drivers/usb/serial/mos7840.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  15  *
  16  * Clean ups from Moschip version and a few ioctl implementations by:
  17  *      Paul B Schroeder <pschroeder "at" uplogix "dot" com>
  18  *
  19  * Originally based on drivers/usb/serial/io_edgeport.c which is:
  20  *      Copyright (C) 2000 Inside Out Networks, All rights reserved.
  21  *      Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
  22  *
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/errno.h>
  27 #include <linux/init.h>
  28 #include <linux/slab.h>
  29 #include <linux/tty.h>
  30 #include <linux/tty_driver.h>
  31 #include <linux/tty_flip.h>
  32 #include <linux/module.h>
  33 #include <linux/serial.h>
  34 #include <linux/usb.h>
  35 #include <linux/usb/serial.h>
  36 #include <linux/uaccess.h>
  37
  38 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
  39
  40 /*
  41  * 16C50 UART register defines
  42  */
  43
  44 #define LCR_BITS_5             0x00     /* 5 bits/char */
  45 #define LCR_BITS_6             0x01     /* 6 bits/char */
  46 #define LCR_BITS_7             0x02     /* 7 bits/char */
  47 #define LCR_BITS_8             0x03     /* 8 bits/char */
  48 #define LCR_BITS_MASK          0x03     /* Mask for bits/char field */
  49
  50 #define LCR_STOP_1             0x00     /* 1 stop bit */
  51 #define LCR_STOP_1_5           0x04     /* 1.5 stop bits (if 5   bits/char) */
  52 #define LCR_STOP_2             0x04     /* 2 stop bits   (if 6-8 bits/char) */
  53 #define LCR_STOP_MASK          0x04     /* Mask for stop bits field */
  54
  55 #define LCR_PAR_NONE           0x00     /* No parity */
  56 #define LCR_PAR_ODD            0x08     /* Odd parity */
  57 #define LCR_PAR_EVEN           0x18     /* Even parity */
  58 #define LCR_PAR_MARK           0x28     /* Force parity bit to 1 */
  59 #define LCR_PAR_SPACE          0x38     /* Force parity bit to 0 */
  60 #define LCR_PAR_MASK           0x38     /* Mask for parity field */
  61
  62 #define LCR_SET_BREAK          0x40     /* Set Break condition */
  63 #define LCR_DL_ENABLE          0x80     /* Enable access to divisor latch */
  64
  65 #define MCR_DTR                0x01     /* Assert DTR */
  66 #define MCR_RTS                0x02     /* Assert RTS */
  67 #define MCR_OUT1               0x04     /* Loopback only: Sets state of RI */
  68 #define MCR_MASTER_IE          0x08     /* Enable interrupt outputs */
  69 #define MCR_LOOPBACK           0x10     /* Set internal (digital) loopback mode */
  70 #define MCR_XON_ANY            0x20     /* Enable any char to exit XOFF mode */
  71
  72 #define MOS7840_MSR_CTS        0x10     /* Current state of CTS */
  73 #define MOS7840_MSR_DSR        0x20     /* Current state of DSR */
  74 #define MOS7840_MSR_RI         0x40     /* Current state of RI */
  75 #define MOS7840_MSR_CD         0x80     /* Current state of CD */
  76
  77 /*
  78  * Defines used for sending commands to port
  79  */
  80
  81 #define MOS_WDR_TIMEOUT         5000    /* default urb timeout */
  82
  83 #define MOS_PORT1       0x0200
  84 #define MOS_PORT2       0x0300
  85 #define MOS_VENREG      0x0000
  86 #define MOS_MAX_PORT    0x02
  87 #define MOS_WRITE       0x0E
  88 #define MOS_READ        0x0D
  89
  90 /* Requests */
  91 #define MCS_RD_RTYPE    0xC0
  92 #define MCS_WR_RTYPE    0x40
  93 #define MCS_RDREQ       0x0D
  94 #define MCS_WRREQ       0x0E
  95 #define MCS_CTRL_TIMEOUT        500
  96 #define VENDOR_READ_LENGTH      (0x01)
  97
  98 #define MAX_NAME_LEN    64
  99
 100 #define ZLP_REG1  0x3A          /* Zero_Flag_Reg1    58 */
 101 #define ZLP_REG5  0x3E          /* Zero_Flag_Reg5    62 */
 102
 103 /* For higher baud Rates use TIOCEXBAUD */
 104 #define TIOCEXBAUD     0x5462
 105
 106 /* vendor id and device id defines */
 107
 108 /* The native mos7840/7820 component */
 109 #define USB_VENDOR_ID_MOSCHIP           0x9710
 110 #define MOSCHIP_DEVICE_ID_7840          0x7840
 111 #define MOSCHIP_DEVICE_ID_7820          0x7820
 112 #define MOSCHIP_DEVICE_ID_7810          0x7810
 113 /* The native component can have its vendor/device id's overridden
 114  * in vendor-specific implementations.  Such devices can be handled
 115  * by making a change here, in id_table.
 116  */
 117 #define USB_VENDOR_ID_BANDB              0x0856
 118 #define BANDB_DEVICE_ID_USO9ML2_2        0xAC22
 119 #define BANDB_DEVICE_ID_USO9ML2_2P       0xBC00
 120 #define BANDB_DEVICE_ID_USO9ML2_4        0xAC24
 121 #define BANDB_DEVICE_ID_USO9ML2_4P       0xBC01
 122 #define BANDB_DEVICE_ID_US9ML2_2         0xAC29
 123 #define BANDB_DEVICE_ID_US9ML2_4         0xAC30
 124 #define BANDB_DEVICE_ID_USPTL4_2         0xAC31
 125 #define BANDB_DEVICE_ID_USPTL4_4         0xAC32
 126 #define BANDB_DEVICE_ID_USOPTL4_2        0xAC42
 127 #define BANDB_DEVICE_ID_USOPTL4_2P       0xBC02
 128 #define BANDB_DEVICE_ID_USOPTL4_4        0xAC44
 129 #define BANDB_DEVICE_ID_USOPTL4_4P       0xBC03
 130 #define BANDB_DEVICE_ID_USOPTL2_4        0xAC24
 131
 132 /* This driver also supports
 133  * ATEN UC2324 device using Moschip MCS7840
 134  * ATEN UC2322 device using Moschip MCS7820
 135  */
 136 #define USB_VENDOR_ID_ATENINTL          0x0557
 137 #define ATENINTL_DEVICE_ID_UC2324       0x2011
 138 #define ATENINTL_DEVICE_ID_UC2322       0x7820
 139
 140 /* Interrupt Routine Defines    */
 141
 142 #define SERIAL_IIR_RLS      0x06
 143 #define SERIAL_IIR_MS       0x00
 144
 145 /*
 146  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 147  */
 148 #define SERIAL_LSR_DR       0x0001
 149 #define SERIAL_LSR_OE       0x0002
 150 #define SERIAL_LSR_PE       0x0004
 151 #define SERIAL_LSR_FE       0x0008
 152 #define SERIAL_LSR_BI       0x0010
 153
 154 #define MOS_MSR_DELTA_CTS   0x10
 155 #define MOS_MSR_DELTA_DSR   0x20
 156 #define MOS_MSR_DELTA_RI    0x40
 157 #define MOS_MSR_DELTA_CD    0x80
 158
 159 /* Serial Port register Address */
 160 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 161 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 162 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 163 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 164 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 165 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 166 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 167 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 168 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 169
 170 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 171 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 172 #define GPIO_REGISTER              ((__u16)(0x07))
 173
 174 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 175
 176 /*
 177  * URB POOL related defines
 178  */
 179 #define NUM_URBS                        16      /* URB Count */
 180 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 181
 182 /* LED on/off milliseconds*/
 183 #define LED_ON_MS       500
 184 #define LED_OFF_MS      500
 185
 186 static int device_type;
 187
 188 static const struct usb_device_id id_table[] = {
 189         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 190         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 191         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
 192         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
 193         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
 194         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 195         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
 196         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 197         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 198         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 199         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 200         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 201         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
 202         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 203         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
 204         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
 205         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 206         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 207         {}                      /* terminating entry */
 208 };
 209 MODULE_DEVICE_TABLE(usb, id_table);
 210
 211 /* This structure holds all of the local port information */
 212
 213 struct moschip_port {
 214         int port_num;           /*Actual port number in the device(1,2,etc) */
 215         struct urb *write_urb;  /* write URB for this port */
 216         struct urb *read_urb;   /* read URB for this port */
 217         __u8 shadowLCR;         /* last LCR value received */
 218         __u8 shadowMCR;         /* last MCR value received */
 219         char open;
 220         char open_ports;
 221         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 222         int delta_msr_cond;
 223         struct async_icount icount;
 224         struct usb_serial_port *port;   /* loop back to the owner of this object */
 225
 226         /* Offsets */
 227         __u8 SpRegOffset;
 228         __u8 ControlRegOffset;
 229         __u8 DcrRegOffset;
 230         /* for processing control URBS in interrupt context */
 231         struct urb *control_urb;
 232         struct usb_ctrlrequest *dr;
 233         char *ctrl_buf;
 234         int MsrLsr;
 235
 236         spinlock_t pool_lock;
 237         struct urb *write_urb_pool[NUM_URBS];
 238         char busy[NUM_URBS];
 239         bool read_urb_busy;
 240
 241         /* For device(s) with LED indicator */
 242         bool has_led;
 243         bool led_flag;
 244         struct timer_list led_timer1;   /* Timer for LED on */
 245         struct timer_list led_timer2;   /* Timer for LED off */
 246 };
 247
 248 /*
 249  * mos7840_set_reg_sync
 250  *      To set the Control register by calling usb_fill_control_urb function
 251  *      by passing usb_sndctrlpipe function as parameter.
 252  */
 253
 254 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 255                                 __u16 val)
 256 {
 257         struct usb_device *dev = port->serial->dev;
 258         val = val & 0x00ff;
 259         dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
 260
 261         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 262                                MCS_WR_RTYPE, val, reg, NULL, 0,
 263                                MOS_WDR_TIMEOUT);
 264 }
 265
 266 /*
 267  * mos7840_get_reg_sync
 268  *      To set the Uart register by calling usb_fill_control_urb function by
 269  *      passing usb_rcvctrlpipe function as parameter.
 270  */
 271
 272 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 273                                 __u16 *val)
 274 {
 275         struct usb_device *dev = port->serial->dev;
 276         int ret = 0;
 277         u8 *buf;
 278
 279         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 280         if (!buf)
 281                 return -ENOMEM;
 282
 283         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 284                               MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
 285                               MOS_WDR_TIMEOUT);
 286         *val = buf[0];
 287         dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
 288
 289         kfree(buf);
 290         return ret;
 291 }
 292
 293 /*
 294  * mos7840_set_uart_reg
 295  *      To set the Uart register by calling usb_fill_control_urb function by
 296  *      passing usb_sndctrlpipe function as parameter.
 297  */
 298
 299 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 300                                 __u16 val)
 301 {
 302
 303         struct usb_device *dev = port->serial->dev;
 304         val = val & 0x00ff;
 305         /* For the UART control registers, the application number need
 306            to be Or'ed */
 307         if (port->serial->num_ports == 4) {
 308                 val |= (((__u16) port->number -
 309                                 (__u16) (port->serial->minor)) + 1) << 8;
 310         } else {
 311                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 312                         val |= (((__u16) port->number -
 313                               (__u16) (port->serial->minor)) + 1) << 8;
 314                 } else {
 315                         val |= (((__u16) port->number -
 316                               (__u16) (port->serial->minor)) + 2) << 8;
 317                 }
 318         }
 319         dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
 320         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 321                                MCS_WR_RTYPE, val, reg, NULL, 0,
 322                                MOS_WDR_TIMEOUT);
 323
 324 }
 325
 326 /*
 327  * mos7840_get_uart_reg
 328  *      To set the Control register by calling usb_fill_control_urb function
 329  *      by passing usb_rcvctrlpipe function as parameter.
 330  */
 331 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 332                                 __u16 *val)
 333 {
 334         struct usb_device *dev = port->serial->dev;
 335         int ret = 0;
 336         __u16 Wval;
 337         u8 *buf;
 338
 339         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 340         if (!buf)
 341                 return -ENOMEM;
 342
 343         /* Wval  is same as application number */
 344         if (port->serial->num_ports == 4) {
 345                 Wval =
 346                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 347                      1) << 8;
 348         } else {
 349                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 350                         Wval = (((__u16) port->number -
 351                               (__u16) (port->serial->minor)) + 1) << 8;
 352                 } else {
 353                         Wval = (((__u16) port->number -
 354                               (__u16) (port->serial->minor)) + 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         *val = buf[0];
 362
 363         kfree(buf);
 364         return ret;
 365 }
 366
 367 static void mos7840_dump_serial_port(struct usb_serial_port *port,
 368                                      struct moschip_port *mos7840_port)
 369 {
 370
 371         dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
 372         dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
 373         dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
 374
 375 }
 376
 377 /************************************************************************/
 378 /************************************************************************/
 379 /*             I N T E R F A C E   F U N C T I O N S                    */
 380 /*             I N T E R F A C E   F U N C T I O N S                    */
 381 /************************************************************************/
 382 /************************************************************************/
 383
 384 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 385                                             struct moschip_port *data)
 386 {
 387         usb_set_serial_port_data(port, (void *)data);
 388 }
 389
 390 static inline struct moschip_port *mos7840_get_port_private(struct
 391                                                             usb_serial_port
 392                                                             *port)
 393 {
 394         return (struct moschip_port *)usb_get_serial_port_data(port);
 395 }
 396
 397 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 398 {
 399         struct moschip_port *mos7840_port;
 400         struct async_icount *icount;
 401         mos7840_port = port;
 402         icount = &mos7840_port->icount;
 403         if (new_msr &
 404             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 405              MOS_MSR_DELTA_CD)) {
 406                 icount = &mos7840_port->icount;
 407
 408                 /* update input line counters */
 409                 if (new_msr & MOS_MSR_DELTA_CTS) {
 410                         icount->cts++;
 411                         smp_wmb();
 412                 }
 413                 if (new_msr & MOS_MSR_DELTA_DSR) {
 414                         icount->dsr++;
 415                         smp_wmb();
 416                 }
 417                 if (new_msr & MOS_MSR_DELTA_CD) {
 418                         icount->dcd++;
 419                         smp_wmb();
 420                 }
 421                 if (new_msr & MOS_MSR_DELTA_RI) {
 422                         icount->rng++;
 423                         smp_wmb();
 424                 }
 425
 426                 mos7840_port->delta_msr_cond = 1;
 427                 wake_up_interruptible(&port->port->delta_msr_wait);
 428         }
 429 }
 430
 431 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 432 {
 433         struct async_icount *icount;
 434
 435         if (new_lsr & SERIAL_LSR_BI) {
 436                 /*
 437                  * Parity and Framing errors only count if they
 438                  * occur exclusive of a break being
 439                  * received.
 440                  */
 441                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 442         }
 443
 444         /* update input line counters */
 445         icount = &port->icount;
 446         if (new_lsr & SERIAL_LSR_BI) {
 447                 icount->brk++;
 448                 smp_wmb();
 449         }
 450         if (new_lsr & SERIAL_LSR_OE) {
 451                 icount->overrun++;
 452                 smp_wmb();
 453         }
 454         if (new_lsr & SERIAL_LSR_PE) {
 455                 icount->parity++;
 456                 smp_wmb();
 457         }
 458         if (new_lsr & SERIAL_LSR_FE) {
 459                 icount->frame++;
 460                 smp_wmb();
 461         }
 462 }
 463
 464 /************************************************************************/
 465 /************************************************************************/
 466 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 467 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 468 /************************************************************************/
 469 /************************************************************************/
 470
 471 static void mos7840_control_callback(struct urb *urb)
 472 {
 473         unsigned char *data;
 474         struct moschip_port *mos7840_port;
 475         struct device *dev = &urb->dev->dev;
 476         __u8 regval = 0x0;
 477         int status = urb->status;
 478
 479         mos7840_port = urb->context;
 480
 481         switch (status) {
 482         case 0:
 483                 /* success */
 484                 break;
 485         case -ECONNRESET:
 486         case -ENOENT:
 487         case -ESHUTDOWN:
 488                 /* this urb is terminated, clean up */
 489                 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
 490                 return;
 491         default:
 492                 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
 493                 return;
 494         }
 495
 496         dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length);
 497         dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__,
 498                 mos7840_port->MsrLsr, mos7840_port->port_num);
 499         data = urb->transfer_buffer;
 500         regval = (__u8) data[0];
 501         dev_dbg(dev, "%s data is %x\n", __func__, regval);
 502         if (mos7840_port->MsrLsr == 0)
 503                 mos7840_handle_new_msr(mos7840_port, regval);
 504         else if (mos7840_port->MsrLsr == 1)
 505                 mos7840_handle_new_lsr(mos7840_port, regval);
 506 }
 507
 508 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 509                            __u16 *val)
 510 {
 511         struct usb_device *dev = mcs->port->serial->dev;
 512         struct usb_ctrlrequest *dr = mcs->dr;
 513         unsigned char *buffer = mcs->ctrl_buf;
 514         int ret;
 515
 516         dr->bRequestType = MCS_RD_RTYPE;
 517         dr->bRequest = MCS_RDREQ;
 518         dr->wValue = cpu_to_le16(Wval); /* 0 */
 519         dr->wIndex = cpu_to_le16(reg);
 520         dr->wLength = cpu_to_le16(2);
 521
 522         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 523                              (unsigned char *)dr, buffer, 2,
 524                              mos7840_control_callback, mcs);
 525         mcs->control_urb->transfer_buffer_length = 2;
 526         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 527         return ret;
 528 }
 529
 530 static void mos7840_set_led_callback(struct urb *urb)
 531 {
 532         switch (urb->status) {
 533         case 0:
 534                 /* Success */
 535                 break;
 536         case -ECONNRESET:
 537         case -ENOENT:
 538         case -ESHUTDOWN:
 539                 /* This urb is terminated, clean up */
 540                 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d",
 541                         __func__, urb->status);
 542                 break;
 543         default:
 544                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d",
 545                         __func__, urb->status);
 546         }
 547 }
 548
 549 static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
 550                                 __u16 reg)
 551 {
 552         struct usb_device *dev = mcs->port->serial->dev;
 553         struct usb_ctrlrequest *dr = mcs->dr;
 554
 555         dr->bRequestType = MCS_WR_RTYPE;
 556         dr->bRequest = MCS_WRREQ;
 557         dr->wValue = cpu_to_le16(wval);
 558         dr->wIndex = cpu_to_le16(reg);
 559         dr->wLength = cpu_to_le16(0);
 560
 561         usb_fill_control_urb(mcs->control_urb, dev, usb_sndctrlpipe(dev, 0),
 562                 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
 563
 564         usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 565 }
 566
 567 static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
 568                                 __u16 val)
 569 {
 570         struct usb_device *dev = port->serial->dev;
 571
 572         usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
 573                         val, reg, NULL, 0, MOS_WDR_TIMEOUT);
 574 }
 575
 576 static void mos7840_led_off(unsigned long arg)
 577 {
 578         struct moschip_port *mcs = (struct moschip_port *) arg;
 579
 580         /* Turn off LED */
 581         mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
 582         mod_timer(&mcs->led_timer2,
 583                                 jiffies + msecs_to_jiffies(LED_OFF_MS));
 584 }
 585
 586 static void mos7840_led_flag_off(unsigned long arg)
 587 {
 588         struct moschip_port *mcs = (struct moschip_port *) arg;
 589
 590         mcs->led_flag = false;
 591 }
 592
 593 /*****************************************************************************
 594  * mos7840_interrupt_callback
 595  *      this is the callback function for when we have received data on the
 596  *      interrupt endpoint.
 597  *****************************************************************************/
 598
 599 static void mos7840_interrupt_callback(struct urb *urb)
 600 {
 601         int result;
 602         int length;
 603         struct moschip_port *mos7840_port;
 604         struct usb_serial *serial;
 605         __u16 Data;
 606         unsigned char *data;
 607         __u8 sp[5], st;
 608         int i, rv = 0;
 609         __u16 wval, wreg = 0;
 610         int status = urb->status;
 611
 612         switch (status) {
 613         case 0:
 614                 /* success */
 615                 break;
 616         case -ECONNRESET:
 617         case -ENOENT:
 618         case -ESHUTDOWN:
 619                 /* this urb is terminated, clean up */
 620                 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
 621                         __func__, status);
 622                 return;
 623         default:
 624                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
 625                         __func__, status);
 626                 goto exit;
 627         }
 628
 629         length = urb->actual_length;
 630         data = urb->transfer_buffer;
 631
 632         serial = urb->context;
 633
 634         /* Moschip get 5 bytes
 635          * Byte 1 IIR Port 1 (port.number is 0)
 636          * Byte 2 IIR Port 2 (port.number is 1)
 637          * Byte 3 IIR Port 3 (port.number is 2)
 638          * Byte 4 IIR Port 4 (port.number is 3)
 639          * Byte 5 FIFO status for both */
 640
 641         if (length && length > 5) {
 642                 dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n");
 643                 return;
 644         }
 645
 646         sp[0] = (__u8) data[0];
 647         sp[1] = (__u8) data[1];
 648         sp[2] = (__u8) data[2];
 649         sp[3] = (__u8) data[3];
 650         st = (__u8) data[4];
 651
 652         for (i = 0; i < serial->num_ports; i++) {
 653                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 654                 wval =
 655                     (((__u16) serial->port[i]->number -
 656                       (__u16) (serial->minor)) + 1) << 8;
 657                 if (mos7840_port->open) {
 658                         if (sp[i] & 0x01) {
 659                                 dev_dbg(&urb->dev->dev, "SP%d No Interrupt !!!\n", i);
 660                         } else {
 661                                 switch (sp[i] & 0x0f) {
 662                                 case SERIAL_IIR_RLS:
 663                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Receiver status error or \n", i);
 664                                         dev_dbg(&urb->dev->dev, "address bit detected in 9-bit mode\n");
 665                                         mos7840_port->MsrLsr = 1;
 666                                         wreg = LINE_STATUS_REGISTER;
 667                                         break;
 668                                 case SERIAL_IIR_MS:
 669                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Modem status change\n", i);
 670                                         mos7840_port->MsrLsr = 0;
 671                                         wreg = MODEM_STATUS_REGISTER;
 672                                         break;
 673                                 }
 674                                 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 675                         }
 676                 }
 677         }
 678         if (!(rv < 0))
 679                 /* the completion handler for the control urb will resubmit */
 680                 return;
 681 exit:
 682         result = usb_submit_urb(urb, GFP_ATOMIC);
 683         if (result) {
 684                 dev_err(&urb->dev->dev,
 685                         "%s - Error %d submitting interrupt urb\n",
 686                         __func__, result);
 687         }
 688 }
 689
 690 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 691                                        const char *function)
 692 {
 693         if (!port) {
 694                 pr_debug("%s - port == NULL\n", function);
 695                 return -1;
 696         }
 697         if (!port->serial) {
 698                 pr_debug("%s - port->serial == NULL\n", function);
 699                 return -1;
 700         }
 701
 702         return 0;
 703 }
 704
 705 /* Inline functions to check the sanity of a pointer that is passed to us */
 706 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 707                                          const char *function)
 708 {
 709         if (!serial) {
 710                 pr_debug("%s - serial == NULL\n", function);
 711                 return -1;
 712         }
 713         if (!serial->type) {
 714                 pr_debug("%s - serial->type == NULL!\n", function);
 715                 return -1;
 716         }
 717
 718         return 0;
 719 }
 720
 721 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 722                                                  const char *function)
 723 {
 724         /* if no port was specified, or it fails a paranoia check */
 725         if (!port ||
 726             mos7840_port_paranoia_check(port, function) ||
 727             mos7840_serial_paranoia_check(port->serial, function)) {
 728                 /* then say that we don't have a valid usb_serial thing,
 729                  * which will end up genrating -ENODEV return values */
 730                 return NULL;
 731         }
 732
 733         return port->serial;
 734 }
 735
 736 /*****************************************************************************
 737  * mos7840_bulk_in_callback
 738  *      this is the callback function for when we have received data on the
 739  *      bulk in endpoint.
 740  *****************************************************************************/
 741
 742 static void mos7840_bulk_in_callback(struct urb *urb)
 743 {
 744         int retval;
 745         unsigned char *data;
 746         struct usb_serial *serial;
 747         struct usb_serial_port *port;
 748         struct moschip_port *mos7840_port;
 749         int status = urb->status;
 750
 751         mos7840_port = urb->context;
 752         if (!mos7840_port)
 753                 return;
 754
 755         if (status) {
 756                 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
 757                 mos7840_port->read_urb_busy = false;
 758                 return;
 759         }
 760
 761         port = mos7840_port->port;
 762         if (mos7840_port_paranoia_check(port, __func__)) {
 763                 mos7840_port->read_urb_busy = false;
 764                 return;
 765         }
 766
 767         serial = mos7840_get_usb_serial(port, __func__);
 768         if (!serial) {
 769                 mos7840_port->read_urb_busy = false;
 770                 return;
 771         }
 772
 773         data = urb->transfer_buffer;
 774         usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
 775
 776         if (urb->actual_length) {
 777                 struct tty_port *tport = &mos7840_port->port->port;
 778                 tty_insert_flip_string(tport, data, urb->actual_length);
 779                 tty_flip_buffer_push(tport);
 780                 mos7840_port->icount.rx += urb->actual_length;
 781                 smp_wmb();
 782                 dev_dbg(&port->dev, "mos7840_port->icount.rx is %d:\n", mos7840_port->icount.rx);
 783         }
 784
 785         if (!mos7840_port->read_urb) {
 786                 dev_dbg(&port->dev, "%s", "URB KILLED !!!\n");
 787                 mos7840_port->read_urb_busy = false;
 788                 return;
 789         }
 790
 791         /* Turn on LED */
 792         if (mos7840_port->has_led && !mos7840_port->led_flag) {
 793                 mos7840_port->led_flag = true;
 794                 mos7840_set_led_async(mos7840_port, 0x0301,
 795                                         MODEM_CONTROL_REGISTER);
 796                 mod_timer(&mos7840_port->led_timer1,
 797                                 jiffies + msecs_to_jiffies(LED_ON_MS));
 798         }
 799
 800         mos7840_port->read_urb_busy = true;
 801         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 802
 803         if (retval) {
 804                 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
 805                 mos7840_port->read_urb_busy = false;
 806         }
 807 }
 808
 809 /*****************************************************************************
 810  * mos7840_bulk_out_data_callback
 811  *      this is the callback function for when we have finished sending
 812  *      serial data on the bulk out endpoint.
 813  *****************************************************************************/
 814
 815 static void mos7840_bulk_out_data_callback(struct urb *urb)
 816 {
 817         struct moschip_port *mos7840_port;
 818         struct usb_serial_port *port;
 819         struct tty_struct *tty;
 820         int status = urb->status;
 821         int i;
 822
 823         mos7840_port = urb->context;
 824         port = mos7840_port->port;
 825         spin_lock(&mos7840_port->pool_lock);
 826         for (i = 0; i < NUM_URBS; i++) {
 827                 if (urb == mos7840_port->write_urb_pool[i]) {
 828                         mos7840_port->busy[i] = 0;
 829                         break;
 830                 }
 831         }
 832         spin_unlock(&mos7840_port->pool_lock);
 833
 834         if (status) {
 835                 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
 836                 return;
 837         }
 838
 839         if (mos7840_port_paranoia_check(port, __func__))
 840                 return;
 841
 842         tty = tty_port_tty_get(&port->port);
 843         if (tty && mos7840_port->open)
 844                 tty_wakeup(tty);
 845         tty_kref_put(tty);
 846
 847 }
 848
 849 /************************************************************************/
 850 /*       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       */
 851 /************************************************************************/
 852 #ifdef MCSSerialProbe
 853 static int mos7840_serial_probe(struct usb_serial *serial,
 854                                 const struct usb_device_id *id)
 855 {
 856
 857         /*need to implement the mode_reg reading and updating\
 858            structures usb_serial_ device_type\
 859            (i.e num_ports, num_bulkin,bulkout etc) */
 860         /* Also we can update the changes  attach */
 861         return 1;
 862 }
 863 #endif
 864
 865 /*****************************************************************************
 866  * mos7840_open
 867  *      this function is called by the tty driver when a port is opened
 868  *      If successful, we return 0
 869  *      Otherwise we return a negative error number.
 870  *****************************************************************************/
 871
 872 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
 873 {
 874         int response;
 875         int j;
 876         struct usb_serial *serial;
 877         struct urb *urb;
 878         __u16 Data;
 879         int status;
 880         struct moschip_port *mos7840_port;
 881         struct moschip_port *port0;
 882
 883         if (mos7840_port_paranoia_check(port, __func__))
 884                 return -ENODEV;
 885
 886         serial = port->serial;
 887
 888         if (mos7840_serial_paranoia_check(serial, __func__))
 889                 return -ENODEV;
 890
 891         mos7840_port = mos7840_get_port_private(port);
 892         port0 = mos7840_get_port_private(serial->port[0]);
 893
 894         if (mos7840_port == NULL || port0 == NULL)
 895                 return -ENODEV;
 896
 897         usb_clear_halt(serial->dev, port->write_urb->pipe);
 898         usb_clear_halt(serial->dev, port->read_urb->pipe);
 899         port0->open_ports++;
 900
 901         /* Initialising the write urb pool */
 902         for (j = 0; j < NUM_URBS; ++j) {
 903                 urb = usb_alloc_urb(0, GFP_KERNEL);
 904                 mos7840_port->write_urb_pool[j] = urb;
 905
 906                 if (urb == NULL) {
 907                         dev_err(&port->dev, "No more urbs???\n");
 908                         continue;
 909                 }
 910
 911                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 912                                                                 GFP_KERNEL);
 913                 if (!urb->transfer_buffer) {
 914                         usb_free_urb(urb);
 915                         mos7840_port->write_urb_pool[j] = NULL;
 916                         dev_err(&port->dev,
 917                                 "%s-out of memory for urb buffers.\n",
 918                                 __func__);
 919                         continue;
 920                 }
 921         }
 922
 923 /*****************************************************************************
 924  * Initialize MCS7840 -- Write Init values to corresponding Registers
 925  *
 926  * Register Index
 927  * 1 : IER
 928  * 2 : FCR
 929  * 3 : LCR
 930  * 4 : MCR
 931  *
 932  * 0x08 : SP1/2 Control Reg
 933  *****************************************************************************/
 934
 935         /* NEED to check the following Block */
 936
 937         Data = 0x0;
 938         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 939         if (status < 0) {
 940                 dev_dbg(&port->dev, "Reading Spreg failed\n");
 941                 return -1;
 942         }
 943         Data |= 0x80;
 944         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 945         if (status < 0) {
 946                 dev_dbg(&port->dev, "writing Spreg failed\n");
 947                 return -1;
 948         }
 949
 950         Data &= ~0x80;
 951         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 952         if (status < 0) {
 953                 dev_dbg(&port->dev, "writing Spreg failed\n");
 954                 return -1;
 955         }
 956         /* End of block to be checked */
 957
 958         Data = 0x0;
 959         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 960                                                                         &Data);
 961         if (status < 0) {
 962                 dev_dbg(&port->dev, "Reading Controlreg failed\n");
 963                 return -1;
 964         }
 965         Data |= 0x08;           /* Driver done bit */
 966         Data |= 0x20;           /* rx_disable */
 967         status = mos7840_set_reg_sync(port,
 968                                 mos7840_port->ControlRegOffset, Data);
 969         if (status < 0) {
 970                 dev_dbg(&port->dev, "writing Controlreg failed\n");
 971                 return -1;
 972         }
 973         /* do register settings here */
 974         /* Set all regs to the device default values. */
 975         /***********************************
 976          * First Disable all interrupts.
 977          ***********************************/
 978         Data = 0x00;
 979         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 980         if (status < 0) {
 981                 dev_dbg(&port->dev, "disabling interrupts failed\n");
 982                 return -1;
 983         }
 984         /* Set FIFO_CONTROL_REGISTER to the default value */
 985         Data = 0x00;
 986         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 987         if (status < 0) {
 988                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
 989                 return -1;
 990         }
 991
 992         Data = 0xcf;
 993         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 994         if (status < 0) {
 995                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
 996                 return -1;
 997         }
 998
 999         Data = 0x03;
1000         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1001         mos7840_port->shadowLCR = Data;
1002
1003         Data = 0x0b;
1004         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1005         mos7840_port->shadowMCR = Data;
1006
1007         Data = 0x00;
1008         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1009         mos7840_port->shadowLCR = Data;
1010
1011         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1012         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1013
1014         Data = 0x0c;
1015         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1016
1017         Data = 0x0;
1018         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1019
1020         Data = 0x00;
1021         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1022
1023         Data = Data & ~SERIAL_LCR_DLAB;
1024         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1025         mos7840_port->shadowLCR = Data;
1026
1027         /* clearing Bulkin and Bulkout Fifo */
1028         Data = 0x0;
1029         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1030
1031         Data = Data | 0x0c;
1032         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1033
1034         Data = Data & ~0x0c;
1035         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1036         /* Finally enable all interrupts */
1037         Data = 0x0c;
1038         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1039
1040         /* clearing rx_disable */
1041         Data = 0x0;
1042         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1043                                                                         &Data);
1044         Data = Data & ~0x20;
1045         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1046                                                                         Data);
1047
1048         /* rx_negate */
1049         Data = 0x0;
1050         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1051                                                                         &Data);
1052         Data = Data | 0x10;
1053         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1054                                                                         Data);
1055
1056         /* Check to see if we've set up our endpoint info yet    *
1057          * (can't set it up in mos7840_startup as the structures *
1058          * were not set up at that time.)                        */
1059         if (port0->open_ports == 1) {
1060                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1061                         /* set up interrupt urb */
1062                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1063                                 serial->dev,
1064                                 usb_rcvintpipe(serial->dev,
1065                                 serial->port[0]->interrupt_in_endpointAddress),
1066                                 serial->port[0]->interrupt_in_buffer,
1067                                 serial->port[0]->interrupt_in_urb->
1068                                 transfer_buffer_length,
1069                                 mos7840_interrupt_callback,
1070                                 serial,
1071                                 serial->port[0]->interrupt_in_urb->interval);
1072
1073                         /* start interrupt read for mos7840               *
1074                          * will continue as long as mos7840 is connected  */
1075
1076                         response =
1077                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1078                                            GFP_KERNEL);
1079                         if (response) {
1080                                 dev_err(&port->dev, "%s - Error %d submitting "
1081                                         "interrupt urb\n", __func__, response);
1082                         }
1083
1084                 }
1085
1086         }
1087
1088         /* see if we've set up our endpoint info yet   *
1089          * (can't set it up in mos7840_startup as the  *
1090          * structures were not set up at that time.)   */
1091
1092         dev_dbg(&port->dev, "port number is %d\n", port->number);
1093         dev_dbg(&port->dev, "serial number is %d\n", port->serial->minor);
1094         dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
1095         dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
1096         dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
1097         dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
1098         mos7840_port->read_urb = port->read_urb;
1099
1100         /* set up our bulk in urb */
1101         if ((serial->num_ports == 2)
1102                 && ((((__u16)port->number -
1103                         (__u16)(port->serial->minor)) % 2) != 0)) {
1104                 usb_fill_bulk_urb(mos7840_port->read_urb,
1105                         serial->dev,
1106                         usb_rcvbulkpipe(serial->dev,
1107                                 (port->bulk_in_endpointAddress) + 2),
1108                         port->bulk_in_buffer,
1109                         mos7840_port->read_urb->transfer_buffer_length,
1110                         mos7840_bulk_in_callback, mos7840_port);
1111         } else {
1112                 usb_fill_bulk_urb(mos7840_port->read_urb,
1113                         serial->dev,
1114                         usb_rcvbulkpipe(serial->dev,
1115                                 port->bulk_in_endpointAddress),
1116                         port->bulk_in_buffer,
1117                         mos7840_port->read_urb->transfer_buffer_length,
1118                         mos7840_bulk_in_callback, mos7840_port);
1119         }
1120
1121         dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
1122         mos7840_port->read_urb_busy = true;
1123         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1124         if (response) {
1125                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1126                         __func__, response);
1127                 mos7840_port->read_urb_busy = false;
1128         }
1129
1130         /* initialize our wait queues */
1131         init_waitqueue_head(&mos7840_port->wait_chase);
1132
1133         /* initialize our icount structure */
1134         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1135
1136         /* initialize our port settings */
1137         /* Must set to enable ints! */
1138         mos7840_port->shadowMCR = MCR_MASTER_IE;
1139         /* send a open port command */
1140         mos7840_port->open = 1;
1141         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1142         mos7840_port->icount.tx = 0;
1143         mos7840_port->icount.rx = 0;
1144
1145         return 0;
1146 }
1147
1148 /*****************************************************************************
1149  * mos7840_chars_in_buffer
1150  *      this function is called by the tty driver when it wants to know how many
1151  *      bytes of data we currently have outstanding in the port (data that has
1152  *      been written, but hasn't made it out the port yet)
1153  *      If successful, we return the number of bytes left to be written in the
1154  *      system,
1155  *      Otherwise we return zero.
1156  *****************************************************************************/
1157
1158 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1159 {
1160         struct usb_serial_port *port = tty->driver_data;
1161         int i;
1162         int chars = 0;
1163         unsigned long flags;
1164         struct moschip_port *mos7840_port;
1165
1166         if (mos7840_port_paranoia_check(port, __func__))
1167                 return 0;
1168
1169         mos7840_port = mos7840_get_port_private(port);
1170         if (mos7840_port == NULL)
1171                 return 0;
1172
1173         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1174         for (i = 0; i < NUM_URBS; ++i) {
1175                 if (mos7840_port->busy[i]) {
1176                         struct urb *urb = mos7840_port->write_urb_pool[i];
1177                         chars += urb->transfer_buffer_length;
1178                 }
1179         }
1180         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1181         dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1182         return chars;
1183
1184 }
1185
1186 /*****************************************************************************
1187  * mos7840_close
1188  *      this function is called by the tty driver when a port is closed
1189  *****************************************************************************/
1190
1191 static void mos7840_close(struct usb_serial_port *port)
1192 {
1193         struct usb_serial *serial;
1194         struct moschip_port *mos7840_port;
1195         struct moschip_port *port0;
1196         int j;
1197         __u16 Data;
1198
1199         if (mos7840_port_paranoia_check(port, __func__))
1200                 return;
1201
1202         serial = mos7840_get_usb_serial(port, __func__);
1203         if (!serial)
1204                 return;
1205
1206         mos7840_port = mos7840_get_port_private(port);
1207         port0 = mos7840_get_port_private(serial->port[0]);
1208
1209         if (mos7840_port == NULL || port0 == NULL)
1210                 return;
1211
1212         for (j = 0; j < NUM_URBS; ++j)
1213                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1214
1215         /* Freeing Write URBs */
1216         for (j = 0; j < NUM_URBS; ++j) {
1217                 if (mos7840_port->write_urb_pool[j]) {
1218                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1219                                 kfree(mos7840_port->write_urb_pool[j]->
1220                                       transfer_buffer);
1221
1222                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1223                 }
1224         }
1225
1226         /* While closing port, shutdown all bulk read, write  *
1227          * and interrupt read if they exists                  */
1228         if (serial->dev) {
1229                 if (mos7840_port->write_urb) {
1230                         dev_dbg(&port->dev, "%s", "Shutdown bulk write\n");
1231                         usb_kill_urb(mos7840_port->write_urb);
1232                 }
1233                 if (mos7840_port->read_urb) {
1234                         dev_dbg(&port->dev, "%s", "Shutdown bulk read\n");
1235                         usb_kill_urb(mos7840_port->read_urb);
1236                         mos7840_port->read_urb_busy = false;
1237                 }
1238                 if ((&mos7840_port->control_urb)) {
1239                         dev_dbg(&port->dev, "%s", "Shutdown control read\n");
1240                         /*/      usb_kill_urb (mos7840_port->control_urb); */
1241                 }
1242         }
1243 /*      if(mos7840_port->ctrl_buf != NULL) */
1244 /*              kfree(mos7840_port->ctrl_buf); */
1245         port0->open_ports--;
1246         dev_dbg(&port->dev, "%s in close%d:in port%d\n", __func__, port0->open_ports, port->number);
1247         if (port0->open_ports == 0) {
1248                 if (serial->port[0]->interrupt_in_urb) {
1249                         dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n");
1250                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1251                 }
1252         }
1253
1254         if (mos7840_port->write_urb) {
1255                 /* if this urb had a transfer buffer already (old tx) free it */
1256                 if (mos7840_port->write_urb->transfer_buffer != NULL)
1257                         kfree(mos7840_port->write_urb->transfer_buffer);
1258                 usb_free_urb(mos7840_port->write_urb);
1259         }
1260
1261         Data = 0x0;
1262         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1263
1264         Data = 0x00;
1265         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1266
1267         mos7840_port->open = 0;
1268 }
1269
1270 /************************************************************************
1271  *
1272  * mos7840_block_until_chase_response
1273  *
1274  *      This function will block the close until one of the following:
1275  *              1. Response to our Chase comes from mos7840
1276  *              2. A timeout of 10 seconds without activity has expired
1277  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1278  *
1279  ************************************************************************/
1280
1281 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1282                                         struct moschip_port *mos7840_port)
1283 {
1284         int timeout = msecs_to_jiffies(1000);
1285         int wait = 10;
1286         int count;
1287
1288         while (1) {
1289                 count = mos7840_chars_in_buffer(tty);
1290
1291                 /* Check for Buffer status */
1292                 if (count <= 0)
1293                         return;
1294
1295                 /* Block the thread for a while */
1296                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1297                                                timeout);
1298                 /* No activity.. count down section */
1299                 wait--;
1300                 if (wait == 0) {
1301                         dev_dbg(&mos7840_port->port->dev, "%s - TIMEOUT\n", __func__);
1302                         return;
1303                 } else {
1304                         /* Reset timeout value back to seconds */
1305                         wait = 10;
1306                 }
1307         }
1308
1309 }
1310
1311 /*****************************************************************************
1312  * mos7840_break
1313  *      this function sends a break to the port
1314  *****************************************************************************/
1315 static void mos7840_break(struct tty_struct *tty, int break_state)
1316 {
1317         struct usb_serial_port *port = tty->driver_data;
1318         unsigned char data;
1319         struct usb_serial *serial;
1320         struct moschip_port *mos7840_port;
1321
1322         if (mos7840_port_paranoia_check(port, __func__))
1323                 return;
1324
1325         serial = mos7840_get_usb_serial(port, __func__);
1326         if (!serial)
1327                 return;
1328
1329         mos7840_port = mos7840_get_port_private(port);
1330
1331         if (mos7840_port == NULL)
1332                 return;
1333
1334         if (serial->dev)
1335                 /* flush and block until tx is empty */
1336                 mos7840_block_until_chase_response(tty, mos7840_port);
1337
1338         if (break_state == -1)
1339                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1340         else
1341                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1342
1343         /* FIXME: no locking on shadowLCR anywhere in driver */
1344         mos7840_port->shadowLCR = data;
1345         dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1346         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1347                              mos7840_port->shadowLCR);
1348 }
1349
1350 /*****************************************************************************
1351  * mos7840_write_room
1352  *      this function is called by the tty driver when it wants to know how many
1353  *      bytes of data we can accept for a specific port.
1354  *      If successful, we return the amount of room that we have for this port
1355  *      Otherwise we return a negative error number.
1356  *****************************************************************************/
1357
1358 static int mos7840_write_room(struct tty_struct *tty)
1359 {
1360         struct usb_serial_port *port = tty->driver_data;
1361         int i;
1362         int room = 0;
1363         unsigned long flags;
1364         struct moschip_port *mos7840_port;
1365
1366         if (mos7840_port_paranoia_check(port, __func__))
1367                 return -1;
1368
1369         mos7840_port = mos7840_get_port_private(port);
1370         if (mos7840_port == NULL)
1371                 return -1;
1372
1373         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1374         for (i = 0; i < NUM_URBS; ++i) {
1375                 if (!mos7840_port->busy[i])
1376                         room += URB_TRANSFER_BUFFER_SIZE;
1377         }
1378         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1379
1380         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1381         dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room);
1382         return room;
1383
1384 }
1385
1386 /*****************************************************************************
1387  * mos7840_write
1388  *      this function is called by the tty driver when data should be written to
1389  *      the port.
1390  *      If successful, we return the number of bytes written, otherwise we
1391  *      return a negative error number.
1392  *****************************************************************************/
1393
1394 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1395                          const unsigned char *data, int count)
1396 {
1397         int status;
1398         int i;
1399         int bytes_sent = 0;
1400         int transfer_size;
1401         unsigned long flags;
1402
1403         struct moschip_port *mos7840_port;
1404         struct usb_serial *serial;
1405         struct urb *urb;
1406         /* __u16 Data; */
1407         const unsigned char *current_position = data;
1408         unsigned char *data1;
1409
1410 #ifdef NOTMOS7840
1411         Data = 0x00;
1412         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1413         mos7840_port->shadowLCR = Data;
1414         dev_dbg(&port->dev, "%s: LINE_CONTROL_REGISTER is %x\n", __func__, Data);
1415         dev_dbg(&port->dev, "%s: mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1416
1417         /* Data = 0x03; */
1418         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1419         /* mos7840_port->shadowLCR=Data;//Need to add later */
1420
1421         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1422         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1423
1424         /* Data = 0x0c; */
1425         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1426         Data = 0x00;
1427         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1428         dev_dbg(&port->dev, "%s: DLL value is %x\n", __func__, Data);
1429
1430         Data = 0x0;
1431         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1432         dev_dbg(&port->dev, "%s: DLM value is %x\n", __func__, Data);
1433
1434         Data = Data & ~SERIAL_LCR_DLAB;
1435         dev_dbg(&port->dev, "%s: mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1436         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1437 #endif
1438
1439         if (mos7840_port_paranoia_check(port, __func__))
1440                 return -1;
1441
1442         serial = port->serial;
1443         if (mos7840_serial_paranoia_check(serial, __func__))
1444                 return -1;
1445
1446         mos7840_port = mos7840_get_port_private(port);
1447         if (mos7840_port == NULL)
1448                 return -1;
1449
1450         /* try to find a free urb in the list */
1451         urb = NULL;
1452
1453         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1454         for (i = 0; i < NUM_URBS; ++i) {
1455                 if (!mos7840_port->busy[i]) {
1456                         mos7840_port->busy[i] = 1;
1457                         urb = mos7840_port->write_urb_pool[i];
1458                         dev_dbg(&port->dev, "URB:%d\n", i);
1459                         break;
1460                 }
1461         }
1462         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1463
1464         if (urb == NULL) {
1465                 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1466                 goto exit;
1467         }
1468
1469         if (urb->transfer_buffer == NULL) {
1470                 urb->transfer_buffer =
1471                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1472
1473                 if (urb->transfer_buffer == NULL) {
1474                         dev_err_console(port, "%s no more kernel memory...\n",
1475                                 __func__);
1476                         goto exit;
1477                 }
1478         }
1479         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1480
1481         memcpy(urb->transfer_buffer, current_position, transfer_size);
1482
1483         /* fill urb with data and submit  */
1484         if ((serial->num_ports == 2)
1485                 && ((((__u16)port->number -
1486                         (__u16)(port->serial->minor)) % 2) != 0)) {
1487                 usb_fill_bulk_urb(urb,
1488                         serial->dev,
1489                         usb_sndbulkpipe(serial->dev,
1490                                 (port->bulk_out_endpointAddress) + 2),
1491                         urb->transfer_buffer,
1492                         transfer_size,
1493                         mos7840_bulk_out_data_callback, mos7840_port);
1494         } else {
1495                 usb_fill_bulk_urb(urb,
1496                         serial->dev,
1497                         usb_sndbulkpipe(serial->dev,
1498                                 port->bulk_out_endpointAddress),
1499                         urb->transfer_buffer,
1500                         transfer_size,
1501                         mos7840_bulk_out_data_callback, mos7840_port);
1502         }
1503
1504         data1 = urb->transfer_buffer;
1505         dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
1506
1507         /* Turn on LED */
1508         if (mos7840_port->has_led && !mos7840_port->led_flag) {
1509                 mos7840_port->led_flag = true;
1510                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0301);
1511                 mod_timer(&mos7840_port->led_timer1,
1512                                 jiffies + msecs_to_jiffies(LED_ON_MS));
1513         }
1514
1515         /* send it down the pipe */
1516         status = usb_submit_urb(urb, GFP_ATOMIC);
1517
1518         if (status) {
1519                 mos7840_port->busy[i] = 0;
1520                 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1521                         "with status = %d\n", __func__, status);
1522                 bytes_sent = status;
1523                 goto exit;
1524         }
1525         bytes_sent = transfer_size;
1526         mos7840_port->icount.tx += transfer_size;
1527         smp_wmb();
1528         dev_dbg(&port->dev, "mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx);
1529 exit:
1530         return bytes_sent;
1531
1532 }
1533
1534 /*****************************************************************************
1535  * mos7840_throttle
1536  *      this function is called by the tty driver when it wants to stop the data
1537  *      being read from the port.
1538  *****************************************************************************/
1539
1540 static void mos7840_throttle(struct tty_struct *tty)
1541 {
1542         struct usb_serial_port *port = tty->driver_data;
1543         struct moschip_port *mos7840_port;
1544         int status;
1545
1546         if (mos7840_port_paranoia_check(port, __func__))
1547                 return;
1548
1549         mos7840_port = mos7840_get_port_private(port);
1550
1551         if (mos7840_port == NULL)
1552                 return;
1553
1554         if (!mos7840_port->open) {
1555                 dev_dbg(&port->dev, "%s", "port not opened\n");
1556                 return;
1557         }
1558
1559         /* if we are implementing XON/XOFF, send the stop character */
1560         if (I_IXOFF(tty)) {
1561                 unsigned char stop_char = STOP_CHAR(tty);
1562                 status = mos7840_write(tty, port, &stop_char, 1);
1563                 if (status <= 0)
1564                         return;
1565         }
1566         /* if we are implementing RTS/CTS, toggle that line */
1567         if (tty->termios.c_cflag & CRTSCTS) {
1568                 mos7840_port->shadowMCR &= ~MCR_RTS;
1569                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1570                                          mos7840_port->shadowMCR);
1571                 if (status < 0)
1572                         return;
1573         }
1574 }
1575
1576 /*****************************************************************************
1577  * mos7840_unthrottle
1578  *      this function is called by the tty driver when it wants to resume
1579  *      the data being read from the port (called after mos7840_throttle is
1580  *      called)
1581  *****************************************************************************/
1582 static void mos7840_unthrottle(struct tty_struct *tty)
1583 {
1584         struct usb_serial_port *port = tty->driver_data;
1585         int status;
1586         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1587
1588         if (mos7840_port_paranoia_check(port, __func__))
1589                 return;
1590
1591         if (mos7840_port == NULL)
1592                 return;
1593
1594         if (!mos7840_port->open) {
1595                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1596                 return;
1597         }
1598
1599         /* if we are implementing XON/XOFF, send the start character */
1600         if (I_IXOFF(tty)) {
1601                 unsigned char start_char = START_CHAR(tty);
1602                 status = mos7840_write(tty, port, &start_char, 1);
1603                 if (status <= 0)
1604                         return;
1605         }
1606
1607         /* if we are implementing RTS/CTS, toggle that line */
1608         if (tty->termios.c_cflag & CRTSCTS) {
1609                 mos7840_port->shadowMCR |= MCR_RTS;
1610                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1611                                          mos7840_port->shadowMCR);
1612                 if (status < 0)
1613                         return;
1614         }
1615 }
1616
1617 static int mos7840_tiocmget(struct tty_struct *tty)
1618 {
1619         struct usb_serial_port *port = tty->driver_data;
1620         struct moschip_port *mos7840_port;
1621         unsigned int result;
1622         __u16 msr;
1623         __u16 mcr;
1624         int status;
1625         mos7840_port = mos7840_get_port_private(port);
1626
1627         if (mos7840_port == NULL)
1628                 return -ENODEV;
1629
1630         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1631         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1632         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1633             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1634             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1635             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1636             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1637             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1638             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1639
1640         dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1641
1642         return result;
1643 }
1644
1645 static int mos7840_tiocmset(struct tty_struct *tty,
1646                             unsigned int set, unsigned int clear)
1647 {
1648         struct usb_serial_port *port = tty->driver_data;
1649         struct moschip_port *mos7840_port;
1650         unsigned int mcr;
1651         int status;
1652
1653         mos7840_port = mos7840_get_port_private(port);
1654
1655         if (mos7840_port == NULL)
1656                 return -ENODEV;
1657
1658         /* FIXME: What locks the port registers ? */
1659         mcr = mos7840_port->shadowMCR;
1660         if (clear & TIOCM_RTS)
1661                 mcr &= ~MCR_RTS;
1662         if (clear & TIOCM_DTR)
1663                 mcr &= ~MCR_DTR;
1664         if (clear & TIOCM_LOOP)
1665                 mcr &= ~MCR_LOOPBACK;
1666
1667         if (set & TIOCM_RTS)
1668                 mcr |= MCR_RTS;
1669         if (set & TIOCM_DTR)
1670                 mcr |= MCR_DTR;
1671         if (set & TIOCM_LOOP)
1672                 mcr |= MCR_LOOPBACK;
1673
1674         mos7840_port->shadowMCR = mcr;
1675
1676         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1677         if (status < 0) {
1678                 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1679                 return status;
1680         }
1681
1682         return 0;
1683 }
1684
1685 /*****************************************************************************
1686  * mos7840_calc_baud_rate_divisor
1687  *      this function calculates the proper baud rate divisor for the specified
1688  *      baud rate.
1689  *****************************************************************************/
1690 static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1691                                           int baudRate, int *divisor,
1692                                           __u16 *clk_sel_val)
1693 {
1694         dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1695
1696         if (baudRate <= 115200) {
1697                 *divisor = 115200 / baudRate;
1698                 *clk_sel_val = 0x0;
1699         }
1700         if ((baudRate > 115200) && (baudRate <= 230400)) {
1701                 *divisor = 230400 / baudRate;
1702                 *clk_sel_val = 0x10;
1703         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1704                 *divisor = 403200 / baudRate;
1705                 *clk_sel_val = 0x20;
1706         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1707                 *divisor = 460800 / baudRate;
1708                 *clk_sel_val = 0x30;
1709         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1710                 *divisor = 806400 / baudRate;
1711                 *clk_sel_val = 0x40;
1712         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1713                 *divisor = 921600 / baudRate;
1714                 *clk_sel_val = 0x50;
1715         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1716                 *divisor = 1572864 / baudRate;
1717                 *clk_sel_val = 0x60;
1718         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1719                 *divisor = 3145728 / baudRate;
1720                 *clk_sel_val = 0x70;
1721         }
1722         return 0;
1723
1724 #ifdef NOTMCS7840
1725
1726         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1727                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1728                         *divisor = mos7840_divisor_table[i].Divisor;
1729                         return 0;
1730                 }
1731         }
1732
1733         /* After trying for all the standard baud rates    *
1734          * Try calculating the divisor for this baud rate  */
1735
1736         if (baudrate > 75 && baudrate < 230400) {
1737                 /* get the divisor */
1738                 custom = (__u16) (230400L / baudrate);
1739
1740                 /* Check for round off */
1741                 round1 = (__u16) (2304000L / baudrate);
1742                 round = (__u16) (round1 - (custom * 10));
1743                 if (round > 4)
1744                         custom++;
1745                 *divisor = custom;
1746
1747                 dev_dbg(&port->dev, " Baud %d = %d\n", baudrate, custom);
1748                 return 0;
1749         }
1750
1751         dev_dbg(&port->dev, "%s", " Baud calculation Failed...\n");
1752         return -1;
1753 #endif
1754 }
1755
1756 /*****************************************************************************
1757  * mos7840_send_cmd_write_baud_rate
1758  *      this function sends the proper command to change the baud rate of the
1759  *      specified port.
1760  *****************************************************************************/
1761
1762 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1763                                             int baudRate)
1764 {
1765         int divisor = 0;
1766         int status;
1767         __u16 Data;
1768         unsigned char number;
1769         __u16 clk_sel_val;
1770         struct usb_serial_port *port;
1771
1772         if (mos7840_port == NULL)
1773                 return -1;
1774
1775         port = mos7840_port->port;
1776         if (mos7840_port_paranoia_check(port, __func__))
1777                 return -1;
1778
1779         if (mos7840_serial_paranoia_check(port->serial, __func__))
1780                 return -1;
1781
1782         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1783
1784         dev_dbg(&port->dev, "%s - port = %d, baud = %d\n", __func__,
1785                 mos7840_port->port->number, baudRate);
1786         /* reset clk_uart_sel in spregOffset */
1787         if (baudRate > 115200) {
1788 #ifdef HW_flow_control
1789                 /* NOTE: need to see the pther register to modify */
1790                 /* setting h/w flow control bit to 1 */
1791                 Data = 0x2b;
1792                 mos7840_port->shadowMCR = Data;
1793                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1794                                                                         Data);
1795                 if (status < 0) {
1796                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1797                         return -1;
1798                 }
1799 #endif
1800
1801         } else {
1802 #ifdef HW_flow_control
1803                 /* setting h/w flow control bit to 0 */
1804                 Data = 0xb;
1805                 mos7840_port->shadowMCR = Data;
1806                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1807                                                                         Data);
1808                 if (status < 0) {
1809                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1810                         return -1;
1811                 }
1812 #endif
1813
1814         }
1815
1816         if (1) {                /* baudRate <= 115200) */
1817                 clk_sel_val = 0x0;
1818                 Data = 0x0;
1819                 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1820                                                    &clk_sel_val);
1821                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1822                                                                  &Data);
1823                 if (status < 0) {
1824                         dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1825                         return -1;
1826                 }
1827                 Data = (Data & 0x8f) | clk_sel_val;
1828                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1829                                                                 Data);
1830                 if (status < 0) {
1831                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1832                         return -1;
1833                 }
1834                 /* Calculate the Divisor */
1835
1836                 if (status) {
1837                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1838                         return status;
1839                 }
1840                 /* Enable access to divisor latch */
1841                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1842                 mos7840_port->shadowLCR = Data;
1843                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1844
1845                 /* Write the divisor */
1846                 Data = (unsigned char)(divisor & 0xff);
1847                 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1848                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1849
1850                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1851                 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1852                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1853
1854                 /* Disable access to divisor latch */
1855                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1856                 mos7840_port->shadowLCR = Data;
1857                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1858
1859         }
1860         return status;
1861 }
1862
1863 /*****************************************************************************
1864  * mos7840_change_port_settings
1865  *      This routine is called to set the UART on the device to match
1866  *      the specified new settings.
1867  *****************************************************************************/
1868
1869 static void mos7840_change_port_settings(struct tty_struct *tty,
1870         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1871 {
1872         int baud;
1873         unsigned cflag;
1874         unsigned iflag;
1875         __u8 lData;
1876         __u8 lParity;
1877         __u8 lStop;
1878         int status;
1879         __u16 Data;
1880         struct usb_serial_port *port;
1881         struct usb_serial *serial;
1882
1883         if (mos7840_port == NULL)
1884                 return;
1885
1886         port = mos7840_port->port;
1887
1888         if (mos7840_port_paranoia_check(port, __func__))
1889                 return;
1890
1891         if (mos7840_serial_paranoia_check(port->serial, __func__))
1892                 return;
1893
1894         serial = port->serial;
1895
1896         if (!mos7840_port->open) {
1897                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1898                 return;
1899         }
1900
1901         lData = LCR_BITS_8;
1902         lStop = LCR_STOP_1;
1903         lParity = LCR_PAR_NONE;
1904
1905         cflag = tty->termios.c_cflag;
1906         iflag = tty->termios.c_iflag;
1907
1908         /* Change the number of bits */
1909         if (cflag & CSIZE) {
1910                 switch (cflag & CSIZE) {
1911                 case CS5:
1912                         lData = LCR_BITS_5;
1913                         break;
1914
1915                 case CS6:
1916                         lData = LCR_BITS_6;
1917                         break;
1918
1919                 case CS7:
1920                         lData = LCR_BITS_7;
1921                         break;
1922                 default:
1923                 case CS8:
1924                         lData = LCR_BITS_8;
1925                         break;
1926                 }
1927         }
1928         /* Change the Parity bit */
1929         if (cflag & PARENB) {
1930                 if (cflag & PARODD) {
1931                         lParity = LCR_PAR_ODD;
1932                         dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1933                 } else {
1934                         lParity = LCR_PAR_EVEN;
1935                         dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1936                 }
1937
1938         } else {
1939                 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1940         }
1941
1942         if (cflag & CMSPAR)
1943                 lParity = lParity | 0x20;
1944
1945         /* Change the Stop bit */
1946         if (cflag & CSTOPB) {
1947                 lStop = LCR_STOP_2;
1948                 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1949         } else {
1950                 lStop = LCR_STOP_1;
1951                 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1952         }
1953
1954         /* Update the LCR with the correct value */
1955         mos7840_port->shadowLCR &=
1956             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1957         mos7840_port->shadowLCR |= (lData | lParity | lStop);
1958
1959         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1960                 mos7840_port->shadowLCR);
1961         /* Disable Interrupts */
1962         Data = 0x00;
1963         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1964
1965         Data = 0x00;
1966         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1967
1968         Data = 0xcf;
1969         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1970
1971         /* Send the updated LCR value to the mos7840 */
1972         Data = mos7840_port->shadowLCR;
1973
1974         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1975
1976         Data = 0x00b;
1977         mos7840_port->shadowMCR = Data;
1978         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1979         Data = 0x00b;
1980         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1981
1982         /* set up the MCR register and send it to the mos7840 */
1983
1984         mos7840_port->shadowMCR = MCR_MASTER_IE;
1985         if (cflag & CBAUD)
1986                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1987
1988         if (cflag & CRTSCTS)
1989                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1990         else
1991                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1992
1993         Data = mos7840_port->shadowMCR;
1994         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1995
1996         /* Determine divisor based on baud rate */
1997         baud = tty_get_baud_rate(tty);
1998
1999         if (!baud) {
2000                 /* pick a default, any default... */
2001                 dev_dbg(&port->dev, "%s", "Picked default baud...\n");
2002                 baud = 9600;
2003         }
2004
2005         dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
2006         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2007
2008         /* Enable Interrupts */
2009         Data = 0x0c;
2010         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2011
2012         if (mos7840_port->read_urb_busy == false) {
2013                 mos7840_port->read_urb_busy = true;
2014                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2015                 if (status) {
2016                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
2017                             status);
2018                         mos7840_port->read_urb_busy = false;
2019                 }
2020         }
2021         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
2022                 mos7840_port->shadowLCR);
2023 }
2024
2025 /*****************************************************************************
2026  * mos7840_set_termios
2027  *      this function is called by the tty driver when it wants to change
2028  *      the termios structure
2029  *****************************************************************************/
2030
2031 static void mos7840_set_termios(struct tty_struct *tty,
2032                                 struct usb_serial_port *port,
2033                                 struct ktermios *old_termios)
2034 {
2035         int status;
2036         unsigned int cflag;
2037         struct usb_serial *serial;
2038         struct moschip_port *mos7840_port;
2039
2040         if (mos7840_port_paranoia_check(port, __func__))
2041                 return;
2042
2043         serial = port->serial;
2044
2045         if (mos7840_serial_paranoia_check(serial, __func__))
2046                 return;
2047
2048         mos7840_port = mos7840_get_port_private(port);
2049
2050         if (mos7840_port == NULL)
2051                 return;
2052
2053         if (!mos7840_port->open) {
2054                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
2055                 return;
2056         }
2057
2058         dev_dbg(&port->dev, "%s", "setting termios - \n");
2059
2060         cflag = tty->termios.c_cflag;
2061
2062         dev_dbg(&port->dev, "%s - clfag %08x iflag %08x\n", __func__,
2063                 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
2064         dev_dbg(&port->dev, "%s - old clfag %08x old iflag %08x\n", __func__,
2065                 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2066         dev_dbg(&port->dev, "%s - port %d\n", __func__, port->number);
2067
2068         /* change the port settings to the new ones specified */
2069
2070         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2071
2072         if (!mos7840_port->read_urb) {
2073                 dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n");
2074                 return;
2075         }
2076
2077         if (mos7840_port->read_urb_busy == false) {
2078                 mos7840_port->read_urb_busy = true;
2079                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2080                 if (status) {
2081                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
2082                             status);
2083                         mos7840_port->read_urb_busy = false;
2084                 }
2085         }
2086 }
2087
2088 /*****************************************************************************
2089  * mos7840_get_lsr_info - get line status register info
2090  *
2091  * Purpose: Let user call ioctl() to get info when the UART physically
2092  *          is emptied.  On bus types like RS485, the transmitter must
2093  *          release the bus after transmitting. This must be done when
2094  *          the transmit shift register is empty, not be done when the
2095  *          transmit holding register is empty.  This functionality
2096  *          allows an RS485 driver to be written in user space.
2097  *****************************************************************************/
2098
2099 static int mos7840_get_lsr_info(struct tty_struct *tty,
2100                                 unsigned int __user *value)
2101 {
2102         int count;
2103         unsigned int result = 0;
2104
2105         count = mos7840_chars_in_buffer(tty);
2106         if (count == 0)
2107                 result = TIOCSER_TEMT;
2108
2109         if (copy_to_user(value, &result, sizeof(int)))
2110                 return -EFAULT;
2111         return 0;
2112 }
2113
2114 /*****************************************************************************
2115  * mos7840_get_serial_info
2116  *      function to get information about serial port
2117  *****************************************************************************/
2118
2119 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2120                                    struct serial_struct __user *retinfo)
2121 {
2122         struct serial_struct tmp;
2123
2124         if (mos7840_port == NULL)
2125                 return -1;
2126
2127         if (!retinfo)
2128                 return -EFAULT;
2129
2130         memset(&tmp, 0, sizeof(tmp));
2131
2132         tmp.type = PORT_16550A;
2133         tmp.line = mos7840_port->port->serial->minor;
2134         tmp.port = mos7840_port->port->number;
2135         tmp.irq = 0;
2136         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2137         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2138         tmp.baud_base = 9600;
2139         tmp.close_delay = 5 * HZ;
2140         tmp.closing_wait = 30 * HZ;
2141
2142         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2143                 return -EFAULT;
2144         return 0;
2145 }
2146
2147 static int mos7840_get_icount(struct tty_struct *tty,
2148                         struct serial_icounter_struct *icount)
2149 {
2150         struct usb_serial_port *port = tty->driver_data;
2151         struct moschip_port *mos7840_port;
2152         struct async_icount cnow;
2153
2154         mos7840_port = mos7840_get_port_private(port);
2155         cnow = mos7840_port->icount;
2156
2157         smp_rmb();
2158         icount->cts = cnow.cts;
2159         icount->dsr = cnow.dsr;
2160         icount->rng = cnow.rng;
2161         icount->dcd = cnow.dcd;
2162         icount->rx = cnow.rx;
2163         icount->tx = cnow.tx;
2164         icount->frame = cnow.frame;
2165         icount->overrun = cnow.overrun;
2166         icount->parity = cnow.parity;
2167         icount->brk = cnow.brk;
2168         icount->buf_overrun = cnow.buf_overrun;
2169
2170         dev_dbg(&port->dev, "%s TIOCGICOUNT RX=%d, TX=%d\n", __func__,
2171                 icount->rx, icount->tx);
2172         return 0;
2173 }
2174
2175 /*****************************************************************************
2176  * SerialIoctl
2177  *      this function handles any ioctl calls to the driver
2178  *****************************************************************************/
2179
2180 static int mos7840_ioctl(struct tty_struct *tty,
2181                          unsigned int cmd, unsigned long arg)
2182 {
2183         struct usb_serial_port *port = tty->driver_data;
2184         void __user *argp = (void __user *)arg;
2185         struct moschip_port *mos7840_port;
2186
2187         struct async_icount cnow;
2188         struct async_icount cprev;
2189
2190         if (mos7840_port_paranoia_check(port, __func__))
2191                 return -1;
2192
2193         mos7840_port = mos7840_get_port_private(port);
2194
2195         if (mos7840_port == NULL)
2196                 return -1;
2197
2198         dev_dbg(&port->dev, "%s - cmd = 0x%x\n", __func__, cmd);
2199
2200         switch (cmd) {
2201                 /* return number of bytes available */
2202
2203         case TIOCSERGETLSR:
2204                 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
2205                 return mos7840_get_lsr_info(tty, argp);
2206
2207         case TIOCGSERIAL:
2208                 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
2209                 return mos7840_get_serial_info(mos7840_port, argp);
2210
2211         case TIOCSSERIAL:
2212                 dev_dbg(&port->dev, "%s TIOCSSERIAL\n", __func__);
2213                 break;
2214
2215         case TIOCMIWAIT:
2216                 dev_dbg(&port->dev, "%s  TIOCMIWAIT\n", __func__);
2217                 cprev = mos7840_port->icount;
2218                 while (1) {
2219                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2220                         mos7840_port->delta_msr_cond = 0;
2221                         wait_event_interruptible(port->delta_msr_wait,
2222                                                  (port->serial->disconnected ||
2223                                                   mos7840_port->
2224                                                   delta_msr_cond == 1));
2225
2226                         /* see if a signal did it */
2227                         if (signal_pending(current))
2228                                 return -ERESTARTSYS;
2229
2230                         if (port->serial->disconnected)
2231                                 return -EIO;
2232
2233                         cnow = mos7840_port->icount;
2234                         smp_rmb();
2235                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2236                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2237                                 return -EIO;    /* no change => error */
2238                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2239                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2240                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2241                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2242                                 return 0;
2243                         }
2244                         cprev = cnow;
2245                 }
2246                 /* NOTREACHED */
2247                 break;
2248
2249         default:
2250                 break;
2251         }
2252         return -ENOIOCTLCMD;
2253 }
2254
2255 static int mos7810_check(struct usb_serial *serial)
2256 {
2257         int i, pass_count = 0;
2258         __u16 data = 0, mcr_data = 0;
2259         __u16 test_pattern = 0x55AA;
2260
2261         /* Store MCR setting */
2262         usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2263                 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
2264                 &mcr_data, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2265
2266         for (i = 0; i < 16; i++) {
2267                 /* Send the 1-bit test pattern out to MCS7810 test pin */
2268                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2269                         MCS_WRREQ, MCS_WR_RTYPE,
2270                         (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
2271                         MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
2272
2273                 /* Read the test pattern back */
2274                 usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2275                         MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &data,
2276                         VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2277
2278                 /* If this is a MCS7810 device, both test patterns must match */
2279                 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
2280                         break;
2281
2282                 pass_count++;
2283         }
2284
2285         /* Restore MCR setting */
2286         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
2287                 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
2288                 0, MOS_WDR_TIMEOUT);
2289
2290         if (pass_count == 16)
2291                 return 1;
2292
2293         return 0;
2294 }
2295
2296 static int mos7840_calc_num_ports(struct usb_serial *serial)
2297 {
2298         __u16 data = 0x00;
2299         int mos7840_num_ports;
2300
2301         usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2302                 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &data,
2303                 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2304
2305         if (serial->dev->descriptor.idProduct == MOSCHIP_DEVICE_ID_7810 ||
2306                 serial->dev->descriptor.idProduct == MOSCHIP_DEVICE_ID_7820) {
2307                 device_type = serial->dev->descriptor.idProduct;
2308         } else {
2309                 /* For a MCS7840 device GPIO0 must be set to 1 */
2310                 if ((data & 0x01) == 1)
2311                         device_type = MOSCHIP_DEVICE_ID_7840;
2312                 else if (mos7810_check(serial))
2313                         device_type = MOSCHIP_DEVICE_ID_7810;
2314                 else
2315                         device_type = MOSCHIP_DEVICE_ID_7820;
2316         }
2317
2318         mos7840_num_ports = (device_type >> 4) & 0x000F;
2319         serial->num_bulk_in = mos7840_num_ports;
2320         serial->num_bulk_out = mos7840_num_ports;
2321         serial->num_ports = mos7840_num_ports;
2322
2323         return mos7840_num_ports;
2324 }
2325
2326 static int mos7840_port_probe(struct usb_serial_port *port)
2327 {
2328         struct usb_serial *serial = port->serial;
2329         struct moschip_port *mos7840_port;
2330         int status;
2331         int pnum;
2332         __u16 Data;
2333
2334         /* we set up the pointers to the endpoints in the mos7840_open *
2335          * function, as the structures aren't created yet.             */
2336
2337         pnum = port->number - serial->minor;
2338
2339         dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
2340         mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2341         if (mos7840_port == NULL) {
2342                 dev_err(&port->dev, "%s - Out of memory\n", __func__);
2343                 return -ENOMEM;
2344         }
2345
2346         /* Initialize all port interrupt end point to port 0 int
2347          * endpoint. Our device has only one interrupt end point
2348          * common to all port */
2349
2350         mos7840_port->port = port;
2351         mos7840_set_port_private(port, mos7840_port);
2352         spin_lock_init(&mos7840_port->pool_lock);
2353
2354         /* minor is not initialised until later by
2355          * usb-serial.c:get_free_serial() and cannot therefore be used
2356          * to index device instances */
2357         mos7840_port->port_num = pnum + 1;
2358         dev_dbg(&port->dev, "port->number = %d\n", port->number);
2359         dev_dbg(&port->dev, "port->serial->minor = %d\n", port->serial->minor);
2360         dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
2361         dev_dbg(&port->dev, "serial->minor = %d\n", serial->minor);
2362
2363         if (mos7840_port->port_num == 1) {
2364                 mos7840_port->SpRegOffset = 0x0;
2365                 mos7840_port->ControlRegOffset = 0x1;
2366                 mos7840_port->DcrRegOffset = 0x4;
2367         } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 4)) {
2368                 mos7840_port->SpRegOffset = 0x8;
2369                 mos7840_port->ControlRegOffset = 0x9;
2370                 mos7840_port->DcrRegOffset = 0x16;
2371         } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 2)) {
2372                 mos7840_port->SpRegOffset = 0xa;
2373                 mos7840_port->ControlRegOffset = 0xb;
2374                 mos7840_port->DcrRegOffset = 0x19;
2375         } else if ((mos7840_port->port_num == 3) && (serial->num_ports == 4)) {
2376                 mos7840_port->SpRegOffset = 0xa;
2377                 mos7840_port->ControlRegOffset = 0xb;
2378                 mos7840_port->DcrRegOffset = 0x19;
2379         } else if ((mos7840_port->port_num == 4) && (serial->num_ports == 4)) {
2380                 mos7840_port->SpRegOffset = 0xc;
2381                 mos7840_port->ControlRegOffset = 0xd;
2382                 mos7840_port->DcrRegOffset = 0x1c;
2383         }
2384         mos7840_dump_serial_port(port, mos7840_port);
2385         mos7840_set_port_private(port, mos7840_port);
2386
2387         /* enable rx_disable bit in control register */
2388         status = mos7840_get_reg_sync(port,
2389                         mos7840_port->ControlRegOffset, &Data);
2390         if (status < 0) {
2391                 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
2392                 goto out;
2393         } else
2394                 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
2395         Data |= 0x08;   /* setting driver done bit */
2396         Data |= 0x04;   /* sp1_bit to have cts change reflect in
2397                            modem status reg */
2398
2399         /* Data |= 0x20; //rx_disable bit */
2400         status = mos7840_set_reg_sync(port,
2401                         mos7840_port->ControlRegOffset, Data);
2402         if (status < 0) {
2403                 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2404                 goto out;
2405         } else
2406                 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
2407
2408         /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2409            and 0x24 in DCR3 */
2410         Data = 0x01;
2411         status = mos7840_set_reg_sync(port,
2412                         (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2413         if (status < 0) {
2414                 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
2415                 goto out;
2416         } else
2417                 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
2418
2419         Data = 0x05;
2420         status = mos7840_set_reg_sync(port,
2421                         (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2422         if (status < 0) {
2423                 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
2424                 goto out;
2425         } else
2426                 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
2427
2428         Data = 0x24;
2429         status = mos7840_set_reg_sync(port,
2430                         (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2431         if (status < 0) {
2432                 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
2433                 goto out;
2434         } else
2435                 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
2436
2437         /* write values in clkstart0x0 and clkmulti 0x20 */
2438         Data = 0x0;
2439         status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
2440         if (status < 0) {
2441                 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2442                 goto out;
2443         } else
2444                 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2445
2446         Data = 0x20;
2447         status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
2448         if (status < 0) {
2449                 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
2450                 goto error;
2451         } else
2452                 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
2453
2454         /* write value 0x0 to scratchpad register */
2455         Data = 0x00;
2456         status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
2457         if (status < 0) {
2458                 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
2459                 goto out;
2460         } else
2461                 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
2462
2463         /* Zero Length flag register */
2464         if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
2465                 Data = 0xff;
2466                 status = mos7840_set_reg_sync(port,
2467                                 (__u16) (ZLP_REG1 +
2468                                         ((__u16)mos7840_port->port_num)), Data);
2469                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2470                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
2471                 if (status < 0) {
2472                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
2473                         goto out;
2474                 } else
2475                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
2476         } else {
2477                 Data = 0xff;
2478                 status = mos7840_set_reg_sync(port,
2479                                 (__u16) (ZLP_REG1 +
2480                                         ((__u16)mos7840_port->port_num) - 0x1), Data);
2481                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2482                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
2483                 if (status < 0) {
2484                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
2485                         goto out;
2486                 } else
2487                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
2488
2489         }
2490         mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2491         mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2492         mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2493                         GFP_KERNEL);
2494         if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2495                         !mos7840_port->dr) {
2496                 status = -ENOMEM;
2497                 goto error;
2498         }
2499
2500         mos7840_port->has_led = false;
2501
2502         /* Initialize LED timers */
2503         if (device_type == MOSCHIP_DEVICE_ID_7810) {
2504                 mos7840_port->has_led = true;
2505
2506                 init_timer(&mos7840_port->led_timer1);
2507                 mos7840_port->led_timer1.function = mos7840_led_off;
2508                 mos7840_port->led_timer1.expires =
2509                         jiffies + msecs_to_jiffies(LED_ON_MS);
2510                 mos7840_port->led_timer1.data = (unsigned long)mos7840_port;
2511
2512                 init_timer(&mos7840_port->led_timer2);
2513                 mos7840_port->led_timer2.function = mos7840_led_flag_off;
2514                 mos7840_port->led_timer2.expires =
2515                         jiffies + msecs_to_jiffies(LED_OFF_MS);
2516                 mos7840_port->led_timer2.data = (unsigned long)mos7840_port;
2517
2518                 mos7840_port->led_flag = false;
2519
2520                 /* Turn off LED */
2521                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2522         }
2523 out:
2524         if (pnum == serial->num_ports - 1) {
2525                 /* Zero Length flag enable */
2526                 Data = 0x0f;
2527                 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2528                 if (status < 0) {
2529                         dev_dbg(&port->dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
2530                         goto error;
2531                 } else
2532                         dev_dbg(&port->dev, "ZLP_REG5 Writing success status%d\n", status);
2533
2534                 /* setting configuration feature to one */
2535                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2536                                 0x03, 0x00, 0x01, 0x00, NULL, 0x00,
2537                                 MOS_WDR_TIMEOUT);
2538         }
2539         return 0;
2540 error:
2541         kfree(mos7840_port->dr);
2542         kfree(mos7840_port->ctrl_buf);
2543         usb_free_urb(mos7840_port->control_urb);
2544         kfree(mos7840_port);
2545
2546         return status;
2547 }
2548
2549 static int mos7840_port_remove(struct usb_serial_port *port)
2550 {
2551         struct moschip_port *mos7840_port;
2552
2553         mos7840_port = mos7840_get_port_private(port);
2554
2555         if (mos7840_port->has_led) {
2556                 /* Turn off LED */
2557                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2558
2559                 del_timer_sync(&mos7840_port->led_timer1);
2560                 del_timer_sync(&mos7840_port->led_timer2);
2561         }
2562         usb_kill_urb(mos7840_port->control_urb);
2563         usb_free_urb(mos7840_port->control_urb);
2564         kfree(mos7840_port->ctrl_buf);
2565         kfree(mos7840_port->dr);
2566         kfree(mos7840_port);
2567
2568         return 0;
2569 }
2570
2571 static struct usb_serial_driver moschip7840_4port_device = {
2572         .driver = {
2573                    .owner = THIS_MODULE,
2574                    .name = "mos7840",
2575                    },
2576         .description = DRIVER_DESC,
2577         .id_table = id_table,
2578         .num_ports = 4,
2579         .open = mos7840_open,
2580         .close = mos7840_close,
2581         .write = mos7840_write,
2582         .write_room = mos7840_write_room,
2583         .chars_in_buffer = mos7840_chars_in_buffer,
2584         .throttle = mos7840_throttle,
2585         .unthrottle = mos7840_unthrottle,
2586         .calc_num_ports = mos7840_calc_num_ports,
2587 #ifdef MCSSerialProbe
2588         .probe = mos7840_serial_probe,
2589 #endif
2590         .ioctl = mos7840_ioctl,
2591         .set_termios = mos7840_set_termios,
2592         .break_ctl = mos7840_break,
2593         .tiocmget = mos7840_tiocmget,
2594         .tiocmset = mos7840_tiocmset,
2595         .get_icount = mos7840_get_icount,
2596         .port_probe = mos7840_port_probe,
2597         .port_remove = mos7840_port_remove,
2598         .read_bulk_callback = mos7840_bulk_in_callback,
2599         .read_int_callback = mos7840_interrupt_callback,
2600 };
2601
2602 static struct usb_serial_driver * const serial_drivers[] = {
2603         &moschip7840_4port_device, NULL
2604 };
2605
2606 module_usb_serial_driver(serial_drivers, id_table);
2607
2608 MODULE_DESCRIPTION(DRIVER_DESC);
2609 MODULE_LICENSE("GPL");