drivers/usb/serial/mos7840.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Clean ups from Moschip version and a few ioctl implementations by:
   4  *      Paul B Schroeder <pschroeder "at" uplogix "dot" com>
   5  *
   6  * Originally based on drivers/usb/serial/io_edgeport.c which is:
   7  *      Copyright (C) 2000 Inside Out Networks, All rights reserved.
   8  *      Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
   9  *
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/errno.h>
  14 #include <linux/slab.h>
  15 #include <linux/tty.h>
  16 #include <linux/tty_driver.h>
  17 #include <linux/tty_flip.h>
  18 #include <linux/module.h>
  19 #include <linux/serial.h>
  20 #include <linux/usb.h>
  21 #include <linux/usb/serial.h>
  22 #include <linux/uaccess.h>
  23
  24 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
  25
  26 /*
  27  * 16C50 UART register defines
  28  */
  29
  30 #define LCR_BITS_5             0x00     /* 5 bits/char */
  31 #define LCR_BITS_6             0x01     /* 6 bits/char */
  32 #define LCR_BITS_7             0x02     /* 7 bits/char */
  33 #define LCR_BITS_8             0x03     /* 8 bits/char */
  34 #define LCR_BITS_MASK          0x03     /* Mask for bits/char field */
  35
  36 #define LCR_STOP_1             0x00     /* 1 stop bit */
  37 #define LCR_STOP_1_5           0x04     /* 1.5 stop bits (if 5   bits/char) */
  38 #define LCR_STOP_2             0x04     /* 2 stop bits   (if 6-8 bits/char) */
  39 #define LCR_STOP_MASK          0x04     /* Mask for stop bits field */
  40
  41 #define LCR_PAR_NONE           0x00     /* No parity */
  42 #define LCR_PAR_ODD            0x08     /* Odd parity */
  43 #define LCR_PAR_EVEN           0x18     /* Even parity */
  44 #define LCR_PAR_MARK           0x28     /* Force parity bit to 1 */
  45 #define LCR_PAR_SPACE          0x38     /* Force parity bit to 0 */
  46 #define LCR_PAR_MASK           0x38     /* Mask for parity field */
  47
  48 #define LCR_SET_BREAK          0x40     /* Set Break condition */
  49 #define LCR_DL_ENABLE          0x80     /* Enable access to divisor latch */
  50
  51 #define MCR_DTR                0x01     /* Assert DTR */
  52 #define MCR_RTS                0x02     /* Assert RTS */
  53 #define MCR_OUT1               0x04     /* Loopback only: Sets state of RI */
  54 #define MCR_MASTER_IE          0x08     /* Enable interrupt outputs */
  55 #define MCR_LOOPBACK           0x10     /* Set internal (digital) loopback mode */
  56 #define MCR_XON_ANY            0x20     /* Enable any char to exit XOFF mode */
  57
  58 #define MOS7840_MSR_CTS        0x10     /* Current state of CTS */
  59 #define MOS7840_MSR_DSR        0x20     /* Current state of DSR */
  60 #define MOS7840_MSR_RI         0x40     /* Current state of RI */
  61 #define MOS7840_MSR_CD         0x80     /* Current state of CD */
  62
  63 /*
  64  * Defines used for sending commands to port
  65  */
  66
  67 #define MOS_WDR_TIMEOUT         5000    /* default urb timeout */
  68
  69 #define MOS_PORT1       0x0200
  70 #define MOS_PORT2       0x0300
  71 #define MOS_VENREG      0x0000
  72 #define MOS_MAX_PORT    0x02
  73 #define MOS_WRITE       0x0E
  74 #define MOS_READ        0x0D
  75
  76 /* Requests */
  77 #define MCS_RD_RTYPE    0xC0
  78 #define MCS_WR_RTYPE    0x40
  79 #define MCS_RDREQ       0x0D
  80 #define MCS_WRREQ       0x0E
  81 #define MCS_CTRL_TIMEOUT        500
  82 #define VENDOR_READ_LENGTH      (0x01)
  83
  84 #define MAX_NAME_LEN    64
  85
  86 #define ZLP_REG1  0x3A          /* Zero_Flag_Reg1    58 */
  87 #define ZLP_REG5  0x3E          /* Zero_Flag_Reg5    62 */
  88
  89 /* For higher baud Rates use TIOCEXBAUD */
  90 #define TIOCEXBAUD     0x5462
  91
  92 /* vendor id and device id defines */
  93
  94 /* The native mos7840/7820 component */
  95 #define USB_VENDOR_ID_MOSCHIP           0x9710
  96 #define MOSCHIP_DEVICE_ID_7840          0x7840
  97 #define MOSCHIP_DEVICE_ID_7843          0x7843
  98 #define MOSCHIP_DEVICE_ID_7820          0x7820
  99 #define MOSCHIP_DEVICE_ID_7810          0x7810
 100 /* The native component can have its vendor/device id's overridden
 101  * in vendor-specific implementations.  Such devices can be handled
 102  * by making a change here, in id_table.
 103  */
 104 #define USB_VENDOR_ID_BANDB              0x0856
 105 #define BANDB_DEVICE_ID_USO9ML2_2        0xAC22
 106 #define BANDB_DEVICE_ID_USO9ML2_2P       0xBC00
 107 #define BANDB_DEVICE_ID_USO9ML2_4        0xAC24
 108 #define BANDB_DEVICE_ID_USO9ML2_4P       0xBC01
 109 #define BANDB_DEVICE_ID_US9ML2_2         0xAC29
 110 #define BANDB_DEVICE_ID_US9ML2_4         0xAC30
 111 #define BANDB_DEVICE_ID_USPTL4_2         0xAC31
 112 #define BANDB_DEVICE_ID_USPTL4_4         0xAC32
 113 #define BANDB_DEVICE_ID_USOPTL4_2        0xAC42
 114 #define BANDB_DEVICE_ID_USOPTL4_2P       0xBC02
 115 #define BANDB_DEVICE_ID_USOPTL4_4        0xAC44
 116 #define BANDB_DEVICE_ID_USOPTL4_4P       0xBC03
 117 #define BANDB_DEVICE_ID_USOPTL2_4        0xAC24
 118
 119 /* This driver also supports
 120  * ATEN UC2324 device using Moschip MCS7840
 121  * ATEN UC2322 device using Moschip MCS7820
 122  */
 123 #define USB_VENDOR_ID_ATENINTL          0x0557
 124 #define ATENINTL_DEVICE_ID_UC2324       0x2011
 125 #define ATENINTL_DEVICE_ID_UC2322       0x7820
 126
 127 /* Interrupt Routine Defines    */
 128
 129 #define SERIAL_IIR_RLS      0x06
 130 #define SERIAL_IIR_MS       0x00
 131
 132 /*
 133  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 134  */
 135 #define SERIAL_LSR_DR       0x0001
 136 #define SERIAL_LSR_OE       0x0002
 137 #define SERIAL_LSR_PE       0x0004
 138 #define SERIAL_LSR_FE       0x0008
 139 #define SERIAL_LSR_BI       0x0010
 140
 141 #define MOS_MSR_DELTA_CTS   0x10
 142 #define MOS_MSR_DELTA_DSR   0x20
 143 #define MOS_MSR_DELTA_RI    0x40
 144 #define MOS_MSR_DELTA_CD    0x80
 145
 146 /* Serial Port register Address */
 147 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 148 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 149 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 150 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 151 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 152 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 153 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 154 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 155 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 156
 157 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 158 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 159 #define GPIO_REGISTER              ((__u16)(0x07))
 160
 161 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 162
 163 /*
 164  * URB POOL related defines
 165  */
 166 #define NUM_URBS                        16      /* URB Count */
 167 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 168
 169 /* LED on/off milliseconds*/
 170 #define LED_ON_MS       500
 171 #define LED_OFF_MS      500
 172
 173 enum mos7840_flag {
 174         MOS7840_FLAG_CTRL_BUSY,
 175         MOS7840_FLAG_LED_BUSY,
 176 };
 177
 178 static const struct usb_device_id id_table[] = {
 179         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 180         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7843)},
 181         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 182         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
 183         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
 184         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
 185         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 186         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
 187         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 188         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 189         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 190         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 191         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 192         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
 193         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 194         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
 195         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
 196         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 197         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 198         {}                      /* terminating entry */
 199 };
 200 MODULE_DEVICE_TABLE(usb, id_table);
 201
 202 /* This structure holds all of the local port information */
 203
 204 struct moschip_port {
 205         int port_num;           /*Actual port number in the device(1,2,etc) */
 206         struct urb *read_urb;   /* read URB for this port */
 207         __u8 shadowLCR;         /* last LCR value received */
 208         __u8 shadowMCR;         /* last MCR value received */
 209         char open;
 210         char open_ports;
 211         struct usb_serial_port *port;   /* loop back to the owner of this object */
 212
 213         /* Offsets */
 214         __u8 SpRegOffset;
 215         __u8 ControlRegOffset;
 216         __u8 DcrRegOffset;
 217         /* for processing control URBS in interrupt context */
 218         struct urb *control_urb;
 219         struct usb_ctrlrequest *dr;
 220         char *ctrl_buf;
 221         int MsrLsr;
 222
 223         spinlock_t pool_lock;
 224         struct urb *write_urb_pool[NUM_URBS];
 225         char busy[NUM_URBS];
 226         bool read_urb_busy;
 227
 228         /* For device(s) with LED indicator */
 229         bool has_led;
 230         struct timer_list led_timer1;   /* Timer for LED on */
 231         struct timer_list led_timer2;   /* Timer for LED off */
 232         struct urb *led_urb;
 233         struct usb_ctrlrequest *led_dr;
 234
 235         unsigned long flags;
 236 };
 237
 238 /*
 239  * mos7840_set_reg_sync
 240  *      To set the Control register by calling usb_fill_control_urb function
 241  *      by passing usb_sndctrlpipe function as parameter.
 242  */
 243
 244 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 245                                 __u16 val)
 246 {
 247         struct usb_device *dev = port->serial->dev;
 248         val = val & 0x00ff;
 249         dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
 250
 251         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 252                                MCS_WR_RTYPE, val, reg, NULL, 0,
 253                                MOS_WDR_TIMEOUT);
 254 }
 255
 256 /*
 257  * mos7840_get_reg_sync
 258  *      To set the Uart register by calling usb_fill_control_urb function by
 259  *      passing usb_rcvctrlpipe function as parameter.
 260  */
 261
 262 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 263                                 __u16 *val)
 264 {
 265         struct usb_device *dev = port->serial->dev;
 266         int ret = 0;
 267         u8 *buf;
 268
 269         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 270         if (!buf)
 271                 return -ENOMEM;
 272
 273         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 274                               MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
 275                               MOS_WDR_TIMEOUT);
 276         if (ret < VENDOR_READ_LENGTH) {
 277                 if (ret >= 0)
 278                         ret = -EIO;
 279                 goto out;
 280         }
 281
 282         *val = buf[0];
 283         dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
 284 out:
 285         kfree(buf);
 286         return ret;
 287 }
 288
 289 /*
 290  * mos7840_set_uart_reg
 291  *      To set the Uart register by calling usb_fill_control_urb function by
 292  *      passing usb_sndctrlpipe function as parameter.
 293  */
 294
 295 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 296                                 __u16 val)
 297 {
 298
 299         struct usb_device *dev = port->serial->dev;
 300         val = val & 0x00ff;
 301         /* For the UART control registers, the application number need
 302            to be Or'ed */
 303         if (port->serial->num_ports == 2 && port->port_number != 0)
 304                 val |= ((__u16)port->port_number + 2) << 8;
 305         else
 306                 val |= ((__u16)port->port_number + 1) << 8;
 307         dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
 308         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 309                                MCS_WR_RTYPE, val, reg, NULL, 0,
 310                                MOS_WDR_TIMEOUT);
 311
 312 }
 313
 314 /*
 315  * mos7840_get_uart_reg
 316  *      To set the Control register by calling usb_fill_control_urb function
 317  *      by passing usb_rcvctrlpipe function as parameter.
 318  */
 319 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 320                                 __u16 *val)
 321 {
 322         struct usb_device *dev = port->serial->dev;
 323         int ret = 0;
 324         __u16 Wval;
 325         u8 *buf;
 326
 327         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 328         if (!buf)
 329                 return -ENOMEM;
 330
 331         /* Wval  is same as application number */
 332         if (port->serial->num_ports == 2 && port->port_number != 0)
 333                 Wval = ((__u16)port->port_number + 2) << 8;
 334         else
 335                 Wval = ((__u16)port->port_number + 1) << 8;
 336         dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
 337         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 338                               MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
 339                               MOS_WDR_TIMEOUT);
 340         if (ret < VENDOR_READ_LENGTH) {
 341                 if (ret >= 0)
 342                         ret = -EIO;
 343                 goto out;
 344         }
 345         *val = buf[0];
 346 out:
 347         kfree(buf);
 348         return ret;
 349 }
 350
 351 static void mos7840_dump_serial_port(struct usb_serial_port *port,
 352                                      struct moschip_port *mos7840_port)
 353 {
 354
 355         dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
 356         dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
 357         dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
 358
 359 }
 360
 361 /************************************************************************/
 362 /************************************************************************/
 363 /*             I N T E R F A C E   F U N C T I O N S                    */
 364 /*             I N T E R F A C E   F U N C T I O N S                    */
 365 /************************************************************************/
 366 /************************************************************************/
 367
 368 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 369                                             struct moschip_port *data)
 370 {
 371         usb_set_serial_port_data(port, (void *)data);
 372 }
 373
 374 static inline struct moschip_port *mos7840_get_port_private(struct
 375                                                             usb_serial_port
 376                                                             *port)
 377 {
 378         return (struct moschip_port *)usb_get_serial_port_data(port);
 379 }
 380
 381 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 382 {
 383         struct moschip_port *mos7840_port;
 384         struct async_icount *icount;
 385         mos7840_port = port;
 386         if (new_msr &
 387             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 388              MOS_MSR_DELTA_CD)) {
 389                 icount = &mos7840_port->port->icount;
 390
 391                 /* update input line counters */
 392                 if (new_msr & MOS_MSR_DELTA_CTS)
 393                         icount->cts++;
 394                 if (new_msr & MOS_MSR_DELTA_DSR)
 395                         icount->dsr++;
 396                 if (new_msr & MOS_MSR_DELTA_CD)
 397                         icount->dcd++;
 398                 if (new_msr & MOS_MSR_DELTA_RI)
 399                         icount->rng++;
 400
 401                 wake_up_interruptible(&port->port->port.delta_msr_wait);
 402         }
 403 }
 404
 405 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 406 {
 407         struct async_icount *icount;
 408
 409         if (new_lsr & SERIAL_LSR_BI) {
 410                 /*
 411                  * Parity and Framing errors only count if they
 412                  * occur exclusive of a break being
 413                  * received.
 414                  */
 415                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 416         }
 417
 418         /* update input line counters */
 419         icount = &port->port->icount;
 420         if (new_lsr & SERIAL_LSR_BI)
 421                 icount->brk++;
 422         if (new_lsr & SERIAL_LSR_OE)
 423                 icount->overrun++;
 424         if (new_lsr & SERIAL_LSR_PE)
 425                 icount->parity++;
 426         if (new_lsr & SERIAL_LSR_FE)
 427                 icount->frame++;
 428 }
 429
 430 /************************************************************************/
 431 /************************************************************************/
 432 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 433 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 434 /************************************************************************/
 435 /************************************************************************/
 436
 437 static void mos7840_control_callback(struct urb *urb)
 438 {
 439         unsigned char *data;
 440         struct moschip_port *mos7840_port;
 441         struct device *dev = &urb->dev->dev;
 442         __u8 regval = 0x0;
 443         int status = urb->status;
 444
 445         mos7840_port = urb->context;
 446
 447         switch (status) {
 448         case 0:
 449                 /* success */
 450                 break;
 451         case -ECONNRESET:
 452         case -ENOENT:
 453         case -ESHUTDOWN:
 454                 /* this urb is terminated, clean up */
 455                 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
 456                 goto out;
 457         default:
 458                 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
 459                 goto out;
 460         }
 461
 462         dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length);
 463         if (urb->actual_length < 1)
 464                 goto out;
 465
 466         dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__,
 467                 mos7840_port->MsrLsr, mos7840_port->port_num);
 468         data = urb->transfer_buffer;
 469         regval = (__u8) data[0];
 470         dev_dbg(dev, "%s data is %x\n", __func__, regval);
 471         if (mos7840_port->MsrLsr == 0)
 472                 mos7840_handle_new_msr(mos7840_port, regval);
 473         else if (mos7840_port->MsrLsr == 1)
 474                 mos7840_handle_new_lsr(mos7840_port, regval);
 475 out:
 476         clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mos7840_port->flags);
 477 }
 478
 479 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 480                            __u16 *val)
 481 {
 482         struct usb_device *dev = mcs->port->serial->dev;
 483         struct usb_ctrlrequest *dr = mcs->dr;
 484         unsigned char *buffer = mcs->ctrl_buf;
 485         int ret;
 486
 487         if (test_and_set_bit_lock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags))
 488                 return -EBUSY;
 489
 490         dr->bRequestType = MCS_RD_RTYPE;
 491         dr->bRequest = MCS_RDREQ;
 492         dr->wValue = cpu_to_le16(Wval); /* 0 */
 493         dr->wIndex = cpu_to_le16(reg);
 494         dr->wLength = cpu_to_le16(2);
 495
 496         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 497                              (unsigned char *)dr, buffer, 2,
 498                              mos7840_control_callback, mcs);
 499         mcs->control_urb->transfer_buffer_length = 2;
 500         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 501         if (ret)
 502                 clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags);
 503
 504         return ret;
 505 }
 506
 507 static void mos7840_set_led_callback(struct urb *urb)
 508 {
 509         switch (urb->status) {
 510         case 0:
 511                 /* Success */
 512                 break;
 513         case -ECONNRESET:
 514         case -ENOENT:
 515         case -ESHUTDOWN:
 516                 /* This urb is terminated, clean up */
 517                 dev_dbg(&urb->dev->dev, "%s - urb shutting down: %d\n",
 518                         __func__, urb->status);
 519                 break;
 520         default:
 521                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n",
 522                         __func__, urb->status);
 523         }
 524 }
 525
 526 static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
 527                                 __u16 reg)
 528 {
 529         struct usb_device *dev = mcs->port->serial->dev;
 530         struct usb_ctrlrequest *dr = mcs->led_dr;
 531
 532         dr->bRequestType = MCS_WR_RTYPE;
 533         dr->bRequest = MCS_WRREQ;
 534         dr->wValue = cpu_to_le16(wval);
 535         dr->wIndex = cpu_to_le16(reg);
 536         dr->wLength = cpu_to_le16(0);
 537
 538         usb_fill_control_urb(mcs->led_urb, dev, usb_sndctrlpipe(dev, 0),
 539                 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
 540
 541         usb_submit_urb(mcs->led_urb, GFP_ATOMIC);
 542 }
 543
 544 static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
 545                                 __u16 val)
 546 {
 547         struct usb_device *dev = port->serial->dev;
 548
 549         usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
 550                         val, reg, NULL, 0, MOS_WDR_TIMEOUT);
 551 }
 552
 553 static void mos7840_led_off(struct timer_list *t)
 554 {
 555         struct moschip_port *mcs = from_timer(mcs, t, led_timer1);
 556
 557         /* Turn off LED */
 558         mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
 559         mod_timer(&mcs->led_timer2,
 560                                 jiffies + msecs_to_jiffies(LED_OFF_MS));
 561 }
 562
 563 static void mos7840_led_flag_off(struct timer_list *t)
 564 {
 565         struct moschip_port *mcs = from_timer(mcs, t, led_timer2);
 566
 567         clear_bit_unlock(MOS7840_FLAG_LED_BUSY, &mcs->flags);
 568 }
 569
 570 static void mos7840_led_activity(struct usb_serial_port *port)
 571 {
 572         struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
 573
 574         if (test_and_set_bit_lock(MOS7840_FLAG_LED_BUSY, &mos7840_port->flags))
 575                 return;
 576
 577         mos7840_set_led_async(mos7840_port, 0x0301, MODEM_CONTROL_REGISTER);
 578         mod_timer(&mos7840_port->led_timer1,
 579                                 jiffies + msecs_to_jiffies(LED_ON_MS));
 580 }
 581
 582 /*****************************************************************************
 583  * mos7840_interrupt_callback
 584  *      this is the callback function for when we have received data on the
 585  *      interrupt endpoint.
 586  *****************************************************************************/
 587
 588 static void mos7840_interrupt_callback(struct urb *urb)
 589 {
 590         int result;
 591         int length;
 592         struct moschip_port *mos7840_port;
 593         struct usb_serial *serial;
 594         __u16 Data;
 595         unsigned char *data;
 596         __u8 sp[5];
 597         int i, rv = 0;
 598         __u16 wval, wreg = 0;
 599         int status = urb->status;
 600
 601         switch (status) {
 602         case 0:
 603                 /* success */
 604                 break;
 605         case -ECONNRESET:
 606         case -ENOENT:
 607         case -ESHUTDOWN:
 608                 /* this urb is terminated, clean up */
 609                 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
 610                         __func__, status);
 611                 return;
 612         default:
 613                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
 614                         __func__, status);
 615                 goto exit;
 616         }
 617
 618         length = urb->actual_length;
 619         data = urb->transfer_buffer;
 620
 621         serial = urb->context;
 622
 623         /* Moschip get 5 bytes
 624          * Byte 1 IIR Port 1 (port.number is 0)
 625          * Byte 2 IIR Port 2 (port.number is 1)
 626          * Byte 3 IIR Port 3 (port.number is 2)
 627          * Byte 4 IIR Port 4 (port.number is 3)
 628          * Byte 5 FIFO status for both */
 629
 630         if (length > 5) {
 631                 dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n");
 632                 return;
 633         }
 634
 635         sp[0] = (__u8) data[0];
 636         sp[1] = (__u8) data[1];
 637         sp[2] = (__u8) data[2];
 638         sp[3] = (__u8) data[3];
 639
 640         for (i = 0; i < serial->num_ports; i++) {
 641                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 642                 wval = ((__u16)serial->port[i]->port_number + 1) << 8;
 643                 if (mos7840_port->open) {
 644                         if (sp[i] & 0x01) {
 645                                 dev_dbg(&urb->dev->dev, "SP%d No Interrupt !!!\n", i);
 646                         } else {
 647                                 switch (sp[i] & 0x0f) {
 648                                 case SERIAL_IIR_RLS:
 649                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Receiver status error or \n", i);
 650                                         dev_dbg(&urb->dev->dev, "address bit detected in 9-bit mode\n");
 651                                         mos7840_port->MsrLsr = 1;
 652                                         wreg = LINE_STATUS_REGISTER;
 653                                         break;
 654                                 case SERIAL_IIR_MS:
 655                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Modem status change\n", i);
 656                                         mos7840_port->MsrLsr = 0;
 657                                         wreg = MODEM_STATUS_REGISTER;
 658                                         break;
 659                                 }
 660                                 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 661                         }
 662                 }
 663         }
 664         if (!(rv < 0))
 665                 /* the completion handler for the control urb will resubmit */
 666                 return;
 667 exit:
 668         result = usb_submit_urb(urb, GFP_ATOMIC);
 669         if (result) {
 670                 dev_err(&urb->dev->dev,
 671                         "%s - Error %d submitting interrupt urb\n",
 672                         __func__, result);
 673         }
 674 }
 675
 676 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 677                                        const char *function)
 678 {
 679         if (!port) {
 680                 pr_debug("%s - port == NULL\n", function);
 681                 return -1;
 682         }
 683         if (!port->serial) {
 684                 pr_debug("%s - port->serial == NULL\n", function);
 685                 return -1;
 686         }
 687
 688         return 0;
 689 }
 690
 691 /* Inline functions to check the sanity of a pointer that is passed to us */
 692 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 693                                          const char *function)
 694 {
 695         if (!serial) {
 696                 pr_debug("%s - serial == NULL\n", function);
 697                 return -1;
 698         }
 699         if (!serial->type) {
 700                 pr_debug("%s - serial->type == NULL!\n", function);
 701                 return -1;
 702         }
 703
 704         return 0;
 705 }
 706
 707 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 708                                                  const char *function)
 709 {
 710         /* if no port was specified, or it fails a paranoia check */
 711         if (!port ||
 712             mos7840_port_paranoia_check(port, function) ||
 713             mos7840_serial_paranoia_check(port->serial, function)) {
 714                 /* then say that we don't have a valid usb_serial thing,
 715                  * which will end up genrating -ENODEV return values */
 716                 return NULL;
 717         }
 718
 719         return port->serial;
 720 }
 721
 722 /*****************************************************************************
 723  * mos7840_bulk_in_callback
 724  *      this is the callback function for when we have received data on the
 725  *      bulk in endpoint.
 726  *****************************************************************************/
 727
 728 static void mos7840_bulk_in_callback(struct urb *urb)
 729 {
 730         int retval;
 731         unsigned char *data;
 732         struct usb_serial *serial;
 733         struct usb_serial_port *port;
 734         struct moschip_port *mos7840_port;
 735         int status = urb->status;
 736
 737         mos7840_port = urb->context;
 738         if (!mos7840_port)
 739                 return;
 740
 741         if (status) {
 742                 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
 743                 mos7840_port->read_urb_busy = false;
 744                 return;
 745         }
 746
 747         port = mos7840_port->port;
 748         if (mos7840_port_paranoia_check(port, __func__)) {
 749                 mos7840_port->read_urb_busy = false;
 750                 return;
 751         }
 752
 753         serial = mos7840_get_usb_serial(port, __func__);
 754         if (!serial) {
 755                 mos7840_port->read_urb_busy = false;
 756                 return;
 757         }
 758
 759         data = urb->transfer_buffer;
 760         usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
 761
 762         if (urb->actual_length) {
 763                 struct tty_port *tport = &mos7840_port->port->port;
 764                 tty_insert_flip_string(tport, data, urb->actual_length);
 765                 tty_flip_buffer_push(tport);
 766                 port->icount.rx += urb->actual_length;
 767                 dev_dbg(&port->dev, "icount.rx is %d:\n", port->icount.rx);
 768         }
 769
 770         if (!mos7840_port->read_urb) {
 771                 dev_dbg(&port->dev, "%s", "URB KILLED !!!\n");
 772                 mos7840_port->read_urb_busy = false;
 773                 return;
 774         }
 775
 776         if (mos7840_port->has_led)
 777                 mos7840_led_activity(port);
 778
 779         mos7840_port->read_urb_busy = true;
 780         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 781
 782         if (retval) {
 783                 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
 784                 mos7840_port->read_urb_busy = false;
 785         }
 786 }
 787
 788 /*****************************************************************************
 789  * mos7840_bulk_out_data_callback
 790  *      this is the callback function for when we have finished sending
 791  *      serial data on the bulk out endpoint.
 792  *****************************************************************************/
 793
 794 static void mos7840_bulk_out_data_callback(struct urb *urb)
 795 {
 796         struct moschip_port *mos7840_port;
 797         struct usb_serial_port *port;
 798         int status = urb->status;
 799         unsigned long flags;
 800         int i;
 801
 802         mos7840_port = urb->context;
 803         port = mos7840_port->port;
 804         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
 805         for (i = 0; i < NUM_URBS; i++) {
 806                 if (urb == mos7840_port->write_urb_pool[i]) {
 807                         mos7840_port->busy[i] = 0;
 808                         break;
 809                 }
 810         }
 811         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
 812
 813         if (status) {
 814                 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
 815                 return;
 816         }
 817
 818         if (mos7840_port_paranoia_check(port, __func__))
 819                 return;
 820
 821         if (mos7840_port->open)
 822                 tty_port_tty_wakeup(&port->port);
 823
 824 }
 825
 826 /************************************************************************/
 827 /*       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       */
 828 /************************************************************************/
 829
 830 /*****************************************************************************
 831  * mos7840_open
 832  *      this function is called by the tty driver when a port is opened
 833  *      If successful, we return 0
 834  *      Otherwise we return a negative error number.
 835  *****************************************************************************/
 836
 837 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
 838 {
 839         int response;
 840         int j;
 841         struct usb_serial *serial;
 842         struct urb *urb;
 843         __u16 Data;
 844         int status;
 845         struct moschip_port *mos7840_port;
 846         struct moschip_port *port0;
 847
 848         if (mos7840_port_paranoia_check(port, __func__))
 849                 return -ENODEV;
 850
 851         serial = port->serial;
 852
 853         if (mos7840_serial_paranoia_check(serial, __func__))
 854                 return -ENODEV;
 855
 856         mos7840_port = mos7840_get_port_private(port);
 857         port0 = mos7840_get_port_private(serial->port[0]);
 858
 859         if (mos7840_port == NULL || port0 == NULL)
 860                 return -ENODEV;
 861
 862         usb_clear_halt(serial->dev, port->write_urb->pipe);
 863         usb_clear_halt(serial->dev, port->read_urb->pipe);
 864         port0->open_ports++;
 865
 866         /* Initialising the write urb pool */
 867         for (j = 0; j < NUM_URBS; ++j) {
 868                 urb = usb_alloc_urb(0, GFP_KERNEL);
 869                 mos7840_port->write_urb_pool[j] = urb;
 870                 if (!urb)
 871                         continue;
 872
 873                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 874                                                                 GFP_KERNEL);
 875                 if (!urb->transfer_buffer) {
 876                         usb_free_urb(urb);
 877                         mos7840_port->write_urb_pool[j] = NULL;
 878                         continue;
 879                 }
 880         }
 881
 882 /*****************************************************************************
 883  * Initialize MCS7840 -- Write Init values to corresponding Registers
 884  *
 885  * Register Index
 886  * 1 : IER
 887  * 2 : FCR
 888  * 3 : LCR
 889  * 4 : MCR
 890  *
 891  * 0x08 : SP1/2 Control Reg
 892  *****************************************************************************/
 893
 894         /* NEED to check the following Block */
 895
 896         Data = 0x0;
 897         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 898         if (status < 0) {
 899                 dev_dbg(&port->dev, "Reading Spreg failed\n");
 900                 goto err;
 901         }
 902         Data |= 0x80;
 903         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 904         if (status < 0) {
 905                 dev_dbg(&port->dev, "writing Spreg failed\n");
 906                 goto err;
 907         }
 908
 909         Data &= ~0x80;
 910         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 911         if (status < 0) {
 912                 dev_dbg(&port->dev, "writing Spreg failed\n");
 913                 goto err;
 914         }
 915         /* End of block to be checked */
 916
 917         Data = 0x0;
 918         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 919                                                                         &Data);
 920         if (status < 0) {
 921                 dev_dbg(&port->dev, "Reading Controlreg failed\n");
 922                 goto err;
 923         }
 924         Data |= 0x08;           /* Driver done bit */
 925         Data |= 0x20;           /* rx_disable */
 926         status = mos7840_set_reg_sync(port,
 927                                 mos7840_port->ControlRegOffset, Data);
 928         if (status < 0) {
 929                 dev_dbg(&port->dev, "writing Controlreg failed\n");
 930                 goto err;
 931         }
 932         /* do register settings here */
 933         /* Set all regs to the device default values. */
 934         /***********************************
 935          * First Disable all interrupts.
 936          ***********************************/
 937         Data = 0x00;
 938         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 939         if (status < 0) {
 940                 dev_dbg(&port->dev, "disabling interrupts failed\n");
 941                 goto err;
 942         }
 943         /* Set FIFO_CONTROL_REGISTER to the default value */
 944         Data = 0x00;
 945         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 946         if (status < 0) {
 947                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
 948                 goto err;
 949         }
 950
 951         Data = 0xcf;
 952         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 953         if (status < 0) {
 954                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
 955                 goto err;
 956         }
 957
 958         Data = 0x03;
 959         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 960         mos7840_port->shadowLCR = Data;
 961
 962         Data = 0x0b;
 963         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
 964         mos7840_port->shadowMCR = Data;
 965
 966         Data = 0x00;
 967         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 968         mos7840_port->shadowLCR = Data;
 969
 970         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
 971         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 972
 973         Data = 0x0c;
 974         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
 975
 976         Data = 0x0;
 977         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
 978
 979         Data = 0x00;
 980         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 981
 982         Data = Data & ~SERIAL_LCR_DLAB;
 983         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 984         mos7840_port->shadowLCR = Data;
 985
 986         /* clearing Bulkin and Bulkout Fifo */
 987         Data = 0x0;
 988         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 989
 990         Data = Data | 0x0c;
 991         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 992
 993         Data = Data & ~0x0c;
 994         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 995         /* Finally enable all interrupts */
 996         Data = 0x0c;
 997         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 998
 999         /* clearing rx_disable */
1000         Data = 0x0;
1001         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1002                                                                         &Data);
1003         Data = Data & ~0x20;
1004         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1005                                                                         Data);
1006
1007         /* rx_negate */
1008         Data = 0x0;
1009         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1010                                                                         &Data);
1011         Data = Data | 0x10;
1012         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1013                                                                         Data);
1014
1015         /* Check to see if we've set up our endpoint info yet    *
1016          * (can't set it up in mos7840_startup as the structures *
1017          * were not set up at that time.)                        */
1018         if (port0->open_ports == 1) {
1019                 /* FIXME: Buffer never NULL, so URB is not submitted. */
1020                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1021                         /* set up interrupt urb */
1022                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1023                                 serial->dev,
1024                                 usb_rcvintpipe(serial->dev,
1025                                 serial->port[0]->interrupt_in_endpointAddress),
1026                                 serial->port[0]->interrupt_in_buffer,
1027                                 serial->port[0]->interrupt_in_urb->
1028                                 transfer_buffer_length,
1029                                 mos7840_interrupt_callback,
1030                                 serial,
1031                                 serial->port[0]->interrupt_in_urb->interval);
1032
1033                         /* start interrupt read for mos7840 */
1034                         response =
1035                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1036                                            GFP_KERNEL);
1037                         if (response) {
1038                                 dev_err(&port->dev, "%s - Error %d submitting "
1039                                         "interrupt urb\n", __func__, response);
1040                         }
1041
1042                 }
1043
1044         }
1045
1046         /* see if we've set up our endpoint info yet   *
1047          * (can't set it up in mos7840_startup as the  *
1048          * structures were not set up at that time.)   */
1049
1050         dev_dbg(&port->dev, "port number is %d\n", port->port_number);
1051         dev_dbg(&port->dev, "minor number is %d\n", port->minor);
1052         dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
1053         dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
1054         dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
1055         dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
1056         mos7840_port->read_urb = port->read_urb;
1057
1058         /* set up our bulk in urb */
1059         if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1060                 usb_fill_bulk_urb(mos7840_port->read_urb,
1061                         serial->dev,
1062                         usb_rcvbulkpipe(serial->dev,
1063                                 (port->bulk_in_endpointAddress) + 2),
1064                         port->bulk_in_buffer,
1065                         mos7840_port->read_urb->transfer_buffer_length,
1066                         mos7840_bulk_in_callback, mos7840_port);
1067         } else {
1068                 usb_fill_bulk_urb(mos7840_port->read_urb,
1069                         serial->dev,
1070                         usb_rcvbulkpipe(serial->dev,
1071                                 port->bulk_in_endpointAddress),
1072                         port->bulk_in_buffer,
1073                         mos7840_port->read_urb->transfer_buffer_length,
1074                         mos7840_bulk_in_callback, mos7840_port);
1075         }
1076
1077         dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
1078         mos7840_port->read_urb_busy = true;
1079         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1080         if (response) {
1081                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1082                         __func__, response);
1083                 mos7840_port->read_urb_busy = false;
1084         }
1085
1086         /* initialize our port settings */
1087         /* Must set to enable ints! */
1088         mos7840_port->shadowMCR = MCR_MASTER_IE;
1089         /* send a open port command */
1090         mos7840_port->open = 1;
1091         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1092
1093         return 0;
1094 err:
1095         for (j = 0; j < NUM_URBS; ++j) {
1096                 urb = mos7840_port->write_urb_pool[j];
1097                 if (!urb)
1098                         continue;
1099                 kfree(urb->transfer_buffer);
1100                 usb_free_urb(urb);
1101         }
1102         return status;
1103 }
1104
1105 /*****************************************************************************
1106  * mos7840_chars_in_buffer
1107  *      this function is called by the tty driver when it wants to know how many
1108  *      bytes of data we currently have outstanding in the port (data that has
1109  *      been written, but hasn't made it out the port yet)
1110  *      If successful, we return the number of bytes left to be written in the
1111  *      system,
1112  *      Otherwise we return zero.
1113  *****************************************************************************/
1114
1115 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1116 {
1117         struct usb_serial_port *port = tty->driver_data;
1118         int i;
1119         int chars = 0;
1120         unsigned long flags;
1121         struct moschip_port *mos7840_port;
1122
1123         if (mos7840_port_paranoia_check(port, __func__))
1124                 return 0;
1125
1126         mos7840_port = mos7840_get_port_private(port);
1127         if (mos7840_port == NULL)
1128                 return 0;
1129
1130         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1131         for (i = 0; i < NUM_URBS; ++i) {
1132                 if (mos7840_port->busy[i]) {
1133                         struct urb *urb = mos7840_port->write_urb_pool[i];
1134                         chars += urb->transfer_buffer_length;
1135                 }
1136         }
1137         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1138         dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1139         return chars;
1140
1141 }
1142
1143 /*****************************************************************************
1144  * mos7840_close
1145  *      this function is called by the tty driver when a port is closed
1146  *****************************************************************************/
1147
1148 static void mos7840_close(struct usb_serial_port *port)
1149 {
1150         struct usb_serial *serial;
1151         struct moschip_port *mos7840_port;
1152         struct moschip_port *port0;
1153         int j;
1154         __u16 Data;
1155
1156         if (mos7840_port_paranoia_check(port, __func__))
1157                 return;
1158
1159         serial = mos7840_get_usb_serial(port, __func__);
1160         if (!serial)
1161                 return;
1162
1163         mos7840_port = mos7840_get_port_private(port);
1164         port0 = mos7840_get_port_private(serial->port[0]);
1165
1166         if (mos7840_port == NULL || port0 == NULL)
1167                 return;
1168
1169         for (j = 0; j < NUM_URBS; ++j)
1170                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1171
1172         /* Freeing Write URBs */
1173         for (j = 0; j < NUM_URBS; ++j) {
1174                 if (mos7840_port->write_urb_pool[j]) {
1175                         kfree(mos7840_port->write_urb_pool[j]->transfer_buffer);
1176                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1177                 }
1178         }
1179
1180         usb_kill_urb(mos7840_port->read_urb);
1181         mos7840_port->read_urb_busy = false;
1182
1183         port0->open_ports--;
1184         dev_dbg(&port->dev, "%s in close%d\n", __func__, port0->open_ports);
1185         if (port0->open_ports == 0) {
1186                 if (serial->port[0]->interrupt_in_urb) {
1187                         dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n");
1188                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1189                 }
1190         }
1191
1192         Data = 0x0;
1193         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1194
1195         Data = 0x00;
1196         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1197
1198         mos7840_port->open = 0;
1199 }
1200
1201 /*****************************************************************************
1202  * mos7840_break
1203  *      this function sends a break to the port
1204  *****************************************************************************/
1205 static void mos7840_break(struct tty_struct *tty, int break_state)
1206 {
1207         struct usb_serial_port *port = tty->driver_data;
1208         unsigned char data;
1209         struct usb_serial *serial;
1210         struct moschip_port *mos7840_port;
1211
1212         if (mos7840_port_paranoia_check(port, __func__))
1213                 return;
1214
1215         serial = mos7840_get_usb_serial(port, __func__);
1216         if (!serial)
1217                 return;
1218
1219         mos7840_port = mos7840_get_port_private(port);
1220
1221         if (mos7840_port == NULL)
1222                 return;
1223
1224         if (break_state == -1)
1225                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1226         else
1227                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1228
1229         /* FIXME: no locking on shadowLCR anywhere in driver */
1230         mos7840_port->shadowLCR = data;
1231         dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1232         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1233                              mos7840_port->shadowLCR);
1234 }
1235
1236 /*****************************************************************************
1237  * mos7840_write_room
1238  *      this function is called by the tty driver when it wants to know how many
1239  *      bytes of data we can accept for a specific port.
1240  *      If successful, we return the amount of room that we have for this port
1241  *      Otherwise we return a negative error number.
1242  *****************************************************************************/
1243
1244 static int mos7840_write_room(struct tty_struct *tty)
1245 {
1246         struct usb_serial_port *port = tty->driver_data;
1247         int i;
1248         int room = 0;
1249         unsigned long flags;
1250         struct moschip_port *mos7840_port;
1251
1252         if (mos7840_port_paranoia_check(port, __func__))
1253                 return -1;
1254
1255         mos7840_port = mos7840_get_port_private(port);
1256         if (mos7840_port == NULL)
1257                 return -1;
1258
1259         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1260         for (i = 0; i < NUM_URBS; ++i) {
1261                 if (!mos7840_port->busy[i])
1262                         room += URB_TRANSFER_BUFFER_SIZE;
1263         }
1264         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1265
1266         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1267         dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room);
1268         return room;
1269
1270 }
1271
1272 /*****************************************************************************
1273  * mos7840_write
1274  *      this function is called by the tty driver when data should be written to
1275  *      the port.
1276  *      If successful, we return the number of bytes written, otherwise we
1277  *      return a negative error number.
1278  *****************************************************************************/
1279
1280 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1281                          const unsigned char *data, int count)
1282 {
1283         int status;
1284         int i;
1285         int bytes_sent = 0;
1286         int transfer_size;
1287         unsigned long flags;
1288
1289         struct moschip_port *mos7840_port;
1290         struct usb_serial *serial;
1291         struct urb *urb;
1292         /* __u16 Data; */
1293         const unsigned char *current_position = data;
1294
1295         if (mos7840_port_paranoia_check(port, __func__))
1296                 return -1;
1297
1298         serial = port->serial;
1299         if (mos7840_serial_paranoia_check(serial, __func__))
1300                 return -1;
1301
1302         mos7840_port = mos7840_get_port_private(port);
1303         if (mos7840_port == NULL)
1304                 return -1;
1305
1306         /* try to find a free urb in the list */
1307         urb = NULL;
1308
1309         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1310         for (i = 0; i < NUM_URBS; ++i) {
1311                 if (!mos7840_port->busy[i]) {
1312                         mos7840_port->busy[i] = 1;
1313                         urb = mos7840_port->write_urb_pool[i];
1314                         dev_dbg(&port->dev, "URB:%d\n", i);
1315                         break;
1316                 }
1317         }
1318         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1319
1320         if (urb == NULL) {
1321                 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1322                 goto exit;
1323         }
1324
1325         if (urb->transfer_buffer == NULL) {
1326                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1327                                                GFP_ATOMIC);
1328                 if (!urb->transfer_buffer)
1329                         goto exit;
1330         }
1331         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1332
1333         memcpy(urb->transfer_buffer, current_position, transfer_size);
1334
1335         /* fill urb with data and submit  */
1336         if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1337                 usb_fill_bulk_urb(urb,
1338                         serial->dev,
1339                         usb_sndbulkpipe(serial->dev,
1340                                 (port->bulk_out_endpointAddress) + 2),
1341                         urb->transfer_buffer,
1342                         transfer_size,
1343                         mos7840_bulk_out_data_callback, mos7840_port);
1344         } else {
1345                 usb_fill_bulk_urb(urb,
1346                         serial->dev,
1347                         usb_sndbulkpipe(serial->dev,
1348                                 port->bulk_out_endpointAddress),
1349                         urb->transfer_buffer,
1350                         transfer_size,
1351                         mos7840_bulk_out_data_callback, mos7840_port);
1352         }
1353
1354         dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
1355
1356         if (mos7840_port->has_led)
1357                 mos7840_led_activity(port);
1358
1359         /* send it down the pipe */
1360         status = usb_submit_urb(urb, GFP_ATOMIC);
1361
1362         if (status) {
1363                 mos7840_port->busy[i] = 0;
1364                 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1365                         "with status = %d\n", __func__, status);
1366                 bytes_sent = status;
1367                 goto exit;
1368         }
1369         bytes_sent = transfer_size;
1370         port->icount.tx += transfer_size;
1371         dev_dbg(&port->dev, "icount.tx is %d:\n", port->icount.tx);
1372 exit:
1373         return bytes_sent;
1374
1375 }
1376
1377 /*****************************************************************************
1378  * mos7840_throttle
1379  *      this function is called by the tty driver when it wants to stop the data
1380  *      being read from the port.
1381  *****************************************************************************/
1382
1383 static void mos7840_throttle(struct tty_struct *tty)
1384 {
1385         struct usb_serial_port *port = tty->driver_data;
1386         struct moschip_port *mos7840_port;
1387         int status;
1388
1389         if (mos7840_port_paranoia_check(port, __func__))
1390                 return;
1391
1392         mos7840_port = mos7840_get_port_private(port);
1393
1394         if (mos7840_port == NULL)
1395                 return;
1396
1397         if (!mos7840_port->open) {
1398                 dev_dbg(&port->dev, "%s", "port not opened\n");
1399                 return;
1400         }
1401
1402         /* if we are implementing XON/XOFF, send the stop character */
1403         if (I_IXOFF(tty)) {
1404                 unsigned char stop_char = STOP_CHAR(tty);
1405                 status = mos7840_write(tty, port, &stop_char, 1);
1406                 if (status <= 0)
1407                         return;
1408         }
1409         /* if we are implementing RTS/CTS, toggle that line */
1410         if (C_CRTSCTS(tty)) {
1411                 mos7840_port->shadowMCR &= ~MCR_RTS;
1412                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1413                                          mos7840_port->shadowMCR);
1414                 if (status < 0)
1415                         return;
1416         }
1417 }
1418
1419 /*****************************************************************************
1420  * mos7840_unthrottle
1421  *      this function is called by the tty driver when it wants to resume
1422  *      the data being read from the port (called after mos7840_throttle is
1423  *      called)
1424  *****************************************************************************/
1425 static void mos7840_unthrottle(struct tty_struct *tty)
1426 {
1427         struct usb_serial_port *port = tty->driver_data;
1428         int status;
1429         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1430
1431         if (mos7840_port_paranoia_check(port, __func__))
1432                 return;
1433
1434         if (mos7840_port == NULL)
1435                 return;
1436
1437         if (!mos7840_port->open) {
1438                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1439                 return;
1440         }
1441
1442         /* if we are implementing XON/XOFF, send the start character */
1443         if (I_IXOFF(tty)) {
1444                 unsigned char start_char = START_CHAR(tty);
1445                 status = mos7840_write(tty, port, &start_char, 1);
1446                 if (status <= 0)
1447                         return;
1448         }
1449
1450         /* if we are implementing RTS/CTS, toggle that line */
1451         if (C_CRTSCTS(tty)) {
1452                 mos7840_port->shadowMCR |= MCR_RTS;
1453                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1454                                          mos7840_port->shadowMCR);
1455                 if (status < 0)
1456                         return;
1457         }
1458 }
1459
1460 static int mos7840_tiocmget(struct tty_struct *tty)
1461 {
1462         struct usb_serial_port *port = tty->driver_data;
1463         struct moschip_port *mos7840_port;
1464         unsigned int result;
1465         __u16 msr;
1466         __u16 mcr;
1467         int status;
1468         mos7840_port = mos7840_get_port_private(port);
1469
1470         if (mos7840_port == NULL)
1471                 return -ENODEV;
1472
1473         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1474         if (status < 0)
1475                 return -EIO;
1476         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1477         if (status < 0)
1478                 return -EIO;
1479         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1480             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1481             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1482             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1483             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1484             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1485             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1486
1487         dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1488
1489         return result;
1490 }
1491
1492 static int mos7840_tiocmset(struct tty_struct *tty,
1493                             unsigned int set, unsigned int clear)
1494 {
1495         struct usb_serial_port *port = tty->driver_data;
1496         struct moschip_port *mos7840_port;
1497         unsigned int mcr;
1498         int status;
1499
1500         mos7840_port = mos7840_get_port_private(port);
1501
1502         if (mos7840_port == NULL)
1503                 return -ENODEV;
1504
1505         /* FIXME: What locks the port registers ? */
1506         mcr = mos7840_port->shadowMCR;
1507         if (clear & TIOCM_RTS)
1508                 mcr &= ~MCR_RTS;
1509         if (clear & TIOCM_DTR)
1510                 mcr &= ~MCR_DTR;
1511         if (clear & TIOCM_LOOP)
1512                 mcr &= ~MCR_LOOPBACK;
1513
1514         if (set & TIOCM_RTS)
1515                 mcr |= MCR_RTS;
1516         if (set & TIOCM_DTR)
1517                 mcr |= MCR_DTR;
1518         if (set & TIOCM_LOOP)
1519                 mcr |= MCR_LOOPBACK;
1520
1521         mos7840_port->shadowMCR = mcr;
1522
1523         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1524         if (status < 0) {
1525                 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1526                 return status;
1527         }
1528
1529         return 0;
1530 }
1531
1532 /*****************************************************************************
1533  * mos7840_calc_baud_rate_divisor
1534  *      this function calculates the proper baud rate divisor for the specified
1535  *      baud rate.
1536  *****************************************************************************/
1537 static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1538                                           int baudRate, int *divisor,
1539                                           __u16 *clk_sel_val)
1540 {
1541         dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1542
1543         if (baudRate <= 115200) {
1544                 *divisor = 115200 / baudRate;
1545                 *clk_sel_val = 0x0;
1546         }
1547         if ((baudRate > 115200) && (baudRate <= 230400)) {
1548                 *divisor = 230400 / baudRate;
1549                 *clk_sel_val = 0x10;
1550         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1551                 *divisor = 403200 / baudRate;
1552                 *clk_sel_val = 0x20;
1553         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1554                 *divisor = 460800 / baudRate;
1555                 *clk_sel_val = 0x30;
1556         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1557                 *divisor = 806400 / baudRate;
1558                 *clk_sel_val = 0x40;
1559         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1560                 *divisor = 921600 / baudRate;
1561                 *clk_sel_val = 0x50;
1562         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1563                 *divisor = 1572864 / baudRate;
1564                 *clk_sel_val = 0x60;
1565         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1566                 *divisor = 3145728 / baudRate;
1567                 *clk_sel_val = 0x70;
1568         }
1569         return 0;
1570 }
1571
1572 /*****************************************************************************
1573  * mos7840_send_cmd_write_baud_rate
1574  *      this function sends the proper command to change the baud rate of the
1575  *      specified port.
1576  *****************************************************************************/
1577
1578 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1579                                             int baudRate)
1580 {
1581         int divisor = 0;
1582         int status;
1583         __u16 Data;
1584         __u16 clk_sel_val;
1585         struct usb_serial_port *port;
1586
1587         if (mos7840_port == NULL)
1588                 return -1;
1589
1590         port = mos7840_port->port;
1591         if (mos7840_port_paranoia_check(port, __func__))
1592                 return -1;
1593
1594         if (mos7840_serial_paranoia_check(port->serial, __func__))
1595                 return -1;
1596
1597         dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudRate);
1598         /* reset clk_uart_sel in spregOffset */
1599         if (baudRate > 115200) {
1600 #ifdef HW_flow_control
1601                 /* NOTE: need to see the pther register to modify */
1602                 /* setting h/w flow control bit to 1 */
1603                 Data = 0x2b;
1604                 mos7840_port->shadowMCR = Data;
1605                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1606                                                                         Data);
1607                 if (status < 0) {
1608                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1609                         return -1;
1610                 }
1611 #endif
1612
1613         } else {
1614 #ifdef HW_flow_control
1615                 /* setting h/w flow control bit to 0 */
1616                 Data = 0xb;
1617                 mos7840_port->shadowMCR = Data;
1618                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1619                                                                         Data);
1620                 if (status < 0) {
1621                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1622                         return -1;
1623                 }
1624 #endif
1625
1626         }
1627
1628         if (1) {                /* baudRate <= 115200) */
1629                 clk_sel_val = 0x0;
1630                 Data = 0x0;
1631                 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1632                                                    &clk_sel_val);
1633                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1634                                                                  &Data);
1635                 if (status < 0) {
1636                         dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1637                         return -1;
1638                 }
1639                 Data = (Data & 0x8f) | clk_sel_val;
1640                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1641                                                                 Data);
1642                 if (status < 0) {
1643                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1644                         return -1;
1645                 }
1646                 /* Calculate the Divisor */
1647
1648                 if (status) {
1649                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1650                         return status;
1651                 }
1652                 /* Enable access to divisor latch */
1653                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1654                 mos7840_port->shadowLCR = Data;
1655                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1656
1657                 /* Write the divisor */
1658                 Data = (unsigned char)(divisor & 0xff);
1659                 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1660                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1661
1662                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1663                 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1664                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1665
1666                 /* Disable access to divisor latch */
1667                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1668                 mos7840_port->shadowLCR = Data;
1669                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1670
1671         }
1672         return status;
1673 }
1674
1675 /*****************************************************************************
1676  * mos7840_change_port_settings
1677  *      This routine is called to set the UART on the device to match
1678  *      the specified new settings.
1679  *****************************************************************************/
1680
1681 static void mos7840_change_port_settings(struct tty_struct *tty,
1682         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1683 {
1684         int baud;
1685         unsigned cflag;
1686         __u8 lData;
1687         __u8 lParity;
1688         __u8 lStop;
1689         int status;
1690         __u16 Data;
1691         struct usb_serial_port *port;
1692
1693         if (mos7840_port == NULL)
1694                 return;
1695
1696         port = mos7840_port->port;
1697
1698         if (mos7840_port_paranoia_check(port, __func__))
1699                 return;
1700
1701         if (mos7840_serial_paranoia_check(port->serial, __func__))
1702                 return;
1703
1704         if (!mos7840_port->open) {
1705                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1706                 return;
1707         }
1708
1709         lData = LCR_BITS_8;
1710         lStop = LCR_STOP_1;
1711         lParity = LCR_PAR_NONE;
1712
1713         cflag = tty->termios.c_cflag;
1714
1715         /* Change the number of bits */
1716         switch (cflag & CSIZE) {
1717         case CS5:
1718                 lData = LCR_BITS_5;
1719                 break;
1720
1721         case CS6:
1722                 lData = LCR_BITS_6;
1723                 break;
1724
1725         case CS7:
1726                 lData = LCR_BITS_7;
1727                 break;
1728
1729         default:
1730         case CS8:
1731                 lData = LCR_BITS_8;
1732                 break;
1733         }
1734
1735         /* Change the Parity bit */
1736         if (cflag & PARENB) {
1737                 if (cflag & PARODD) {
1738                         lParity = LCR_PAR_ODD;
1739                         dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1740                 } else {
1741                         lParity = LCR_PAR_EVEN;
1742                         dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1743                 }
1744
1745         } else {
1746                 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1747         }
1748
1749         if (cflag & CMSPAR)
1750                 lParity = lParity | 0x20;
1751
1752         /* Change the Stop bit */
1753         if (cflag & CSTOPB) {
1754                 lStop = LCR_STOP_2;
1755                 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1756         } else {
1757                 lStop = LCR_STOP_1;
1758                 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1759         }
1760
1761         /* Update the LCR with the correct value */
1762         mos7840_port->shadowLCR &=
1763             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1764         mos7840_port->shadowLCR |= (lData | lParity | lStop);
1765
1766         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1767                 mos7840_port->shadowLCR);
1768         /* Disable Interrupts */
1769         Data = 0x00;
1770         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1771
1772         Data = 0x00;
1773         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1774
1775         Data = 0xcf;
1776         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1777
1778         /* Send the updated LCR value to the mos7840 */
1779         Data = mos7840_port->shadowLCR;
1780
1781         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1782
1783         Data = 0x00b;
1784         mos7840_port->shadowMCR = Data;
1785         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1786         Data = 0x00b;
1787         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1788
1789         /* set up the MCR register and send it to the mos7840 */
1790
1791         mos7840_port->shadowMCR = MCR_MASTER_IE;
1792         if (cflag & CBAUD)
1793                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1794
1795         if (cflag & CRTSCTS)
1796                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1797         else
1798                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1799
1800         Data = mos7840_port->shadowMCR;
1801         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1802
1803         /* Determine divisor based on baud rate */
1804         baud = tty_get_baud_rate(tty);
1805
1806         if (!baud) {
1807                 /* pick a default, any default... */
1808                 dev_dbg(&port->dev, "%s", "Picked default baud...\n");
1809                 baud = 9600;
1810         }
1811
1812         dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1813         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
1814
1815         /* Enable Interrupts */
1816         Data = 0x0c;
1817         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1818
1819         if (!mos7840_port->read_urb_busy) {
1820                 mos7840_port->read_urb_busy = true;
1821                 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1822                 if (status) {
1823                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1824                             status);
1825                         mos7840_port->read_urb_busy = false;
1826                 }
1827         }
1828         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
1829                 mos7840_port->shadowLCR);
1830 }
1831
1832 /*****************************************************************************
1833  * mos7840_set_termios
1834  *      this function is called by the tty driver when it wants to change
1835  *      the termios structure
1836  *****************************************************************************/
1837
1838 static void mos7840_set_termios(struct tty_struct *tty,
1839                                 struct usb_serial_port *port,
1840                                 struct ktermios *old_termios)
1841 {
1842         int status;
1843         struct usb_serial *serial;
1844         struct moschip_port *mos7840_port;
1845
1846         if (mos7840_port_paranoia_check(port, __func__))
1847                 return;
1848
1849         serial = port->serial;
1850
1851         if (mos7840_serial_paranoia_check(serial, __func__))
1852                 return;
1853
1854         mos7840_port = mos7840_get_port_private(port);
1855
1856         if (mos7840_port == NULL)
1857                 return;
1858
1859         if (!mos7840_port->open) {
1860                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1861                 return;
1862         }
1863
1864         /* change the port settings to the new ones specified */
1865
1866         mos7840_change_port_settings(tty, mos7840_port, old_termios);
1867
1868         if (!mos7840_port->read_urb) {
1869                 dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n");
1870                 return;
1871         }
1872
1873         if (!mos7840_port->read_urb_busy) {
1874                 mos7840_port->read_urb_busy = true;
1875                 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1876                 if (status) {
1877                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1878                             status);
1879                         mos7840_port->read_urb_busy = false;
1880                 }
1881         }
1882 }
1883
1884 /*****************************************************************************
1885  * mos7840_get_lsr_info - get line status register info
1886  *
1887  * Purpose: Let user call ioctl() to get info when the UART physically
1888  *          is emptied.  On bus types like RS485, the transmitter must
1889  *          release the bus after transmitting. This must be done when
1890  *          the transmit shift register is empty, not be done when the
1891  *          transmit holding register is empty.  This functionality
1892  *          allows an RS485 driver to be written in user space.
1893  *****************************************************************************/
1894
1895 static int mos7840_get_lsr_info(struct tty_struct *tty,
1896                                 unsigned int __user *value)
1897 {
1898         int count;
1899         unsigned int result = 0;
1900
1901         count = mos7840_chars_in_buffer(tty);
1902         if (count == 0)
1903                 result = TIOCSER_TEMT;
1904
1905         if (copy_to_user(value, &result, sizeof(int)))
1906                 return -EFAULT;
1907         return 0;
1908 }
1909
1910 /*****************************************************************************
1911  * mos7840_get_serial_info
1912  *      function to get information about serial port
1913  *****************************************************************************/
1914
1915 static int mos7840_get_serial_info(struct tty_struct *tty,
1916                                    struct serial_struct *ss)
1917 {
1918         struct usb_serial_port *port = tty->driver_data;
1919         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1920
1921         ss->type = PORT_16550A;
1922         ss->line = mos7840_port->port->minor;
1923         ss->port = mos7840_port->port->port_number;
1924         ss->irq = 0;
1925         ss->xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1926         ss->baud_base = 9600;
1927         ss->close_delay = 5 * HZ;
1928         ss->closing_wait = 30 * HZ;
1929         return 0;
1930 }
1931
1932 /*****************************************************************************
1933  * SerialIoctl
1934  *      this function handles any ioctl calls to the driver
1935  *****************************************************************************/
1936
1937 static int mos7840_ioctl(struct tty_struct *tty,
1938                          unsigned int cmd, unsigned long arg)
1939 {
1940         struct usb_serial_port *port = tty->driver_data;
1941         void __user *argp = (void __user *)arg;
1942         struct moschip_port *mos7840_port;
1943
1944         if (mos7840_port_paranoia_check(port, __func__))
1945                 return -1;
1946
1947         mos7840_port = mos7840_get_port_private(port);
1948
1949         if (mos7840_port == NULL)
1950                 return -1;
1951
1952         switch (cmd) {
1953                 /* return number of bytes available */
1954
1955         case TIOCSERGETLSR:
1956                 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
1957                 return mos7840_get_lsr_info(tty, argp);
1958
1959         default:
1960                 break;
1961         }
1962         return -ENOIOCTLCMD;
1963 }
1964
1965 static int mos7810_check(struct usb_serial *serial)
1966 {
1967         int i, pass_count = 0;
1968         u8 *buf;
1969         __u16 data = 0, mcr_data = 0;
1970         __u16 test_pattern = 0x55AA;
1971         int res;
1972
1973         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
1974         if (!buf)
1975                 return 0;       /* failed to identify 7810 */
1976
1977         /* Store MCR setting */
1978         res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
1979                 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
1980                 buf, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
1981         if (res == VENDOR_READ_LENGTH)
1982                 mcr_data = *buf;
1983
1984         for (i = 0; i < 16; i++) {
1985                 /* Send the 1-bit test pattern out to MCS7810 test pin */
1986                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1987                         MCS_WRREQ, MCS_WR_RTYPE,
1988                         (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
1989                         MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
1990
1991                 /* Read the test pattern back */
1992                 res = usb_control_msg(serial->dev,
1993                                 usb_rcvctrlpipe(serial->dev, 0), MCS_RDREQ,
1994                                 MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
1995                                 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
1996                 if (res == VENDOR_READ_LENGTH)
1997                         data = *buf;
1998
1999                 /* If this is a MCS7810 device, both test patterns must match */
2000                 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
2001                         break;
2002
2003                 pass_count++;
2004         }
2005
2006         /* Restore MCR setting */
2007         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
2008                 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
2009                 0, MOS_WDR_TIMEOUT);
2010
2011         kfree(buf);
2012
2013         if (pass_count == 16)
2014                 return 1;
2015
2016         return 0;
2017 }
2018
2019 static int mos7840_probe(struct usb_serial *serial,
2020                                 const struct usb_device_id *id)
2021 {
2022         u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
2023         u8 *buf;
2024         int device_type;
2025
2026         if (product == MOSCHIP_DEVICE_ID_7810 ||
2027                 product == MOSCHIP_DEVICE_ID_7820 ||
2028                 product == MOSCHIP_DEVICE_ID_7843) {
2029                 device_type = product;
2030                 goto out;
2031         }
2032
2033         buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2034         if (!buf)
2035                 return -ENOMEM;
2036
2037         usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2038                         MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2039                         VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2040
2041         /* For a MCS7840 device GPIO0 must be set to 1 */
2042         if (buf[0] & 0x01)
2043                 device_type = MOSCHIP_DEVICE_ID_7840;
2044         else if (mos7810_check(serial))
2045                 device_type = MOSCHIP_DEVICE_ID_7810;
2046         else
2047                 device_type = MOSCHIP_DEVICE_ID_7820;
2048
2049         kfree(buf);
2050 out:
2051         usb_set_serial_data(serial, (void *)(unsigned long)device_type);
2052
2053         return 0;
2054 }
2055
2056 static int mos7840_calc_num_ports(struct usb_serial *serial,
2057                                         struct usb_serial_endpoints *epds)
2058 {
2059         int device_type = (unsigned long)usb_get_serial_data(serial);
2060         int num_ports;
2061
2062         if (device_type == MOSCHIP_DEVICE_ID_7843)
2063                 num_ports = 3;
2064         else
2065                 num_ports = (device_type >> 4) & 0x000F;
2066
2067         /*
2068          * num_ports is currently never zero as device_type is one of
2069          * MOSCHIP_DEVICE_ID_78{1,2,4}0.
2070          */
2071         if (num_ports == 0)
2072                 return -ENODEV;
2073
2074         if (epds->num_bulk_in < num_ports || epds->num_bulk_out < num_ports) {
2075                 dev_err(&serial->interface->dev, "missing endpoints\n");
2076                 return -ENODEV;
2077         }
2078
2079         return num_ports;
2080 }
2081
2082 static int mos7840_port_probe(struct usb_serial_port *port)
2083 {
2084         struct usb_serial *serial = port->serial;
2085         int device_type = (unsigned long)usb_get_serial_data(serial);
2086         struct moschip_port *mos7840_port;
2087         int status;
2088         int pnum;
2089         __u16 Data;
2090
2091         /* we set up the pointers to the endpoints in the mos7840_open *
2092          * function, as the structures aren't created yet.             */
2093
2094         pnum = port->port_number;
2095
2096         dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
2097         mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2098         if (!mos7840_port)
2099                 return -ENOMEM;
2100
2101         /* Initialize all port interrupt end point to port 0 int
2102          * endpoint. Our device has only one interrupt end point
2103          * common to all port */
2104
2105         mos7840_port->port = port;
2106         mos7840_set_port_private(port, mos7840_port);
2107         spin_lock_init(&mos7840_port->pool_lock);
2108
2109         /* minor is not initialised until later by
2110          * usb-serial.c:get_free_serial() and cannot therefore be used
2111          * to index device instances */
2112         mos7840_port->port_num = pnum + 1;
2113         dev_dbg(&port->dev, "port->minor = %d\n", port->minor);
2114         dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
2115
2116         if (mos7840_port->port_num == 1) {
2117                 mos7840_port->SpRegOffset = 0x0;
2118                 mos7840_port->ControlRegOffset = 0x1;
2119                 mos7840_port->DcrRegOffset = 0x4;
2120         } else {
2121                 u8 phy_num = mos7840_port->port_num;
2122
2123                 /* Port 2 in the 2-port case uses registers of port 3 */
2124                 if (serial->num_ports == 2)
2125                         phy_num = 3;
2126
2127                 mos7840_port->SpRegOffset = 0x8 + 2 * (phy_num - 2);
2128                 mos7840_port->ControlRegOffset = 0x9 + 2 * (phy_num - 2);
2129                 mos7840_port->DcrRegOffset = 0x16 + 3 * (phy_num - 2);
2130         }
2131         mos7840_dump_serial_port(port, mos7840_port);
2132         mos7840_set_port_private(port, mos7840_port);
2133
2134         /* enable rx_disable bit in control register */
2135         status = mos7840_get_reg_sync(port,
2136                         mos7840_port->ControlRegOffset, &Data);
2137         if (status < 0) {
2138                 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
2139                 goto out;
2140         } else
2141                 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
2142         Data |= 0x08;   /* setting driver done bit */
2143         Data |= 0x04;   /* sp1_bit to have cts change reflect in
2144                            modem status reg */
2145
2146         /* Data |= 0x20; //rx_disable bit */
2147         status = mos7840_set_reg_sync(port,
2148                         mos7840_port->ControlRegOffset, Data);
2149         if (status < 0) {
2150                 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2151                 goto out;
2152         } else
2153                 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
2154
2155         /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2156            and 0x24 in DCR3 */
2157         Data = 0x01;
2158         status = mos7840_set_reg_sync(port,
2159                         (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2160         if (status < 0) {
2161                 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
2162                 goto out;
2163         } else
2164                 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
2165
2166         Data = 0x05;
2167         status = mos7840_set_reg_sync(port,
2168                         (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2169         if (status < 0) {
2170                 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
2171                 goto out;
2172         } else
2173                 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
2174
2175         Data = 0x24;
2176         status = mos7840_set_reg_sync(port,
2177                         (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2178         if (status < 0) {
2179                 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
2180                 goto out;
2181         } else
2182                 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
2183
2184         /* write values in clkstart0x0 and clkmulti 0x20 */
2185         Data = 0x0;
2186         status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
2187         if (status < 0) {
2188                 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2189                 goto out;
2190         } else
2191                 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2192
2193         Data = 0x20;
2194         status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
2195         if (status < 0) {
2196                 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
2197                 goto error;
2198         } else
2199                 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
2200
2201         /* write value 0x0 to scratchpad register */
2202         Data = 0x00;
2203         status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
2204         if (status < 0) {
2205                 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
2206                 goto out;
2207         } else
2208                 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
2209
2210         /* Zero Length flag register */
2211         if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
2212                 Data = 0xff;
2213                 status = mos7840_set_reg_sync(port,
2214                                 (__u16) (ZLP_REG1 +
2215                                         ((__u16)mos7840_port->port_num)), Data);
2216                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2217                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
2218                 if (status < 0) {
2219                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
2220                         goto out;
2221                 } else
2222                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
2223         } else {
2224                 Data = 0xff;
2225                 status = mos7840_set_reg_sync(port,
2226                                 (__u16) (ZLP_REG1 +
2227                                         ((__u16)mos7840_port->port_num) - 0x1), Data);
2228                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2229                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
2230                 if (status < 0) {
2231                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
2232                         goto out;
2233                 } else
2234                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
2235
2236         }
2237         mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2238         mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2239         mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2240                         GFP_KERNEL);
2241         if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2242                         !mos7840_port->dr) {
2243                 status = -ENOMEM;
2244                 goto error;
2245         }
2246
2247         mos7840_port->has_led = false;
2248
2249         /* Initialize LED timers */
2250         if (device_type == MOSCHIP_DEVICE_ID_7810) {
2251                 mos7840_port->has_led = true;
2252
2253                 mos7840_port->led_urb = usb_alloc_urb(0, GFP_KERNEL);
2254                 mos7840_port->led_dr = kmalloc(sizeof(*mos7840_port->led_dr),
2255                                                                 GFP_KERNEL);
2256                 if (!mos7840_port->led_urb || !mos7840_port->led_dr) {
2257                         status = -ENOMEM;
2258                         goto error;
2259                 }
2260
2261                 timer_setup(&mos7840_port->led_timer1, mos7840_led_off, 0);
2262                 mos7840_port->led_timer1.expires =
2263                         jiffies + msecs_to_jiffies(LED_ON_MS);
2264                 timer_setup(&mos7840_port->led_timer2, mos7840_led_flag_off,
2265                             0);
2266                 mos7840_port->led_timer2.expires =
2267                         jiffies + msecs_to_jiffies(LED_OFF_MS);
2268
2269                 /* Turn off LED */
2270                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2271         }
2272 out:
2273         if (pnum == serial->num_ports - 1) {
2274                 /* Zero Length flag enable */
2275                 Data = 0x0f;
2276                 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2277                 if (status < 0) {
2278                         dev_dbg(&port->dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
2279                         goto error;
2280                 } else
2281                         dev_dbg(&port->dev, "ZLP_REG5 Writing success status%d\n", status);
2282
2283                 /* setting configuration feature to one */
2284                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2285                                 0x03, 0x00, 0x01, 0x00, NULL, 0x00,
2286                                 MOS_WDR_TIMEOUT);
2287         }
2288         return 0;
2289 error:
2290         kfree(mos7840_port->led_dr);
2291         usb_free_urb(mos7840_port->led_urb);
2292         kfree(mos7840_port->dr);
2293         kfree(mos7840_port->ctrl_buf);
2294         usb_free_urb(mos7840_port->control_urb);
2295         kfree(mos7840_port);
2296
2297         return status;
2298 }
2299
2300 static int mos7840_port_remove(struct usb_serial_port *port)
2301 {
2302         struct moschip_port *mos7840_port;
2303
2304         mos7840_port = mos7840_get_port_private(port);
2305
2306         if (mos7840_port->has_led) {
2307                 /* Turn off LED */
2308                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2309
2310                 del_timer_sync(&mos7840_port->led_timer1);
2311                 del_timer_sync(&mos7840_port->led_timer2);
2312
2313                 usb_kill_urb(mos7840_port->led_urb);
2314                 usb_free_urb(mos7840_port->led_urb);
2315                 kfree(mos7840_port->led_dr);
2316         }
2317         usb_kill_urb(mos7840_port->control_urb);
2318         usb_free_urb(mos7840_port->control_urb);
2319         kfree(mos7840_port->ctrl_buf);
2320         kfree(mos7840_port->dr);
2321         kfree(mos7840_port);
2322
2323         return 0;
2324 }
2325
2326 static struct usb_serial_driver moschip7840_4port_device = {
2327         .driver = {
2328                    .owner = THIS_MODULE,
2329                    .name = "mos7840",
2330                    },
2331         .description = DRIVER_DESC,
2332         .id_table = id_table,
2333         .num_interrupt_in = 1,
2334         .open = mos7840_open,
2335         .close = mos7840_close,
2336         .write = mos7840_write,
2337         .write_room = mos7840_write_room,
2338         .chars_in_buffer = mos7840_chars_in_buffer,
2339         .throttle = mos7840_throttle,
2340         .unthrottle = mos7840_unthrottle,
2341         .calc_num_ports = mos7840_calc_num_ports,
2342         .probe = mos7840_probe,
2343         .ioctl = mos7840_ioctl,
2344         .get_serial = mos7840_get_serial_info,
2345         .set_termios = mos7840_set_termios,
2346         .break_ctl = mos7840_break,
2347         .tiocmget = mos7840_tiocmget,
2348         .tiocmset = mos7840_tiocmset,
2349         .tiocmiwait = usb_serial_generic_tiocmiwait,
2350         .get_icount = usb_serial_generic_get_icount,
2351         .port_probe = mos7840_port_probe,
2352         .port_remove = mos7840_port_remove,
2353         .read_bulk_callback = mos7840_bulk_in_callback,
2354         .read_int_callback = mos7840_interrupt_callback,
2355 };
2356
2357 static struct usb_serial_driver * const serial_drivers[] = {
2358         &moschip7840_4port_device, NULL
2359 };
2360
2361 module_usb_serial_driver(serial_drivers, id_table);
2362
2363 MODULE_DESCRIPTION(DRIVER_DESC);
2364 MODULE_LICENSE("GPL");