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 *read_urb;   /* read URB for this port */
 218         __u8 shadowLCR;         /* last LCR value received */
 219         __u8 shadowMCR;         /* last MCR value received */
 220         char open;
 221         char open_ports;
 222         struct usb_serial_port *port;   /* loop back to the owner of this object */
 223
 224         /* Offsets */
 225         __u8 SpRegOffset;
 226         __u8 ControlRegOffset;
 227         __u8 DcrRegOffset;
 228         /* for processing control URBS in interrupt context */
 229         struct urb *control_urb;
 230         struct usb_ctrlrequest *dr;
 231         char *ctrl_buf;
 232         int MsrLsr;
 233
 234         spinlock_t pool_lock;
 235         struct urb *write_urb_pool[NUM_URBS];
 236         char busy[NUM_URBS];
 237         bool read_urb_busy;
 238
 239         /* For device(s) with LED indicator */
 240         bool has_led;
 241         struct timer_list led_timer1;   /* Timer for LED on */
 242         struct timer_list led_timer2;   /* Timer for LED off */
 243         struct urb *led_urb;
 244         struct usb_ctrlrequest *led_dr;
 245
 246         unsigned long flags;
 247 };
 248
 249 /*
 250  * mos7840_set_reg_sync
 251  *      To set the Control register by calling usb_fill_control_urb function
 252  *      by passing usb_sndctrlpipe function as parameter.
 253  */
 254
 255 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 256                                 __u16 val)
 257 {
 258         struct usb_device *dev = port->serial->dev;
 259         val = val & 0x00ff;
 260         dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
 261
 262         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 263                                MCS_WR_RTYPE, val, reg, NULL, 0,
 264                                MOS_WDR_TIMEOUT);
 265 }
 266
 267 /*
 268  * mos7840_get_reg_sync
 269  *      To set the Uart register by calling usb_fill_control_urb function by
 270  *      passing usb_rcvctrlpipe function as parameter.
 271  */
 272
 273 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 274                                 __u16 *val)
 275 {
 276         struct usb_device *dev = port->serial->dev;
 277         int ret = 0;
 278         u8 *buf;
 279
 280         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 281         if (!buf)
 282                 return -ENOMEM;
 283
 284         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 285                               MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
 286                               MOS_WDR_TIMEOUT);
 287         if (ret < VENDOR_READ_LENGTH) {
 288                 if (ret >= 0)
 289                         ret = -EIO;
 290                 goto out;
 291         }
 292
 293         *val = buf[0];
 294         dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
 295 out:
 296         kfree(buf);
 297         return ret;
 298 }
 299
 300 /*
 301  * mos7840_set_uart_reg
 302  *      To set the Uart register by calling usb_fill_control_urb function by
 303  *      passing usb_sndctrlpipe function as parameter.
 304  */
 305
 306 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 307                                 __u16 val)
 308 {
 309
 310         struct usb_device *dev = port->serial->dev;
 311         val = val & 0x00ff;
 312         /* For the UART control registers, the application number need
 313            to be Or'ed */
 314         if (port->serial->num_ports == 4) {
 315                 val |= ((__u16)port->port_number + 1) << 8;
 316         } else {
 317                 if (port->port_number == 0) {
 318                         val |= ((__u16)port->port_number + 1) << 8;
 319                 } else {
 320                         val |= ((__u16)port->port_number + 2) << 8;
 321                 }
 322         }
 323         dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
 324         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 325                                MCS_WR_RTYPE, val, reg, NULL, 0,
 326                                MOS_WDR_TIMEOUT);
 327
 328 }
 329
 330 /*
 331  * mos7840_get_uart_reg
 332  *      To set the Control register by calling usb_fill_control_urb function
 333  *      by passing usb_rcvctrlpipe function as parameter.
 334  */
 335 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 336                                 __u16 *val)
 337 {
 338         struct usb_device *dev = port->serial->dev;
 339         int ret = 0;
 340         __u16 Wval;
 341         u8 *buf;
 342
 343         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 344         if (!buf)
 345                 return -ENOMEM;
 346
 347         /* Wval  is same as application number */
 348         if (port->serial->num_ports == 4) {
 349                 Wval = ((__u16)port->port_number + 1) << 8;
 350         } else {
 351                 if (port->port_number == 0) {
 352                         Wval = ((__u16)port->port_number + 1) << 8;
 353                 } else {
 354                         Wval = ((__u16)port->port_number + 2) << 8;
 355                 }
 356         }
 357         dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
 358         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 359                               MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
 360                               MOS_WDR_TIMEOUT);
 361         if (ret < VENDOR_READ_LENGTH) {
 362                 if (ret >= 0)
 363                         ret = -EIO;
 364                 goto out;
 365         }
 366         *val = buf[0];
 367 out:
 368         kfree(buf);
 369         return ret;
 370 }
 371
 372 static void mos7840_dump_serial_port(struct usb_serial_port *port,
 373                                      struct moschip_port *mos7840_port)
 374 {
 375
 376         dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
 377         dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
 378         dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
 379
 380 }
 381
 382 /************************************************************************/
 383 /************************************************************************/
 384 /*             I N T E R F A C E   F U N C T I O N S                    */
 385 /*             I N T E R F A C E   F U N C T I O N S                    */
 386 /************************************************************************/
 387 /************************************************************************/
 388
 389 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 390                                             struct moschip_port *data)
 391 {
 392         usb_set_serial_port_data(port, (void *)data);
 393 }
 394
 395 static inline struct moschip_port *mos7840_get_port_private(struct
 396                                                             usb_serial_port
 397                                                             *port)
 398 {
 399         return (struct moschip_port *)usb_get_serial_port_data(port);
 400 }
 401
 402 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 403 {
 404         struct moschip_port *mos7840_port;
 405         struct async_icount *icount;
 406         mos7840_port = port;
 407         if (new_msr &
 408             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 409              MOS_MSR_DELTA_CD)) {
 410                 icount = &mos7840_port->port->icount;
 411
 412                 /* update input line counters */
 413                 if (new_msr & MOS_MSR_DELTA_CTS)
 414                         icount->cts++;
 415                 if (new_msr & MOS_MSR_DELTA_DSR)
 416                         icount->dsr++;
 417                 if (new_msr & MOS_MSR_DELTA_CD)
 418                         icount->dcd++;
 419                 if (new_msr & MOS_MSR_DELTA_RI)
 420                         icount->rng++;
 421
 422                 wake_up_interruptible(&port->port->port.delta_msr_wait);
 423         }
 424 }
 425
 426 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 427 {
 428         struct async_icount *icount;
 429
 430         if (new_lsr & SERIAL_LSR_BI) {
 431                 /*
 432                  * Parity and Framing errors only count if they
 433                  * occur exclusive of a break being
 434                  * received.
 435                  */
 436                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 437         }
 438
 439         /* update input line counters */
 440         icount = &port->port->icount;
 441         if (new_lsr & SERIAL_LSR_BI)
 442                 icount->brk++;
 443         if (new_lsr & SERIAL_LSR_OE)
 444                 icount->overrun++;
 445         if (new_lsr & SERIAL_LSR_PE)
 446                 icount->parity++;
 447         if (new_lsr & SERIAL_LSR_FE)
 448                 icount->frame++;
 449 }
 450
 451 /************************************************************************/
 452 /************************************************************************/
 453 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 454 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 455 /************************************************************************/
 456 /************************************************************************/
 457
 458 static void mos7840_control_callback(struct urb *urb)
 459 {
 460         unsigned char *data;
 461         struct moschip_port *mos7840_port;
 462         struct device *dev = &urb->dev->dev;
 463         __u8 regval = 0x0;
 464         int status = urb->status;
 465
 466         mos7840_port = urb->context;
 467
 468         switch (status) {
 469         case 0:
 470                 /* success */
 471                 break;
 472         case -ECONNRESET:
 473         case -ENOENT:
 474         case -ESHUTDOWN:
 475                 /* this urb is terminated, clean up */
 476                 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
 477                 goto out;
 478         default:
 479                 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
 480                 goto out;
 481         }
 482
 483         dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length);
 484         dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__,
 485                 mos7840_port->MsrLsr, mos7840_port->port_num);
 486         data = urb->transfer_buffer;
 487         regval = (__u8) data[0];
 488         dev_dbg(dev, "%s data is %x\n", __func__, regval);
 489         if (mos7840_port->MsrLsr == 0)
 490                 mos7840_handle_new_msr(mos7840_port, regval);
 491         else if (mos7840_port->MsrLsr == 1)
 492                 mos7840_handle_new_lsr(mos7840_port, regval);
 493 out:
 494         clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mos7840_port->flags);
 495 }
 496
 497 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 498                            __u16 *val)
 499 {
 500         struct usb_device *dev = mcs->port->serial->dev;
 501         struct usb_ctrlrequest *dr = mcs->dr;
 502         unsigned char *buffer = mcs->ctrl_buf;
 503         int ret;
 504
 505         if (test_and_set_bit_lock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags))
 506                 return -EBUSY;
 507
 508         dr->bRequestType = MCS_RD_RTYPE;
 509         dr->bRequest = MCS_RDREQ;
 510         dr->wValue = cpu_to_le16(Wval); /* 0 */
 511         dr->wIndex = cpu_to_le16(reg);
 512         dr->wLength = cpu_to_le16(2);
 513
 514         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 515                              (unsigned char *)dr, buffer, 2,
 516                              mos7840_control_callback, mcs);
 517         mcs->control_urb->transfer_buffer_length = 2;
 518         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 519         if (ret)
 520                 clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags);
 521
 522         return ret;
 523 }
 524
 525 static void mos7840_set_led_callback(struct urb *urb)
 526 {
 527         switch (urb->status) {
 528         case 0:
 529                 /* Success */
 530                 break;
 531         case -ECONNRESET:
 532         case -ENOENT:
 533         case -ESHUTDOWN:
 534                 /* This urb is terminated, clean up */
 535                 dev_dbg(&urb->dev->dev, "%s - urb shutting down: %d\n",
 536                         __func__, urb->status);
 537                 break;
 538         default:
 539                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n",
 540                         __func__, urb->status);
 541         }
 542 }
 543
 544 static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
 545                                 __u16 reg)
 546 {
 547         struct usb_device *dev = mcs->port->serial->dev;
 548         struct usb_ctrlrequest *dr = mcs->led_dr;
 549
 550         dr->bRequestType = MCS_WR_RTYPE;
 551         dr->bRequest = MCS_WRREQ;
 552         dr->wValue = cpu_to_le16(wval);
 553         dr->wIndex = cpu_to_le16(reg);
 554         dr->wLength = cpu_to_le16(0);
 555
 556         usb_fill_control_urb(mcs->led_urb, dev, usb_sndctrlpipe(dev, 0),
 557                 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
 558
 559         usb_submit_urb(mcs->led_urb, GFP_ATOMIC);
 560 }
 561
 562 static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
 563                                 __u16 val)
 564 {
 565         struct usb_device *dev = port->serial->dev;
 566
 567         usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
 568                         val, reg, NULL, 0, MOS_WDR_TIMEOUT);
 569 }
 570
 571 static void mos7840_led_off(unsigned long arg)
 572 {
 573         struct moschip_port *mcs = (struct moschip_port *) arg;
 574
 575         /* Turn off LED */
 576         mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
 577         mod_timer(&mcs->led_timer2,
 578                                 jiffies + msecs_to_jiffies(LED_OFF_MS));
 579 }
 580
 581 static void mos7840_led_flag_off(unsigned long arg)
 582 {
 583         struct moschip_port *mcs = (struct moschip_port *) arg;
 584
 585         clear_bit_unlock(MOS7840_FLAG_LED_BUSY, &mcs->flags);
 586 }
 587
 588 static void mos7840_led_activity(struct usb_serial_port *port)
 589 {
 590         struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
 591
 592         if (test_and_set_bit_lock(MOS7840_FLAG_LED_BUSY, &mos7840_port->flags))
 593                 return;
 594
 595         mos7840_set_led_async(mos7840_port, 0x0301, MODEM_CONTROL_REGISTER);
 596         mod_timer(&mos7840_port->led_timer1,
 597                                 jiffies + msecs_to_jiffies(LED_ON_MS));
 598 }
 599
 600 /*****************************************************************************
 601  * mos7840_interrupt_callback
 602  *      this is the callback function for when we have received data on the
 603  *      interrupt endpoint.
 604  *****************************************************************************/
 605
 606 static void mos7840_interrupt_callback(struct urb *urb)
 607 {
 608         int result;
 609         int length;
 610         struct moschip_port *mos7840_port;
 611         struct usb_serial *serial;
 612         __u16 Data;
 613         unsigned char *data;
 614         __u8 sp[5], st;
 615         int i, rv = 0;
 616         __u16 wval, wreg = 0;
 617         int status = urb->status;
 618
 619         switch (status) {
 620         case 0:
 621                 /* success */
 622                 break;
 623         case -ECONNRESET:
 624         case -ENOENT:
 625         case -ESHUTDOWN:
 626                 /* this urb is terminated, clean up */
 627                 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
 628                         __func__, status);
 629                 return;
 630         default:
 631                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
 632                         __func__, status);
 633                 goto exit;
 634         }
 635
 636         length = urb->actual_length;
 637         data = urb->transfer_buffer;
 638
 639         serial = urb->context;
 640
 641         /* Moschip get 5 bytes
 642          * Byte 1 IIR Port 1 (port.number is 0)
 643          * Byte 2 IIR Port 2 (port.number is 1)
 644          * Byte 3 IIR Port 3 (port.number is 2)
 645          * Byte 4 IIR Port 4 (port.number is 3)
 646          * Byte 5 FIFO status for both */
 647
 648         if (length > 5) {
 649                 dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n");
 650                 return;
 651         }
 652
 653         sp[0] = (__u8) data[0];
 654         sp[1] = (__u8) data[1];
 655         sp[2] = (__u8) data[2];
 656         sp[3] = (__u8) data[3];
 657         st = (__u8) data[4];
 658
 659         for (i = 0; i < serial->num_ports; i++) {
 660                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 661                 wval = ((__u16)serial->port[i]->port_number + 1) << 8;
 662                 if (mos7840_port->open) {
 663                         if (sp[i] & 0x01) {
 664                                 dev_dbg(&urb->dev->dev, "SP%d No Interrupt !!!\n", i);
 665                         } else {
 666                                 switch (sp[i] & 0x0f) {
 667                                 case SERIAL_IIR_RLS:
 668                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Receiver status error or \n", i);
 669                                         dev_dbg(&urb->dev->dev, "address bit detected in 9-bit mode\n");
 670                                         mos7840_port->MsrLsr = 1;
 671                                         wreg = LINE_STATUS_REGISTER;
 672                                         break;
 673                                 case SERIAL_IIR_MS:
 674                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Modem status change\n", i);
 675                                         mos7840_port->MsrLsr = 0;
 676                                         wreg = MODEM_STATUS_REGISTER;
 677                                         break;
 678                                 }
 679                                 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 680                         }
 681                 }
 682         }
 683         if (!(rv < 0))
 684                 /* the completion handler for the control urb will resubmit */
 685                 return;
 686 exit:
 687         result = usb_submit_urb(urb, GFP_ATOMIC);
 688         if (result) {
 689                 dev_err(&urb->dev->dev,
 690                         "%s - Error %d submitting interrupt urb\n",
 691                         __func__, result);
 692         }
 693 }
 694
 695 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 696                                        const char *function)
 697 {
 698         if (!port) {
 699                 pr_debug("%s - port == NULL\n", function);
 700                 return -1;
 701         }
 702         if (!port->serial) {
 703                 pr_debug("%s - port->serial == NULL\n", function);
 704                 return -1;
 705         }
 706
 707         return 0;
 708 }
 709
 710 /* Inline functions to check the sanity of a pointer that is passed to us */
 711 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 712                                          const char *function)
 713 {
 714         if (!serial) {
 715                 pr_debug("%s - serial == NULL\n", function);
 716                 return -1;
 717         }
 718         if (!serial->type) {
 719                 pr_debug("%s - serial->type == NULL!\n", function);
 720                 return -1;
 721         }
 722
 723         return 0;
 724 }
 725
 726 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 727                                                  const char *function)
 728 {
 729         /* if no port was specified, or it fails a paranoia check */
 730         if (!port ||
 731             mos7840_port_paranoia_check(port, function) ||
 732             mos7840_serial_paranoia_check(port->serial, function)) {
 733                 /* then say that we don't have a valid usb_serial thing,
 734                  * which will end up genrating -ENODEV return values */
 735                 return NULL;
 736         }
 737
 738         return port->serial;
 739 }
 740
 741 /*****************************************************************************
 742  * mos7840_bulk_in_callback
 743  *      this is the callback function for when we have received data on the
 744  *      bulk in endpoint.
 745  *****************************************************************************/
 746
 747 static void mos7840_bulk_in_callback(struct urb *urb)
 748 {
 749         int retval;
 750         unsigned char *data;
 751         struct usb_serial *serial;
 752         struct usb_serial_port *port;
 753         struct moschip_port *mos7840_port;
 754         int status = urb->status;
 755
 756         mos7840_port = urb->context;
 757         if (!mos7840_port)
 758                 return;
 759
 760         if (status) {
 761                 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
 762                 mos7840_port->read_urb_busy = false;
 763                 return;
 764         }
 765
 766         port = mos7840_port->port;
 767         if (mos7840_port_paranoia_check(port, __func__)) {
 768                 mos7840_port->read_urb_busy = false;
 769                 return;
 770         }
 771
 772         serial = mos7840_get_usb_serial(port, __func__);
 773         if (!serial) {
 774                 mos7840_port->read_urb_busy = false;
 775                 return;
 776         }
 777
 778         data = urb->transfer_buffer;
 779         usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
 780
 781         if (urb->actual_length) {
 782                 struct tty_port *tport = &mos7840_port->port->port;
 783                 tty_insert_flip_string(tport, data, urb->actual_length);
 784                 tty_flip_buffer_push(tport);
 785                 port->icount.rx += urb->actual_length;
 786                 dev_dbg(&port->dev, "icount.rx is %d:\n", port->icount.rx);
 787         }
 788
 789         if (!mos7840_port->read_urb) {
 790                 dev_dbg(&port->dev, "%s", "URB KILLED !!!\n");
 791                 mos7840_port->read_urb_busy = false;
 792                 return;
 793         }
 794
 795         if (mos7840_port->has_led)
 796                 mos7840_led_activity(port);
 797
 798         mos7840_port->read_urb_busy = true;
 799         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 800
 801         if (retval) {
 802                 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
 803                 mos7840_port->read_urb_busy = false;
 804         }
 805 }
 806
 807 /*****************************************************************************
 808  * mos7840_bulk_out_data_callback
 809  *      this is the callback function for when we have finished sending
 810  *      serial data on the bulk out endpoint.
 811  *****************************************************************************/
 812
 813 static void mos7840_bulk_out_data_callback(struct urb *urb)
 814 {
 815         struct moschip_port *mos7840_port;
 816         struct usb_serial_port *port;
 817         int status = urb->status;
 818         int i;
 819
 820         mos7840_port = urb->context;
 821         port = mos7840_port->port;
 822         spin_lock(&mos7840_port->pool_lock);
 823         for (i = 0; i < NUM_URBS; i++) {
 824                 if (urb == mos7840_port->write_urb_pool[i]) {
 825                         mos7840_port->busy[i] = 0;
 826                         break;
 827                 }
 828         }
 829         spin_unlock(&mos7840_port->pool_lock);
 830
 831         if (status) {
 832                 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
 833                 return;
 834         }
 835
 836         if (mos7840_port_paranoia_check(port, __func__))
 837                 return;
 838
 839         if (mos7840_port->open)
 840                 tty_port_tty_wakeup(&port->port);
 841
 842 }
 843
 844 /************************************************************************/
 845 /*       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       */
 846 /************************************************************************/
 847
 848 /*****************************************************************************
 849  * mos7840_open
 850  *      this function is called by the tty driver when a port is opened
 851  *      If successful, we return 0
 852  *      Otherwise we return a negative error number.
 853  *****************************************************************************/
 854
 855 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
 856 {
 857         int response;
 858         int j;
 859         struct usb_serial *serial;
 860         struct urb *urb;
 861         __u16 Data;
 862         int status;
 863         struct moschip_port *mos7840_port;
 864         struct moschip_port *port0;
 865
 866         if (mos7840_port_paranoia_check(port, __func__))
 867                 return -ENODEV;
 868
 869         serial = port->serial;
 870
 871         if (mos7840_serial_paranoia_check(serial, __func__))
 872                 return -ENODEV;
 873
 874         mos7840_port = mos7840_get_port_private(port);
 875         port0 = mos7840_get_port_private(serial->port[0]);
 876
 877         if (mos7840_port == NULL || port0 == NULL)
 878                 return -ENODEV;
 879
 880         usb_clear_halt(serial->dev, port->write_urb->pipe);
 881         usb_clear_halt(serial->dev, port->read_urb->pipe);
 882         port0->open_ports++;
 883
 884         /* Initialising the write urb pool */
 885         for (j = 0; j < NUM_URBS; ++j) {
 886                 urb = usb_alloc_urb(0, GFP_KERNEL);
 887                 mos7840_port->write_urb_pool[j] = urb;
 888                 if (!urb)
 889                         continue;
 890
 891                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 892                                                                 GFP_KERNEL);
 893                 if (!urb->transfer_buffer) {
 894                         usb_free_urb(urb);
 895                         mos7840_port->write_urb_pool[j] = NULL;
 896                         continue;
 897                 }
 898         }
 899
 900 /*****************************************************************************
 901  * Initialize MCS7840 -- Write Init values to corresponding Registers
 902  *
 903  * Register Index
 904  * 1 : IER
 905  * 2 : FCR
 906  * 3 : LCR
 907  * 4 : MCR
 908  *
 909  * 0x08 : SP1/2 Control Reg
 910  *****************************************************************************/
 911
 912         /* NEED to check the following Block */
 913
 914         Data = 0x0;
 915         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 916         if (status < 0) {
 917                 dev_dbg(&port->dev, "Reading Spreg failed\n");
 918                 goto err;
 919         }
 920         Data |= 0x80;
 921         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 922         if (status < 0) {
 923                 dev_dbg(&port->dev, "writing Spreg failed\n");
 924                 goto err;
 925         }
 926
 927         Data &= ~0x80;
 928         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 929         if (status < 0) {
 930                 dev_dbg(&port->dev, "writing Spreg failed\n");
 931                 goto err;
 932         }
 933         /* End of block to be checked */
 934
 935         Data = 0x0;
 936         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 937                                                                         &Data);
 938         if (status < 0) {
 939                 dev_dbg(&port->dev, "Reading Controlreg failed\n");
 940                 goto err;
 941         }
 942         Data |= 0x08;           /* Driver done bit */
 943         Data |= 0x20;           /* rx_disable */
 944         status = mos7840_set_reg_sync(port,
 945                                 mos7840_port->ControlRegOffset, Data);
 946         if (status < 0) {
 947                 dev_dbg(&port->dev, "writing Controlreg failed\n");
 948                 goto err;
 949         }
 950         /* do register settings here */
 951         /* Set all regs to the device default values. */
 952         /***********************************
 953          * First Disable all interrupts.
 954          ***********************************/
 955         Data = 0x00;
 956         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 957         if (status < 0) {
 958                 dev_dbg(&port->dev, "disabling interrupts failed\n");
 959                 goto err;
 960         }
 961         /* Set FIFO_CONTROL_REGISTER to the default value */
 962         Data = 0x00;
 963         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 964         if (status < 0) {
 965                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
 966                 goto err;
 967         }
 968
 969         Data = 0xcf;
 970         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 971         if (status < 0) {
 972                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
 973                 goto err;
 974         }
 975
 976         Data = 0x03;
 977         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 978         mos7840_port->shadowLCR = Data;
 979
 980         Data = 0x0b;
 981         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
 982         mos7840_port->shadowMCR = Data;
 983
 984         Data = 0x00;
 985         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 986         mos7840_port->shadowLCR = Data;
 987
 988         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
 989         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 990
 991         Data = 0x0c;
 992         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
 993
 994         Data = 0x0;
 995         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
 996
 997         Data = 0x00;
 998         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 999
1000         Data = Data & ~SERIAL_LCR_DLAB;
1001         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1002         mos7840_port->shadowLCR = Data;
1003
1004         /* clearing Bulkin and Bulkout Fifo */
1005         Data = 0x0;
1006         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1007
1008         Data = Data | 0x0c;
1009         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1010
1011         Data = Data & ~0x0c;
1012         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1013         /* Finally enable all interrupts */
1014         Data = 0x0c;
1015         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1016
1017         /* clearing rx_disable */
1018         Data = 0x0;
1019         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1020                                                                         &Data);
1021         Data = Data & ~0x20;
1022         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1023                                                                         Data);
1024
1025         /* rx_negate */
1026         Data = 0x0;
1027         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1028                                                                         &Data);
1029         Data = Data | 0x10;
1030         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1031                                                                         Data);
1032
1033         /* Check to see if we've set up our endpoint info yet    *
1034          * (can't set it up in mos7840_startup as the structures *
1035          * were not set up at that time.)                        */
1036         if (port0->open_ports == 1) {
1037                 /* FIXME: Buffer never NULL, so URB is not submitted. */
1038                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1039                         /* set up interrupt urb */
1040                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1041                                 serial->dev,
1042                                 usb_rcvintpipe(serial->dev,
1043                                 serial->port[0]->interrupt_in_endpointAddress),
1044                                 serial->port[0]->interrupt_in_buffer,
1045                                 serial->port[0]->interrupt_in_urb->
1046                                 transfer_buffer_length,
1047                                 mos7840_interrupt_callback,
1048                                 serial,
1049                                 serial->port[0]->interrupt_in_urb->interval);
1050
1051                         /* start interrupt read for mos7840 */
1052                         response =
1053                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1054                                            GFP_KERNEL);
1055                         if (response) {
1056                                 dev_err(&port->dev, "%s - Error %d submitting "
1057                                         "interrupt urb\n", __func__, response);
1058                         }
1059
1060                 }
1061
1062         }
1063
1064         /* see if we've set up our endpoint info yet   *
1065          * (can't set it up in mos7840_startup as the  *
1066          * structures were not set up at that time.)   */
1067
1068         dev_dbg(&port->dev, "port number is %d\n", port->port_number);
1069         dev_dbg(&port->dev, "minor number is %d\n", port->minor);
1070         dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
1071         dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
1072         dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
1073         dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
1074         mos7840_port->read_urb = port->read_urb;
1075
1076         /* set up our bulk in urb */
1077         if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1078                 usb_fill_bulk_urb(mos7840_port->read_urb,
1079                         serial->dev,
1080                         usb_rcvbulkpipe(serial->dev,
1081                                 (port->bulk_in_endpointAddress) + 2),
1082                         port->bulk_in_buffer,
1083                         mos7840_port->read_urb->transfer_buffer_length,
1084                         mos7840_bulk_in_callback, mos7840_port);
1085         } else {
1086                 usb_fill_bulk_urb(mos7840_port->read_urb,
1087                         serial->dev,
1088                         usb_rcvbulkpipe(serial->dev,
1089                                 port->bulk_in_endpointAddress),
1090                         port->bulk_in_buffer,
1091                         mos7840_port->read_urb->transfer_buffer_length,
1092                         mos7840_bulk_in_callback, mos7840_port);
1093         }
1094
1095         dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
1096         mos7840_port->read_urb_busy = true;
1097         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1098         if (response) {
1099                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1100                         __func__, response);
1101                 mos7840_port->read_urb_busy = false;
1102         }
1103
1104         /* initialize our port settings */
1105         /* Must set to enable ints! */
1106         mos7840_port->shadowMCR = MCR_MASTER_IE;
1107         /* send a open port command */
1108         mos7840_port->open = 1;
1109         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1110
1111         return 0;
1112 err:
1113         for (j = 0; j < NUM_URBS; ++j) {
1114                 urb = mos7840_port->write_urb_pool[j];
1115                 if (!urb)
1116                         continue;
1117                 kfree(urb->transfer_buffer);
1118                 usb_free_urb(urb);
1119         }
1120         return status;
1121 }
1122
1123 /*****************************************************************************
1124  * mos7840_chars_in_buffer
1125  *      this function is called by the tty driver when it wants to know how many
1126  *      bytes of data we currently have outstanding in the port (data that has
1127  *      been written, but hasn't made it out the port yet)
1128  *      If successful, we return the number of bytes left to be written in the
1129  *      system,
1130  *      Otherwise we return zero.
1131  *****************************************************************************/
1132
1133 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1134 {
1135         struct usb_serial_port *port = tty->driver_data;
1136         int i;
1137         int chars = 0;
1138         unsigned long flags;
1139         struct moschip_port *mos7840_port;
1140
1141         if (mos7840_port_paranoia_check(port, __func__))
1142                 return 0;
1143
1144         mos7840_port = mos7840_get_port_private(port);
1145         if (mos7840_port == NULL)
1146                 return 0;
1147
1148         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1149         for (i = 0; i < NUM_URBS; ++i) {
1150                 if (mos7840_port->busy[i]) {
1151                         struct urb *urb = mos7840_port->write_urb_pool[i];
1152                         chars += urb->transfer_buffer_length;
1153                 }
1154         }
1155         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1156         dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1157         return chars;
1158
1159 }
1160
1161 /*****************************************************************************
1162  * mos7840_close
1163  *      this function is called by the tty driver when a port is closed
1164  *****************************************************************************/
1165
1166 static void mos7840_close(struct usb_serial_port *port)
1167 {
1168         struct usb_serial *serial;
1169         struct moschip_port *mos7840_port;
1170         struct moschip_port *port0;
1171         int j;
1172         __u16 Data;
1173
1174         if (mos7840_port_paranoia_check(port, __func__))
1175                 return;
1176
1177         serial = mos7840_get_usb_serial(port, __func__);
1178         if (!serial)
1179                 return;
1180
1181         mos7840_port = mos7840_get_port_private(port);
1182         port0 = mos7840_get_port_private(serial->port[0]);
1183
1184         if (mos7840_port == NULL || port0 == NULL)
1185                 return;
1186
1187         for (j = 0; j < NUM_URBS; ++j)
1188                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1189
1190         /* Freeing Write URBs */
1191         for (j = 0; j < NUM_URBS; ++j) {
1192                 if (mos7840_port->write_urb_pool[j]) {
1193                         kfree(mos7840_port->write_urb_pool[j]->transfer_buffer);
1194                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1195                 }
1196         }
1197
1198         usb_kill_urb(mos7840_port->read_urb);
1199         mos7840_port->read_urb_busy = false;
1200
1201         port0->open_ports--;
1202         dev_dbg(&port->dev, "%s in close%d\n", __func__, port0->open_ports);
1203         if (port0->open_ports == 0) {
1204                 if (serial->port[0]->interrupt_in_urb) {
1205                         dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n");
1206                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1207                 }
1208         }
1209
1210         Data = 0x0;
1211         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1212
1213         Data = 0x00;
1214         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1215
1216         mos7840_port->open = 0;
1217 }
1218
1219 /*****************************************************************************
1220  * mos7840_break
1221  *      this function sends a break to the port
1222  *****************************************************************************/
1223 static void mos7840_break(struct tty_struct *tty, int break_state)
1224 {
1225         struct usb_serial_port *port = tty->driver_data;
1226         unsigned char data;
1227         struct usb_serial *serial;
1228         struct moschip_port *mos7840_port;
1229
1230         if (mos7840_port_paranoia_check(port, __func__))
1231                 return;
1232
1233         serial = mos7840_get_usb_serial(port, __func__);
1234         if (!serial)
1235                 return;
1236
1237         mos7840_port = mos7840_get_port_private(port);
1238
1239         if (mos7840_port == NULL)
1240                 return;
1241
1242         if (break_state == -1)
1243                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1244         else
1245                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1246
1247         /* FIXME: no locking on shadowLCR anywhere in driver */
1248         mos7840_port->shadowLCR = data;
1249         dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1250         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1251                              mos7840_port->shadowLCR);
1252 }
1253
1254 /*****************************************************************************
1255  * mos7840_write_room
1256  *      this function is called by the tty driver when it wants to know how many
1257  *      bytes of data we can accept for a specific port.
1258  *      If successful, we return the amount of room that we have for this port
1259  *      Otherwise we return a negative error number.
1260  *****************************************************************************/
1261
1262 static int mos7840_write_room(struct tty_struct *tty)
1263 {
1264         struct usb_serial_port *port = tty->driver_data;
1265         int i;
1266         int room = 0;
1267         unsigned long flags;
1268         struct moschip_port *mos7840_port;
1269
1270         if (mos7840_port_paranoia_check(port, __func__))
1271                 return -1;
1272
1273         mos7840_port = mos7840_get_port_private(port);
1274         if (mos7840_port == NULL)
1275                 return -1;
1276
1277         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1278         for (i = 0; i < NUM_URBS; ++i) {
1279                 if (!mos7840_port->busy[i])
1280                         room += URB_TRANSFER_BUFFER_SIZE;
1281         }
1282         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1283
1284         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1285         dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room);
1286         return room;
1287
1288 }
1289
1290 /*****************************************************************************
1291  * mos7840_write
1292  *      this function is called by the tty driver when data should be written to
1293  *      the port.
1294  *      If successful, we return the number of bytes written, otherwise we
1295  *      return a negative error number.
1296  *****************************************************************************/
1297
1298 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1299                          const unsigned char *data, int count)
1300 {
1301         int status;
1302         int i;
1303         int bytes_sent = 0;
1304         int transfer_size;
1305         unsigned long flags;
1306
1307         struct moschip_port *mos7840_port;
1308         struct usb_serial *serial;
1309         struct urb *urb;
1310         /* __u16 Data; */
1311         const unsigned char *current_position = data;
1312         unsigned char *data1;
1313
1314         if (mos7840_port_paranoia_check(port, __func__))
1315                 return -1;
1316
1317         serial = port->serial;
1318         if (mos7840_serial_paranoia_check(serial, __func__))
1319                 return -1;
1320
1321         mos7840_port = mos7840_get_port_private(port);
1322         if (mos7840_port == NULL)
1323                 return -1;
1324
1325         /* try to find a free urb in the list */
1326         urb = NULL;
1327
1328         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1329         for (i = 0; i < NUM_URBS; ++i) {
1330                 if (!mos7840_port->busy[i]) {
1331                         mos7840_port->busy[i] = 1;
1332                         urb = mos7840_port->write_urb_pool[i];
1333                         dev_dbg(&port->dev, "URB:%d\n", i);
1334                         break;
1335                 }
1336         }
1337         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1338
1339         if (urb == NULL) {
1340                 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1341                 goto exit;
1342         }
1343
1344         if (urb->transfer_buffer == NULL) {
1345                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1346                                                GFP_ATOMIC);
1347                 if (!urb->transfer_buffer)
1348                         goto exit;
1349         }
1350         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1351
1352         memcpy(urb->transfer_buffer, current_position, transfer_size);
1353
1354         /* fill urb with data and submit  */
1355         if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1356                 usb_fill_bulk_urb(urb,
1357                         serial->dev,
1358                         usb_sndbulkpipe(serial->dev,
1359                                 (port->bulk_out_endpointAddress) + 2),
1360                         urb->transfer_buffer,
1361                         transfer_size,
1362                         mos7840_bulk_out_data_callback, mos7840_port);
1363         } else {
1364                 usb_fill_bulk_urb(urb,
1365                         serial->dev,
1366                         usb_sndbulkpipe(serial->dev,
1367                                 port->bulk_out_endpointAddress),
1368                         urb->transfer_buffer,
1369                         transfer_size,
1370                         mos7840_bulk_out_data_callback, mos7840_port);
1371         }
1372
1373         data1 = urb->transfer_buffer;
1374         dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
1375
1376         if (mos7840_port->has_led)
1377                 mos7840_led_activity(port);
1378
1379         /* send it down the pipe */
1380         status = usb_submit_urb(urb, GFP_ATOMIC);
1381
1382         if (status) {
1383                 mos7840_port->busy[i] = 0;
1384                 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1385                         "with status = %d\n", __func__, status);
1386                 bytes_sent = status;
1387                 goto exit;
1388         }
1389         bytes_sent = transfer_size;
1390         port->icount.tx += transfer_size;
1391         dev_dbg(&port->dev, "icount.tx is %d:\n", port->icount.tx);
1392 exit:
1393         return bytes_sent;
1394
1395 }
1396
1397 /*****************************************************************************
1398  * mos7840_throttle
1399  *      this function is called by the tty driver when it wants to stop the data
1400  *      being read from the port.
1401  *****************************************************************************/
1402
1403 static void mos7840_throttle(struct tty_struct *tty)
1404 {
1405         struct usb_serial_port *port = tty->driver_data;
1406         struct moschip_port *mos7840_port;
1407         int status;
1408
1409         if (mos7840_port_paranoia_check(port, __func__))
1410                 return;
1411
1412         mos7840_port = mos7840_get_port_private(port);
1413
1414         if (mos7840_port == NULL)
1415                 return;
1416
1417         if (!mos7840_port->open) {
1418                 dev_dbg(&port->dev, "%s", "port not opened\n");
1419                 return;
1420         }
1421
1422         /* if we are implementing XON/XOFF, send the stop character */
1423         if (I_IXOFF(tty)) {
1424                 unsigned char stop_char = STOP_CHAR(tty);
1425                 status = mos7840_write(tty, port, &stop_char, 1);
1426                 if (status <= 0)
1427                         return;
1428         }
1429         /* if we are implementing RTS/CTS, toggle that line */
1430         if (C_CRTSCTS(tty)) {
1431                 mos7840_port->shadowMCR &= ~MCR_RTS;
1432                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1433                                          mos7840_port->shadowMCR);
1434                 if (status < 0)
1435                         return;
1436         }
1437 }
1438
1439 /*****************************************************************************
1440  * mos7840_unthrottle
1441  *      this function is called by the tty driver when it wants to resume
1442  *      the data being read from the port (called after mos7840_throttle is
1443  *      called)
1444  *****************************************************************************/
1445 static void mos7840_unthrottle(struct tty_struct *tty)
1446 {
1447         struct usb_serial_port *port = tty->driver_data;
1448         int status;
1449         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1450
1451         if (mos7840_port_paranoia_check(port, __func__))
1452                 return;
1453
1454         if (mos7840_port == NULL)
1455                 return;
1456
1457         if (!mos7840_port->open) {
1458                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1459                 return;
1460         }
1461
1462         /* if we are implementing XON/XOFF, send the start character */
1463         if (I_IXOFF(tty)) {
1464                 unsigned char start_char = START_CHAR(tty);
1465                 status = mos7840_write(tty, port, &start_char, 1);
1466                 if (status <= 0)
1467                         return;
1468         }
1469
1470         /* if we are implementing RTS/CTS, toggle that line */
1471         if (C_CRTSCTS(tty)) {
1472                 mos7840_port->shadowMCR |= MCR_RTS;
1473                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1474                                          mos7840_port->shadowMCR);
1475                 if (status < 0)
1476                         return;
1477         }
1478 }
1479
1480 static int mos7840_tiocmget(struct tty_struct *tty)
1481 {
1482         struct usb_serial_port *port = tty->driver_data;
1483         struct moschip_port *mos7840_port;
1484         unsigned int result;
1485         __u16 msr;
1486         __u16 mcr;
1487         int status;
1488         mos7840_port = mos7840_get_port_private(port);
1489
1490         if (mos7840_port == NULL)
1491                 return -ENODEV;
1492
1493         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1494         if (status < 0)
1495                 return -EIO;
1496         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1497         if (status < 0)
1498                 return -EIO;
1499         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1500             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1501             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1502             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1503             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1504             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1505             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1506
1507         dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1508
1509         return result;
1510 }
1511
1512 static int mos7840_tiocmset(struct tty_struct *tty,
1513                             unsigned int set, unsigned int clear)
1514 {
1515         struct usb_serial_port *port = tty->driver_data;
1516         struct moschip_port *mos7840_port;
1517         unsigned int mcr;
1518         int status;
1519
1520         mos7840_port = mos7840_get_port_private(port);
1521
1522         if (mos7840_port == NULL)
1523                 return -ENODEV;
1524
1525         /* FIXME: What locks the port registers ? */
1526         mcr = mos7840_port->shadowMCR;
1527         if (clear & TIOCM_RTS)
1528                 mcr &= ~MCR_RTS;
1529         if (clear & TIOCM_DTR)
1530                 mcr &= ~MCR_DTR;
1531         if (clear & TIOCM_LOOP)
1532                 mcr &= ~MCR_LOOPBACK;
1533
1534         if (set & TIOCM_RTS)
1535                 mcr |= MCR_RTS;
1536         if (set & TIOCM_DTR)
1537                 mcr |= MCR_DTR;
1538         if (set & TIOCM_LOOP)
1539                 mcr |= MCR_LOOPBACK;
1540
1541         mos7840_port->shadowMCR = mcr;
1542
1543         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1544         if (status < 0) {
1545                 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1546                 return status;
1547         }
1548
1549         return 0;
1550 }
1551
1552 /*****************************************************************************
1553  * mos7840_calc_baud_rate_divisor
1554  *      this function calculates the proper baud rate divisor for the specified
1555  *      baud rate.
1556  *****************************************************************************/
1557 static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1558                                           int baudRate, int *divisor,
1559                                           __u16 *clk_sel_val)
1560 {
1561         dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1562
1563         if (baudRate <= 115200) {
1564                 *divisor = 115200 / baudRate;
1565                 *clk_sel_val = 0x0;
1566         }
1567         if ((baudRate > 115200) && (baudRate <= 230400)) {
1568                 *divisor = 230400 / baudRate;
1569                 *clk_sel_val = 0x10;
1570         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1571                 *divisor = 403200 / baudRate;
1572                 *clk_sel_val = 0x20;
1573         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1574                 *divisor = 460800 / baudRate;
1575                 *clk_sel_val = 0x30;
1576         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1577                 *divisor = 806400 / baudRate;
1578                 *clk_sel_val = 0x40;
1579         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1580                 *divisor = 921600 / baudRate;
1581                 *clk_sel_val = 0x50;
1582         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1583                 *divisor = 1572864 / baudRate;
1584                 *clk_sel_val = 0x60;
1585         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1586                 *divisor = 3145728 / baudRate;
1587                 *clk_sel_val = 0x70;
1588         }
1589         return 0;
1590 }
1591
1592 /*****************************************************************************
1593  * mos7840_send_cmd_write_baud_rate
1594  *      this function sends the proper command to change the baud rate of the
1595  *      specified port.
1596  *****************************************************************************/
1597
1598 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1599                                             int baudRate)
1600 {
1601         int divisor = 0;
1602         int status;
1603         __u16 Data;
1604         unsigned char number;
1605         __u16 clk_sel_val;
1606         struct usb_serial_port *port;
1607
1608         if (mos7840_port == NULL)
1609                 return -1;
1610
1611         port = mos7840_port->port;
1612         if (mos7840_port_paranoia_check(port, __func__))
1613                 return -1;
1614
1615         if (mos7840_serial_paranoia_check(port->serial, __func__))
1616                 return -1;
1617
1618         number = mos7840_port->port->port_number;
1619
1620         dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudRate);
1621         /* reset clk_uart_sel in spregOffset */
1622         if (baudRate > 115200) {
1623 #ifdef HW_flow_control
1624                 /* NOTE: need to see the pther register to modify */
1625                 /* setting h/w flow control bit to 1 */
1626                 Data = 0x2b;
1627                 mos7840_port->shadowMCR = Data;
1628                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1629                                                                         Data);
1630                 if (status < 0) {
1631                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1632                         return -1;
1633                 }
1634 #endif
1635
1636         } else {
1637 #ifdef HW_flow_control
1638                 /* setting h/w flow control bit to 0 */
1639                 Data = 0xb;
1640                 mos7840_port->shadowMCR = Data;
1641                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1642                                                                         Data);
1643                 if (status < 0) {
1644                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1645                         return -1;
1646                 }
1647 #endif
1648
1649         }
1650
1651         if (1) {                /* baudRate <= 115200) */
1652                 clk_sel_val = 0x0;
1653                 Data = 0x0;
1654                 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1655                                                    &clk_sel_val);
1656                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1657                                                                  &Data);
1658                 if (status < 0) {
1659                         dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1660                         return -1;
1661                 }
1662                 Data = (Data & 0x8f) | clk_sel_val;
1663                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1664                                                                 Data);
1665                 if (status < 0) {
1666                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1667                         return -1;
1668                 }
1669                 /* Calculate the Divisor */
1670
1671                 if (status) {
1672                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1673                         return status;
1674                 }
1675                 /* Enable access to divisor latch */
1676                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1677                 mos7840_port->shadowLCR = Data;
1678                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1679
1680                 /* Write the divisor */
1681                 Data = (unsigned char)(divisor & 0xff);
1682                 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1683                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1684
1685                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1686                 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1687                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1688
1689                 /* Disable access to divisor latch */
1690                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1691                 mos7840_port->shadowLCR = Data;
1692                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1693
1694         }
1695         return status;
1696 }
1697
1698 /*****************************************************************************
1699  * mos7840_change_port_settings
1700  *      This routine is called to set the UART on the device to match
1701  *      the specified new settings.
1702  *****************************************************************************/
1703
1704 static void mos7840_change_port_settings(struct tty_struct *tty,
1705         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1706 {
1707         int baud;
1708         unsigned cflag;
1709         unsigned iflag;
1710         __u8 lData;
1711         __u8 lParity;
1712         __u8 lStop;
1713         int status;
1714         __u16 Data;
1715         struct usb_serial_port *port;
1716         struct usb_serial *serial;
1717
1718         if (mos7840_port == NULL)
1719                 return;
1720
1721         port = mos7840_port->port;
1722
1723         if (mos7840_port_paranoia_check(port, __func__))
1724                 return;
1725
1726         if (mos7840_serial_paranoia_check(port->serial, __func__))
1727                 return;
1728
1729         serial = port->serial;
1730
1731         if (!mos7840_port->open) {
1732                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1733                 return;
1734         }
1735
1736         lData = LCR_BITS_8;
1737         lStop = LCR_STOP_1;
1738         lParity = LCR_PAR_NONE;
1739
1740         cflag = tty->termios.c_cflag;
1741         iflag = tty->termios.c_iflag;
1742
1743         /* Change the number of bits */
1744         switch (cflag & CSIZE) {
1745         case CS5:
1746                 lData = LCR_BITS_5;
1747                 break;
1748
1749         case CS6:
1750                 lData = LCR_BITS_6;
1751                 break;
1752
1753         case CS7:
1754                 lData = LCR_BITS_7;
1755                 break;
1756
1757         default:
1758         case CS8:
1759                 lData = LCR_BITS_8;
1760                 break;
1761         }
1762
1763         /* Change the Parity bit */
1764         if (cflag & PARENB) {
1765                 if (cflag & PARODD) {
1766                         lParity = LCR_PAR_ODD;
1767                         dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1768                 } else {
1769                         lParity = LCR_PAR_EVEN;
1770                         dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1771                 }
1772
1773         } else {
1774                 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1775         }
1776
1777         if (cflag & CMSPAR)
1778                 lParity = lParity | 0x20;
1779
1780         /* Change the Stop bit */
1781         if (cflag & CSTOPB) {
1782                 lStop = LCR_STOP_2;
1783                 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1784         } else {
1785                 lStop = LCR_STOP_1;
1786                 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1787         }
1788
1789         /* Update the LCR with the correct value */
1790         mos7840_port->shadowLCR &=
1791             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1792         mos7840_port->shadowLCR |= (lData | lParity | lStop);
1793
1794         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1795                 mos7840_port->shadowLCR);
1796         /* Disable Interrupts */
1797         Data = 0x00;
1798         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1799
1800         Data = 0x00;
1801         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1802
1803         Data = 0xcf;
1804         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1805
1806         /* Send the updated LCR value to the mos7840 */
1807         Data = mos7840_port->shadowLCR;
1808
1809         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1810
1811         Data = 0x00b;
1812         mos7840_port->shadowMCR = Data;
1813         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1814         Data = 0x00b;
1815         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1816
1817         /* set up the MCR register and send it to the mos7840 */
1818
1819         mos7840_port->shadowMCR = MCR_MASTER_IE;
1820         if (cflag & CBAUD)
1821                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1822
1823         if (cflag & CRTSCTS)
1824                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1825         else
1826                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1827
1828         Data = mos7840_port->shadowMCR;
1829         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1830
1831         /* Determine divisor based on baud rate */
1832         baud = tty_get_baud_rate(tty);
1833
1834         if (!baud) {
1835                 /* pick a default, any default... */
1836                 dev_dbg(&port->dev, "%s", "Picked default baud...\n");
1837                 baud = 9600;
1838         }
1839
1840         dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1841         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
1842
1843         /* Enable Interrupts */
1844         Data = 0x0c;
1845         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1846
1847         if (!mos7840_port->read_urb_busy) {
1848                 mos7840_port->read_urb_busy = true;
1849                 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1850                 if (status) {
1851                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1852                             status);
1853                         mos7840_port->read_urb_busy = false;
1854                 }
1855         }
1856         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
1857                 mos7840_port->shadowLCR);
1858 }
1859
1860 /*****************************************************************************
1861  * mos7840_set_termios
1862  *      this function is called by the tty driver when it wants to change
1863  *      the termios structure
1864  *****************************************************************************/
1865
1866 static void mos7840_set_termios(struct tty_struct *tty,
1867                                 struct usb_serial_port *port,
1868                                 struct ktermios *old_termios)
1869 {
1870         int status;
1871         struct usb_serial *serial;
1872         struct moschip_port *mos7840_port;
1873
1874         if (mos7840_port_paranoia_check(port, __func__))
1875                 return;
1876
1877         serial = port->serial;
1878
1879         if (mos7840_serial_paranoia_check(serial, __func__))
1880                 return;
1881
1882         mos7840_port = mos7840_get_port_private(port);
1883
1884         if (mos7840_port == NULL)
1885                 return;
1886
1887         if (!mos7840_port->open) {
1888                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1889                 return;
1890         }
1891
1892         /* change the port settings to the new ones specified */
1893
1894         mos7840_change_port_settings(tty, mos7840_port, old_termios);
1895
1896         if (!mos7840_port->read_urb) {
1897                 dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n");
1898                 return;
1899         }
1900
1901         if (!mos7840_port->read_urb_busy) {
1902                 mos7840_port->read_urb_busy = true;
1903                 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1904                 if (status) {
1905                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1906                             status);
1907                         mos7840_port->read_urb_busy = false;
1908                 }
1909         }
1910 }
1911
1912 /*****************************************************************************
1913  * mos7840_get_lsr_info - get line status register info
1914  *
1915  * Purpose: Let user call ioctl() to get info when the UART physically
1916  *          is emptied.  On bus types like RS485, the transmitter must
1917  *          release the bus after transmitting. This must be done when
1918  *          the transmit shift register is empty, not be done when the
1919  *          transmit holding register is empty.  This functionality
1920  *          allows an RS485 driver to be written in user space.
1921  *****************************************************************************/
1922
1923 static int mos7840_get_lsr_info(struct tty_struct *tty,
1924                                 unsigned int __user *value)
1925 {
1926         int count;
1927         unsigned int result = 0;
1928
1929         count = mos7840_chars_in_buffer(tty);
1930         if (count == 0)
1931                 result = TIOCSER_TEMT;
1932
1933         if (copy_to_user(value, &result, sizeof(int)))
1934                 return -EFAULT;
1935         return 0;
1936 }
1937
1938 /*****************************************************************************
1939  * mos7840_get_serial_info
1940  *      function to get information about serial port
1941  *****************************************************************************/
1942
1943 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
1944                                    struct serial_struct __user *retinfo)
1945 {
1946         struct serial_struct tmp;
1947
1948         if (mos7840_port == NULL)
1949                 return -1;
1950
1951         memset(&tmp, 0, sizeof(tmp));
1952
1953         tmp.type = PORT_16550A;
1954         tmp.line = mos7840_port->port->minor;
1955         tmp.port = mos7840_port->port->port_number;
1956         tmp.irq = 0;
1957         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1958         tmp.baud_base = 9600;
1959         tmp.close_delay = 5 * HZ;
1960         tmp.closing_wait = 30 * HZ;
1961
1962         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1963                 return -EFAULT;
1964         return 0;
1965 }
1966
1967 /*****************************************************************************
1968  * SerialIoctl
1969  *      this function handles any ioctl calls to the driver
1970  *****************************************************************************/
1971
1972 static int mos7840_ioctl(struct tty_struct *tty,
1973                          unsigned int cmd, unsigned long arg)
1974 {
1975         struct usb_serial_port *port = tty->driver_data;
1976         void __user *argp = (void __user *)arg;
1977         struct moschip_port *mos7840_port;
1978
1979         if (mos7840_port_paranoia_check(port, __func__))
1980                 return -1;
1981
1982         mos7840_port = mos7840_get_port_private(port);
1983
1984         if (mos7840_port == NULL)
1985                 return -1;
1986
1987         switch (cmd) {
1988                 /* return number of bytes available */
1989
1990         case TIOCSERGETLSR:
1991                 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
1992                 return mos7840_get_lsr_info(tty, argp);
1993
1994         case TIOCGSERIAL:
1995                 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
1996                 return mos7840_get_serial_info(mos7840_port, argp);
1997
1998         case TIOCSSERIAL:
1999                 dev_dbg(&port->dev, "%s TIOCSSERIAL\n", __func__);
2000                 break;
2001         default:
2002                 break;
2003         }
2004         return -ENOIOCTLCMD;
2005 }
2006
2007 static int mos7810_check(struct usb_serial *serial)
2008 {
2009         int i, pass_count = 0;
2010         u8 *buf;
2011         __u16 data = 0, mcr_data = 0;
2012         __u16 test_pattern = 0x55AA;
2013         int res;
2014
2015         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2016         if (!buf)
2017                 return 0;       /* failed to identify 7810 */
2018
2019         /* Store MCR setting */
2020         res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2021                 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
2022                 buf, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2023         if (res == VENDOR_READ_LENGTH)
2024                 mcr_data = *buf;
2025
2026         for (i = 0; i < 16; i++) {
2027                 /* Send the 1-bit test pattern out to MCS7810 test pin */
2028                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2029                         MCS_WRREQ, MCS_WR_RTYPE,
2030                         (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
2031                         MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
2032
2033                 /* Read the test pattern back */
2034                 res = usb_control_msg(serial->dev,
2035                                 usb_rcvctrlpipe(serial->dev, 0), MCS_RDREQ,
2036                                 MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2037                                 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2038                 if (res == VENDOR_READ_LENGTH)
2039                         data = *buf;
2040
2041                 /* If this is a MCS7810 device, both test patterns must match */
2042                 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
2043                         break;
2044
2045                 pass_count++;
2046         }
2047
2048         /* Restore MCR setting */
2049         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
2050                 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
2051                 0, MOS_WDR_TIMEOUT);
2052
2053         kfree(buf);
2054
2055         if (pass_count == 16)
2056                 return 1;
2057
2058         return 0;
2059 }
2060
2061 static int mos7840_probe(struct usb_serial *serial,
2062                                 const struct usb_device_id *id)
2063 {
2064         u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
2065         u8 *buf;
2066         int device_type;
2067
2068         if (product == MOSCHIP_DEVICE_ID_7810 ||
2069                 product == MOSCHIP_DEVICE_ID_7820) {
2070                 device_type = product;
2071                 goto out;
2072         }
2073
2074         buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2075         if (!buf)
2076                 return -ENOMEM;
2077
2078         usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2079                         MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2080                         VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2081
2082         /* For a MCS7840 device GPIO0 must be set to 1 */
2083         if (buf[0] & 0x01)
2084                 device_type = MOSCHIP_DEVICE_ID_7840;
2085         else if (mos7810_check(serial))
2086                 device_type = MOSCHIP_DEVICE_ID_7810;
2087         else
2088                 device_type = MOSCHIP_DEVICE_ID_7820;
2089
2090         kfree(buf);
2091 out:
2092         usb_set_serial_data(serial, (void *)(unsigned long)device_type);
2093
2094         return 0;
2095 }
2096
2097 static int mos7840_calc_num_ports(struct usb_serial *serial,
2098                                         struct usb_serial_endpoints *epds)
2099 {
2100         int device_type = (unsigned long)usb_get_serial_data(serial);
2101         int num_ports;
2102
2103         num_ports = (device_type >> 4) & 0x000F;
2104
2105         /*
2106          * num_ports is currently never zero as device_type is one of
2107          * MOSCHIP_DEVICE_ID_78{1,2,4}0.
2108          */
2109         if (num_ports == 0)
2110                 return -ENODEV;
2111
2112         if (epds->num_bulk_in < num_ports || epds->num_bulk_out < num_ports) {
2113                 dev_err(&serial->interface->dev, "missing endpoints\n");
2114                 return -ENODEV;
2115         }
2116
2117         return num_ports;
2118 }
2119
2120 static int mos7840_port_probe(struct usb_serial_port *port)
2121 {
2122         struct usb_serial *serial = port->serial;
2123         int device_type = (unsigned long)usb_get_serial_data(serial);
2124         struct moschip_port *mos7840_port;
2125         int status;
2126         int pnum;
2127         __u16 Data;
2128
2129         /* we set up the pointers to the endpoints in the mos7840_open *
2130          * function, as the structures aren't created yet.             */
2131
2132         pnum = port->port_number;
2133
2134         dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
2135         mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2136         if (!mos7840_port)
2137                 return -ENOMEM;
2138
2139         /* Initialize all port interrupt end point to port 0 int
2140          * endpoint. Our device has only one interrupt end point
2141          * common to all port */
2142
2143         mos7840_port->port = port;
2144         mos7840_set_port_private(port, mos7840_port);
2145         spin_lock_init(&mos7840_port->pool_lock);
2146
2147         /* minor is not initialised until later by
2148          * usb-serial.c:get_free_serial() and cannot therefore be used
2149          * to index device instances */
2150         mos7840_port->port_num = pnum + 1;
2151         dev_dbg(&port->dev, "port->minor = %d\n", port->minor);
2152         dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
2153
2154         if (mos7840_port->port_num == 1) {
2155                 mos7840_port->SpRegOffset = 0x0;
2156                 mos7840_port->ControlRegOffset = 0x1;
2157                 mos7840_port->DcrRegOffset = 0x4;
2158         } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 4)) {
2159                 mos7840_port->SpRegOffset = 0x8;
2160                 mos7840_port->ControlRegOffset = 0x9;
2161                 mos7840_port->DcrRegOffset = 0x16;
2162         } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 2)) {
2163                 mos7840_port->SpRegOffset = 0xa;
2164                 mos7840_port->ControlRegOffset = 0xb;
2165                 mos7840_port->DcrRegOffset = 0x19;
2166         } else if ((mos7840_port->port_num == 3) && (serial->num_ports == 4)) {
2167                 mos7840_port->SpRegOffset = 0xa;
2168                 mos7840_port->ControlRegOffset = 0xb;
2169                 mos7840_port->DcrRegOffset = 0x19;
2170         } else if ((mos7840_port->port_num == 4) && (serial->num_ports == 4)) {
2171                 mos7840_port->SpRegOffset = 0xc;
2172                 mos7840_port->ControlRegOffset = 0xd;
2173                 mos7840_port->DcrRegOffset = 0x1c;
2174         }
2175         mos7840_dump_serial_port(port, mos7840_port);
2176         mos7840_set_port_private(port, mos7840_port);
2177
2178         /* enable rx_disable bit in control register */
2179         status = mos7840_get_reg_sync(port,
2180                         mos7840_port->ControlRegOffset, &Data);
2181         if (status < 0) {
2182                 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
2183                 goto out;
2184         } else
2185                 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
2186         Data |= 0x08;   /* setting driver done bit */
2187         Data |= 0x04;   /* sp1_bit to have cts change reflect in
2188                            modem status reg */
2189
2190         /* Data |= 0x20; //rx_disable bit */
2191         status = mos7840_set_reg_sync(port,
2192                         mos7840_port->ControlRegOffset, Data);
2193         if (status < 0) {
2194                 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2195                 goto out;
2196         } else
2197                 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
2198
2199         /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2200            and 0x24 in DCR3 */
2201         Data = 0x01;
2202         status = mos7840_set_reg_sync(port,
2203                         (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2204         if (status < 0) {
2205                 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
2206                 goto out;
2207         } else
2208                 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
2209
2210         Data = 0x05;
2211         status = mos7840_set_reg_sync(port,
2212                         (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2213         if (status < 0) {
2214                 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
2215                 goto out;
2216         } else
2217                 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
2218
2219         Data = 0x24;
2220         status = mos7840_set_reg_sync(port,
2221                         (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2222         if (status < 0) {
2223                 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
2224                 goto out;
2225         } else
2226                 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
2227
2228         /* write values in clkstart0x0 and clkmulti 0x20 */
2229         Data = 0x0;
2230         status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
2231         if (status < 0) {
2232                 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2233                 goto out;
2234         } else
2235                 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2236
2237         Data = 0x20;
2238         status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
2239         if (status < 0) {
2240                 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
2241                 goto error;
2242         } else
2243                 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
2244
2245         /* write value 0x0 to scratchpad register */
2246         Data = 0x00;
2247         status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
2248         if (status < 0) {
2249                 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
2250                 goto out;
2251         } else
2252                 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
2253
2254         /* Zero Length flag register */
2255         if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
2256                 Data = 0xff;
2257                 status = mos7840_set_reg_sync(port,
2258                                 (__u16) (ZLP_REG1 +
2259                                         ((__u16)mos7840_port->port_num)), Data);
2260                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2261                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
2262                 if (status < 0) {
2263                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
2264                         goto out;
2265                 } else
2266                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
2267         } else {
2268                 Data = 0xff;
2269                 status = mos7840_set_reg_sync(port,
2270                                 (__u16) (ZLP_REG1 +
2271                                         ((__u16)mos7840_port->port_num) - 0x1), Data);
2272                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2273                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
2274                 if (status < 0) {
2275                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
2276                         goto out;
2277                 } else
2278                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
2279
2280         }
2281         mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2282         mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2283         mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2284                         GFP_KERNEL);
2285         if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2286                         !mos7840_port->dr) {
2287                 status = -ENOMEM;
2288                 goto error;
2289         }
2290
2291         mos7840_port->has_led = false;
2292
2293         /* Initialize LED timers */
2294         if (device_type == MOSCHIP_DEVICE_ID_7810) {
2295                 mos7840_port->has_led = true;
2296
2297                 mos7840_port->led_urb = usb_alloc_urb(0, GFP_KERNEL);
2298                 mos7840_port->led_dr = kmalloc(sizeof(*mos7840_port->led_dr),
2299                                                                 GFP_KERNEL);
2300                 if (!mos7840_port->led_urb || !mos7840_port->led_dr) {
2301                         status = -ENOMEM;
2302                         goto error;
2303                 }
2304
2305                 setup_timer(&mos7840_port->led_timer1, mos7840_led_off,
2306                             (unsigned long)mos7840_port);
2307                 mos7840_port->led_timer1.expires =
2308                         jiffies + msecs_to_jiffies(LED_ON_MS);
2309                 setup_timer(&mos7840_port->led_timer2, mos7840_led_flag_off,
2310                             (unsigned long)mos7840_port);
2311                 mos7840_port->led_timer2.expires =
2312                         jiffies + msecs_to_jiffies(LED_OFF_MS);
2313
2314                 /* Turn off LED */
2315                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2316         }
2317 out:
2318         if (pnum == serial->num_ports - 1) {
2319                 /* Zero Length flag enable */
2320                 Data = 0x0f;
2321                 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2322                 if (status < 0) {
2323                         dev_dbg(&port->dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
2324                         goto error;
2325                 } else
2326                         dev_dbg(&port->dev, "ZLP_REG5 Writing success status%d\n", status);
2327
2328                 /* setting configuration feature to one */
2329                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2330                                 0x03, 0x00, 0x01, 0x00, NULL, 0x00,
2331                                 MOS_WDR_TIMEOUT);
2332         }
2333         return 0;
2334 error:
2335         kfree(mos7840_port->led_dr);
2336         usb_free_urb(mos7840_port->led_urb);
2337         kfree(mos7840_port->dr);
2338         kfree(mos7840_port->ctrl_buf);
2339         usb_free_urb(mos7840_port->control_urb);
2340         kfree(mos7840_port);
2341
2342         return status;
2343 }
2344
2345 static int mos7840_port_remove(struct usb_serial_port *port)
2346 {
2347         struct moschip_port *mos7840_port;
2348
2349         mos7840_port = mos7840_get_port_private(port);
2350
2351         if (mos7840_port->has_led) {
2352                 /* Turn off LED */
2353                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2354
2355                 del_timer_sync(&mos7840_port->led_timer1);
2356                 del_timer_sync(&mos7840_port->led_timer2);
2357
2358                 usb_kill_urb(mos7840_port->led_urb);
2359                 usb_free_urb(mos7840_port->led_urb);
2360                 kfree(mos7840_port->led_dr);
2361         }
2362         usb_kill_urb(mos7840_port->control_urb);
2363         usb_free_urb(mos7840_port->control_urb);
2364         kfree(mos7840_port->ctrl_buf);
2365         kfree(mos7840_port->dr);
2366         kfree(mos7840_port);
2367
2368         return 0;
2369 }
2370
2371 static struct usb_serial_driver moschip7840_4port_device = {
2372         .driver = {
2373                    .owner = THIS_MODULE,
2374                    .name = "mos7840",
2375                    },
2376         .description = DRIVER_DESC,
2377         .id_table = id_table,
2378         .num_interrupt_in = 1,
2379         .open = mos7840_open,
2380         .close = mos7840_close,
2381         .write = mos7840_write,
2382         .write_room = mos7840_write_room,
2383         .chars_in_buffer = mos7840_chars_in_buffer,
2384         .throttle = mos7840_throttle,
2385         .unthrottle = mos7840_unthrottle,
2386         .calc_num_ports = mos7840_calc_num_ports,
2387         .probe = mos7840_probe,
2388         .ioctl = mos7840_ioctl,
2389         .set_termios = mos7840_set_termios,
2390         .break_ctl = mos7840_break,
2391         .tiocmget = mos7840_tiocmget,
2392         .tiocmset = mos7840_tiocmset,
2393         .tiocmiwait = usb_serial_generic_tiocmiwait,
2394         .get_icount = usb_serial_generic_get_icount,
2395         .port_probe = mos7840_port_probe,
2396         .port_remove = mos7840_port_remove,
2397         .read_bulk_callback = mos7840_bulk_in_callback,
2398         .read_int_callback = mos7840_interrupt_callback,
2399 };
2400
2401 static struct usb_serial_driver * const serial_drivers[] = {
2402         &moschip7840_4port_device, NULL
2403 };
2404
2405 module_usb_serial_driver(serial_drivers, id_table);
2406
2407 MODULE_DESCRIPTION(DRIVER_DESC);
2408 MODULE_LICENSE("GPL");