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