kernel/drivers/usb/serial/mos7840.c

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