port *mos7840_port)
 365 {
 366
 367         dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
 368         dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
 369         dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
 370
 371 }
 372
 373 /************************************************************************/
 374 /************************************************************************/
 375 /*             I N T E R F A C E   F U N C T I O N S                    */
 376 /*             I N T E R F A C E   F U N C T I O N S                    */
 377 /************************************************************************/
 378 /************************************************************************/
 379
 380 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 381                                             struct moschip_port *data)
 382 {
 383         usb_set_serial_port_data(port, (void *)data);
 384 }
 385
 386 static inline struct moschip_port *mos7840_get_port_private(struct
 387                                                             usb_serial_port
 388                                                             *port)
 389 {
 390         return (struct moschip_port *)usb_get_serial_port_data(port);
 391 }
 392
 393 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 394 {
 395         struct moschip_port *mos7840_port;
 396         struct async_icount *icount;
 397         mos7840_port = port;
 398         if (new_msr &
 399             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 400              MOS_MSR_DELTA_CD)) {
 401                 icount = &mos7840_port->port->icount;
 402
 403                 /* update input line counters */
 404                 if (new_msr & MOS_MSR_DELTA_CTS)
 405                         icount->cts++;
 406                 if (new_msr & MOS_MSR_DELTA_DSR)
 407                         icount->dsr++;
 408                 if (new_msr & MOS_MSR_DELTA_CD)
 409                         icount->dcd++;
 410                 if (new_msr & MOS_MSR_DELTA_RI)
 411                         icount->rng++;
 412
 413                 wake_up_interruptible(&port->port->port.delta_msr_wait);
 414         }
 415 }
 416
 417 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 418 {
 419         struct async_icount *icount;
 420
 421         if (new_lsr & SERIAL_LSR_BI) {
 422                 /*
 423                  * Parity and Framing errors only count if they
 424                  * occur exclusive of a break being
 425                  * received.
 426                  */
 427                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 428         }
 429
 430         /* update input line counters */
 431         icount = &port->port->icount;
 432         if (new_lsr & SERIAL_LSR_BI)
 433                 icount->brk++;
 434         if (new_lsr & SERIAL_LSR_OE)
 435                 icount->overrun++;
 436         if (new_lsr & SERIAL_LSR_PE)
 437                 icount->parity++;
 438         if (new_lsr & SERIAL_LSR_FE)
 439                 icount->frame++;
 440 }
 441
 442 /************************************************************************/
 443 /************************************************************************/
 444 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 445 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 446 /************************************************************************/
 447 /************************************************************************/
 448
 449 static void mos7840_control_callback(struct urb *urb)
 450 {
 451         unsigned char *data;
 452         struct moschip_port *mos7840_port;
 453         struct device *dev = &urb->dev->dev;
 454         __u8 regval = 0x0;
 455         int status = urb->status;
 456
 457         mos7840_port = urb->context;
 458
 459         switch (status) {
 460         case 0:
 461                 /* success */
 462                 break;
 463         case -ECONNRESET:
 464         case -ENOENT:
 465         case -ESHUTDOWN:
 466                 /* this urb is terminated, clean up */
 467                 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
 468                 goto out;
 469         default:
 470                 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
 471                 goto out;
 472         }
 473
 474         dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length);
 475         dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__,
 476                 mos7840_port->MsrLsr, mos7840_port->port_num);
 477         data = urb->transfer_buffer;
 478         regval = (__u8) data[0];
 479         dev_dbg(dev, "%s data is %x\n", __func__, regval);
 480         if (mos7840_port->MsrLsr == 0)
 481                 mos7840_handle_new_msr(mos7840_port, regval);
 482         else if (mos7840_port->MsrLsr == 1)
 483                 mos7840_handle_new_lsr(mos7840_port, regval);
 484 out:
 485         clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mos7840_port->flags);
 486 }
 487
 488 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 489                            __u16 *val)
 490 {
 491         struct usb_device *dev = mcs->port->serial->dev;
 492         struct usb_ctrlrequest *dr = mcs->dr;
 493         unsigned char *buffer = mcs->ctrl_buf;
 494         int ret;
 495
 496         if (test_and_set_bit_lock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags))
 497                 return -EBUSY;
 498
 499         dr->bRequestType = MCS_RD_RTYPE;
 500         dr->bRequest = MCS_RDREQ;
 501         dr->wValue = cpu_to_le16(Wval); /* 0 */
 502         dr->wIndex = cpu_to_le16(reg);
 503         dr->wLength = cpu_to_le16(2);
 504
 505         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 506                              (unsigned char *)dr, buffer, 2,
 507                              mos7840_control_callback, mcs);
 508         mcs->control_urb->transfer_buffer_length = 2;
 509         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 510         if (ret)
 511                 clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags);
 512
 513         return ret;
 514 }
 515
 516 static void mos7840_set_led_callback(struct urb *urb)
 517 {
 518         switch (urb->status) {
 519         case 0:
 520                 /* Success */
 521                 break;
 522         case -ECONNRESET:
 523         case -ENOENT:
 524         case -ESHUTDOWN:
 525                 /* This urb is terminated, clean up */
 526                 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d",
 527                         __func__, urb->status);
 528                 break;
 529         default:
 530                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d",
 531                         __func__, urb->status);
 532         }
 533 }
 534
 535 static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
 536                                 __u16 reg)
 537 {
 538         struct usb_device *dev = mcs->port->serial->dev;
 539         struct usb_ctrlrequest *dr = mcs->led_dr;
 540
 541         dr->bRequestType = MCS_WR_RTYPE;
 542         dr->bRequest = MCS_WRREQ;
 543         dr->wValue = cpu_to_le16(wval);
 544         dr->wIndex = cpu_to_le16(reg);
 545         dr->wLength = cpu_to_le16(0);
 546
 547         usb_fill_control_urb(mcs->led_urb, dev, usb_sndctrlpipe(dev, 0),
 548                 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
 549
 550         usb_submit_urb(mcs->led_urb, GFP_ATOMIC);
 551 }
 552
 553 static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
 554                                 __u16 val)
 555 {
 556         struct usb_device *dev = port->serial->dev;
 557
 558         usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
 559                         val, reg, NULL, 0, MOS_WDR_TIMEOUT);
 560 }
 561
 562 static void mos7840_led_off(unsigned long arg)
 563 {
 564         struct moschip_port *mcs = (struct moschip_port *) arg;
 565
 566         /* Turn off LED */
 567         mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
 568         mod_timer(&mcs->led_timer2,
 569                                 jiffies + msecs_to_jiffies(LED_OFF_MS));
 570 }
 571
 572 static void mos7840_led_flag_off(unsigned long arg)
 573 {
 574         struct moschip_port *mcs = (struct moschip_port *) arg;
 575
 576         clear_bit_unlock(MOS7840_FLAG_LED_BUSY, &mcs->flags);
 577 }
 578
 579 static void mos7840_led_activity(struct usb_serial_port *port)
 580 {
 581         struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
 582
 583         if (test_and_set_bit_lock(MOS7840_FLAG_LED_BUSY, &mos7840_port->flags))
 584                 return;
 585
 586         mos7840_set_led_async(mos7840_port, 0x0301, MODEM_CONTROL_REGISTER);
 587         mod_timer(&mos7840_port->led_timer1,
 588                                 jiffies + msecs_to_jiffies(LED_ON_MS));
 589 }
 590
 591 /*****************************************************************************
 592  * mos7840_interrupt_callback
 593  *      this is the callback function for when we have received data on the
 594  *      interrupt endpoint.
 595  *****************************************************************************/
 596
 597 static void mos7840_interrupt_callback(struct urb *urb)
 598 {
 599         int result;
 600         int length;
 601         struct moschip_port *mos7840_port;
 602         struct usb_serial *serial;
 603         __u16 Data;
 604         unsigned char *data;
 605         __u8 sp[5], st;
 606         int i, rv = 0;
 607         __u16 wval, wreg = 0;
 608         int status = urb->status;
 609
 610         switch (status) {
 611         case 0:
 612                 /* success */
 613                 break;
 614         case -ECONNRESET:
 615         case -ENOENT:
 616         case -ESHUTDOWN:
 617                 /* this urb is terminated, clean up */
 618                 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
 619                         __func__, status);
 620                 return;
 621         default:
 622                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
 623                         __func__, status);
 624                 goto exit;
 625         }
 626
 627         length = urb->actual_length;
 628         data = urb->transfer_buffer;
 629
 630         serial = urb->context;
 631
 632         /* Moschip get 5 bytes
 633          * Byte 1 IIR Port 1 (port.number is 0)
 634          * Byte 2 IIR Port 2 (port.number is 1)
 635          * Byte 3 IIR Port 3 (port.number is 2)
 636          * Byte 4 IIR Port 4 (port.number is 3)
 637          * Byte 5 FIFO status for both */
 638
 639         if (length && length > 5) {
 640                 dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n");
 641                 return;
 642         }
 643
 644         sp[0] = (__u8) data[0];
 645         sp[1] = (__u8) data[1];
 646         sp[2] = (__u8) data[2];
 647         sp[3] = (__u8) data[3];
 648         st = (__u8) data[4];
 649
 650         for (i = 0; i < serial->num_ports; i++) {
 651                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 652                 wval = ((__u16)serial->port[i]->port_number + 1) << 8;
 653                 if (mos7840_port->open) {
 654                         if (sp[i] & 0x01) {
 655                                 dev_dbg(&urb->dev->dev, "SP%d No Interrupt !!!\n", i);
 656                         } else {
 657                                 switch (sp[i] & 0x0f) {
 658                                 case SERIAL_IIR_RLS:
 659                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Receiver status error or \n", i);
 660                                         dev_dbg(&urb->dev->dev, "address bit detected in 9-bit mode\n");
 661                                         mos7840_port->MsrLsr = 1;
 662                                         wreg = LINE_STATUS_REGISTER;
 663                                         break;
 664                                 case SERIAL_IIR_MS:
 665                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Modem status change\n", i);
 666                                         mos7840_port->MsrLsr = 0;
 667                                         wreg = MODEM_STATUS_REGISTER;
 668                                         break;
 669                                 }
 670                                 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 671                         }
 672                 }
 673         }
 674         if (!(rv < 0))
 675                 /* the completion handler for the control urb will resubmit */
 676                 return;
 677 exit:
 678         result = usb_submit_urb(urb, GFP_ATOMIC);
 679         if (result) {
 680                 dev_err(&urb->dev->dev,
 681                         "%s - Error %d submitting interrupt urb\n",
 682                         __func__, result);
 683         }
 684 }
 685
 686 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 687                                        const char *function)
 688 {
 689         if (!port) {
 690                 pr_debug("%s - port == NULL\n", function);
 691                 return -1;
 692         }
 693         if (!port->serial) {
 694                 pr_debug("%s - port->serial == NULL\n", function);
 695                 return -1;
 696         }
 697
 698         return 0;
 699 }
 700
 701 /* Inline functions to check the sanity of a pointer that is passed to us */
 702 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 703                                          const char *function)
 704 {
 705         if (!serial) {
 706                 pr_debug("%s - serial == NULL\n", function);
 707                 return -1;
 708         }
 709         if (!serial->type) {
 710                 pr_debug("%s - serial->type == NULL!\n", function);
 711                 return -1;
 712         }
 713
 714         return 0;
 715 }
 716
 717 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 718                                                  const char *function)
 719 {
 720         /* if no port was specified, or it fails a paranoia check */
 721         if (!port ||
 722             mos7840_port_paranoia_check(port, function) ||
 723             mos7840_serial_paranoia_check(port->serial, function)) {
 724                 /* then say that we don't have a valid usb_serial thing,
 725                  * which will end up genrating -ENODEV return values */
 726                 return NULL;
 727         }
 728
 729         return port->serial;
 730 }
 731
 732 /*****************************************************************************
 733  * mos7840_bulk_in_callback
 734  *      this is the callback function for when we have received data on the
 735  *      bulk in endpoint.
 736  *****************************************************************************/
 737
 738 static void mos7840_bulk_in_callback(struct urb *urb)
 739 {
 740         int retval;
 741         unsigned char *data;
 742         struct usb_serial *serial;
 743         struct usb_serial_port *port;
 744         struct moschip_port *mos7840_port;
 745         int status = urb->status;
 746
 747         mos7840_port = urb->context;
 748         if (!mos7840_port)
 749                 return;
 750
 751         if (status) {
 752                 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
 753                 mos7840_port->read_urb_busy = false;
 754                 return;
 755         }
 756
 757         port = mos7840_port->port;
 758         if (mos7840_port_paranoia_check(port, __func__)) {
 759                 mos7840_port->read_urb_busy = false;
 760                 return;
 761         }
 762
 763         serial = mos7840_get_usb_serial(port, __func__);
 764         if (!serial) {
 765                 mos7840_port->read_urb_busy = false;
 766                 return;
 767         }
 768
 769         data = urb->transfer_buffer;
 770         usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
 771
 772         if (urb->actual_length) {
 773                 struct tty_port *tport = &mos7840_port->port->port;
 774                 tty_insert_flip_string(tport, data, urb->actual_length);
 775                 tty_flip_buffer_push(tport);
 776                 port->icount.rx += urb->actual_length;
 777                 dev_dbg(&port->dev, "icount.rx is %d:\n", port->icount.rx);
 778         }
 779
 780         if (!mos7840_port->read_urb) {
 781                 dev_dbg(&port->dev, "%s", "URB KILLED !!!\n");
 782                 mos7840_port->read_urb_busy = false;
 783                 return;
 784         }
 785
 786         if (mos7840_port->has_led)
 787                 mos7840_led_activity(port);
 788
 789         mos7840_port->read_urb_busy = true;
 790         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 791
 792         if (retval) {
 793                 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
 794                 mos7840_port->read_urb_busy = false;
 795         }
 796 }
 797
 798 /*****************************************************************************
 799  * mos7840_bulk_out_data_callback
 800  *      this is the callback function for when we have finished sending
 801  *      serial data on the bulk out endpoint.
 802  *****************************************************************************/
 803
 804 static void mos7840_bulk_out_data_callback(struct urb *urb)
 805 {
 806         struct moschip_port *mos7840_port;
 807         struct usb_serial_port *port;
 808         int status = urb->status;
 809         int i;
 810
 811         mos7840_port = urb->context;
 812         port = mos7840_port->port;
 813         spin_lock(&mos7840_port->pool_lock);
 814         for (i = 0; i < NUM_URBS; i++) {
 815                 if (urb == mos7840_port->write_urb_pool[i]) {
 816                         mos7840_port->busy[i] = 0;
 817                         break;
 818                 }
 819         }
 820         spin_unlock(&mos7840_port->pool_lock);
 821
 822         if (status) {
 823                 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
 824                 return;
 825         }
 826
 827         if (mos7840_port_paranoia_check(port, __func__))
 828                 return;
 829
 830         if (mos7840_port->open)
 831                 tty_port_tty_wakeup(&port->port);
 832
 833 }
 834
 835 /************************************************************************/
 836 /*       D R I V E R  T T Y  I N T E R F A C E  F U N C T I O N S       */
 837 /************************************************************************/
 838
 839 /*****************************************************************************
 840  * mos7840_open
 841  *      this function is called by the tty driver when a port is opened
 842  *      If successful, we return 0
 843  *      Otherwise we return a negative error number.
 844  *****************************************************************************/
 845
 846 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
 847 {
 848         int response;
 849         int j;
 850         struct usb_serial *serial;
 851         struct urb *urb;
 852         __u16 Data;
 853         int status;
 854         struct moschip_port *mos7840_port;
 855         struct moschip_port *port0;
 856
 857         if (mos7840_port_paranoia_check(port, __func__))
 858                 return -ENODEV;
 859
 860         serial = port->serial;
 861
 862         if (mos7840_serial_paranoia_check(serial, __func__))
 863                 return -ENODEV;
 864
 865         mos7840_port = mos7840_get_port_private(port);
 866         port0 = mos7840_get_port_private(serial->port[0]);
 867
 868         if (mos7840_port == NULL || port0 == NULL)
 869                 return -ENODEV;
 870
 871         usb_clear_halt(serial->dev, port->write_urb->pipe);
 872         usb_clear_halt(serial->dev, port->read_urb->pipe);
 873         port0->open_ports++;
 874
 875         /* Initialising the write urb pool */
 876         for (j = 0; j < NUM_URBS; ++j) {
 877                 urb = usb_alloc_urb(0, GFP_KERNEL);
 878                 mos7840_port->write_urb_pool[j] = urb;
 879
 880                 if (urb == NULL) {
 881                         dev_err(&port->dev, "No more urbs???\n");
 882                         continue;
 883                 }
 884
 885                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 886                                                                 GFP_KERNEL);
 887                 if (!urb->transfer_buffer) {
 888                         usb_free_urb(urb);
 889                         mos7840_port->write_urb_pool[j] = NULL;
 890                         dev_err(&port->dev,
 891                                 "%s-out of memory for urb buffers.\n",
 892                                 __func__);
 893                         continue;
 894                 }
 895         }
 896
 897 /*****************************************************************************
 898  * Initialize MCS7840 -- Write Init values to corresponding Registers
 899  *
 900  * Register Index
 901  * 1 : IER
 902  * 2 : FCR
 903  * 3 : LCR
 904  * 4 : MCR
 905  *
 906  * 0x08 : SP1/2 Control Reg
 907  *****************************************************************************/
 908
 909         /* NEED to check the following Block */
 910
 911         Data = 0x0;
 912         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 913         if (status < 0) {
 914                 dev_dbg(&port->dev, "Reading Spreg failed\n");
 915                 goto err;
 916         }
 917         Data |= 0x80;
 918         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 919         if (status < 0) {
 920                 dev_dbg(&port->dev, "writing Spreg failed\n");
 921                 goto err;
 922         }
 923
 924         Data &= ~0x80;
 925         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 926         if (status < 0) {
 927                 dev_dbg(&port->dev, "writing Spreg failed\n");
 928                 goto err;
 929         }
 930         /* End of block to be checked */
 931
 932         Data = 0x0;
 933         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 934                                                                         &Data);
 935         if (status < 0) {
 936                 dev_dbg(&port->dev, "Reading Controlreg failed\n");
 937                 goto err;
 938         }
 939         Data |= 0x08;           /* Driver done bit */
 940         Data |= 0x20;           /* rx_disable */
 941         status = mos7840_set_reg_sync(port,
 942                                 mos7840_port->ControlRegOffset, Data);
 943         if (status < 0) {
 944                 dev_dbg(&port->dev, "writing Controlreg failed\n");
 945                 goto err;
 946         }
 947         /* do register settings here */
 948         /* Set all regs to the device default values. */
 949         /***********************************
 950          * First Disable all interrupts.
 951          ***********************************/
 952         Data = 0x00;
 953         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 954         if (status < 0) {
 955                 dev_dbg(&port->dev, "disabling interrupts failed\n");
 956                 goto err;
 957         }
 958         /* Set FIFO_CONTROL_REGISTER to the default value */
 959         Data = 0x00;
 960         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 961         if (status < 0) {
 962                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
 963                 goto err;
 964         }
 965
 966         Data = 0xcf;
 967         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 968         if (status < 0) {
 969                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
 970                 goto err;
 971         }
 972
 973         Data = 0x03;
 974         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 975         mos7840_port->shadowLCR = Data;
 976
 977         Data = 0x0b;
 978         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
 979         mos7840_port->shadowMCR = Data;
 980
 981         Data = 0x00;
 982         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 983         mos7840_port->shadowLCR = Data;
 984
 985         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
 986         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 987
 988         Data = 0x0c;
 989         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
 990
 991         Data = 0x0;
 992         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
 993
 994         Data = 0x00;
 995         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 996
 997         Data = Data & ~SERIAL_LCR_DLAB;
 998         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 999         mos7840_port->shadowLCR = Data;
1000
1001         /* clearing Bulkin and Bulkout Fifo */
1002         Data = 0x0;
1003         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1004
1005         Data = Data | 0x0c;
1006         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1007
1008         Data = Data & ~0x0c;
1009         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1010         /* Finally enable all interrupts */
1011         Data = 0x0c;
1012         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1013
1014         /* clearing rx_disable */
1015         Data = 0x0;
1016         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1017                                                                         &Data);
1018         Data = Data & ~0x20;
1019         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1020                                                                         Data);
1021
1022         /* rx_negate */
1023         Data = 0x0;
1024         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1025                                                                         &Data);
1026         Data = Data | 0x10;
1027         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1028                                                                         Data);
1029
1030         /* Check to see if we've set up our endpoint info yet    *
1031          * (can't set it up in mos7840_startup as the structures *
1032          * were not set up at that time.)                        */
1033         if (port0->open_ports == 1) {
1034                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1035                         /* set up interrupt urb */
1036                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1037                                 serial->dev,
1038                                 usb_rcvintpipe(serial->dev,
1039                                 serial->port[0]->interrupt_in_endpointAddress),
1040                                 serial->port[0]->interrupt_in_buffer,
1041                                 serial->port[0]->interrupt_in_urb->
1042                                 transfer_buffer_length,
1043                                 mos7840_interrupt_callback,
1044                                 serial,
1045                                 serial->port[0]->interrupt_in_urb->interval);
1046
1047                         /* start interrupt read for mos7840               *
1048                          * will continue as long as mos7840 is connected  */
1049
1050                         response =
1051                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1052                                            GFP_KERNEL);
1053                         if (response) {
1054                                 dev_err(&port->dev, "%s - Error %d submitting "
1055                                         "interrupt urb\n", __func__, response);
1056                         }
1057
1058                 }
1059
1060         }
1061
1062         /* see if we've set up our endpoint info yet   *
1063          * (can't set it up in mos7840_startup as the  *
1064          * structures were not set up at that time.)   */
1065
1066         dev_dbg(&port->dev, "port number is %d\n", port->port_number);
1067         dev_dbg(&port->dev, "minor number is %d\n", port->minor);
1068         dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
1069         dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
1070         dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
1071         dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
1072         mos7840_port->read_urb = port->read_urb;
1073
1074         /* set up our bulk in urb */
1075         if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1076                 usb_fill_bulk_urb(mos7840_port->read_urb,
1077                         serial->dev,
1078                         usb_rcvbulkpipe(serial->dev,
1079                                 (port->bulk_in_endpointAddress) + 2),
1080                         port->bulk_in_buffer,
1081                         mos7840_port->read_urb->transfer_buffer_length,
1082                         mos7840_bulk_in_callback, mos7840_port);
1083         } else {
1084                 usb_fill_bulk_urb(mos7840_port->read_urb,
1085                         serial->dev,
1086                         usb_rcvbulkpipe(serial->dev,
1087                                 port->bulk_in_endpointAddress),
1088                         port->bulk_in_buffer,
1089                         mos7840_port->read_urb->transfer_buffer_length,
1090                         mos7840_bulk_in_callback, mos7840_port);
1091         }
1092
1093         dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
1094         mos7840_port->read_urb_busy = true;
1095         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1096         if (response) {
1097                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1098                         __func__, response);
1099                 mos7840_port->read_urb_busy = false;
1100         }
1101
1102         /* initialize our port settings */
1103         /* Must set to enable ints! */
1104         mos7840_port->shadowMCR = MCR_MASTER_IE;
1105         /* send a open port command */
1106         mos7840_port->open = 1;
1107         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1108
1109         return 0;
1110 err:
1111         for (j = 0; j < NUM_URBS; ++j) {
1112                 urb = mos7840_port->write_urb_pool[j];
1113                 if (!urb)
1114                         continue;
1115                 kfree(urb->transfer_buffer);
1116                 usb_free_urb(urb);
1117         }
1118         return status;
1119 }
1120
1121 /*****************************************************************************
1122  * mos7840_chars_in_buffer
1123  *      this function is called by the tty driver when it wants to know how many
1124  *      bytes of data we currently have outstanding in the port (data that has
1125  *      been written, but hasn't made it out the port yet)
1126  *      If successful, we return the number of bytes left to be written in the
1127  *      system,
1128  *      Otherwise we return zero.
1129  *****************************************************************************/
1130
1131 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1132 {
1133         struct usb_serial_port *port = tty->driver_data;
1134         int i;
1135         int chars = 0;
1136         unsigned long flags;
1137         struct moschip_port *mos7840_port;
1138
1139         if (mos7840_port_paranoia_check(port, __func__))
1140                 return 0;
1141
1142         mos7840_port = mos7840_get_port_private(port);
1143         if (mos7840_port == NULL)
1144                 return 0;
1145
1146         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1147         for (i = 0; i < NUM_URBS; ++i) {
1148                 if (mos7840_port->busy[i]) {
1149                         struct urb *urb = mos7840_port->write_urb_pool[i];
1150                         chars += urb->transfer_buffer_length;
1151                 }
1152         }
1153         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1154         dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1155         return chars;
1156
1157 }
1158
1159 /*****************************************************************************
1160  * mos7840_close
1161  *      this function is called by the tty driver when a port is closed
1162  *****************************************************************************/
1163
1164 static void mos7840_close(struct usb_serial_port *port)
1165 {
1166         struct usb_serial *serial;
1167         struct moschip_port *mos7840_port;
1168         struct moschip_port *port0;
1169         int j;
1170         __u16 Data;
1171
1172         if (mos7840_port_paranoia_check(port, __func__))
1173                 return;
1174
1175         serial = mos7840_get_usb_serial(port, __func__);
1176         if (!serial)
1177                 return;
1178
1179         mos7840_port = mos7840_get_port_private(port);
1180         port0 = mos7840_get_port_private(serial->port[0]);
1181
1182         if (mos7840_port == NULL || port0 == NULL)
1183                 return;
1184
1185         for (j = 0; j < NUM_URBS; ++j)
1186                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1187
1188         /* Freeing Write URBs */
1189         for (j = 0; j < NUM_URBS; ++j) {
1190                 if (mos7840_port->write_urb_pool[j]) {
1191                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1192                                 kfree(mos7840_port->write_urb_pool[j]->
1193                                       transfer_buffer);
1194
1195                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1196                 }
1197         }
1198
1199         usb_kill_urb(mos7840_port->write_urb);
1200         usb_kill_urb(mos7840_port->read_urb);
1201         mos7840_port->read_urb_busy = false;
1202
1203         port0->open_ports--;
1204         dev_dbg(&port->dev, "%s in close%d\n", __func__, port0->open_ports);
1205         if (port0->open_ports == 0) {
1206                 if (serial->port[0]->interrupt_in_urb) {
1207                         dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n");
1208                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1209                 }
1210         }
1211
1212         if (mos7840_port->write_urb) {
1213                 /* if this urb had a transfer buffer already (old tx) free it */
1214                 kfree(mos7840_port->write_urb->transfer_buffer);
1215                 usb_free_urb(mos7840_port->write_urb);
1216         }
1217
1218         Data = 0x0;
1219         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1220
1221         Data = 0x00;
1222         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1223
1224         mos7840_port->open = 0;
1225 }
1226
1227 /*****************************************************************************
1228  * mos7840_break
1229  *      this function sends a break to the port
1230  *****************************************************************************/
1231 static void mos7840_break(struct tty_struct *tty, int break_state)
1232 {
1233         struct usb_serial_port *port = tty->driver_data;
1234         unsigned char data;
1235         struct usb_serial *serial;
1236         struct moschip_port *mos7840_port;
1237
1238         if (mos7840_port_paranoia_check(port, __func__))
1239                 return;
1240
1241         serial = mos7840_get_usb_serial(port, __func__);
1242         if (!serial)
1243                 return;
1244
1245         mos7840_port = mos7840_get_port_private(port);
1246
1247         if (mos7840_port == NULL)
1248                 return;
1249
1250         if (break_state == -1)
1251                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1252         else
1253                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1254
1255         /* FIXME: no locking on shadowLCR anywhere in driver */
1256         mos7840_port->shadowLCR = data;
1257         dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1258         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1259                              mos7840_port->shadowLCR);
1260 }
1261
1262 /*****************************************************************************
1263  * mos7840_write_room
1264  *      this function is called by the tty driver when it wants to know how many
1265  *      bytes of data we can accept for a specific port.
1266  *      If successful, we return the amount of room that we have for this port
1267  *      Otherwise we return a negative error number.
1268  *****************************************************************************/
1269
1270 static int mos7840_write_room(struct tty_struct *tty)
1271 {
1272         struct usb_serial_port *port = tty->driver_data;
1273         int i;
1274         int room = 0;
1275         unsigned long flags;
1276         struct moschip_port *mos7840_port;
1277
1278         if (mos7840_port_paranoia_check(port, __func__))
1279                 return -1;
1280
1281         mos7840_port = mos7840_get_port_private(port);
1282         if (mos7840_port == NULL)
1283                 return -1;
1284
1285         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1286         for (i = 0; i < NUM_URBS; ++i) {
1287                 if (!mos7840_port->busy[i])
1288                         room += URB_TRANSFER_BUFFER_SIZE;
1289         }
1290         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1291
1292         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1293         dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room);
1294         return room;
1295
1296 }
1297
1298 /*****************************************************************************
1299  * mos7840_write
1300  *      this function is called by the tty driver when data should be written to
1301  *      the port.
1302  *      If successful, we return the number of bytes written, otherwise we
1303  *      return a negative error number.
1304  *****************************************************************************/
1305
1306 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1307                          const unsigned char *data, int count)
1308 {
1309         int status;
1310         int i;
1311         int bytes_sent = 0;
1312         int transfer_size;
1313         unsigned long flags;
1314
1315         struct moschip_port *mos7840_port;
1316         struct usb_serial *serial;
1317         struct urb *urb;
1318         /* __u16 Data; */
1319         const unsigned char *current_position = data;
1320         unsigned char *data1;
1321
1322 #ifdef NOTMOS7840
1323         Data = 0x00;
1324         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1325         mos7840_port->shadowLCR = Data;
1326         dev_dbg(&port->dev, "%s: LINE_CONTROL_REGISTER is %x\n", __func__, Data);
1327         dev_dbg(&port->dev, "%s: mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1328
1329         /* Data = 0x03; */
1330         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1331         /* mos7840_port->shadowLCR=Data;//Need to add later */
1332
1333         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1334         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1335
1336         /* Data = 0x0c; */
1337         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1338         Data = 0x00;
1339         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1340         dev_dbg(&port->dev, "%s: DLL value is %x\n", __func__, Data);
1341
1342         Data = 0x0;
1343         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1344         dev_dbg(&port->dev, "%s: DLM value is %x\n", __func__, Data);
1345
1346         Data = Data & ~SERIAL_LCR_DLAB;
1347         dev_dbg(&port->dev, "%s: mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1348         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1349 #endif
1350
1351         if (mos7840_port_paranoia_check(port, __func__))
1352                 return -1;
1353
1354         serial = port->serial;
1355         if (mos7840_serial_paranoia_check(serial, __func__))
1356                 return -1;
1357
1358         mos7840_port = mos7840_get_port_private(port);
1359         if (mos7840_port == NULL)
1360                 return -1;
1361
1362         /* try to find a free urb in the list */
1363         urb = NULL;
1364
1365         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1366         for (i = 0; i < NUM_URBS; ++i) {
1367                 if (!mos7840_port->busy[i]) {
1368                         mos7840_port->busy[i] = 1;
1369                         urb = mos7840_port->write_urb_pool[i];
1370                         dev_dbg(&port->dev, "URB:%d\n", i);
1371                         break;
1372                 }
1373         }
1374         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1375
1376         if (urb == NULL) {
1377                 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1378                 goto exit;
1379         }
1380
1381         if (urb->transfer_buffer == NULL) {
1382                 urb->transfer_buffer =
1383                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1384
1385                 if (urb->transfer_buffer == NULL) {
1386                         dev_err_console(port, "%s no more kernel memory...\n",
1387                                 __func__);
1388                         goto exit;
1389                 }
1390         }
1391         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1392
1393         memcpy(urb->transfer_buffer, current_position, transfer_size);
1394
1395         /* fill urb with data and submit  */
1396         if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1397                 usb_fill_bulk_urb(urb,
1398                         serial->dev,
1399                         usb_sndbulkpipe(serial->dev,
1400                                 (port->bulk_out_endpointAddress) + 2),
1401                         urb->transfer_buffer,
1402                         transfer_size,
1403                         mos7840_bulk_out_data_callback, mos7840_port);
1404         } else {
1405                 usb_fill_bulk_urb(urb,
1406                         serial->dev,
1407                         usb_sndbulkpipe(serial->dev,
1408                                 port->bulk_out_endpointAddress),
1409                         urb->transfer_buffer,
1410                         transfer_size,
1411                         mos7840_bulk_out_data_callback, mos7840_port);
1412         }
1413
1414         data1 = urb->transfer_buffer;
1415         dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
1416
1417         if (mos7840_port->has_led)
1418                 mos7840_led_activity(port);
1419
1420         /* send it down the pipe */
1421         status = usb_submit_urb(urb, GFP_ATOMIC);
1422
1423         if (status) {
1424                 mos7840_port->busy[i] = 0;
1425                 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1426                         "with status = %d\n", __func__, status);
1427                 bytes_sent = status;
1428                 goto exit;
1429         }
1430         bytes_sent = transfer_size;
1431         port->icount.tx += transfer_size;
1432         dev_dbg(&port->dev, "icount.tx is %d:\n", port->icount.tx);
1433 exit:
1434         return bytes_sent;
1435
1436 }
1437
1438 /*****************************************************************************
1439  * mos7840_throttle
1440  *      this function is called by the tty driver when it wants to stop the data
1441  *      being read from the port.
1442  *****************************************************************************/
1443
1444 static void mos7840_throttle(struct tty_struct *tty)
1445 {
1446         struct usb_serial_port *port = tty->driver_data;
1447         struct moschip_port *mos7840_port;
1448         int status;
1449
1450         if (mos7840_port_paranoia_check(port, __func__))
1451                 return;
1452
1453         mos7840_port = mos7840_get_port_private(port);
1454
1455         if (mos7840_port == NULL)
1456                 return;
1457
1458         if (!mos7840_port->open) {
1459                 dev_dbg(&port->dev, "%s", "port not opened\n");
1460                 return;
1461         }
1462
1463         /* if we are implementing XON/XOFF, send the stop character */
1464         if (I_IXOFF(tty)) {
1465                 unsigned char stop_char = STOP_CHAR(tty);
1466                 status = mos7840_write(tty, port, &stop_char, 1);
1467                 if (status <= 0)
1468                         return;
1469         }
1470         /* if we are implementing RTS/CTS, toggle that line */
1471         if (tty->termios.c_cflag & CRTSCTS) {
1472                 mos7840_port->shadowMCR &= ~MCR_RTS;
1473                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1474                                          mos7840_port->shadowMCR);
1475                 if (status < 0)
1476                         return;
1477         }
1478 }
1479
1480 /*****************************************************************************
1481  * mos7840_unthrottle
1482  *      this function is called by the tty driver when it wants to resume
1483  *      the data being read from the port (called after mos7840_throttle is
1484  *      called)
1485  *****************************************************************************/
1486 static void mos7840_unthrottle(struct tty_struct *tty)
1487 {
1488         struct usb_serial_port *port = tty->driver_data;
1489         int status;
1490         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1491
1492         if (mos7840_port_paranoia_check(port, __func__))
1493                 return;
1494
1495         if (mos7840_port == NULL)
1496                 return;
1497
1498         if (!mos7840_port->open) {
1499                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1500                 return;
1501         }
1502
1503         /* if we are implementing XON/XOFF, send the start character */
1504         if (I_IXOFF(tty)) {
1505                 unsigned char start_char = START_CHAR(tty);
1506                 status = mos7840_write(tty, port, &start_char, 1);
1507                 if (status <= 0)
1508                         return;
1509         }
1510
1511         /* if we are implementing RTS/CTS, toggle that line */
1512         if (tty->termios.c_cflag & CRTSCTS) {
1513                 mos7840_port->shadowMCR |= MCR_RTS;
1514                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1515                                          mos7840_port->shadowMCR);
1516                 if (status < 0)
1517                         return;
1518         }
1519 }
1520
1521 static int mos7840_tiocmget(struct tty_struct *tty)
1522 {
1523         struct usb_serial_port *port = tty->driver_data;
1524         struct moschip_port *mos7840_port;
1525         unsigned int result;
1526         __u16 msr;
1527         __u16 mcr;
1528         int status;
1529         mos7840_port = mos7840_get_port_private(port);
1530
1531         if (mos7840_port == NULL)
1532                 return -ENODEV;
1533
1534         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1535         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1536         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1537             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1538             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1539             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1540             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1541             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1542             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1543
1544         dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1545
1546         return result;
1547 }
1548
1549 static int mos7840_tiocmset(struct tty_struct *tty,
1550                             unsigned int set, unsigned int clear)
1551 {
1552         struct usb_serial_port *port = tty->driver_data;
1553         struct moschip_port *mos7840_port;
1554         unsigned int mcr;
1555         int status;
1556
1557         mos7840_port = mos7840_get_port_private(port);
1558
1559         if (mos7840_port == NULL)
1560                 return -ENODEV;
1561
1562         /* FIXME: What locks the port registers ? */
1563         mcr = mos7840_port->shadowMCR;
1564         if (clear & TIOCM_RTS)
1565                 mcr &= ~MCR_RTS;
1566         if (clear & TIOCM_DTR)
1567                 mcr &= ~MCR_DTR;
1568         if (clear & TIOCM_LOOP)
1569                 mcr &= ~MCR_LOOPBACK;
1570
1571         if (set & TIOCM_RTS)
1572                 mcr |= MCR_RTS;
1573         if (set & TIOCM_DTR)
1574                 mcr |= MCR_DTR;
1575         if (set & TIOCM_LOOP)
1576                 mcr |= MCR_LOOPBACK;
1577
1578         mos7840_port->shadowMCR = mcr;
1579
1580         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1581         if (status < 0) {
1582                 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1583                 return status;
1584         }
1585
1586         return 0;
1587 }
1588
1589 /*****************************************************************************
1590  * mos7840_calc_baud_rate_divisor
1591  *      this function calculates the proper baud rate divisor for the specified
1592  *      baud rate.
1593  *****************************************************************************/
1594 static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1595                                           int baudRate, int *divisor,
1596                                           __u16 *clk_sel_val)
1597 {
1598         dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1599
1600         if (baudRate <= 115200) {
1601                 *divisor = 115200 / baudRate;
1602                 *clk_sel_val = 0x0;
1603         }
1604         if ((baudRate > 115200) && (baudRate <= 230400)) {
1605                 *divisor = 230400 / baudRate;
1606                 *clk_sel_val = 0x10;
1607         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1608                 *divisor = 403200 / baudRate;
1609                 *clk_sel_val = 0x20;
1610         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1611                 *divisor = 460800 / baudRate;
1612                 *clk_sel_val = 0x30;
1613         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1614                 *divisor = 806400 / baudRate;
1615                 *clk_sel_val = 0x40;
1616         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1617                 *divisor = 921600 / baudRate;
1618                 *clk_sel_val = 0x50;
1619         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1620                 *divisor = 1572864 / baudRate;
1621                 *clk_sel_val = 0x60;
1622         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1623                 *divisor = 3145728 / baudRate;
1624                 *clk_sel_val = 0x70;
1625         }
1626         return 0;
1627
1628 #ifdef NOTMCS7840
1629
1630         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1631                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1632                         *divisor = mos7840_divisor_table[i].Divisor;
1633                         return 0;
1634                 }
1635         }
1636
1637         /* After trying for all the standard baud rates    *
1638          * Try calculating the divisor for this baud rate  */
1639
1640         if (baudrate > 75 && baudrate < 230400) {
1641                 /* get the divisor */
1642                 custom = (__u16) (230400L / baudrate);
1643
1644                 /* Check for round off */
1645                 round1 = (__u16) (2304000L / baudrate);
1646                 round = (__u16) (round1 - (custom * 10));
1647                 if (round > 4)
1648                         custom++;
1649                 *divisor = custom;
1650
1651                 dev_dbg(&port->dev, " Baud %d = %d\n", baudrate, custom);
1652                 return 0;
1653         }
1654
1655         dev_dbg(&port->dev, "%s", " Baud calculation Failed...\n");
1656         return -1;
1657 #endif
1658 }
1659
1660 /*****************************************************************************
1661  * mos7840_send_cmd_write_baud_rate
1662  *      this function sends the proper command to change the baud rate of the
1663  *      specified port.
1664  *****************************************************************************/
1665
1666 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1667                                             int baudRate)
1668 {
1669         int divisor = 0;
1670         int status;
1671         __u16 Data;
1672         unsigned char number;
1673         __u16 clk_sel_val;
1674         struct usb_serial_port *port;
1675
1676         if (mos7840_port == NULL)
1677                 return -1;
1678
1679         port = mos7840_port->port;
1680         if (mos7840_port_paranoia_check(port, __func__))
1681                 return -1;
1682
1683         if (mos7840_serial_paranoia_check(port->serial, __func__))
1684                 return -1;
1685
1686         number = mos7840_port->port->port_number;
1687
1688         dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudRate);
1689         /* reset clk_uart_sel in spregOffset */
1690         if (baudRate > 115200) {
1691 #ifdef HW_flow_control
1692                 /* NOTE: need to see the pther register to modify */
1693                 /* setting h/w flow control bit to 1 */
1694                 Data = 0x2b;
1695                 mos7840_port->shadowMCR = Data;
1696                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1697                                                                         Data);
1698                 if (status < 0) {
1699                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1700                         return -1;
1701                 }
1702 #endif
1703
1704         } else {
1705 #ifdef HW_flow_control
1706                 /* setting h/w flow control bit to 0 */
1707                 Data = 0xb;
1708                 mos7840_port->shadowMCR = Data;
1709                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1710                                                                         Data);
1711                 if (status < 0) {
1712                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1713                         return -1;
1714                 }
1715 #endif
1716
1717         }
1718
1719         if (1) {                /* baudRate <= 115200) */
1720                 clk_sel_val = 0x0;
1721                 Data = 0x0;
1722                 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1723                                                    &clk_sel_val);
1724                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1725                                                                  &Data);
1726                 if (status < 0) {
1727                         dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1728                         return -1;
1729                 }
1730                 Data = (Data & 0x8f) | clk_sel_val;
1731                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1732                                                                 Data);
1733                 if (status < 0) {
1734                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1735                         return -1;
1736                 }
1737                 /* Calculate the Divisor */
1738
1739                 if (status) {
1740                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1741                         return status;
1742                 }
1743                 /* Enable access to divisor latch */
1744                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1745                 mos7840_port->shadowLCR = Data;
1746                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1747
1748                 /* Write the divisor */
1749                 Data = (unsigned char)(divisor & 0xff);
1750                 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1751                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1752
1753                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1754                 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1755                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1756
1757                 /* Disable access to divisor latch */
1758                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1759                 mos7840_port->shadowLCR = Data;
1760                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1761
1762         }
1763         return status;
1764 }
1765
1766 /*****************************************************************************
1767  * mos7840_change_port_settings
1768  *      This routine is called to set the UART on the device to match
1769  *      the specified new settings.
1770  *****************************************************************************/
1771
1772 static void mos7840_change_port_settings(struct tty_struct *tty,
1773         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1774 {
1775         int baud;
1776         unsigned cflag;
1777         unsigned iflag;
1778         __u8 lData;
1779         __u8 lParity;
1780         __u8 lStop;
1781         int status;
1782         __u16 Data;
1783         struct usb_serial_port *port;
1784         struct usb_serial *serial;
1785
1786         if (mos7840_port == NULL)
1787                 return;
1788
1789         port = mos7840_port->port;
1790
1791         if (mos7840_port_paranoia_check(port, __func__))
1792                 return;
1793
1794         if (mos7840_serial_paranoia_check(port->serial, __func__))
1795                 return;
1796
1797         serial = port->serial;
1798
1799         if (!mos7840_port->open) {
1800                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1801                 return;
1802         }
1803
1804         lData = LCR_BITS_8;
1805         lStop = LCR_STOP_1;
1806         lParity = LCR_PAR_NONE;
1807
1808         cflag = tty->termios.c_cflag;
1809         iflag = tty->termios.c_iflag;
1810
1811         /* Change the number of bits */
1812         if (cflag & CSIZE) {
1813                 switch (cflag & CSIZE) {
1814                 case CS5:
1815                         lData = LCR_BITS_5;
1816                         break;
1817
1818                 case CS6:
1819                         lData = LCR_BITS_6;
1820                         break;
1821
1822                 case CS7:
1823                         lData = LCR_BITS_7;
1824                         break;
1825                 default:
1826                 case CS8:
1827                         lData = LCR_BITS_8;
1828                         break;
1829                 }
1830         }
1831         /* Change the Parity bit */
1832         if (cflag & PARENB) {
1833                 if (cflag & PARODD) {
1834                         lParity = LCR_PAR_ODD;
1835                         dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1836                 } else {
1837                         lParity = LCR_PAR_EVEN;
1838                         dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1839                 }
1840
1841         } else {
1842                 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1843         }
1844
1845         if (cflag & CMSPAR)
1846                 lParity = lParity | 0x20;
1847
1848         /* Change the Stop bit */
1849         if (cflag & CSTOPB) {
1850                 lStop = LCR_STOP_2;
1851                 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1852         } else {
1853                 lStop = LCR_STOP_1;
1854                 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1855         }
1856
1857         /* Update the LCR with the correct value */
1858         mos7840_port->shadowLCR &=
1859             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1860         mos7840_port->shadowLCR |= (lData | lParity | lStop);
1861
1862         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1863                 mos7840_port->shadowLCR);
1864         /* Disable Interrupts */
1865         Data = 0x00;
1866         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1867
1868         Data = 0x00;
1869         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1870
1871         Data = 0xcf;
1872         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1873
1874         /* Send the updated LCR value to the mos7840 */
1875         Data = mos7840_port->shadowLCR;
1876
1877         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1878
1879         Data = 0x00b;
1880         mos7840_port->shadowMCR = Data;
1881         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1882         Data = 0x00b;
1883         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1884
1885         /* set up the MCR register and send it to the mos7840 */
1886
1887         mos7840_port->shadowMCR = MCR_MASTER_IE;
1888         if (cflag & CBAUD)
1889                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1890
1891         if (cflag & CRTSCTS)
1892                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1893         else
1894                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1895
1896         Data = mos7840_port->shadowMCR;
1897         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1898
1899         /* Determine divisor based on baud rate */
1900         baud = tty_get_baud_rate(tty);
1901
1902         if (!baud) {
1903                 /* pick a default, any default... */
1904                 dev_dbg(&port->dev, "%s", "Picked default baud...\n");
1905                 baud = 9600;
1906         }
1907
1908         dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1909         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
1910
1911         /* Enable Interrupts */
1912         Data = 0x0c;
1913         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1914
1915         if (mos7840_port->read_urb_busy == false) {
1916                 mos7840_port->read_urb_busy = true;
1917                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
1918                 if (status) {
1919                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1920                             status);
1921                         mos7840_port->read_urb_busy = false;
1922                 }
1923         }
1924         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
1925                 mos7840_port->shadowLCR);
1926 }
1927
1928 /*****************************************************************************
1929  * mos7840_set_termios
1930  *      this function is called by the tty driver when it wants to change
1931  *      the termios structure
1932  *****************************************************************************/
1933
1934 static void mos7840_set_termios(struct tty_struct *tty,
1935                                 struct usb_serial_port *port,
1936                                 struct ktermios *old_termios)
1937 {
1938         int status;
1939         unsigned int cflag;
1940         struct usb_serial *serial;
1941         struct moschip_port *mos7840_port;
1942
1943         if (mos7840_port_paranoia_check(port, __func__))
1944                 return;
1945
1946         serial = port->serial;
1947
1948         if (mos7840_serial_paranoia_check(serial, __func__))
1949                 return;
1950
1951         mos7840_port = mos7840_get_port_private(port);
1952
1953         if (mos7840_port == NULL)
1954                 return;
1955
1956         if (!mos7840_port->open) {
1957                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1958                 return;
1959         }
1960
1961         dev_dbg(&port->dev, "%s", "setting termios - \n");
1962
1963         cflag = tty->termios.c_cflag;
1964
1965         dev_dbg(&port->dev, "%s - clfag %08x iflag %08x\n", __func__,
1966                 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
1967         dev_dbg(&port->dev, "%s - old clfag %08x old iflag %08x\n", __func__,
1968                 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
1969
1970         /* change the port settings to the new ones specified */
1971
1972         mos7840_change_port_settings(tty, mos7840_port, old_termios);
1973
1974         if (!mos7840_port->read_urb) {
1975                 dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n");
1976                 return;
1977         }
1978
1979         if (mos7840_port->read_urb_busy == false) {
1980                 mos7840_port->read_urb_busy = true;
1981                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
1982                 if (status) {
1983                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1984                             status);
1985                         mos7840_port->read_urb_busy = false;
1986                 }
1987         }
1988 }
1989
1990 /*****************************************************************************
1991  * mos7840_get_lsr_info - get line status register info
1992  *
1993  * Purpose: Let user call ioctl() to get info when the UART physically
1994  *          is emptied.  On bus types like RS485, the transmitter must
1995  *          release the bus after transmitting. This must be done when
1996  *          the transmit shift register is empty, not be done when the
1997  *          transmit holding register is empty.  This functionality
1998  *          allows an RS485 driver to be written in user space.
1999  *****************************************************************************/
2000
2001 static int mos7840_get_lsr_info(struct tty_struct *tty,
2002                                 unsigned int __user *value)
2003 {
2004         int count;
2005         unsigned int result = 0;
2006
2007         count = mos7840_chars_in_buffer(tty);
2008         if (count == 0)
2009                 result = TIOCSER_TEMT;
2010
2011         if (copy_to_user(value, &result, sizeof(int)))
2012                 return -EFAULT;
2013         return 0;
2014 }
2015
2016 /*****************************************************************************
2017  * mos7840_get_serial_info
2018  *      function to get information about serial port
2019  *****************************************************************************/
2020
2021 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2022                                    struct serial_struct __user *retinfo)
2023 {
2024         struct serial_struct tmp;
2025
2026         if (mos7840_port == NULL)
2027                 return -1;
2028
2029         if (!retinfo)
2030                 return -EFAULT;
2031
2032         memset(&tmp, 0, sizeof(tmp));
2033
2034         tmp.type = PORT_16550A;
2035         tmp.line = mos7840_port->port->minor;
2036         tmp.port = mos7840_port->port->port_number;
2037         tmp.irq = 0;
2038         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2039         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2040         tmp.baud_base = 9600;
2041         tmp.close_delay = 5 * HZ;
2042         tmp.closing_wait = 30 * HZ;
2043
2044         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2045                 return -EFAULT;
2046         return 0;
2047 }
2048
2049 /*****************************************************************************
2050  * SerialIoctl
2051  *      this function handles any ioctl calls to the driver
2052  *****************************************************************************/
2053
2054 static int mos7840_ioctl(struct tty_struct *tty,
2055                          unsigned int cmd, unsigned long arg)
2056 {
2057         struct usb_serial_port *port = tty->driver_data;
2058         void __user *argp = (void __user *)arg;
2059         struct moschip_port *mos7840_port;
2060
2061         if (mos7840_port_paranoia_check(port, __func__))
2062                 return -1;
2063
2064         mos7840_port = mos7840_get_port_private(port);
2065
2066         if (mos7840_port == NULL)
2067                 return -1;
2068
2069         dev_dbg(&port->dev, "%s - cmd = 0x%x\n", __func__, cmd);
2070
2071         switch (cmd) {
2072                 /* return number of bytes available */
2073
2074         case TIOCSERGETLSR:
2075                 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
2076                 return mos7840_get_lsr_info(tty, argp);
2077
2078         case TIOCGSERIAL:
2079                 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
2080                 return mos7840_get_serial_info(mos7840_port, argp);
2081
2082         case TIOCSSERIAL:
2083                 dev_dbg(&port->dev, "%s TIOCSSERIAL\n", __func__);
2084                 break;
2085         default:
2086                 break;
2087         }
2088         return -ENOIOCTLCMD;
2089 }
2090
2091 static int mos7810_check(struct usb_serial *serial)
2092 {
2093         int i, pass_count = 0;
2094         u8 *buf;
2095         __u16 data = 0, mcr_data = 0;
2096         __u16 test_pattern = 0x55AA;
2097         int res;
2098
2099         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2100         if (!buf)
2101                 return 0;       /* failed to identify 7810 */
2102
2103         /* Store MCR setting */
2104         res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2105                 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
2106                 buf, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2107         if (res == VENDOR_READ_LENGTH)
2108                 mcr_data = *buf;
2109
2110         for (i = 0; i < 16; i++) {
2111                 /* Send the 1-bit test pattern out to MCS7810 test pin */
2112                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2113                         MCS_WRREQ, MCS_WR_RTYPE,
2114                         (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
2115                         MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
2116
2117                 /* Read the test pattern back */
2118                 res = usb_control_msg(serial->dev,
2119                                 usb_rcvctrlpipe(serial->dev, 0), MCS_RDREQ,
2120                                 MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2121                                 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2122                 if (res == VENDOR_READ_LENGTH)
2123                         data = *buf;
2124
2125                 /* If this is a MCS7810 device, both test patterns must match */
2126                 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
2127                         break;
2128
2129                 pass_count++;
2130         }
2131
2132         /* Restore MCR setting */
2133         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
2134                 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
2135                 0, MOS_WDR_TIMEOUT);
2136
2137         kfree(buf);
2138
2139         if (pass_count == 16)
2140                 return 1;
2141
2142         return 0;
2143 }
2144
2145 static int mos7840_probe(struct usb_serial *serial,
2146                                 const struct usb_device_id *id)
2147 {
2148         u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
2149         u8 *buf;
2150         int device_type;
2151
2152         if (product == MOSCHIP_DEVICE_ID_7810 ||
2153                 product == MOSCHIP_DEVICE_ID_7820) {
2154                 device_type = product;
2155                 goto out;
2156         }
2157
2158         buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2159         if (!buf)
2160                 return -ENOMEM;
2161
2162         usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2163                         MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2164                         VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2165
2166         /* For a MCS7840 device GPIO0 must be set to 1 */
2167         if (buf[0] & 0x01)
2168                 device_type = MOSCHIP_DEVICE_ID_7840;
2169         else if (mos7810_check(serial))
2170                 device_type = MOSCHIP_DEVICE_ID_7810;
2171         else
2172                 device_type = MOSCHIP_DEVICE_ID_7820;
2173
2174         kfree(buf);
2175 out:
2176         usb_set_serial_data(serial, (void *)(unsigned long)device_type);
2177
2178         return 0;
2179 }
2180
2181 static int mos7840_calc_num_ports(struct usb_serial *serial)
2182 {
2183         int device_type = (unsigned long)usb_get_serial_data(serial);
2184         int mos7840_num_ports;
2185
2186         mos7840_num_ports = (device_type >> 4) & 0x000F;
2187
2188         return mos7840_num_ports;
2189 }
2190
2191 static int mos7840_port_probe(struct usb_serial_port *port)
2192 {
2193         struct usb_serial *serial = port->serial;
2194         int device_type = (unsigned long)usb_get_serial_data(serial);
2195         struct moschip_port *mos7840_port;
2196         int status;
2197         int pnum;
2198         __u16 Data;
2199
2200         /* we set up the pointers to the endpoints in the mos7840_open *
2201          * function, as the structures aren't created yet.             */
2202
2203         pnum = port->port_number;
2204
2205         dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
2206         mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2207         if (mos7840_port == NULL) {
2208                 dev_err(&port->dev, "%s - Out of memory\n", __func__);
2209                 return -ENOMEM;
2210         }
2211
2212         /* Initialize all port interrupt end point to port 0 int
2213          * endpoint. Our device has only one interrupt end point
2214          * common to all port */
2215
2216         mos7840_port->port = port;
2217         mos7840_set_port_private(port, mos7840_port);
2218         spin_lock_init(&mos7840_port->pool_lock);
2219
2220         /* minor is not initialised until later by
2221          * usb-serial.c:get_free_serial() and cannot therefore be used
2222          * to index device instances */
2223         mos7840_port->port_num = pnum + 1;
2224         dev_dbg(&port->dev, "port->minor = %d\n", port->minor);
2225         dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
2226
2227         if (mos7840_port->port_num == 1) {
2228                 mos7840_port->SpRegOffset = 0x0;
2229                 mos7840_port->ControlRegOffset = 0x1;
2230                 mos7840_port->DcrRegOffset = 0x4;
2231         } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 4)) {
2232                 mos7840_port->SpRegOffset = 0x8;
2233                 mos7840_port->ControlRegOffset = 0x9;
2234                 mos7840_port->DcrRegOffset = 0x16;
2235         } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 2)) {
2236                 mos7840_port->SpRegOffset = 0xa;
2237                 mos7840_port->ControlRegOffset = 0xb;
2238                 mos7840_port->DcrRegOffset = 0x19;
2239         } else if ((mos7840_port->port_num == 3) && (serial->num_ports == 4)) {
2240                 mos7840_port->SpRegOffset = 0xa;
2241                 mos7840_port->ControlRegOffset = 0xb;
2242                 mos7840_port->DcrRegOffset = 0x19;
2243         } else if ((mos7840_port->port_num == 4) && (serial->num_ports == 4)) {
2244                 mos7840_port->SpRegOffset = 0xc;
2245                 mos7840_port->ControlRegOffset = 0xd;
2246                 mos7840_port->DcrRegOffset = 0x1c;
2247         }
2248         mos7840_dump_serial_port(port, mos7840_port);
2249         mos7840_set_port_private(port, mos7840_port);
2250
2251         /* enable rx_disable bit in control register */
2252         status = mos7840_get_reg_sync(port,
2253                         mos7840_port->ControlRegOffset, &Data);
2254         if (status < 0) {
2255                 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
2256                 goto out;
2257         } else
2258                 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
2259         Data |= 0x08;   /* setting driver done bit */
2260         Data |= 0x04;   /* sp1_bit to have cts change reflect in
2261                            modem status reg */
2262
2263         /* Data |= 0x20; //rx_disable bit */
2264         status = mos7840_set_reg_sync(port,
2265                         mos7840_port->ControlRegOffset, Data);
2266         if (status < 0) {
2267                 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2268                 goto out;
2269         } else
2270                 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
2271
2272         /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2273            and 0x24 in DCR3 */
2274         Data = 0x01;
2275         status = mos7840_set_reg_sync(port,
2276                         (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2277         if (status < 0) {
2278                 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
2279                 goto out;
2280         } else
2281                 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
2282
2283         Data = 0x05;
2284         status = mos7840_set_reg_sync(port,
2285                         (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2286         if (status < 0) {
2287                 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
2288                 goto out;
2289         } else
2290                 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
2291
2292         Data = 0x24;
2293         status = mos7840_set_reg_sync(port,
2294                         (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2295         if (status < 0) {
2296                 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
2297                 goto out;
2298         } else
2299                 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
2300
2301         /* write values in clkstart0x0 and clkmulti 0x20 */
2302         Data = 0x0;
2303         status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
2304         if (status < 0) {
2305                 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2306                 goto out;
2307         } else
2308                 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2309
2310         Data = 0x20;
2311         status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
2312         if (status < 0) {
2313                 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
2314                 goto error;
2315         } else
2316                 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
2317
2318         /* write value 0x0 to scratchpad register */
2319         Data = 0x00;
2320         status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
2321         if (status < 0) {
2322                 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
2323                 goto out;
2324         } else
2325                 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
2326
2327         /* Zero Length flag register */
2328         if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
2329                 Data = 0xff;
2330                 status = mos7840_set_reg_sync(port,
2331                                 (__u16) (ZLP_REG1 +
2332                                         ((__u16)mos7840_port->port_num)), Data);
2333                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2334                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
2335                 if (status < 0) {
2336                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
2337                         goto out;
2338                 } else
2339                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
2340         } else {
2341                 Data = 0xff;
2342                 status = mos7840_set_reg_sync(port,
2343                                 (__u16) (ZLP_REG1 +
2344                                         ((__u16)mos7840_port->port_num) - 0x1), Data);
2345                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2346                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
2347                 if (status < 0) {
2348                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
2349                         goto out;
2350                 } else
2351                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
2352
2353         }
2354         mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2355         mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2356         mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2357                         GFP_KERNEL);
2358         if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2359                         !mos7840_port->dr) {
2360                 status = -ENOMEM;
2361                 goto error;
2362         }
2363
2364         mos7840_port->has_led = false;
2365
2366         /* Initialize LED timers */
2367         if (device_type == MOSCHIP_DEVICE_ID_7810) {
2368                 mos7840_port->has_led = true;
2369
2370                 mos7840_port->led_urb = usb_alloc_urb(0, GFP_KERNEL);
2371                 mos7840_port->led_dr = kmalloc(sizeof(*mos7840_port->led_dr),
2372                                                                 GFP_KERNEL);
2373                 if (!mos7840_port->led_urb || !mos7840_port->led_dr) {
2374                         status = -ENOMEM;
2375                         goto error;
2376                 }
2377
2378                 init_timer(&mos7840_port->led_timer1);
2379                 mos7840_port->led_timer1.function = mos7840_led_off;
2380                 mos7840_port->led_timer1.expires =
2381                         jiffies + msecs_to_jiffies(LED_ON_MS);
2382                 mos7840_port->led_timer1.data = (unsigned long)mos7840_port;
2383
2384                 init_timer(&mos7840_port->led_timer2);
2385                 mos7840_port->led_timer2.function = mos7840_led_flag_off;
2386                 mos7840_port->led_timer2.expires =
2387                         jiffies + msecs_to_jiffies(LED_OFF_MS);
2388                 mos7840_port->led_timer2.data = (unsigned long)mos7840_port;
2389
2390                 /* Turn off LED */
2391                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2392         }
2393 out:
2394         if (pnum == serial->num_ports - 1) {
2395                 /* Zero Length flag enable */
2396                 Data = 0x0f;
2397                 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2398                 if (status < 0) {
2399                         dev_dbg(&port->dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
2400                         goto error;
2401                 } else
2402                         dev_dbg(&port->dev, "ZLP_REG5 Writing success status%d\n", status);
2403
2404                 /* setting configuration feature to one */
2405                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2406                                 0x03, 0x00, 0x01, 0x00, NULL, 0x00,
2407                                 MOS_WDR_TIMEOUT);
2408         }
2409         return 0;
2410 error:
2411         kfree(mos7840_port->led_dr);
2412         usb_free_urb(mos7840_port->led_urb);
2413         kfree(mos7840_port->dr);
2414         kfree(mos7840_port->ctrl_buf);
2415         usb_free_urb(mos7840_port->control_urb);
2416         kfree(mos7840_port);
2417
2418         return status;
2419 }
2420
2421 static int mos7840_port_remove(struct usb_serial_port *port)
2422 {
2423         struct moschip_port *mos7840_port;
2424
2425         mos7840_port = mos7840_get_port_private(port);
2426
2427         if (mos7840_port->has_led) {
2428                 /* Turn off LED */
2429                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2430
2431                 del_timer_sync(&mos7840_port->led_timer1);
2432                 del_timer_sync(&mos7840_port->led_timer2);
2433
2434                 usb_kill_urb(mos7840_port->led_urb);
2435                 usb_free_urb(mos7840_port->led_urb);
2436                 kfree(mos7840_port->led_dr);
2437         }
2438         usb_kill_urb(mos7840_port->control_urb);
2439         usb_free_urb(mos7840_port->control_urb);
2440         kfree(mos7840_port->ctrl_buf);
2441         kfree(mos7840_port->dr);
2442         kfree(mos7840_port);
2443
2444         return 0;
2445 }
2446
2447 static struct usb_serial_driver moschip7840_4port_device = {
2448         .driver = {
2449                    .owner = THIS_MODULE,
2450                    .name = "mos7840",
2451                    },
2452         .description = DRIVER_DESC,
2453         .id_table = id_table,
2454         .num_ports = 4,
2455         .open = mos7840_open,
2456         .close = mos7840_close,
2457         .write = mos7840_write,
2458         .write_room = mos7840_write_room,
2459         .chars_in_buffer = mos7840_chars_in_buffer,
2460         .throttle = mos7840_throttle,
2461         .unthrottle = mos7840_unthrottle,
2462         .calc_num_ports = mos7840_calc_num_ports,
2463         .probe = mos7840_probe,
2464         .ioctl = mos7840_ioctl,
2465         .set_termios = mos7840_set_termios,
2466         .break_ctl = mos7840_break,
2467         .tiocmget = mos7840_tiocmget,
2468         .tiocmset = mos7840_tiocmset,
2469         .tiocmiwait = usb_serial_generic_tiocmiwait,
2470         .get_icount = usb_serial_generic_get_icount,
2471         .port_probe = mos7840_port_probe,
2472         .port_remove = mos7840_port_remove,
2473         .read_bulk_callback = mos7840_bulk_in_callback,
2474         .read_int_callback = mos7840_interrupt_callback,
2475 };
2476
2477 static struct usb_serial_driver * const serial_drivers[] = {
2478         &moschip7840_4port_device, NULL
2479 };
2480
2481 module_usb_serial_driver(serial_drivers, id_table);
2482
2483 MODULE_DESCRIPTION(DRIVER_DESC);
2484 MODULE_LICENSE("GPL");