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         wait_queue_head_t delta_msr_wait;       /* for handling sleeping while waiting for msr change to happen */
 223         int delta_msr_cond;
 224         struct async_icount icount;
 225         struct usb_serial_port *port;   /* loop back to the owner of this object */
 226
 227         /* Offsets */
 228         __u8 SpRegOffset;
 229         __u8 ControlRegOffset;
 230         __u8 DcrRegOffset;
 231         /* for processing control URBS in interrupt context */
 232         struct urb *control_urb;
 233         struct usb_ctrlrequest *dr;
 234         char *ctrl_buf;
 235         int MsrLsr;
 236
 237         spinlock_t pool_lock;
 238         struct urb *write_urb_pool[NUM_URBS];
 239         char busy[NUM_URBS];
 240         bool read_urb_busy;
 241
 242         /* For device(s) with LED indicator */
 243         bool has_led;
 244         bool led_flag;
 245         struct timer_list led_timer1;   /* Timer for LED on */
 246         struct timer_list led_timer2;   /* Timer for LED off */
 247 };
 248
 249 /*
 250  * mos7840_set_reg_sync
 251  *      To set the Control register by calling usb_fill_control_urb function
 252  *      by passing usb_sndctrlpipe function as parameter.
 253  */
 254
 255 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 256                                 __u16 val)
 257 {
 258         struct usb_device *dev = port->serial->dev;
 259         val = val & 0x00ff;
 260         dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
 261
 262         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 263                                MCS_WR_RTYPE, val, reg, NULL, 0,
 264                                MOS_WDR_TIMEOUT);
 265 }
 266
 267 /*
 268  * mos7840_get_reg_sync
 269  *      To set the Uart register by calling usb_fill_control_urb function by
 270  *      passing usb_rcvctrlpipe function as parameter.
 271  */
 272
 273 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 274                                 __u16 *val)
 275 {
 276         struct usb_device *dev = port->serial->dev;
 277         int ret = 0;
 278         u8 *buf;
 279
 280         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 281         if (!buf)
 282                 return -ENOMEM;
 283
 284         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 285                               MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
 286                               MOS_WDR_TIMEOUT);
 287         *val = buf[0];
 288         dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
 289
 290         kfree(buf);
 291         return ret;
 292 }
 293
 294 /*
 295  * mos7840_set_uart_reg
 296  *      To set the Uart register by calling usb_fill_control_urb function by
 297  *      passing usb_sndctrlpipe function as parameter.
 298  */
 299
 300 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 301                                 __u16 val)
 302 {
 303
 304         struct usb_device *dev = port->serial->dev;
 305         val = val & 0x00ff;
 306         /* For the UART control registers, the application number need
 307            to be Or'ed */
 308         if (port->serial->num_ports == 4) {
 309                 val |= (((__u16) port->number -
 310                                 (__u16) (port->serial->minor)) + 1) << 8;
 311         } else {
 312                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 313                         val |= (((__u16) port->number -
 314                               (__u16) (port->serial->minor)) + 1) << 8;
 315                 } else {
 316                         val |= (((__u16) port->number -
 317                               (__u16) (port->serial->minor)) + 2) << 8;
 318                 }
 319         }
 320         dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
 321         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 322                                MCS_WR_RTYPE, val, reg, NULL, 0,
 323                                MOS_WDR_TIMEOUT);
 324
 325 }
 326
 327 /*
 328  * mos7840_get_uart_reg
 329  *      To set the Control register by calling usb_fill_control_urb function
 330  *      by passing usb_rcvctrlpipe function as parameter.
 331  */
 332 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 333                                 __u16 *val)
 334 {
 335         struct usb_device *dev = port->serial->dev;
 336         int ret = 0;
 337         __u16 Wval;
 338         u8 *buf;
 339
 340         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 341         if (!buf)
 342                 return -ENOMEM;
 343
 344         /* Wval  is same as application number */
 345         if (port->serial->num_ports == 4) {
 346                 Wval =
 347                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 348                      1) << 8;
 349         } else {
 350                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 351                         Wval = (((__u16) port->number -
 352                               (__u16) (port->serial->minor)) + 1) << 8;
 353                 } else {
 354                         Wval = (((__u16) port->number -
 355                               (__u16) (port->serial->minor)) + 2) << 8;
 356                 }
 357         }
 358         dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
 359         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 360                               MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
 361                               MOS_WDR_TIMEOUT);
 362         *val = buf[0];
 363
 364         kfree(buf);
 365         return ret;
 366 }
 367
 368 static void mos7840_dump_serial_port(struct usb_serial_port *port,
 369                                      struct moschip_port *mos7840_port)
 370 {
 371
 372         dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
 373         dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
 374         dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
 375
 376 }
 377
 378 /************************************************************************/
 379 /************************************************************************/
 380 /*             I N T E R F A C E   F U N C T I O N S                    */
 381 /*             I N T E R F A C E   F U N C T I O N S                    */
 382 /************************************************************************/
 383 /************************************************************************/
 384
 385 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 386                                             struct moschip_port *data)
 387 {
 388         usb_set_serial_port_data(port, (void *)data);
 389 }
 390
 391 static inline struct moschip_port *mos7840_get_port_private(struct
 392                                                             usb_serial_port
 393                                                             *port)
 394 {
 395         return (struct moschip_port *)usb_get_serial_port_data(port);
 396 }
 397
 398 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 399 {
 400         struct moschip_port *mos7840_port;
 401         struct async_icount *icount;
 402         mos7840_port = port;
 403         icount = &mos7840_port->icount;
 404         if (new_msr &
 405             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 406              MOS_MSR_DELTA_CD)) {
 407                 icount = &mos7840_port->icount;
 408
 409                 /* update input line counters */
 410                 if (new_msr & MOS_MSR_DELTA_CTS) {
 411                         icount->cts++;
 412                         smp_wmb();
 413                 }
 414                 if (new_msr & MOS_MSR_DELTA_DSR) {
 415                         icount->dsr++;
 416                         smp_wmb();
 417                 }
 418                 if (new_msr & MOS_MSR_DELTA_CD) {
 419                         icount->dcd++;
 420                         smp_wmb();
 421                 }
 422                 if (new_msr & MOS_MSR_DELTA_RI) {
 423                         icount->rng++;
 424                         smp_wmb();
 425                 }
 426         }
 427 }
 428
 429 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 430 {
 431         struct async_icount *icount;
 432
 433         if (new_lsr & SERIAL_LSR_BI) {
 434                 /*
 435                  * Parity and Framing errors only count if they
 436                  * occur exclusive of a break being
 437                  * received.
 438                  */
 439                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 440         }
 441
 442         /* update input line counters */
 443         icount = &port->icount;
 444         if (new_lsr & SERIAL_LSR_BI) {
 445                 icount->brk++;
 446                 smp_wmb();
 447         }
 448         if (new_lsr & SERIAL_LSR_OE) {
 449                 icount->overrun++;
 450                 smp_wmb();
 451         }
 452         if (new_lsr & SERIAL_LSR_PE) {
 453                 icount->parity++;
 454                 smp_wmb();
 455         }
 456         if (new_lsr & SERIAL_LSR_FE) {
 457                 icount->frame++;
 458                 smp_wmb();
 459         }
 460 }
 461
 462 /************************************************************************/
 463 /************************************************************************/
 464 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 465 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 466 /************************************************************************/
 467 /************************************************************************/
 468
 469 static void mos7840_control_callback(struct urb *urb)
 470 {
 471         unsigned char *data;
 472         struct moschip_port *mos7840_port;
 473         struct device *dev = &urb->dev->dev;
 474         __u8 regval = 0x0;
 475         int status = urb->status;
 476
 477         mos7840_port = urb->context;
 478
 479         switch (status) {
 480         case 0:
 481                 /* success */
 482                 break;
 483         case -ECONNRESET:
 484         case -ENOENT:
 485         case -ESHUTDOWN:
 486                 /* this urb is terminated, clean up */
 487                 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
 488                 return;
 489         default:
 490                 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
 491                 return;
 492         }
 493
 494         dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length);
 495         dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__,
 496                 mos7840_port->MsrLsr, mos7840_port->port_num);
 497         data = urb->transfer_buffer;
 498         regval = (__u8) data[0];
 499         dev_dbg(dev, "%s data is %x\n", __func__, regval);
 500         if (mos7840_port->MsrLsr == 0)
 501                 mos7840_handle_new_msr(mos7840_port, regval);
 502         else if (mos7840_port->MsrLsr == 1)
 503                 mos7840_handle_new_lsr(mos7840_port, regval);
 504 }
 505
 506 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 507                            __u16 *val)
 508 {
 509         struct usb_device *dev = mcs->port->serial->dev;
 510         struct usb_ctrlrequest *dr = mcs->dr;
 511         unsigned char *buffer = mcs->ctrl_buf;
 512         int ret;
 513
 514         dr->bRequestType = MCS_RD_RTYPE;
 515         dr->bRequest = MCS_RDREQ;
 516         dr->wValue = cpu_to_le16(Wval); /* 0 */
 517         dr->wIndex = cpu_to_le16(reg);
 518         dr->wLength = cpu_to_le16(2);
 519
 520         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 521                              (unsigned char *)dr, buffer, 2,
 522                              mos7840_control_callback, mcs);
 523         mcs->control_urb->transfer_buffer_length = 2;
 524         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 525         return ret;
 526 }
 527
 528 static void mos7840_set_led_callback(struct urb *urb)
 529 {
 530         switch (urb->status) {
 531         case 0:
 532                 /* Success */
 533                 break;
 534         case -ECONNRESET:
 535         case -ENOENT:
 536         case -ESHUTDOWN:
 537                 /* This urb is terminated, clean up */
 538                 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d",
 539                         __func__, urb->status);
 540                 break;
 541         default:
 542                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d",
 543                         __func__, urb->status);
 544         }
 545 }
 546
 547 static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
 548                                 __u16 reg)
 549 {
 550         struct usb_device *dev = mcs->port->serial->dev;
 551         struct usb_ctrlrequest *dr = mcs->dr;
 552
 553         dr->bRequestType = MCS_WR_RTYPE;
 554         dr->bRequest = MCS_WRREQ;
 555         dr->wValue = cpu_to_le16(wval);
 556         dr->wIndex = cpu_to_le16(reg);
 557         dr->wLength = cpu_to_le16(0);
 558
 559         usb_fill_control_urb(mcs->control_urb, dev, usb_sndctrlpipe(dev, 0),
 560                 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
 561
 562         usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 563 }
 564
 565 static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
 566                                 __u16 val)
 567 {
 568         struct usb_device *dev = port->serial->dev;
 569
 570         usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
 571                         val, reg, NULL, 0, MOS_WDR_TIMEOUT);
 572 }
 573
 574 static void mos7840_led_off(unsigned long arg)
 575 {
 576         struct moschip_port *mcs = (struct moschip_port *) arg;
 577
 578         /* Turn off LED */
 579         mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
 580         mod_timer(&mcs->led_timer2,
 581                                 jiffies + msecs_to_jiffies(LED_OFF_MS));
 582 }
 583
 584 static void mos7840_led_flag_off(unsigned long arg)
 585 {
 586         struct moschip_port *mcs = (struct moschip_port *) arg;
 587
 588         mcs->led_flag = false;
 589 }
 590
 591 /*****************************************************************************
 592  * mos7840_interrupt_callback
 593  *      this is the callback function for when we have received data on the
 594  *      interrupt endpoint.
 595  *****************************************************************************/
 596
 597 static void mos7840_interrupt_callback(struct urb *urb)
 598 {
 599         int result;
 600         int length;
 601         struct moschip_port *mos7840_port;
 602         struct usb_serial *serial;
 603         __u16 Data;
 604         unsigned char *data;
 605         __u8 sp[5], st;
 606         int i, rv = 0;
 607         __u16 wval, wreg = 0;
 608         int status = urb->status;
 609
 610         switch (status) {
 611         case 0:
 612                 /* success */
 613                 break;
 614         case -ECONNRESET:
 615         case -ENOENT:
 616         case -ESHUTDOWN:
 617                 /* this urb is terminated, clean up */
 618                 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
 619                         __func__, status);
 620                 return;
 621         default:
 622                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
 623                         __func__, status);
 624                 goto exit;
 625         }
 626
 627         length = urb->actual_length;
 628         data = urb->transfer_buffer;
 629
 630         serial = urb->context;
 631
 632         /* Moschip get 5 bytes
 633          * Byte 1 IIR Port 1 (port.number is 0)
 634          * Byte 2 IIR Port 2 (port.number is 1)
 635          * Byte 3 IIR Port 3 (port.number is 2)
 636          * Byte 4 IIR Port 4 (port.number is 3)
 637          * Byte 5 FIFO status for both */
 638
 639         if (length && length > 5) {
 640                 dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n");
 641                 return;
 642         }
 643
 644         sp[0] = (__u8) data[0];
 645         sp[1] = (__u8) data[1];
 646         sp[2] = (__u8) data[2];
 647         sp[3] = (__u8) data[3];
 648         st = (__u8) data[4];
 649
 650         for (i = 0; i < serial->num_ports; i++) {
 651                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 652                 wval =
 653                     (((__u16) serial->port[i]->number -
 654                       (__u16) (serial->minor)) + 1) << 8;
 655                 if (mos7840_port->open) {
 656                         if (sp[i] & 0x01) {
 657                                 dev_dbg(&urb->dev->dev, "SP%d No Interrupt !!!\n", i);
 658                         } else {
 659                                 switch (sp[i] & 0x0f) {
 660                                 case SERIAL_IIR_RLS:
 661                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Receiver status error or \n", i);
 662                                         dev_dbg(&urb->dev->dev, "address bit detected in 9-bit mode\n");
 663                                         mos7840_port->MsrLsr = 1;
 664                                         wreg = LINE_STATUS_REGISTER;
 665                                         break;
 666                                 case SERIAL_IIR_MS:
 667                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Modem status change\n", i);
 668                                         mos7840_port->MsrLsr = 0;
 669                                         wreg = MODEM_STATUS_REGISTER;
 670                                         break;
 671                                 }
 672                                 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 673                         }
 674                 }
 675         }
 676         if (!(rv < 0))
 677                 /* the completion handler for the control urb will resubmit */
 678                 return;
 679 exit:
 680         result = usb_submit_urb(urb, GFP_ATOMIC);
 681         if (result) {
 682                 dev_err(&urb->dev->dev,
 683                         "%s - Error %d submitting interrupt urb\n",
 684                         __func__, result);
 685         }
 686 }
 687
 688 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 689                                        const char *function)
 690 {
 691         if (!port) {
 692                 pr_debug("%s - port == NULL\n", function);
 693                 return -1;
 694         }
 695         if (!port->serial) {
 696                 pr_debug("%s - port->serial == NULL\n", function);
 697                 return -1;
 698         }
 699
 700         return 0;
 701 }
 702
 703 /* Inline functions to check the sanity of a pointer that is passed to us */
 704 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 705                                          const char *function)
 706 {
 707         if (!serial) {
 708                 pr_debug("%s - serial == NULL\n", function);
 709                 return -1;
 710         }
 711         if (!serial->type) {
 712                 pr_debug("%s - serial->type == NULL!\n", function);
 713                 return -1;
 714         }
 715
 716         return 0;
 717 }
 718
 719 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 720                                                  const char *function)
 721 {
 722         /* if no port was specified, or it fails a paranoia check */
 723         if (!port ||
 724             mos7840_port_paranoia_check(port, function) ||
 725             mos7840_serial_paranoia_check(port->serial, function)) {
 726                 /* then say that we don't have a valid usb_serial thing,
 727                  * which will end up genrating -ENODEV return values */
 728                 return NULL;
 729         }
 730
 731         return port->serial;
 732 }
 733
 734 /*****************************************************************************
 735  * mos7840_bulk_in_callback
 736  *      this is the callback function for when we have received data on the
 737  *      bulk in endpoint.
 738  *****************************************************************************/
 739
 740 static void mos7840_bulk_in_callback(struct urb *urb)
 741 {
 742         int retval;
 743         unsigned char *data;
 744         struct usb_serial *serial;
 745         struct usb_serial_port *port;
 746         struct moschip_port *mos7840_port;
 747         int status = urb->status;
 748
 749         mos7840_port = urb->context;
 750         if (!mos7840_port)
 751                 return;
 752
 753         if (status) {
 754                 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
 755                 mos7840_port->read_urb_busy = false;
 756                 return;
 757         }
 758
 759         port = mos7840_port->port;
 760         if (mos7840_port_paranoia_check(port, __func__)) {
 761                 mos7840_port->read_urb_busy = false;
 762                 return;
 763         }
 764
 765         serial = mos7840_get_usb_serial(port, __func__);
 766         if (!serial) {
 767                 mos7840_port->read_urb_busy = false;
 768                 return;
 769         }
 770
 771         data = urb->transfer_buffer;
 772         usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
 773
 774         if (urb->actual_length) {
 775                 struct tty_port *tport = &mos7840_port->port->port;
 776                 tty_insert_flip_string(tport, data, urb->actual_length);
 777                 tty_flip_buffer_push(tport);
 778                 mos7840_port->icount.rx += urb->actual_length;
 779                 smp_wmb();
 780                 dev_dbg(&port->dev, "mos7840_port->icount.rx is %d:\n", mos7840_port->icount.rx);
 781         }
 782
 783         if (!mos7840_port->read_urb) {
 784                 dev_dbg(&port->dev, "%s", "URB KILLED !!!\n");
 785                 mos7840_port->read_urb_busy = false;
 786                 return;
 787         }
 788
 789         /* Turn on LED */
 790         if (mos7840_port->has_led && !mos7840_port->led_flag) {
 791                 mos7840_port->led_flag = true;
 792                 mos7840_set_led_async(mos7840_port, 0x0301,
 793                                         MODEM_CONTROL_REGISTER);
 794                 mod_timer(&mos7840_port->led_timer1,
 795                                 jiffies + msecs_to_jiffies(LED_ON_MS));
 796         }
 797
 798         mos7840_port->read_urb_busy = true;
 799         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 800
 801         if (retval) {
 802                 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
 803                 mos7840_port->read_urb_busy = false;
 804         }
 805 }
 806
 807 /*****************************************************************************
 808  * mos7840_bulk_out_data_callback
 809  *      this is the callback function for when we have finished sending
 810  *      serial data on the bulk out endpoint.
 811  *****************************************************************************/
 812
 813 static void mos7840_bulk_out_data_callback(struct urb *urb)
 814 {
 815         struct moschip_port *mos7840_port;
 816         struct usb_serial_port *port;
 817         struct tty_struct *tty;
 818         int status = urb->status;
 819         int i;
 820
 821         mos7840_port = urb->context;
 822         port = mos7840_port->port;
 823         spin_lock(&mos7840_port->pool_lock);
 824         for (i = 0; i < NUM_URBS; i++) {
 825                 if (urb == mos7840_port->write_urb_pool[i]) {
 826                         mos7840_port->busy[i] = 0;
 827                         break;
 828                 }
 829         }
 830         spin_unlock(&mos7840_port->pool_lock);
 831
 832         if (status) {
 833                 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
 834                 return;
 835         }
 836
 837         if (mos7840_port_paranoia_check(port, __func__))
 838                 return;
 839
 840         tty = tty_port_tty_get(&port->port);
 841         if (tty && mos7840_port->open)
 842                 tty_wakeup(tty);
 843         tty_kref_put(tty);
 844
 845 }
 846
 847 /************************************************************************/
 848 /*       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       */
 849 /************************************************************************/
 850 #ifdef MCSSerialProbe
 851 static int mos7840_serial_probe(struct usb_serial *serial,
 852                                 const struct usb_device_id *id)
 853 {
 854
 855         /*need to implement the mode_reg reading and updating\
 856            structures usb_serial_ device_type\
 857            (i.e num_ports, num_bulkin,bulkout etc) */
 858         /* Also we can update the changes  attach */
 859         return 1;
 860 }
 861 #endif
 862
 863 /*****************************************************************************
 864  * mos7840_open
 865  *      this function is called by the tty driver when a port is opened
 866  *      If successful, we return 0
 867  *      Otherwise we return a negative error number.
 868  *****************************************************************************/
 869
 870 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
 871 {
 872         int response;
 873         int j;
 874         struct usb_serial *serial;
 875         struct urb *urb;
 876         __u16 Data;
 877         int status;
 878         struct moschip_port *mos7840_port;
 879         struct moschip_port *port0;
 880
 881         if (mos7840_port_paranoia_check(port, __func__))
 882                 return -ENODEV;
 883
 884         serial = port->serial;
 885
 886         if (mos7840_serial_paranoia_check(serial, __func__))
 887                 return -ENODEV;
 888
 889         mos7840_port = mos7840_get_port_private(port);
 890         port0 = mos7840_get_port_private(serial->port[0]);
 891
 892         if (mos7840_port == NULL || port0 == NULL)
 893                 return -ENODEV;
 894
 895         usb_clear_halt(serial->dev, port->write_urb->pipe);
 896         usb_clear_halt(serial->dev, port->read_urb->pipe);
 897         port0->open_ports++;
 898
 899         /* Initialising the write urb pool */
 900         for (j = 0; j < NUM_URBS; ++j) {
 901                 urb = usb_alloc_urb(0, GFP_KERNEL);
 902                 mos7840_port->write_urb_pool[j] = urb;
 903
 904                 if (urb == NULL) {
 905                         dev_err(&port->dev, "No more urbs???\n");
 906                         continue;
 907                 }
 908
 909                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 910                                                                 GFP_KERNEL);
 911                 if (!urb->transfer_buffer) {
 912                         usb_free_urb(urb);
 913                         mos7840_port->write_urb_pool[j] = NULL;
 914                         dev_err(&port->dev,
 915                                 "%s-out of memory for urb buffers.\n",
 916                                 __func__);
 917                         continue;
 918                 }
 919         }
 920
 921 /*****************************************************************************
 922  * Initialize MCS7840 -- Write Init values to corresponding Registers
 923  *
 924  * Register Index
 925  * 1 : IER
 926  * 2 : FCR
 927  * 3 : LCR
 928  * 4 : MCR
 929  *
 930  * 0x08 : SP1/2 Control Reg
 931  *****************************************************************************/
 932
 933         /* NEED to check the following Block */
 934
 935         Data = 0x0;
 936         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 937         if (status < 0) {
 938                 dev_dbg(&port->dev, "Reading Spreg failed\n");
 939                 return -1;
 940         }
 941         Data |= 0x80;
 942         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 943         if (status < 0) {
 944                 dev_dbg(&port->dev, "writing Spreg failed\n");
 945                 return -1;
 946         }
 947
 948         Data &= ~0x80;
 949         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 950         if (status < 0) {
 951                 dev_dbg(&port->dev, "writing Spreg failed\n");
 952                 return -1;
 953         }
 954         /* End of block to be checked */
 955
 956         Data = 0x0;
 957         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 958                                                                         &Data);
 959         if (status < 0) {
 960                 dev_dbg(&port->dev, "Reading Controlreg failed\n");
 961                 return -1;
 962         }
 963         Data |= 0x08;           /* Driver done bit */
 964         Data |= 0x20;           /* rx_disable */
 965         status = mos7840_set_reg_sync(port,
 966                                 mos7840_port->ControlRegOffset, Data);
 967         if (status < 0) {
 968                 dev_dbg(&port->dev, "writing Controlreg failed\n");
 969                 return -1;
 970         }
 971         /* do register settings here */
 972         /* Set all regs to the device default values. */
 973         /***********************************
 974          * First Disable all interrupts.
 975          ***********************************/
 976         Data = 0x00;
 977         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 978         if (status < 0) {
 979                 dev_dbg(&port->dev, "disabling interrupts failed\n");
 980                 return -1;
 981         }
 982         /* Set FIFO_CONTROL_REGISTER to the default value */
 983         Data = 0x00;
 984         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 985         if (status < 0) {
 986                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
 987                 return -1;
 988         }
 989
 990         Data = 0xcf;
 991         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 992         if (status < 0) {
 993                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
 994                 return -1;
 995         }
 996
 997         Data = 0x03;
 998         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 999         mos7840_port->shadowLCR = Data;
1000
1001         Data = 0x0b;
1002         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1003         mos7840_port->shadowMCR = Data;
1004
1005         Data = 0x00;
1006         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1007         mos7840_port->shadowLCR = Data;
1008
1009         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1010         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1011
1012         Data = 0x0c;
1013         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1014
1015         Data = 0x0;
1016         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1017
1018         Data = 0x00;
1019         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1020
1021         Data = Data & ~SERIAL_LCR_DLAB;
1022         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1023         mos7840_port->shadowLCR = Data;
1024
1025         /* clearing Bulkin and Bulkout Fifo */
1026         Data = 0x0;
1027         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1028
1029         Data = Data | 0x0c;
1030         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1031
1032         Data = Data & ~0x0c;
1033         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1034         /* Finally enable all interrupts */
1035         Data = 0x0c;
1036         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1037
1038         /* clearing rx_disable */
1039         Data = 0x0;
1040         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1041                                                                         &Data);
1042         Data = Data & ~0x20;
1043         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1044                                                                         Data);
1045
1046         /* rx_negate */
1047         Data = 0x0;
1048         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1049                                                                         &Data);
1050         Data = Data | 0x10;
1051         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1052                                                                         Data);
1053
1054         /* Check to see if we've set up our endpoint info yet    *
1055          * (can't set it up in mos7840_startup as the structures *
1056          * were not set up at that time.)                        */
1057         if (port0->open_ports == 1) {
1058                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1059                         /* set up interrupt urb */
1060                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1061                                 serial->dev,
1062                                 usb_rcvintpipe(serial->dev,
1063                                 serial->port[0]->interrupt_in_endpointAddress),
1064                                 serial->port[0]->interrupt_in_buffer,
1065                                 serial->port[0]->interrupt_in_urb->
1066                                 transfer_buffer_length,
1067                                 mos7840_interrupt_callback,
1068                                 serial,
1069                                 serial->port[0]->interrupt_in_urb->interval);
1070
1071                         /* start interrupt read for mos7840               *
1072                          * will continue as long as mos7840 is connected  */
1073
1074                         response =
1075                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1076                                            GFP_KERNEL);
1077                         if (response) {
1078                                 dev_err(&port->dev, "%s - Error %d submitting "
1079                                         "interrupt urb\n", __func__, response);
1080                         }
1081
1082                 }
1083
1084         }
1085
1086         /* see if we've set up our endpoint info yet   *
1087          * (can't set it up in mos7840_startup as the  *
1088          * structures were not set up at that time.)   */
1089
1090         dev_dbg(&port->dev, "port number is %d\n", port->number);
1091         dev_dbg(&port->dev, "serial number is %d\n", port->serial->minor);
1092         dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
1093         dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
1094         dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
1095         dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
1096         mos7840_port->read_urb = port->read_urb;
1097
1098         /* set up our bulk in urb */
1099         if ((serial->num_ports == 2)
1100                 && ((((__u16)port->number -
1101                         (__u16)(port->serial->minor)) % 2) != 0)) {
1102                 usb_fill_bulk_urb(mos7840_port->read_urb,
1103                         serial->dev,
1104                         usb_rcvbulkpipe(serial->dev,
1105                                 (port->bulk_in_endpointAddress) + 2),
1106                         port->bulk_in_buffer,
1107                         mos7840_port->read_urb->transfer_buffer_length,
1108                         mos7840_bulk_in_callback, mos7840_port);
1109         } else {
1110                 usb_fill_bulk_urb(mos7840_port->read_urb,
1111                         serial->dev,
1112                         usb_rcvbulkpipe(serial->dev,
1113                                 port->bulk_in_endpointAddress),
1114                         port->bulk_in_buffer,
1115                         mos7840_port->read_urb->transfer_buffer_length,
1116                         mos7840_bulk_in_callback, mos7840_port);
1117         }
1118
1119         dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
1120         mos7840_port->read_urb_busy = true;
1121         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1122         if (response) {
1123                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1124                         __func__, response);
1125                 mos7840_port->read_urb_busy = false;
1126         }
1127
1128         /* initialize our wait queues */
1129         init_waitqueue_head(&mos7840_port->wait_chase);
1130         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1131
1132         /* initialize our icount structure */
1133         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1134
1135         /* initialize our port settings */
1136         /* Must set to enable ints! */
1137         mos7840_port->shadowMCR = MCR_MASTER_IE;
1138         /* send a open port command */
1139         mos7840_port->open = 1;
1140         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1141         mos7840_port->icount.tx = 0;
1142         mos7840_port->icount.rx = 0;
1143
1144         return 0;
1145 }
1146
1147 /*****************************************************************************
1148  * mos7840_chars_in_buffer
1149  *      this function is called by the tty driver when it wants to know how many
1150  *      bytes of data we currently have outstanding in the port (data that has
1151  *      been written, but hasn't made it out the port yet)
1152  *      If successful, we return the number of bytes left to be written in the
1153  *      system,
1154  *      Otherwise we return zero.
1155  *****************************************************************************/
1156
1157 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1158 {
1159         struct usb_serial_port *port = tty->driver_data;
1160         int i;
1161         int chars = 0;
1162         unsigned long flags;
1163         struct moschip_port *mos7840_port;
1164
1165         if (mos7840_port_paranoia_check(port, __func__))
1166                 return 0;
1167
1168         mos7840_port = mos7840_get_port_private(port);
1169         if (mos7840_port == NULL)
1170                 return 0;
1171
1172         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1173         for (i = 0; i < NUM_URBS; ++i) {
1174                 if (mos7840_port->busy[i]) {
1175                         struct urb *urb = mos7840_port->write_urb_pool[i];
1176                         chars += urb->transfer_buffer_length;
1177                 }
1178         }
1179         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1180         dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1181         return chars;
1182
1183 }
1184
1185 /*****************************************************************************
1186  * mos7840_close
1187  *      this function is called by the tty driver when a port is closed
1188  *****************************************************************************/
1189
1190 static void mos7840_close(struct usb_serial_port *port)
1191 {
1192         struct usb_serial *serial;
1193         struct moschip_port *mos7840_port;
1194         struct moschip_port *port0;
1195         int j;
1196         __u16 Data;
1197
1198         if (mos7840_port_paranoia_check(port, __func__))
1199                 return;
1200
1201         serial = mos7840_get_usb_serial(port, __func__);
1202         if (!serial)
1203                 return;
1204
1205         mos7840_port = mos7840_get_port_private(port);
1206         port0 = mos7840_get_port_private(serial->port[0]);
1207
1208         if (mos7840_port == NULL || port0 == NULL)
1209                 return;
1210
1211         for (j = 0; j < NUM_URBS; ++j)
1212                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1213
1214         /* Freeing Write URBs */
1215         for (j = 0; j < NUM_URBS; ++j) {
1216                 if (mos7840_port->write_urb_pool[j]) {
1217                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1218                                 kfree(mos7840_port->write_urb_pool[j]->
1219                                       transfer_buffer);
1220
1221                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1222                 }
1223         }
1224
1225         /* While closing port, shutdown all bulk read, write  *
1226          * and interrupt read if they exists                  */
1227         if (serial->dev) {
1228                 if (mos7840_port->write_urb) {
1229                         dev_dbg(&port->dev, "%s", "Shutdown bulk write\n");
1230                         usb_kill_urb(mos7840_port->write_urb);
1231                 }
1232                 if (mos7840_port->read_urb) {
1233                         dev_dbg(&port->dev, "%s", "Shutdown bulk read\n");
1234                         usb_kill_urb(mos7840_port->read_urb);
1235                         mos7840_port->read_urb_busy = false;
1236                 }
1237                 if ((&mos7840_port->control_urb)) {
1238                         dev_dbg(&port->dev, "%s", "Shutdown control read\n");
1239                         /*/      usb_kill_urb (mos7840_port->control_urb); */
1240                 }
1241         }
1242 /*      if(mos7840_port->ctrl_buf != NULL) */
1243 /*              kfree(mos7840_port->ctrl_buf); */
1244         port0->open_ports--;
1245         dev_dbg(&port->dev, "%s in close%d:in port%d\n", __func__, port0->open_ports, port->number);
1246         if (port0->open_ports == 0) {
1247                 if (serial->port[0]->interrupt_in_urb) {
1248                         dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n");
1249                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1250                 }
1251         }
1252
1253         if (mos7840_port->write_urb) {
1254                 /* if this urb had a transfer buffer already (old tx) free it */
1255                 if (mos7840_port->write_urb->transfer_buffer != NULL)
1256                         kfree(mos7840_port->write_urb->transfer_buffer);
1257                 usb_free_urb(mos7840_port->write_urb);
1258         }
1259
1260         Data = 0x0;
1261         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1262
1263         Data = 0x00;
1264         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1265
1266         mos7840_port->open = 0;
1267 }
1268
1269 /************************************************************************
1270  *
1271  * mos7840_block_until_chase_response
1272  *
1273  *      This function will block the close until one of the following:
1274  *              1. Response to our Chase comes from mos7840
1275  *              2. A timeout of 10 seconds without activity has expired
1276  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1277  *
1278  ************************************************************************/
1279
1280 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1281                                         struct moschip_port *mos7840_port)
1282 {
1283         int timeout = msecs_to_jiffies(1000);
1284         int wait = 10;
1285         int count;
1286
1287         while (1) {
1288                 count = mos7840_chars_in_buffer(tty);
1289
1290                 /* Check for Buffer status */
1291                 if (count <= 0)
1292                         return;
1293
1294                 /* Block the thread for a while */
1295                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1296                                                timeout);
1297                 /* No activity.. count down section */
1298                 wait--;
1299                 if (wait == 0) {
1300                         dev_dbg(&mos7840_port->port->dev, "%s - TIMEOUT\n", __func__);
1301                         return;
1302                 } else {
1303                         /* Reset timeout value back to seconds */
1304                         wait = 10;
1305                 }
1306         }
1307
1308 }
1309
1310 /*****************************************************************************
1311  * mos7840_break
1312  *      this function sends a break to the port
1313  *****************************************************************************/
1314 static void mos7840_break(struct tty_struct *tty, int break_state)
1315 {
1316         struct usb_serial_port *port = tty->driver_data;
1317         unsigned char data;
1318         struct usb_serial *serial;
1319         struct moschip_port *mos7840_port;
1320
1321         if (mos7840_port_paranoia_check(port, __func__))
1322                 return;
1323
1324         serial = mos7840_get_usb_serial(port, __func__);
1325         if (!serial)
1326                 return;
1327
1328         mos7840_port = mos7840_get_port_private(port);
1329
1330         if (mos7840_port == NULL)
1331                 return;
1332
1333         if (serial->dev)
1334                 /* flush and block until tx is empty */
1335                 mos7840_block_until_chase_response(tty, mos7840_port);
1336
1337         if (break_state == -1)
1338                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1339         else
1340                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1341
1342         /* FIXME: no locking on shadowLCR anywhere in driver */
1343         mos7840_port->shadowLCR = data;
1344         dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1345         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1346                              mos7840_port->shadowLCR);
1347 }
1348
1349 /*****************************************************************************
1350  * mos7840_write_room
1351  *      this function is called by the tty driver when it wants to know how many
1352  *      bytes of data we can accept for a specific port.
1353  *      If successful, we return the amount of room that we have for this port
1354  *      Otherwise we return a negative error number.
1355  *****************************************************************************/
1356
1357 static int mos7840_write_room(struct tty_struct *tty)
1358 {
1359         struct usb_serial_port *port = tty->driver_data;
1360         int i;
1361         int room = 0;
1362         unsigned long flags;
1363         struct moschip_port *mos7840_port;
1364
1365         if (mos7840_port_paranoia_check(port, __func__))
1366                 return -1;
1367
1368         mos7840_port = mos7840_get_port_private(port);
1369         if (mos7840_port == NULL)
1370                 return -1;
1371
1372         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1373         for (i = 0; i < NUM_URBS; ++i) {
1374                 if (!mos7840_port->busy[i])
1375                         room += URB_TRANSFER_BUFFER_SIZE;
1376         }
1377         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1378
1379         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1380         dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room);
1381         return room;
1382
1383 }
1384
1385 /*****************************************************************************
1386  * mos7840_write
1387  *      this function is called by the tty driver when data should be written to
1388  *      the port.
1389  *      If successful, we return the number of bytes written, otherwise we
1390  *      return a negative error number.
1391  *****************************************************************************/
1392
1393 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1394                          const unsigned char *data, int count)
1395 {
1396         int status;
1397         int i;
1398         int bytes_sent = 0;
1399         int transfer_size;
1400         unsigned long flags;
1401
1402         struct moschip_port *mos7840_port;
1403         struct usb_serial *serial;
1404         struct urb *urb;
1405         /* __u16 Data; */
1406         const unsigned char *current_position = data;
1407         unsigned char *data1;
1408
1409 #ifdef NOTMOS7840
1410         Data = 0x00;
1411         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1412         mos7840_port->shadowLCR = Data;
1413         dev_dbg(&port->dev, "%s: LINE_CONTROL_REGISTER is %x\n", __func__, Data);
1414         dev_dbg(&port->dev, "%s: mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1415
1416         /* Data = 0x03; */
1417         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1418         /* mos7840_port->shadowLCR=Data;//Need to add later */
1419
1420         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1421         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1422
1423         /* Data = 0x0c; */
1424         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1425         Data = 0x00;
1426         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1427         dev_dbg(&port->dev, "%s: DLL value is %x\n", __func__, Data);
1428
1429         Data = 0x0;
1430         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1431         dev_dbg(&port->dev, "%s: DLM value is %x\n", __func__, Data);
1432
1433         Data = Data & ~SERIAL_LCR_DLAB;
1434         dev_dbg(&port->dev, "%s: mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1435         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1436 #endif
1437
1438         if (mos7840_port_paranoia_check(port, __func__))
1439                 return -1;
1440
1441         serial = port->serial;
1442         if (mos7840_serial_paranoia_check(serial, __func__))
1443                 return -1;
1444
1445         mos7840_port = mos7840_get_port_private(port);
1446         if (mos7840_port == NULL)
1447                 return -1;
1448
1449         /* try to find a free urb in the list */
1450         urb = NULL;
1451
1452         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1453         for (i = 0; i < NUM_URBS; ++i) {
1454                 if (!mos7840_port->busy[i]) {
1455                         mos7840_port->busy[i] = 1;
1456                         urb = mos7840_port->write_urb_pool[i];
1457                         dev_dbg(&port->dev, "URB:%d\n", i);
1458                         break;
1459                 }
1460         }
1461         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1462
1463         if (urb == NULL) {
1464                 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1465                 goto exit;
1466         }
1467
1468         if (urb->transfer_buffer == NULL) {
1469                 urb->transfer_buffer =
1470                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1471
1472                 if (urb->transfer_buffer == NULL) {
1473                         dev_err_console(port, "%s no more kernel memory...\n",
1474                                 __func__);
1475                         goto exit;
1476                 }
1477         }
1478         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1479
1480         memcpy(urb->transfer_buffer, current_position, transfer_size);
1481
1482         /* fill urb with data and submit  */
1483         if ((serial->num_ports == 2)
1484                 && ((((__u16)port->number -
1485                         (__u16)(port->serial->minor)) % 2) != 0)) {
1486                 usb_fill_bulk_urb(urb,
1487                         serial->dev,
1488                         usb_sndbulkpipe(serial->dev,
1489                                 (port->bulk_out_endpointAddress) + 2),
1490                         urb->transfer_buffer,
1491                         transfer_size,
1492                         mos7840_bulk_out_data_callback, mos7840_port);
1493         } else {
1494                 usb_fill_bulk_urb(urb,
1495                         serial->dev,
1496                         usb_sndbulkpipe(serial->dev,
1497                                 port->bulk_out_endpointAddress),
1498                         urb->transfer_buffer,
1499                         transfer_size,
1500                         mos7840_bulk_out_data_callback, mos7840_port);
1501         }
1502
1503         data1 = urb->transfer_buffer;
1504         dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
1505
1506         /* Turn on LED */
1507         if (mos7840_port->has_led && !mos7840_port->led_flag) {
1508                 mos7840_port->led_flag = true;
1509                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0301);
1510                 mod_timer(&mos7840_port->led_timer1,
1511                                 jiffies + msecs_to_jiffies(LED_ON_MS));
1512         }
1513
1514         /* send it down the pipe */
1515         status = usb_submit_urb(urb, GFP_ATOMIC);
1516
1517         if (status) {
1518                 mos7840_port->busy[i] = 0;
1519                 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1520                         "with status = %d\n", __func__, status);
1521                 bytes_sent = status;
1522                 goto exit;
1523         }
1524         bytes_sent = transfer_size;
1525         mos7840_port->icount.tx += transfer_size;
1526         smp_wmb();
1527         dev_dbg(&port->dev, "mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx);
1528 exit:
1529         return bytes_sent;
1530
1531 }
1532
1533 /*****************************************************************************
1534  * mos7840_throttle
1535  *      this function is called by the tty driver when it wants to stop the data
1536  *      being read from the port.
1537  *****************************************************************************/
1538
1539 static void mos7840_throttle(struct tty_struct *tty)
1540 {
1541         struct usb_serial_port *port = tty->driver_data;
1542         struct moschip_port *mos7840_port;
1543         int status;
1544
1545         if (mos7840_port_paranoia_check(port, __func__))
1546                 return;
1547
1548         mos7840_port = mos7840_get_port_private(port);
1549
1550         if (mos7840_port == NULL)
1551                 return;
1552
1553         if (!mos7840_port->open) {
1554                 dev_dbg(&port->dev, "%s", "port not opened\n");
1555                 return;
1556         }
1557
1558         /* if we are implementing XON/XOFF, send the stop character */
1559         if (I_IXOFF(tty)) {
1560                 unsigned char stop_char = STOP_CHAR(tty);
1561                 status = mos7840_write(tty, port, &stop_char, 1);
1562                 if (status <= 0)
1563                         return;
1564         }
1565         /* if we are implementing RTS/CTS, toggle that line */
1566         if (tty->termios.c_cflag & CRTSCTS) {
1567                 mos7840_port->shadowMCR &= ~MCR_RTS;
1568                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1569                                          mos7840_port->shadowMCR);
1570                 if (status < 0)
1571                         return;
1572         }
1573 }
1574
1575 /*****************************************************************************
1576  * mos7840_unthrottle
1577  *      this function is called by the tty driver when it wants to resume
1578  *      the data being read from the port (called after mos7840_throttle is
1579  *      called)
1580  *****************************************************************************/
1581 static void mos7840_unthrottle(struct tty_struct *tty)
1582 {
1583         struct usb_serial_port *port = tty->driver_data;
1584         int status;
1585         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1586
1587         if (mos7840_port_paranoia_check(port, __func__))
1588                 return;
1589
1590         if (mos7840_port == NULL)
1591                 return;
1592
1593         if (!mos7840_port->open) {
1594                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1595                 return;
1596         }
1597
1598         /* if we are implementing XON/XOFF, send the start character */
1599         if (I_IXOFF(tty)) {
1600                 unsigned char start_char = START_CHAR(tty);
1601                 status = mos7840_write(tty, port, &start_char, 1);
1602                 if (status <= 0)
1603                         return;
1604         }
1605
1606         /* if we are implementing RTS/CTS, toggle that line */
1607         if (tty->termios.c_cflag & CRTSCTS) {
1608                 mos7840_port->shadowMCR |= MCR_RTS;
1609                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1610                                          mos7840_port->shadowMCR);
1611                 if (status < 0)
1612                         return;
1613         }
1614 }
1615
1616 static int mos7840_tiocmget(struct tty_struct *tty)
1617 {
1618         struct usb_serial_port *port = tty->driver_data;
1619         struct moschip_port *mos7840_port;
1620         unsigned int result;
1621         __u16 msr;
1622         __u16 mcr;
1623         int status;
1624         mos7840_port = mos7840_get_port_private(port);
1625
1626         if (mos7840_port == NULL)
1627                 return -ENODEV;
1628
1629         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1630         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1631         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1632             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1633             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1634             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1635             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1636             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1637             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1638
1639         dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1640
1641         return result;
1642 }
1643
1644 static int mos7840_tiocmset(struct tty_struct *tty,
1645                             unsigned int set, unsigned int clear)
1646 {
1647         struct usb_serial_port *port = tty->driver_data;
1648         struct moschip_port *mos7840_port;
1649         unsigned int mcr;
1650         int status;
1651
1652         mos7840_port = mos7840_get_port_private(port);
1653
1654         if (mos7840_port == NULL)
1655                 return -ENODEV;
1656
1657         /* FIXME: What locks the port registers ? */
1658         mcr = mos7840_port->shadowMCR;
1659         if (clear & TIOCM_RTS)
1660                 mcr &= ~MCR_RTS;
1661         if (clear & TIOCM_DTR)
1662                 mcr &= ~MCR_DTR;
1663         if (clear & TIOCM_LOOP)
1664                 mcr &= ~MCR_LOOPBACK;
1665
1666         if (set & TIOCM_RTS)
1667                 mcr |= MCR_RTS;
1668         if (set & TIOCM_DTR)
1669                 mcr |= MCR_DTR;
1670         if (set & TIOCM_LOOP)
1671                 mcr |= MCR_LOOPBACK;
1672
1673         mos7840_port->shadowMCR = mcr;
1674
1675         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1676         if (status < 0) {
1677                 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1678                 return status;
1679         }
1680
1681         return 0;
1682 }
1683
1684 /*****************************************************************************
1685  * mos7840_calc_baud_rate_divisor
1686  *      this function calculates the proper baud rate divisor for the specified
1687  *      baud rate.
1688  *****************************************************************************/
1689 static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1690                                           int baudRate, int *divisor,
1691                                           __u16 *clk_sel_val)
1692 {
1693         dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1694
1695         if (baudRate <= 115200) {
1696                 *divisor = 115200 / baudRate;
1697                 *clk_sel_val = 0x0;
1698         }
1699         if ((baudRate > 115200) && (baudRate <= 230400)) {
1700                 *divisor = 230400 / baudRate;
1701                 *clk_sel_val = 0x10;
1702         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1703                 *divisor = 403200 / baudRate;
1704                 *clk_sel_val = 0x20;
1705         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1706                 *divisor = 460800 / baudRate;
1707                 *clk_sel_val = 0x30;
1708         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1709                 *divisor = 806400 / baudRate;
1710                 *clk_sel_val = 0x40;
1711         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1712                 *divisor = 921600 / baudRate;
1713                 *clk_sel_val = 0x50;
1714         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1715                 *divisor = 1572864 / baudRate;
1716                 *clk_sel_val = 0x60;
1717         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1718                 *divisor = 3145728 / baudRate;
1719                 *clk_sel_val = 0x70;
1720         }
1721         return 0;
1722
1723 #ifdef NOTMCS7840
1724
1725         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1726                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1727                         *divisor = mos7840_divisor_table[i].Divisor;
1728                         return 0;
1729                 }
1730         }
1731
1732         /* After trying for all the standard baud rates    *
1733          * Try calculating the divisor for this baud rate  */
1734
1735         if (baudrate > 75 && baudrate < 230400) {
1736                 /* get the divisor */
1737                 custom = (__u16) (230400L / baudrate);
1738
1739                 /* Check for round off */
1740                 round1 = (__u16) (2304000L / baudrate);
1741                 round = (__u16) (round1 - (custom * 10));
1742                 if (round > 4)
1743                         custom++;
1744                 *divisor = custom;
1745
1746                 dev_dbg(&port->dev, " Baud %d = %d\n", baudrate, custom);
1747                 return 0;
1748         }
1749
1750         dev_dbg(&port->dev, "%s", " Baud calculation Failed...\n");
1751         return -1;
1752 #endif
1753 }
1754
1755 /*****************************************************************************
1756  * mos7840_send_cmd_write_baud_rate
1757  *      this function sends the proper command to change the baud rate of the
1758  *      specified port.
1759  *****************************************************************************/
1760
1761 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1762                                             int baudRate)
1763 {
1764         int divisor = 0;
1765         int status;
1766         __u16 Data;
1767         unsigned char number;
1768         __u16 clk_sel_val;
1769         struct usb_serial_port *port;
1770
1771         if (mos7840_port == NULL)
1772                 return -1;
1773
1774         port = mos7840_port->port;
1775         if (mos7840_port_paranoia_check(port, __func__))
1776                 return -1;
1777
1778         if (mos7840_serial_paranoia_check(port->serial, __func__))
1779                 return -1;
1780
1781         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1782
1783         dev_dbg(&port->dev, "%s - port = %d, baud = %d\n", __func__,
1784                 mos7840_port->port->number, baudRate);
1785         /* reset clk_uart_sel in spregOffset */
1786         if (baudRate > 115200) {
1787 #ifdef HW_flow_control
1788                 /* NOTE: need to see the pther register to modify */
1789                 /* setting h/w flow control bit to 1 */
1790                 Data = 0x2b;
1791                 mos7840_port->shadowMCR = Data;
1792                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1793                                                                         Data);
1794                 if (status < 0) {
1795                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1796                         return -1;
1797                 }
1798 #endif
1799
1800         } else {
1801 #ifdef HW_flow_control
1802                 /* setting h/w flow control bit to 0 */
1803                 Data = 0xb;
1804                 mos7840_port->shadowMCR = Data;
1805                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1806                                                                         Data);
1807                 if (status < 0) {
1808                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1809                         return -1;
1810                 }
1811 #endif
1812
1813         }
1814
1815         if (1) {                /* baudRate <= 115200) */
1816                 clk_sel_val = 0x0;
1817                 Data = 0x0;
1818                 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1819                                                    &clk_sel_val);
1820                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1821                                                                  &Data);
1822                 if (status < 0) {
1823                         dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1824                         return -1;
1825                 }
1826                 Data = (Data & 0x8f) | clk_sel_val;
1827                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1828                                                                 Data);
1829                 if (status < 0) {
1830                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1831                         return -1;
1832                 }
1833                 /* Calculate the Divisor */
1834
1835                 if (status) {
1836                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1837                         return status;
1838                 }
1839                 /* Enable access to divisor latch */
1840                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1841                 mos7840_port->shadowLCR = Data;
1842                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1843
1844                 /* Write the divisor */
1845                 Data = (unsigned char)(divisor & 0xff);
1846                 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1847                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1848
1849                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1850                 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1851                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1852
1853                 /* Disable access to divisor latch */
1854                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1855                 mos7840_port->shadowLCR = Data;
1856                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1857
1858         }
1859         return status;
1860 }
1861
1862 /*****************************************************************************
1863  * mos7840_change_port_settings
1864  *      This routine is called to set the UART on the device to match
1865  *      the specified new settings.
1866  *****************************************************************************/
1867
1868 static void mos7840_change_port_settings(struct tty_struct *tty,
1869         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1870 {
1871         int baud;
1872         unsigned cflag;
1873         unsigned iflag;
1874         __u8 lData;
1875         __u8 lParity;
1876         __u8 lStop;
1877         int status;
1878         __u16 Data;
1879         struct usb_serial_port *port;
1880         struct usb_serial *serial;
1881
1882         if (mos7840_port == NULL)
1883                 return;
1884
1885         port = mos7840_port->port;
1886
1887         if (mos7840_port_paranoia_check(port, __func__))
1888                 return;
1889
1890         if (mos7840_serial_paranoia_check(port->serial, __func__))
1891                 return;
1892
1893         serial = port->serial;
1894
1895         if (!mos7840_port->open) {
1896                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1897                 return;
1898         }
1899
1900         lData = LCR_BITS_8;
1901         lStop = LCR_STOP_1;
1902         lParity = LCR_PAR_NONE;
1903
1904         cflag = tty->termios.c_cflag;
1905         iflag = tty->termios.c_iflag;
1906
1907         /* Change the number of bits */
1908         if (cflag & CSIZE) {
1909                 switch (cflag & CSIZE) {
1910                 case CS5:
1911                         lData = LCR_BITS_5;
1912                         break;
1913
1914                 case CS6:
1915                         lData = LCR_BITS_6;
1916                         break;
1917
1918                 case CS7:
1919                         lData = LCR_BITS_7;
1920                         break;
1921                 default:
1922                 case CS8:
1923                         lData = LCR_BITS_8;
1924                         break;
1925                 }
1926         }
1927         /* Change the Parity bit */
1928         if (cflag & PARENB) {
1929                 if (cflag & PARODD) {
1930                         lParity = LCR_PAR_ODD;
1931                         dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1932                 } else {
1933                         lParity = LCR_PAR_EVEN;
1934                         dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1935                 }
1936
1937         } else {
1938                 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1939         }
1940
1941         if (cflag & CMSPAR)
1942                 lParity = lParity | 0x20;
1943
1944         /* Change the Stop bit */
1945         if (cflag & CSTOPB) {
1946                 lStop = LCR_STOP_2;
1947                 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1948         } else {
1949                 lStop = LCR_STOP_1;
1950                 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1951         }
1952
1953         /* Update the LCR with the correct value */
1954         mos7840_port->shadowLCR &=
1955             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1956         mos7840_port->shadowLCR |= (lData | lParity | lStop);
1957
1958         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1959                 mos7840_port->shadowLCR);
1960         /* Disable Interrupts */
1961         Data = 0x00;
1962         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1963
1964         Data = 0x00;
1965         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1966
1967         Data = 0xcf;
1968         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1969
1970         /* Send the updated LCR value to the mos7840 */
1971         Data = mos7840_port->shadowLCR;
1972
1973         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1974
1975         Data = 0x00b;
1976         mos7840_port->shadowMCR = Data;
1977         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1978         Data = 0x00b;
1979         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1980
1981         /* set up the MCR register and send it to the mos7840 */
1982
1983         mos7840_port->shadowMCR = MCR_MASTER_IE;
1984         if (cflag & CBAUD)
1985                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1986
1987         if (cflag & CRTSCTS)
1988                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1989         else
1990                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1991
1992         Data = mos7840_port->shadowMCR;
1993         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1994
1995         /* Determine divisor based on baud rate */
1996         baud = tty_get_baud_rate(tty);
1997
1998         if (!baud) {
1999                 /* pick a default, any default... */
2000                 dev_dbg(&port->dev, "%s", "Picked default baud...\n");
2001                 baud = 9600;
2002         }
2003
2004         dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
2005         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2006
2007         /* Enable Interrupts */
2008         Data = 0x0c;
2009         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2010
2011         if (mos7840_port->read_urb_busy == false) {
2012                 mos7840_port->read_urb_busy = true;
2013                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2014                 if (status) {
2015                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
2016                             status);
2017                         mos7840_port->read_urb_busy = false;
2018                 }
2019         }
2020         wake_up(&mos7840_port->delta_msr_wait);
2021         mos7840_port->delta_msr_cond = 1;
2022         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
2023                 mos7840_port->shadowLCR);
2024 }
2025
2026 /*****************************************************************************
2027  * mos7840_set_termios
2028  *      this function is called by the tty driver when it wants to change
2029  *      the termios structure
2030  *****************************************************************************/
2031
2032 static void mos7840_set_termios(struct tty_struct *tty,
2033                                 struct usb_serial_port *port,
2034                                 struct ktermios *old_termios)
2035 {
2036         int status;
2037         unsigned int cflag;
2038         struct usb_serial *serial;
2039         struct moschip_port *mos7840_port;
2040
2041         if (mos7840_port_paranoia_check(port, __func__))
2042                 return;
2043
2044         serial = port->serial;
2045
2046         if (mos7840_serial_paranoia_check(serial, __func__))
2047                 return;
2048
2049         mos7840_port = mos7840_get_port_private(port);
2050
2051         if (mos7840_port == NULL)
2052                 return;
2053
2054         if (!mos7840_port->open) {
2055                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
2056                 return;
2057         }
2058
2059         dev_dbg(&port->dev, "%s", "setting termios - \n");
2060
2061         cflag = tty->termios.c_cflag;
2062
2063         dev_dbg(&port->dev, "%s - clfag %08x iflag %08x\n", __func__,
2064                 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
2065         dev_dbg(&port->dev, "%s - old clfag %08x old iflag %08x\n", __func__,
2066                 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2067         dev_dbg(&port->dev, "%s - port %d\n", __func__, port->number);
2068
2069         /* change the port settings to the new ones specified */
2070
2071         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2072
2073         if (!mos7840_port->read_urb) {
2074                 dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n");
2075                 return;
2076         }
2077
2078         if (mos7840_port->read_urb_busy == false) {
2079                 mos7840_port->read_urb_busy = true;
2080                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2081                 if (status) {
2082                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
2083                             status);
2084                         mos7840_port->read_urb_busy = false;
2085                 }
2086         }
2087 }
2088
2089 /*****************************************************************************
2090  * mos7840_get_lsr_info - get line status register info
2091  *
2092  * Purpose: Let user call ioctl() to get info when the UART physically
2093  *          is emptied.  On bus types like RS485, the transmitter must
2094  *          release the bus after transmitting. This must be done when
2095  *          the transmit shift register is empty, not be done when the
2096  *          transmit holding register is empty.  This functionality
2097  *          allows an RS485 driver to be written in user space.
2098  *****************************************************************************/
2099
2100 static int mos7840_get_lsr_info(struct tty_struct *tty,
2101                                 unsigned int __user *value)
2102 {
2103         int count;
2104         unsigned int result = 0;
2105
2106         count = mos7840_chars_in_buffer(tty);
2107         if (count == 0)
2108                 result = TIOCSER_TEMT;
2109
2110         if (copy_to_user(value, &result, sizeof(int)))
2111                 return -EFAULT;
2112         return 0;
2113 }
2114
2115 /*****************************************************************************
2116  * mos7840_get_serial_info
2117  *      function to get information about serial port
2118  *****************************************************************************/
2119
2120 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2121                                    struct serial_struct __user *retinfo)
2122 {
2123         struct serial_struct tmp;
2124
2125         if (mos7840_port == NULL)
2126                 return -1;
2127
2128         if (!retinfo)
2129                 return -EFAULT;
2130
2131         memset(&tmp, 0, sizeof(tmp));
2132
2133         tmp.type = PORT_16550A;
2134         tmp.line = mos7840_port->port->serial->minor;
2135         tmp.port = mos7840_port->port->number;
2136         tmp.irq = 0;
2137         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2138         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2139         tmp.baud_base = 9600;
2140         tmp.close_delay = 5 * HZ;
2141         tmp.closing_wait = 30 * HZ;
2142
2143         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2144                 return -EFAULT;
2145         return 0;
2146 }
2147
2148 static int mos7840_get_icount(struct tty_struct *tty,
2149                         struct serial_icounter_struct *icount)
2150 {
2151         struct usb_serial_port *port = tty->driver_data;
2152         struct moschip_port *mos7840_port;
2153         struct async_icount cnow;
2154
2155         mos7840_port = mos7840_get_port_private(port);
2156         cnow = mos7840_port->icount;
2157
2158         smp_rmb();
2159         icount->cts = cnow.cts;
2160         icount->dsr = cnow.dsr;
2161         icount->rng = cnow.rng;
2162         icount->dcd = cnow.dcd;
2163         icount->rx = cnow.rx;
2164         icount->tx = cnow.tx;
2165         icount->frame = cnow.frame;
2166         icount->overrun = cnow.overrun;
2167         icount->parity = cnow.parity;
2168         icount->brk = cnow.brk;
2169         icount->buf_overrun = cnow.buf_overrun;
2170
2171         dev_dbg(&port->dev, "%s TIOCGICOUNT RX=%d, TX=%d\n", __func__,
2172                 icount->rx, icount->tx);
2173         return 0;
2174 }
2175
2176 /*****************************************************************************
2177  * SerialIoctl
2178  *      this function handles any ioctl calls to the driver
2179  *****************************************************************************/
2180
2181 static int mos7840_ioctl(struct tty_struct *tty,
2182                          unsigned int cmd, unsigned long arg)
2183 {
2184         struct usb_serial_port *port = tty->driver_data;
2185         void __user *argp = (void __user *)arg;
2186         struct moschip_port *mos7840_port;
2187
2188         struct async_icount cnow;
2189         struct async_icount cprev;
2190
2191         if (mos7840_port_paranoia_check(port, __func__))
2192                 return -1;
2193
2194         mos7840_port = mos7840_get_port_private(port);
2195
2196         if (mos7840_port == NULL)
2197                 return -1;
2198
2199         dev_dbg(&port->dev, "%s - cmd = 0x%x\n", __func__, cmd);
2200
2201         switch (cmd) {
2202                 /* return number of bytes available */
2203
2204         case TIOCSERGETLSR:
2205                 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
2206                 return mos7840_get_lsr_info(tty, argp);
2207
2208         case TIOCGSERIAL:
2209                 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
2210                 return mos7840_get_serial_info(mos7840_port, argp);
2211
2212         case TIOCSSERIAL:
2213                 dev_dbg(&port->dev, "%s TIOCSSERIAL\n", __func__);
2214                 break;
2215
2216         case TIOCMIWAIT:
2217                 dev_dbg(&port->dev, "%s  TIOCMIWAIT\n", __func__);
2218                 cprev = mos7840_port->icount;
2219                 while (1) {
2220                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2221                         mos7840_port->delta_msr_cond = 0;
2222                         wait_event_interruptible(mos7840_port->delta_msr_wait,
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                         cnow = mos7840_port->icount;
2230                         smp_rmb();
2231                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2232                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2233                                 return -EIO;    /* no change => error */
2234                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2235                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2236                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2237                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2238                                 return 0;
2239                         }
2240                         cprev = cnow;
2241                 }
2242                 /* NOTREACHED */
2243                 break;
2244
2245         default:
2246                 break;
2247         }
2248         return -ENOIOCTLCMD;
2249 }
2250
2251 static int mos7810_check(struct usb_serial *serial)
2252 {
2253         int i, pass_count = 0;
2254         __u16 data = 0, mcr_data = 0;
2255         __u16 test_pattern = 0x55AA;
2256
2257         /* Store MCR setting */
2258         usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2259                 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
2260                 &mcr_data, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2261
2262         for (i = 0; i < 16; i++) {
2263                 /* Send the 1-bit test pattern out to MCS7810 test pin */
2264                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2265                         MCS_WRREQ, MCS_WR_RTYPE,
2266                         (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
2267                         MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
2268
2269                 /* Read the test pattern back */
2270                 usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2271                         MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &data,
2272                         VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2273
2274                 /* If this is a MCS7810 device, both test patterns must match */
2275                 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
2276                         break;
2277
2278                 pass_count++;
2279         }
2280
2281         /* Restore MCR setting */
2282         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
2283                 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
2284                 0, MOS_WDR_TIMEOUT);
2285
2286         if (pass_count == 16)
2287                 return 1;
2288
2289         return 0;
2290 }
2291
2292 static int mos7840_calc_num_ports(struct usb_serial *serial)
2293 {
2294         __u16 data = 0x00;
2295         int mos7840_num_ports;
2296
2297         usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2298                 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &data,
2299                 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2300
2301         if (serial->dev->descriptor.idProduct == MOSCHIP_DEVICE_ID_7810 ||
2302                 serial->dev->descriptor.idProduct == MOSCHIP_DEVICE_ID_7820) {
2303                 device_type = serial->dev->descriptor.idProduct;
2304         } else {
2305                 /* For a MCS7840 device GPIO0 must be set to 1 */
2306                 if ((data & 0x01) == 1)
2307                         device_type = MOSCHIP_DEVICE_ID_7840;
2308                 else if (mos7810_check(serial))
2309                         device_type = MOSCHIP_DEVICE_ID_7810;
2310                 else
2311                         device_type = MOSCHIP_DEVICE_ID_7820;
2312         }
2313
2314         mos7840_num_ports = (device_type >> 4) & 0x000F;
2315         serial->num_bulk_in = mos7840_num_ports;
2316         serial->num_bulk_out = mos7840_num_ports;
2317         serial->num_ports = mos7840_num_ports;
2318
2319         return mos7840_num_ports;
2320 }
2321
2322 static int mos7840_port_probe(struct usb_serial_port *port)
2323 {
2324         struct usb_serial *serial = port->serial;
2325         struct moschip_port *mos7840_port;
2326         int status;
2327         int pnum;
2328         __u16 Data;
2329
2330         /* we set up the pointers to the endpoints in the mos7840_open *
2331          * function, as the structures aren't created yet.             */
2332
2333         pnum = port->number - serial->minor;
2334
2335         dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
2336         mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2337         if (mos7840_port == NULL) {
2338                 dev_err(&port->dev, "%s - Out of memory\n", __func__);
2339                 return -ENOMEM;
2340         }
2341
2342         /* Initialize all port interrupt end point to port 0 int
2343          * endpoint. Our device has only one interrupt end point
2344          * common to all port */
2345
2346         mos7840_port->port = port;
2347         mos7840_set_port_private(port, mos7840_port);
2348         spin_lock_init(&mos7840_port->pool_lock);
2349
2350         /* minor is not initialised until later by
2351          * usb-serial.c:get_free_serial() and cannot therefore be used
2352          * to index device instances */
2353         mos7840_port->port_num = pnum + 1;
2354         dev_dbg(&port->dev, "port->number = %d\n", port->number);
2355         dev_dbg(&port->dev, "port->serial->minor = %d\n", port->serial->minor);
2356         dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
2357         dev_dbg(&port->dev, "serial->minor = %d\n", serial->minor);
2358
2359         if (mos7840_port->port_num == 1) {
2360                 mos7840_port->SpRegOffset = 0x0;
2361                 mos7840_port->ControlRegOffset = 0x1;
2362                 mos7840_port->DcrRegOffset = 0x4;
2363         } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 4)) {
2364                 mos7840_port->SpRegOffset = 0x8;
2365                 mos7840_port->ControlRegOffset = 0x9;
2366                 mos7840_port->DcrRegOffset = 0x16;
2367         } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 2)) {
2368                 mos7840_port->SpRegOffset = 0xa;
2369                 mos7840_port->ControlRegOffset = 0xb;
2370                 mos7840_port->DcrRegOffset = 0x19;
2371         } else if ((mos7840_port->port_num == 3) && (serial->num_ports == 4)) {
2372                 mos7840_port->SpRegOffset = 0xa;
2373                 mos7840_port->ControlRegOffset = 0xb;
2374                 mos7840_port->DcrRegOffset = 0x19;
2375         } else if ((mos7840_port->port_num == 4) && (serial->num_ports == 4)) {
2376                 mos7840_port->SpRegOffset = 0xc;
2377                 mos7840_port->ControlRegOffset = 0xd;
2378                 mos7840_port->DcrRegOffset = 0x1c;
2379         }
2380         mos7840_dump_serial_port(port, mos7840_port);
2381         mos7840_set_port_private(port, mos7840_port);
2382
2383         /* enable rx_disable bit in control register */
2384         status = mos7840_get_reg_sync(port,
2385                         mos7840_port->ControlRegOffset, &Data);
2386         if (status < 0) {
2387                 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
2388                 goto out;
2389         } else
2390                 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
2391         Data |= 0x08;   /* setting driver done bit */
2392         Data |= 0x04;   /* sp1_bit to have cts change reflect in
2393                            modem status reg */
2394
2395         /* Data |= 0x20; //rx_disable bit */
2396         status = mos7840_set_reg_sync(port,
2397                         mos7840_port->ControlRegOffset, Data);
2398         if (status < 0) {
2399                 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2400                 goto out;
2401         } else
2402                 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
2403
2404         /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2405            and 0x24 in DCR3 */
2406         Data = 0x01;
2407         status = mos7840_set_reg_sync(port,
2408                         (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2409         if (status < 0) {
2410                 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
2411                 goto out;
2412         } else
2413                 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
2414
2415         Data = 0x05;
2416         status = mos7840_set_reg_sync(port,
2417                         (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2418         if (status < 0) {
2419                 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
2420                 goto out;
2421         } else
2422                 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
2423
2424         Data = 0x24;
2425         status = mos7840_set_reg_sync(port,
2426                         (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2427         if (status < 0) {
2428                 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
2429                 goto out;
2430         } else
2431                 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
2432
2433         /* write values in clkstart0x0 and clkmulti 0x20 */
2434         Data = 0x0;
2435         status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
2436         if (status < 0) {
2437                 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2438                 goto out;
2439         } else
2440                 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2441
2442         Data = 0x20;
2443         status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
2444         if (status < 0) {
2445                 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
2446                 goto error;
2447         } else
2448                 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
2449
2450         /* write value 0x0 to scratchpad register */
2451         Data = 0x00;
2452         status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
2453         if (status < 0) {
2454                 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
2455                 goto out;
2456         } else
2457                 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
2458
2459         /* Zero Length flag register */
2460         if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
2461                 Data = 0xff;
2462                 status = mos7840_set_reg_sync(port,
2463                                 (__u16) (ZLP_REG1 +
2464                                         ((__u16)mos7840_port->port_num)), Data);
2465                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2466                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
2467                 if (status < 0) {
2468                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
2469                         goto out;
2470                 } else
2471                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
2472         } else {
2473                 Data = 0xff;
2474                 status = mos7840_set_reg_sync(port,
2475                                 (__u16) (ZLP_REG1 +
2476                                         ((__u16)mos7840_port->port_num) - 0x1), Data);
2477                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2478                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
2479                 if (status < 0) {
2480                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
2481                         goto out;
2482                 } else
2483                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
2484
2485         }
2486         mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2487         mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2488         mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2489                         GFP_KERNEL);
2490         if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2491                         !mos7840_port->dr) {
2492                 status = -ENOMEM;
2493                 goto error;
2494         }
2495
2496         mos7840_port->has_led = false;
2497
2498         /* Initialize LED timers */
2499         if (device_type == MOSCHIP_DEVICE_ID_7810) {
2500                 mos7840_port->has_led = true;
2501
2502                 init_timer(&mos7840_port->led_timer1);
2503                 mos7840_port->led_timer1.function = mos7840_led_off;
2504                 mos7840_port->led_timer1.expires =
2505                         jiffies + msecs_to_jiffies(LED_ON_MS);
2506                 mos7840_port->led_timer1.data = (unsigned long)mos7840_port;
2507
2508                 init_timer(&mos7840_port->led_timer2);
2509                 mos7840_port->led_timer2.function = mos7840_led_flag_off;
2510                 mos7840_port->led_timer2.expires =
2511                         jiffies + msecs_to_jiffies(LED_OFF_MS);
2512                 mos7840_port->led_timer2.data = (unsigned long)mos7840_port;
2513
2514                 mos7840_port->led_flag = false;
2515
2516                 /* Turn off LED */
2517                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2518         }
2519 out:
2520         if (pnum == serial->num_ports - 1) {
2521                 /* Zero Length flag enable */
2522                 Data = 0x0f;
2523                 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2524                 if (status < 0) {
2525                         dev_dbg(&port->dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
2526                         goto error;
2527                 } else
2528                         dev_dbg(&port->dev, "ZLP_REG5 Writing success status%d\n", status);
2529
2530                 /* setting configuration feature to one */
2531                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2532                                 0x03, 0x00, 0x01, 0x00, NULL, 0x00,
2533                                 MOS_WDR_TIMEOUT);
2534         }
2535         return 0;
2536 error:
2537         kfree(mos7840_port->dr);
2538         kfree(mos7840_port->ctrl_buf);
2539         usb_free_urb(mos7840_port->control_urb);
2540         kfree(mos7840_port);
2541
2542         return status;
2543 }
2544
2545 static int mos7840_port_remove(struct usb_serial_port *port)
2546 {
2547         struct moschip_port *mos7840_port;
2548
2549         mos7840_port = mos7840_get_port_private(port);
2550
2551         if (mos7840_port->has_led) {
2552                 /* Turn off LED */
2553                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2554
2555                 del_timer_sync(&mos7840_port->led_timer1);
2556                 del_timer_sync(&mos7840_port->led_timer2);
2557         }
2558         usb_kill_urb(mos7840_port->control_urb);
2559         usb_free_urb(mos7840_port->control_urb);
2560         kfree(mos7840_port->ctrl_buf);
2561         kfree(mos7840_port->dr);
2562         kfree(mos7840_port);
2563
2564         return 0;
2565 }
2566
2567 static struct usb_serial_driver moschip7840_4port_device = {
2568         .driver = {
2569                    .owner = THIS_MODULE,
2570                    .name = "mos7840",
2571                    },
2572         .description = DRIVER_DESC,
2573         .id_table = id_table,
2574         .num_ports = 4,
2575         .open = mos7840_open,
2576         .close = mos7840_close,
2577         .write = mos7840_write,
2578         .write_room = mos7840_write_room,
2579         .chars_in_buffer = mos7840_chars_in_buffer,
2580         .throttle = mos7840_throttle,
2581         .unthrottle = mos7840_unthrottle,
2582         .calc_num_ports = mos7840_calc_num_ports,
2583 #ifdef MCSSerialProbe
2584         .probe = mos7840_serial_probe,
2585 #endif
2586         .ioctl = mos7840_ioctl,
2587         .set_termios = mos7840_set_termios,
2588         .break_ctl = mos7840_break,
2589         .tiocmget = mos7840_tiocmget,
2590         .tiocmset = mos7840_tiocmset,
2591         .get_icount = mos7840_get_icount,
2592         .port_probe = mos7840_port_probe,
2593         .port_remove = mos7840_port_remove,
2594         .read_bulk_callback = mos7840_bulk_in_callback,
2595         .read_int_callback = mos7840_interrupt_callback,
2596 };
2597
2598 static struct usb_serial_driver * const serial_drivers[] = {
2599         &moschip7840_4port_device, NULL
2600 };
2601
2602 module_usb_serial_driver(serial_drivers, id_table);
2603
2604 MODULE_DESCRIPTION(DRIVER_DESC);
2605 MODULE_LICENSE("GPL");