drivers/usb/serial/mos7840.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  15  *
  16  * Clean ups from Moschip version and a few ioctl implementations by:
  17  *      Paul B Schroeder <pschroeder "at" uplogix "dot" com>
  18  *
  19  * Originally based on drivers/usb/serial/io_edgeport.c which is:
  20  *      Copyright (C) 2000 Inside Out Networks, All rights reserved.
  21  *      Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
  22  *
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/errno.h>
  27 #include <linux/init.h>
  28 #include <linux/slab.h>
  29 #include <linux/tty.h>
  30 #include <linux/tty_driver.h>
  31 #include <linux/tty_flip.h>
  32 #include <linux/module.h>
  33 #include <linux/serial.h>
  34 #include <linux/usb.h>
  35 #include <linux/usb/serial.h>
  36 #include <linux/uaccess.h>
  37
  38 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
  39
  40 /*
  41  * 16C50 UART register defines
  42  */
  43
  44 #define LCR_BITS_5             0x00     /* 5 bits/char */
  45 #define LCR_BITS_6             0x01     /* 6 bits/char */
  46 #define LCR_BITS_7             0x02     /* 7 bits/char */
  47 #define LCR_BITS_8             0x03     /* 8 bits/char */
  48 #define LCR_BITS_MASK          0x03     /* Mask for bits/char field */
  49
  50 #define LCR_STOP_1             0x00     /* 1 stop bit */
  51 #define LCR_STOP_1_5           0x04     /* 1.5 stop bits (if 5   bits/char) */
  52 #define LCR_STOP_2             0x04     /* 2 stop bits   (if 6-8 bits/char) */
  53 #define LCR_STOP_MASK          0x04     /* Mask for stop bits field */
  54
  55 #define LCR_PAR_NONE           0x00     /* No parity */
  56 #define LCR_PAR_ODD            0x08     /* Odd parity */
  57 #define LCR_PAR_EVEN           0x18     /* Even parity */
  58 #define LCR_PAR_MARK           0x28     /* Force parity bit to 1 */
  59 #define LCR_PAR_SPACE          0x38     /* Force parity bit to 0 */
  60 #define LCR_PAR_MASK           0x38     /* Mask for parity field */
  61
  62 #define LCR_SET_BREAK          0x40     /* Set Break condition */
  63 #define LCR_DL_ENABLE          0x80     /* Enable access to divisor latch */
  64
  65 #define MCR_DTR                0x01     /* Assert DTR */
  66 #define MCR_RTS                0x02     /* Assert RTS */
  67 #define MCR_OUT1               0x04     /* Loopback only: Sets state of RI */
  68 #define MCR_MASTER_IE          0x08     /* Enable interrupt outputs */
  69 #define MCR_LOOPBACK           0x10     /* Set internal (digital) loopback mode */
  70 #define MCR_XON_ANY            0x20     /* Enable any char to exit XOFF mode */
  71
  72 #define MOS7840_MSR_CTS        0x10     /* Current state of CTS */
  73 #define MOS7840_MSR_DSR        0x20     /* Current state of DSR */
  74 #define MOS7840_MSR_RI         0x40     /* Current state of RI */
  75 #define MOS7840_MSR_CD         0x80     /* Current state of CD */
  76
  77 /*
  78  * Defines used for sending commands to port
  79  */
  80
  81 #define MOS_WDR_TIMEOUT         5000    /* default urb timeout */
  82
  83 #define MOS_PORT1       0x0200
  84 #define MOS_PORT2       0x0300
  85 #define MOS_VENREG      0x0000
  86 #define MOS_MAX_PORT    0x02
  87 #define MOS_WRITE       0x0E
  88 #define MOS_READ        0x0D
  89
  90 /* Requests */
  91 #define MCS_RD_RTYPE    0xC0
  92 #define MCS_WR_RTYPE    0x40
  93 #define MCS_RDREQ       0x0D
  94 #define MCS_WRREQ       0x0E
  95 #define MCS_CTRL_TIMEOUT        500
  96 #define VENDOR_READ_LENGTH      (0x01)
  97
  98 #define MAX_NAME_LEN    64
  99
 100 #define ZLP_REG1  0x3A          /* Zero_Flag_Reg1    58 */
 101 #define ZLP_REG5  0x3E          /* Zero_Flag_Reg5    62 */
 102
 103 /* For higher baud Rates use TIOCEXBAUD */
 104 #define TIOCEXBAUD     0x5462
 105
 106 /* vendor id and device id defines */
 107
 108 /* The native mos7840/7820 component */
 109 #define USB_VENDOR_ID_MOSCHIP           0x9710
 110 #define MOSCHIP_DEVICE_ID_7840          0x7840
 111 #define MOSCHIP_DEVICE_ID_7820          0x7820
 112 #define MOSCHIP_DEVICE_ID_7810          0x7810
 113 /* The native component can have its vendor/device id's overridden
 114  * in vendor-specific implementations.  Such devices can be handled
 115  * by making a change here, in id_table.
 116  */
 117 #define USB_VENDOR_ID_BANDB              0x0856
 118 #define BANDB_DEVICE_ID_USO9ML2_2        0xAC22
 119 #define BANDB_DEVICE_ID_USO9ML2_2P       0xBC00
 120 #define BANDB_DEVICE_ID_USO9ML2_4        0xAC24
 121 #define BANDB_DEVICE_ID_USO9ML2_4P       0xBC01
 122 #define BANDB_DEVICE_ID_US9ML2_2         0xAC29
 123 #define BANDB_DEVICE_ID_US9ML2_4         0xAC30
 124 #define BANDB_DEVICE_ID_USPTL4_2         0xAC31
 125 #define BANDB_DEVICE_ID_USPTL4_4         0xAC32
 126 #define BANDB_DEVICE_ID_USOPTL4_2        0xAC42
 127 #define BANDB_DEVICE_ID_USOPTL4_2P       0xBC02
 128 #define BANDB_DEVICE_ID_USOPTL4_4        0xAC44
 129 #define BANDB_DEVICE_ID_USOPTL4_4P       0xBC03
 130 #define BANDB_DEVICE_ID_USOPTL2_4        0xAC24
 131
 132 /* This driver also supports
 133  * ATEN UC2324 device using Moschip MCS7840
 134  * ATEN UC2322 device using Moschip MCS7820
 135  */
 136 #define USB_VENDOR_ID_ATENINTL          0x0557
 137 #define ATENINTL_DEVICE_ID_UC2324       0x2011
 138 #define ATENINTL_DEVICE_ID_UC2322       0x7820
 139
 140 /* Interrupt Routine Defines    */
 141
 142 #define SERIAL_IIR_RLS      0x06
 143 #define SERIAL_IIR_MS       0x00
 144
 145 /*
 146  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 147  */
 148 #define SERIAL_LSR_DR       0x0001
 149 #define SERIAL_LSR_OE       0x0002
 150 #define SERIAL_LSR_PE       0x0004
 151 #define SERIAL_LSR_FE       0x0008
 152 #define SERIAL_LSR_BI       0x0010
 153
 154 #define MOS_MSR_DELTA_CTS   0x10
 155 #define MOS_MSR_DELTA_DSR   0x20
 156 #define MOS_MSR_DELTA_RI    0x40
 157 #define MOS_MSR_DELTA_CD    0x80
 158
 159 /* Serial Port register Address */
 160 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 161 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 162 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 163 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 164 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 165 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 166 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 167 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 168 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 169
 170 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 171 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 172 #define GPIO_REGISTER              ((__u16)(0x07))
 173
 174 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 175
 176 /*
 177  * URB POOL related defines
 178  */
 179 #define NUM_URBS                        16      /* URB Count */
 180 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 181
 182 /* LED on/off milliseconds*/
 183 #define LED_ON_MS       500
 184 #define LED_OFF_MS      500
 185
 186 static int device_type;
 187
 188 static const struct usb_device_id id_table[] = {
 189         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 190         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 191         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
 192         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
 193         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
 194         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 195         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
 196         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 197         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 198         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 199         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 200         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 201         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
 202         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 203         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
 204         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
 205         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 206         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 207         {}                      /* terminating entry */
 208 };
 209 MODULE_DEVICE_TABLE(usb, id_table);
 210
 211 /* This structure holds all of the local port information */
 212
 213 struct moschip_port {
 214         int port_num;           /*Actual port number in the device(1,2,etc) */
 215         struct urb *write_urb;  /* write URB for this port */
 216         struct urb *read_urb;   /* read URB for this port */
 217         __u8 shadowLCR;         /* last LCR value received */
 218         __u8 shadowMCR;         /* last MCR value received */
 219         char open;
 220         char open_ports;
 221         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 222         int delta_msr_cond;
 223         struct async_icount icount;
 224         struct usb_serial_port *port;   /* loop back to the owner of this object */
 225
 226         /* Offsets */
 227         __u8 SpRegOffset;
 228         __u8 ControlRegOffset;
 229         __u8 DcrRegOffset;
 230         /* for processing control URBS in interrupt context */
 231         struct urb *control_urb;
 232         struct usb_ctrlrequest *dr;
 233         char *ctrl_buf;
 234         int MsrLsr;
 235
 236         spinlock_t pool_lock;
 237         struct urb *write_urb_pool[NUM_URBS];
 238         char busy[NUM_URBS];
 239         bool read_urb_busy;
 240
 241         /* For device(s) with LED indicator */
 242         bool has_led;
 243         bool led_flag;
 244         struct timer_list led_timer1;   /* Timer for LED on */
 245         struct timer_list led_timer2;   /* Timer for LED off */
 246 };
 247
 248 /*
 249  * mos7840_set_reg_sync
 250  *      To set the Control register by calling usb_fill_control_urb function
 251  *      by passing usb_sndctrlpipe function as parameter.
 252  */
 253
 254 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 255                                 __u16 val)
 256 {
 257         struct usb_device *dev = port->serial->dev;
 258         val = val & 0x00ff;
 259         dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
 260
 261         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 262                                MCS_WR_RTYPE, val, reg, NULL, 0,
 263                                MOS_WDR_TIMEOUT);
 264 }
 265
 266 /*
 267  * mos7840_get_reg_sync
 268  *      To set the Uart register by calling usb_fill_control_urb function by
 269  *      passing usb_rcvctrlpipe function as parameter.
 270  */
 271
 272 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 273                                 __u16 *val)
 274 {
 275         struct usb_device *dev = port->serial->dev;
 276         int ret = 0;
 277         u8 *buf;
 278
 279         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 280         if (!buf)
 281                 return -ENOMEM;
 282
 283         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 284                               MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
 285                               MOS_WDR_TIMEOUT);
 286         *val = buf[0];
 287         dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
 288
 289         kfree(buf);
 290         return ret;
 291 }
 292
 293 /*
 294  * mos7840_set_uart_reg
 295  *      To set the Uart register by calling usb_fill_control_urb function by
 296  *      passing usb_sndctrlpipe function as parameter.
 297  */
 298
 299 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 300                                 __u16 val)
 301 {
 302
 303         struct usb_device *dev = port->serial->dev;
 304         val = val & 0x00ff;
 305         /* For the UART control registers, the application number need
 306            to be Or'ed */
 307         if (port->serial->num_ports == 4) {
 308                 val |= (((__u16) port->number -
 309                                 (__u16) (port->serial->minor)) + 1) << 8;
 310         } else {
 311                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 312                         val |= (((__u16) port->number -
 313                               (__u16) (port->serial->minor)) + 1) << 8;
 314                 } else {
 315                         val |= (((__u16) port->number -
 316                               (__u16) (port->serial->minor)) + 2) << 8;
 317                 }
 318         }
 319         dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
 320         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 321                                MCS_WR_RTYPE, val, reg, NULL, 0,
 322                                MOS_WDR_TIMEOUT);
 323
 324 }
 325
 326 /*
 327  * mos7840_get_uart_reg
 328  *      To set the Control register by calling usb_fill_control_urb function
 329  *      by passing usb_rcvctrlpipe function as parameter.
 330  */
 331 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 332                                 __u16 *val)
 333 {
 334         struct usb_device *dev = port->serial->dev;
 335         int ret = 0;
 336         __u16 Wval;
 337         u8 *buf;
 338
 339         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 340         if (!buf)
 341                 return -ENOMEM;
 342
 343         /* Wval  is same as application number */
 344         if (port->serial->num_ports == 4) {
 345                 Wval =
 346                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 347                      1) << 8;
 348         } else {
 349                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 350                         Wval = (((__u16) port->number -
 351                               (__u16) (port->serial->minor)) + 1) << 8;
 352                 } else {
 353                         Wval = (((__u16) port->number -
 354                               (__u16) (port->serial->minor)) + 2) << 8;
 355                 }
 356         }
 357         dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
 358         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 359                               MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
 360                               MOS_WDR_TIMEOUT);
 361         *val = buf[0];
 362
 363         kfree(buf);
 364         return ret;
 365 }
 366
 367 static void mos7840_dump_serial_port(struct usb_serial_port *port,
 368                                      struct moschip_port *mos7840_port)
 369 {
 370
 371         dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
 372         dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
 373         dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
 374
 375 }
 376
 377 /************************************************************************/
 378 /************************************************************************/
 379 /*             I N T E R F A C E   F U N C T I O N S                    */
 380 /*             I N T E R F A C E   F U N C T I O N S                    */
 381 /************************************************************************/
 382 /************************************************************************/
 383
 384 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 385                                             struct moschip_port *data)
 386 {
 387         usb_set_serial_port_data(port, (void *)data);
 388 }
 389
 390 static inline struct moschip_port *mos7840_get_port_private(struct
 391                                                             usb_serial_port
 392                                                             *port)
 393 {
 394         return (struct moschip_port *)usb_get_serial_port_data(port);
 395 }
 396
 397 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 398 {
 399         struct moschip_port *mos7840_port;
 400         struct async_icount *icount;
 401         mos7840_port = port;
 402         icount = &mos7840_port->icount;
 403         if (new_msr &
 404             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 405              MOS_MSR_DELTA_CD)) {
 406                 icount = &mos7840_port->icount;
 407
 408                 /* update input line counters */
 409                 if (new_msr & MOS_MSR_DELTA_CTS) {
 410                         icount->cts++;
 411                         smp_wmb();
 412                 }
 413                 if (new_msr & MOS_MSR_DELTA_DSR) {
 414                         icount->dsr++;
 415                         smp_wmb();
 416                 }
 417                 if (new_msr & MOS_MSR_DELTA_CD) {
 418                         icount->dcd++;
 419                         smp_wmb();
 420                 }
 421                 if (new_msr & MOS_MSR_DELTA_RI) {
 422                         icount->rng++;
 423                         smp_wmb();
 424                 }
 425
 426                 mos7840_port->delta_msr_cond = 1;
 427                 wake_up_interruptible(&port->port->delta_msr_wait);
 428         }
 429 }
 430
 431 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 432 {
 433         struct async_icount *icount;
 434
 435         if (new_lsr & SERIAL_LSR_BI) {
 436                 /*
 437                  * Parity and Framing errors only count if they
 438                  * occur exclusive of a break being
 439                  * received.
 440                  */
 441                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 442         }
 443
 444         /* update input line counters */
 445         icount = &port->icount;
 446         if (new_lsr & SERIAL_LSR_BI) {
 447                 icount->brk++;
 448                 smp_wmb();
 449         }
 450         if (new_lsr & SERIAL_LSR_OE) {
 451                 icount->overrun++;
 452                 smp_wmb();
 453         }
 454         if (new_lsr & SERIAL_LSR_PE) {
 455                 icount->parity++;
 456                 smp_wmb();
 457         }
 458         if (new_lsr & SERIAL_LSR_FE) {
 459                 icount->frame++;
 460                 smp_wmb();
 461         }
 462 }
 463
 464 /************************************************************************/
 465 /************************************************************************/
 466 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 467 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 468 /************************************************************************/
 469 /************************************************************************/
 470
 471 static void mos7840_control_callback(struct urb *urb)
 472 {
 473         unsigned char *data;
 474         struct moschip_port *mos7840_port;
 475         struct device *dev = &urb->dev->dev;
 476         __u8 regval = 0x0;
 477         int status = urb->status;
 478
 479         mos7840_port = urb->context;
 480
 481         switch (status) {
 482         case 0:
 483                 /* success */
 484                 break;
 485         case -ECONNRESET:
 486         case -ENOENT:
 487         case -ESHUTDOWN:
 488                 /* this urb is terminated, clean up */
 489                 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
 490                 return;
 491         default:
 492                 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
 493                 return;
 494         }
 495
 496         dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length);
 497         dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__,
 498                 mos7840_port->MsrLsr, mos7840_port->port_num);
 499         data = urb->transfer_buffer;
 500         regval = (__u8) data[0];
 501         dev_dbg(dev, "%s data is %x\n", __func__, regval);
 502         if (mos7840_port->MsrLsr == 0)
 503                 mos7840_handle_new_msr(mos7840_port, regval);
 504         else if (mos7840_port->MsrLsr == 1)
 505                 mos7840_handle_new_lsr(mos7840_port, regval);
 506 }
 507
 508 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 509                            __u16 *val)
 510 {
 511         struct usb_device *dev = mcs->port->serial->dev;
 512         struct usb_ctrlrequest *dr = mcs->dr;
 513         unsigned char *buffer = mcs->ctrl_buf;
 514         int ret;
 515
 516         dr->bRequestType = MCS_RD_RTYPE;
 517         dr->bRequest = MCS_RDREQ;
 518         dr->wValue = cpu_to_le16(Wval); /* 0 */
 519         dr->wIndex = cpu_to_le16(reg);
 520         dr->wLength = cpu_to_le16(2);
 521
 522         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 523                              (unsigned char *)dr, buffer, 2,
 524                              mos7840_control_callback, mcs);
 525         mcs->control_urb->transfer_buffer_length = 2;
 526         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 527         return ret;
 528 }
 529
 530 static void mos7840_set_led_callback(struct urb *urb)
 531 {
 532         switch (urb->status) {
 533         case 0:
 534                 /* Success */
 535                 break;
 536         case -ECONNRESET:
 537         case -ENOENT:
 538         case -ESHUTDOWN:
 539                 /* This urb is terminated, clean up */
 540                 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d",
 541                         __func__, urb->status);
 542                 break;
 543         default:
 544                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d",
 545                         __func__, urb->status);
 546         }
 547 }
 548
 549 static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
 550                                 __u16 reg)
 551 {
 552         struct usb_device *dev = mcs->port->serial->dev;
 553         struct usb_ctrlrequest *dr = mcs->dr;
 554
 555         dr->bRequestType = MCS_WR_RTYPE;
 556         dr->bRequest = MCS_WRREQ;
 557         dr->wValue = cpu_to_le16(wval);
 558         dr->wIndex = cpu_to_le16(reg);
 559         dr->wLength = cpu_to_le16(0);
 560
 561         usb_fill_control_urb(mcs->control_urb, dev, usb_sndctrlpipe(dev, 0),
 562                 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
 563
 564         usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 565 }
 566
 567 static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
 568                                 __u16 val)
 569 {
 570         struct usb_device *dev = port->serial->dev;
 571
 572         usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
 573                         val, reg, NULL, 0, MOS_WDR_TIMEOUT);
 574 }
 575
 576 static void mos7840_led_off(unsigned long arg)
 577 {
 578         struct moschip_port *mcs = (struct moschip_port *) arg;
 579
 580         /* Turn off LED */
 581         mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
 582         mod_timer(&mcs->led_timer2,
 583                                 jiffies + msecs_to_jiffies(LED_OFF_MS));
 584 }
 585
 586 static void mos7840_led_flag_off(unsigned long arg)
 587 {
 588         struct moschip_port *mcs = (struct moschip_port *) arg;
 589
 590         mcs->led_flag = false;
 591 }
 592
 593 /*****************************************************************************
 594  * mos7840_interrupt_callback
 595  *      this is the callback function for when we have received data on the
 596  *      interrupt endpoint.
 597  *****************************************************************************/
 598
 599 static void mos7840_interrupt_callback(struct urb *urb)
 600 {
 601         int result;
 602         int length;
 603         struct moschip_port *mos7840_port;
 604         struct usb_serial *serial;
 605         __u16 Data;
 606         unsigned char *data;
 607         __u8 sp[5], st;
 608         int i, rv = 0;
 609         __u16 wval, wreg = 0;
 610         int status = urb->status;
 611
 612         switch (status) {
 613         case 0:
 614                 /* success */
 615                 break;
 616         case -ECONNRESET:
 617         case -ENOENT:
 618         case -ESHUTDOWN:
 619                 /* this urb is terminated, clean up */
 620                 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
 621                         __func__, status);
 622                 return;
 623         default:
 624                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
 625                         __func__, status);
 626                 goto exit;
 627         }
 628
 629         length = urb->actual_length;
 630         data = urb->transfer_buffer;
 631
 632         serial = urb->context;
 633
 634         /* Moschip get 5 bytes
 635          * Byte 1 IIR Port 1 (port.number is 0)
 636          * Byte 2 IIR Port 2 (port.number is 1)
 637          * Byte 3 IIR Port 3 (port.number is 2)
 638          * Byte 4 IIR Port 4 (port.number is 3)
 639          * Byte 5 FIFO status for both */
 640
 641         if (length && length > 5) {
 642                 dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n");
 643                 return;
 644         }
 645
 646         sp[0] = (__u8) data[0];
 647         sp[1] = (__u8) data[1];
 648         sp[2] = (__u8) data[2];
 649         sp[3] = (__u8) data[3];
 650         st = (__u8) data[4];
 651
 652         for (i = 0; i < serial->num_ports; i++) {
 653                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 654                 wval =
 655                     (((__u16) serial->port[i]->number -
 656                       (__u16) (serial->minor)) + 1) << 8;
 657                 if (mos7840_port->open) {
 658                         if (sp[i] & 0x01) {
 659                                 dev_dbg(&urb->dev->dev, "SP%d No Interrupt !!!\n", i);
 660                         } else {
 661                                 switch (sp[i] & 0x0f) {
 662                                 case SERIAL_IIR_RLS:
 663                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Receiver status error or \n", i);
 664                                         dev_dbg(&urb->dev->dev, "address bit detected in 9-bit mode\n");
 665                                         mos7840_port->MsrLsr = 1;
 666                                         wreg = LINE_STATUS_REGISTER;
 667                                         break;
 668                                 case SERIAL_IIR_MS:
 669                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Modem status change\n", i);
 670                                         mos7840_port->MsrLsr = 0;
 671                                         wreg = MODEM_STATUS_REGISTER;
 672                                         break;
 673                                 }
 674                                 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 675                         }
 676                 }
 677         }
 678         if (!(rv < 0))
 679                 /* the completion handler for the control urb will resubmit */
 680                 return;
 681 exit:
 682         result = usb_submit_urb(urb, GFP_ATOMIC);
 683         if (result) {
 684                 dev_err(&urb->dev->dev,
 685                         "%s - Error %d submitting interrupt urb\n",
 686                         __func__, result);
 687         }
 688 }
 689
 690 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 691                                        const char *function)
 692 {
 693         if (!port) {
 694                 pr_debug("%s - port == NULL\n", function);
 695                 return -1;
 696         }
 697         if (!port->serial) {
 698                 pr_debug("%s - port->serial == NULL\n", function);
 699                 return -1;
 700         }
 701
 702         return 0;
 703 }
 704
 705 /* Inline functions to check the sanity of a pointer that is passed to us */
 706 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 707                                          const char *function)
 708 {
 709         if (!serial) {
 710                 pr_debug("%s - serial == NULL\n", function);
 711                 return -1;
 712         }
 713         if (!serial->type) {
 714                 pr_debug("%s - serial->type == NULL!\n", function);
 715                 return -1;
 716         }
 717
 718         return 0;
 719 }
 720
 721 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 722                                                  const char *function)
 723 {
 724         /* if no port was specified, or it fails a paranoia check */
 725         if (!port ||
 726             mos7840_port_paranoia_check(port, function) ||
 727             mos7840_serial_paranoia_check(port->serial, function)) {
 728                 /* then say that we don't have a valid usb_serial thing,
 729                  * which will end up genrating -ENODEV return values */
 730                 return NULL;
 731         }
 732
 733         return port->serial;
 734 }
 735
 736 /*****************************************************************************
 737  * mos7840_bulk_in_callback
 738  *      this is the callback function for when we have received data on the
 739  *      bulk in endpoint.
 740  *****************************************************************************/
 741
 742 static void mos7840_bulk_in_callback(struct urb *urb)
 743 {
 744         int retval;
 745         unsigned char *data;
 746         struct usb_serial *serial;
 747         struct usb_serial_port *port;
 748         struct moschip_port *mos7840_port;
 749         int status = urb->status;
 750
 751         mos7840_port = urb->context;
 752         if (!mos7840_port)
 753                 return;
 754
 755         if (status) {
 756                 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
 757                 mos7840_port->read_urb_busy = false;
 758                 return;
 759         }
 760
 761         port = mos7840_port->port;
 762         if (mos7840_port_paranoia_check(port, __func__)) {
 763                 mos7840_port->read_urb_busy = false;
 764                 return;
 765         }
 766
 767         serial = mos7840_get_usb_serial(port, __func__);
 768         if (!serial) {
 769                 mos7840_port->read_urb_busy = false;
 770                 return;
 771         }
 772
 773         data = urb->transfer_buffer;
 774         usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
 775
 776         if (urb->actual_length) {
 777                 struct tty_port *tport = &mos7840_port->port->port;
 778                 tty_insert_flip_string(tport, data, urb->actual_length);
 779                 tty_flip_buffer_push(tport);
 780                 mos7840_port->icount.rx += urb->actual_length;
 781                 smp_wmb();
 782                 dev_dbg(&port->dev, "mos7840_port->icount.rx is %d:\n", mos7840_port->icount.rx);
 783         }
 784
 785         if (!mos7840_port->read_urb) {
 786                 dev_dbg(&port->dev, "%s", "URB KILLED !!!\n");
 787                 mos7840_port->read_urb_busy = false;
 788                 return;
 789         }
 790
 791         /* Turn on LED */
 792         if (mos7840_port->has_led && !mos7840_port->led_flag) {
 793                 mos7840_port->led_flag = true;
 794                 mos7840_set_led_async(mos7840_port, 0x0301,
 795                                         MODEM_CONTROL_REGISTER);
 796                 mod_timer(&mos7840_port->led_timer1,
 797                                 jiffies + msecs_to_jiffies(LED_ON_MS));
 798         }
 799
 800         mos7840_port->read_urb_busy = true;
 801         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 802
 803         if (retval) {
 804                 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
 805                 mos7840_port->read_urb_busy = false;
 806         }
 807 }
 808
 809 /*****************************************************************************
 810  * mos7840_bulk_out_data_callback
 811  *      this is the callback function for when we have finished sending
 812  *      serial data on the bulk out endpoint.
 813  *****************************************************************************/
 814
 815 static void mos7840_bulk_out_data_callback(struct urb *urb)
 816 {
 817         struct moschip_port *mos7840_port;
 818         struct usb_serial_port *port;
 819         struct tty_struct *tty;
 820         int status = urb->status;
 821         int i;
 822
 823         mos7840_port = urb->context;
 824         port = mos7840_port->port;
 825         spin_lock(&mos7840_port->pool_lock);
 826         for (i = 0; i < NUM_URBS; i++) {
 827                 if (urb == mos7840_port->write_urb_pool[i]) {
 828                         mos7840_port->busy[i] = 0;
 829                         break;
 830                 }
 831         }
 832         spin_unlock(&mos7840_port->pool_lock);
 833
 834         if (status) {
 835                 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
 836                 return;
 837         }
 838
 839         if (mos7840_port_paranoia_check(port, __func__))
 840                 return;
 841
 842         tty = tty_port_tty_get(&port->port);
 843         if (tty && mos7840_port->open)
 844                 tty_wakeup(tty);
 845         tty_kref_put(tty);
 846
 847 }
 848
 849 /************************************************************************/
 850 /*       D R I V E R  T T Y  I N T E R F A C E  F U N C T I O N S       */
 851 /************************************************************************/
 852 #ifdef MCSSerialProbe
 853 static int mos7840_serial_probe(struct usb_serial *serial,
 854                                 const struct usb_device_id *id)
 855 {
 856
 857         /*need to implement the mode_reg reading and updating\
 858            structures usb_serial_ device_type\
 859            (i.e num_ports, num_bulkin,bulkout etc) */
 860         /* Also we can update the changes  attach */
 861         return 1;
 862 }
 863 #endif
 864
 865 /*****************************************************************************
 866  * mos7840_open
 867  *      this function is called by the tty driver when a port is opened
 868  *      If successful, we return 0
 869  *      Otherwise we return a negative error number.
 870  *****************************************************************************/
 871
 872 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
 873 {
 874         int response;
 875         int j;
 876         struct usb_serial *serial;
 877         struct urb *urb;
 878         __u16 Data;
 879         int status;
 880         struct moschip_port *mos7840_port;
 881         struct moschip_port *port0;
 882
 883         if (mos7840_port_paranoia_check(port, __func__))
 884                 return -ENODEV;
 885
 886         serial = port->serial;
 887
 888         if (mos7840_serial_paranoia_check(serial, __func__))
 889                 return -ENODEV;
 890
 891         mos7840_port = mos7840_get_port_private(port);
 892         port0 = mos7840_get_port_private(serial->port[0]);
 893
 894         if (mos7840_port == NULL || port0 == NULL)
 895                 return -ENODEV;
 896
 897         usb_clear_halt(serial->dev, port->write_urb->pipe);
 898         usb_clear_halt(serial->dev, port->read_urb->pipe);
 899         port0->open_ports++;
 900
 901         /* Initialising the write urb pool */
 902         for (j = 0; j < NUM_URBS; ++j) {
 903                 urb = usb_alloc_urb(0, GFP_KERNEL);
 904                 mos7840_port->write_urb_pool[j] = urb;
 905
 906                 if (urb == NULL) {
 907                         dev_err(&port->dev, "No more urbs???\n");
 908                         continue;
 909                 }
 910
 911                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 912                                                                 GFP_KERNEL);
 913                 if (!urb->transfer_buffer) {
 914                         usb_free_urb(urb);
 915                         mos7840_port->write_urb_pool[j] = NULL;
 916                         dev_err(&port->dev,
 917                                 "%s-out of memory for urb buffers.\n",
 918                                 __func__);
 919                         continue;
 920                 }
 921         }
 922
 923 /*****************************************************************************
 924  * Initialize MCS7840 -- Write Init values to corresponding Registers
 925  *
 926  * Register Index
 927  * 1 : IER
 928  * 2 : FCR
 929  * 3 : LCR
 930  * 4 : MCR
 931  *
 932  * 0x08 : SP1/2 Control Reg
 933  *****************************************************************************/
 934
 935         /* NEED to check the following Block */
 936
 937         Data = 0x0;
 938         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 939         if (status < 0) {
 940                 dev_dbg(&port->dev, "Reading Spreg failed\n");
 941                 return -1;
 942         }
 943         Data |= 0x80;
 944         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 945         if (status < 0) {
 946                 dev_dbg(&port->dev, "writing Spreg failed\n");
 947                 return -1;
 948         }
 949
 950         Data &= ~0x80;
 951         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 952         if (status < 0) {
 953                 dev_dbg(&port->dev, "writing Spreg failed\n");
 954                 return -1;
 955         }
 956         /* End of block to be checked */
 957
 958         Data = 0x0;
 959         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 960                                                                         &Data);
 961         if (status < 0) {
 962                 dev_dbg(&port->dev, "Reading Controlreg failed\n");
 963                 return -1;
 964         }
 965         Data |= 0x08;           /* Driver done bit */
 966         Data |= 0x20;           /* rx_disable */
 967         status = mos7840_set_reg_sync(port,
 968                                 mos7840_port->ControlRegOffset, Data);
 969         if (status < 0) {
 970                 dev_dbg(&port->dev, "writing Controlreg failed\n");
 971                 return -1;
 972         }
 973         /* do register settings here */
 974         /* Set all regs to the device default values. */
 975         /***********************************
 976          * First Disable all interrupts.
 977          ***********************************/
 978         Data = 0x00;
 979         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 980         if (status < 0) {
 981                 dev_dbg(&port->dev, "disabling interrupts failed\n");
 982                 return -1;
 983         }
 984         /* Set FIFO_CONTROL_REGISTER to the default value */
 985         Data = 0x00;
 986         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 987         if (status < 0) {
 988                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
 989                 return -1;
 990         }
 991
 992         Data = 0xcf;
 993         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 994         if (status < 0) {
 995                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
 996                 return -1;
 997         }
 998
 999         Data = 0x03;
1000         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1001         mos7840_port->shadowLCR = Data;
1002
1003         Data = 0x0b;
1004         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1005         mos7840_port->shadowMCR = Data;
1006
1007         Data = 0x00;
1008         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1009         mos7840_port->shadowLCR = Data;
1010
1011         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1012         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1013
1014         Data = 0x0c;
1015         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1016
1017         Data = 0x0;
1018         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1019
1020         Data = 0x00;
1021         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1022
1023         Data = Data & ~SERIAL_LCR_DLAB;
1024         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1025         mos7840_port->shadowLCR = Data;
1026
1027         /* clearing Bulkin and Bulkout Fifo */
1028         Data = 0x0;
1029         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1030
1031         Data = Data | 0x0c;
1032         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1033
1034         Data = Data & ~0x0c;
1035         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1036         /* Finally enable all interrupts */
1037         Data = 0x0c;
1038         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1039
1040         /* clearing rx_disable */
1041         Data = 0x0;
1042         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1043                                                                         &Data);
1044         Data = Data & ~0x20;
1045         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1046                                                                         Data);
1047
1048         /* rx_negate */
1049         Data = 0x0;
1050         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1051                                                                         &Data);
1052         Data = Data | 0x10;
1053         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1054                                                                         Data);
1055
1056         /* Check to see if we've set up our endpoint info yet    *
1057          * (can't set it up in mos7840_startup as the structures *
1058          * were not set up at that time.)                        */
1059         if (port0->open_ports == 1) {
1060                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1061                         /* set up interrupt urb */
1062                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1063                                 serial->dev,
1064                                 usb_rcvintpipe(serial->dev,
1065                                 serial->port[0]->interrupt_in_endpointAddress),
1066                                 serial->port[0]->interrupt_in_buffer,
1067                                 serial->port[0]->interrupt_in_urb->
1068                                 transfer_buffer_length,
1069                                 mos7840_interrupt_callback,
1070                                 serial,
1071                                 serial->port[0]->interrupt_in_urb->interval);
1072
1073                         /* start interrupt read for mos7840               *
1074                          * will continue as long as mos7840 is connected  */
1075
1076                         response =
1077                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1078                                            GFP_KERNEL);
1079                         if (response) {
1080                                 dev_err(&port->dev, "%s - Error %d submitting "
1081                                         "interrupt urb\n", __func__, response);
1082                         }
1083
1084                 }
1085
1086         }
1087
1088         /* see if we've set up our endpoint info yet   *
1089          * (can't set it up in mos7840_startup as the  *
1090          * structures were not set up at that time.)   */
1091
1092         dev_dbg(&port->dev, "port number is %d\n", port->number);
1093         dev_dbg(&port->dev, "serial number is %d\n", port->serial->minor);
1094         dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
1095         dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
1096         dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
1097         dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
1098         mos7840_port->read_urb = port->read_urb;
1099
1100         /* set up our bulk in urb */
1101         if ((serial->num_ports == 2)
1102                 && ((((__u16)port->number -
1103                         (__u16)(port->serial->minor)) % 2) != 0)) {
1104                 usb_fill_bulk_urb(mos7840_port->read_urb,
1105                         serial->dev,
1106                         usb_rcvbulkpipe(serial->dev,
1107                                 (port->bulk_in_endpointAddress) + 2),
1108                         port->bulk_in_buffer,
1109                         mos7840_port->read_urb->transfer_buffer_length,
1110                         mos7840_bulk_in_callback, mos7840_port);
1111         } else {
1112                 usb_fill_bulk_urb(mos7840_port->read_urb,
1113                         serial->dev,
1114                         usb_rcvbulkpipe(serial->dev,
1115                                 port->bulk_in_endpointAddress),
1116                         port->bulk_in_buffer,
1117                         mos7840_port->read_urb->transfer_buffer_length,
1118                         mos7840_bulk_in_callback, mos7840_port);
1119         }
1120
1121         dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
1122         mos7840_port->read_urb_busy = true;
1123         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1124         if (response) {
1125                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1126                         __func__, response);
1127                 mos7840_port->read_urb_busy = false;
1128         }
1129
1130         /* initialize our wait queues */
1131         init_waitqueue_head(&mos7840_port->wait_chase);
1132
1133         /* initialize our icount structure */
1134         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1135
1136         /* initialize our port settings */
1137         /* Must set to enable ints! */
1138         mos7840_port->shadowMCR = MCR_MASTER_IE;
1139         /* send a open port command */
1140         mos7840_port->open = 1;
1141         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1142         mos7840_port->icount.tx = 0;
1143         mos7840_port->icount.rx = 0;
1144
1145         return 0;
1146 }
1147
1148 /*****************************************************************************
1149  * mos7840_chars_in_buffer
1150  *      this function is called by the tty driver when it wants to know how many
1151  *      bytes of data we currently have outstanding in the port (data that has
1152  *      been written, but hasn't made it out the port yet)
1153  *      If successful, we return the number of bytes left to be written in the
1154  *      system,
1155  *      Otherwise we return zero.
1156  *****************************************************************************/
1157
1158 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1159 {
1160         struct usb_serial_port *port = tty->driver_data;
1161         int i;
1162         int chars = 0;
1163         unsigned long flags;
1164         struct moschip_port *mos7840_port;
1165
1166         if (mos7840_port_paranoia_check(port, __func__))
1167                 return 0;
1168
1169         mos7840_port = mos7840_get_port_private(port);
1170         if (mos7840_port == NULL)
1171                 return 0;
1172
1173         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1174         for (i = 0; i < NUM_URBS; ++i) {
1175                 if (mos7840_port->busy[i]) {
1176                         struct urb *urb = mos7840_port->write_urb_pool[i];
1177                         chars += urb->transfer_buffer_length;
1178                 }
1179         }
1180         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1181         dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1182         return chars;
1183
1184 }
1185
1186 /*****************************************************************************
1187  * mos7840_close
1188  *      this function is called by the tty driver when a port is closed
1189  *****************************************************************************/
1190
1191 static void mos7840_close(struct usb_serial_port *port)
1192 {
1193         struct usb_serial *serial;
1194         struct moschip_port *mos7840_port;
1195         struct moschip_port *port0;
1196         int j;
1197         __u16 Data;
1198
1199         if (mos7840_port_paranoia_check(port, __func__))
1200                 return;
1201
1202         serial = mos7840_get_usb_serial(port, __func__);
1203         if (!serial)
1204                 return;
1205
1206         mos7840_port = mos7840_get_port_private(port);
1207         port0 = mos7840_get_port_private(serial->port[0]);
1208
1209         if (mos7840_port == NULL || port0 == NULL)
1210                 return;
1211
1212         for (j = 0; j < NUM_URBS; ++j)
1213                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1214
1215         /* Freeing Write URBs */
1216         for (j = 0; j < NUM_URBS; ++j) {
1217                 if (mos7840_port->write_urb_pool[j]) {
1218                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1219                                 kfree(mos7840_port->write_urb_pool[j]->
1220                                       transfer_buffer);
1221
1222                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1223                 }
1224         }
1225
1226         /* While closing port, shutdown all bulk read, write  *
1227          * and interrupt read if they exists                  */
1228         if (serial->dev) {
1229                 if (mos7840_port->write_urb) {
1230                         dev_dbg(&port->dev, "%s", "Shutdown bulk write\n");
1231                         usb_kill_urb(mos7840_port->write_urb);
1232                 }
1233                 if (mos7840_port->read_urb) {
1234                         dev_dbg(&port->dev, "%s", "Shutdown bulk read\n");
1235                         usb_kill_urb(mos7840_port->read_urb);
1236                         mos7840_port->read_urb_busy = false;
1237                 }
1238                 if ((&mos7840_port->control_urb)) {
1239                         dev_dbg(&port->dev, "%s", "Shutdown control read\n");
1240                         /*/      usb_kill_urb (mos7840_port->control_urb); */
1241                 }
1242         }
1243 /*      if(mos7840_port->ctrl_buf != NULL) */
1244 /*              kfree(mos7840_port->ctrl_buf); */
1245         port0->open_ports--;
1246         dev_dbg(&port->dev, "%s in close%d:in port%d\n", __func__, port0->open_ports, port->number);
1247         if (port0->open_ports == 0) {
1248                 if (serial->port[0]->interrupt_in_urb) {
1249                         dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n");
1250                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1251                 }
1252         }
1253
1254         if (mos7840_port->write_urb) {
1255                 /* if this urb had a transfer buffer already (old tx) free it */
1256                 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         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
2021                 mos7840_port->shadowLCR);
2022 }
2023
2024 /*****************************************************************************
2025  * mos7840_set_termios
2026  *      this function is called by the tty driver when it wants to change
2027  *      the termios structure
2028  *****************************************************************************/
2029
2030 static void mos7840_set_termios(struct tty_struct *tty,
2031                                 struct usb_serial_port *port,
2032                                 struct ktermios *old_termios)
2033 {
2034         int status;
2035         unsigned int cflag;
2036         struct usb_serial *serial;
2037         struct moschip_port *mos7840_port;
2038
2039         if (mos7840_port_paranoia_check(port, __func__))
2040                 return;
2041
2042         serial = port->serial;
2043
2044         if (mos7840_serial_paranoia_check(serial, __func__))
2045                 return;
2046
2047         mos7840_port = mos7840_get_port_private(port);
2048
2049         if (mos7840_port == NULL)
2050                 return;
2051
2052         if (!mos7840_port->open) {
2053                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
2054                 return;
2055         }
2056
2057         dev_dbg(&port->dev, "%s", "setting termios - \n");
2058
2059         cflag = tty->termios.c_cflag;
2060
2061         dev_dbg(&port->dev, "%s - clfag %08x iflag %08x\n", __func__,
2062                 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
2063         dev_dbg(&port->dev, "%s - old clfag %08x old iflag %08x\n", __func__,
2064                 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2065         dev_dbg(&port->dev, "%s - port %d\n", __func__, port->number);
2066
2067         /* change the port settings to the new ones specified */
2068
2069         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2070
2071         if (!mos7840_port->read_urb) {
2072                 dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n");
2073                 return;
2074         }
2075
2076         if (mos7840_port->read_urb_busy == false) {
2077                 mos7840_port->read_urb_busy = true;
2078                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2079                 if (status) {
2080                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
2081                             status);
2082                         mos7840_port->read_urb_busy = false;
2083                 }
2084         }
2085 }
2086
2087 /*****************************************************************************
2088  * mos7840_get_lsr_info - get line status register info
2089  *
2090  * Purpose: Let user call ioctl() to get info when the UART physically
2091  *          is emptied.  On bus types like RS485, the transmitter must
2092  *          release the bus after transmitting. This must be done when
2093  *          the transmit shift register is empty, not be done when the
2094  *          transmit holding register is empty.  This functionality
2095  *          allows an RS485 driver to be written in user space.
2096  *****************************************************************************/
2097
2098 static int mos7840_get_lsr_info(struct tty_struct *tty,
2099                                 unsigned int __user *value)
2100 {
2101         int count;
2102         unsigned int result = 0;
2103
2104         count = mos7840_chars_in_buffer(tty);
2105         if (count == 0)
2106                 result = TIOCSER_TEMT;
2107
2108         if (copy_to_user(value, &result, sizeof(int)))
2109                 return -EFAULT;
2110         return 0;
2111 }
2112
2113 /*****************************************************************************
2114  * mos7840_get_serial_info
2115  *      function to get information about serial port
2116  *****************************************************************************/
2117
2118 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2119                                    struct serial_struct __user *retinfo)
2120 {
2121         struct serial_struct tmp;
2122
2123         if (mos7840_port == NULL)
2124                 return -1;
2125
2126         if (!retinfo)
2127                 return -EFAULT;
2128
2129         memset(&tmp, 0, sizeof(tmp));
2130
2131         tmp.type = PORT_16550A;
2132         tmp.line = mos7840_port->port->serial->minor;
2133         tmp.port = mos7840_port->port->number;
2134         tmp.irq = 0;
2135         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2136         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2137         tmp.baud_base = 9600;
2138         tmp.close_delay = 5 * HZ;
2139         tmp.closing_wait = 30 * HZ;
2140
2141         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2142                 return -EFAULT;
2143         return 0;
2144 }
2145
2146 static int mos7840_get_icount(struct tty_struct *tty,
2147                         struct serial_icounter_struct *icount)
2148 {
2149         struct usb_serial_port *port = tty->driver_data;
2150         struct moschip_port *mos7840_port;
2151         struct async_icount cnow;
2152
2153         mos7840_port = mos7840_get_port_private(port);
2154         cnow = mos7840_port->icount;
2155
2156         smp_rmb();
2157         icount->cts = cnow.cts;
2158         icount->dsr = cnow.dsr;
2159         icount->rng = cnow.rng;
2160         icount->dcd = cnow.dcd;
2161         icount->rx = cnow.rx;
2162         icount->tx = cnow.tx;
2163         icount->frame = cnow.frame;
2164         icount->overrun = cnow.overrun;
2165         icount->parity = cnow.parity;
2166         icount->brk = cnow.brk;
2167         icount->buf_overrun = cnow.buf_overrun;
2168
2169         dev_dbg(&port->dev, "%s TIOCGICOUNT RX=%d, TX=%d\n", __func__,
2170                 icount->rx, icount->tx);
2171         return 0;
2172 }
2173
2174 /*****************************************************************************
2175  * SerialIoctl
2176  *      this function handles any ioctl calls to the driver
2177  *****************************************************************************/
2178
2179 static int mos7840_ioctl(struct tty_struct *tty,
2180                          unsigned int cmd, unsigned long arg)
2181 {
2182         struct usb_serial_port *port = tty->driver_data;
2183         void __user *argp = (void __user *)arg;
2184         struct moschip_port *mos7840_port;
2185
2186         struct async_icount cnow;
2187         struct async_icount cprev;
2188
2189         if (mos7840_port_paranoia_check(port, __func__))
2190                 return -1;
2191
2192         mos7840_port = mos7840_get_port_private(port);
2193
2194         if (mos7840_port == NULL)
2195                 return -1;
2196
2197         dev_dbg(&port->dev, "%s - cmd = 0x%x\n", __func__, cmd);
2198
2199         switch (cmd) {
2200                 /* return number of bytes available */
2201
2202         case TIOCSERGETLSR:
2203                 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
2204                 return mos7840_get_lsr_info(tty, argp);
2205
2206         case TIOCGSERIAL:
2207                 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
2208                 return mos7840_get_serial_info(mos7840_port, argp);
2209
2210         case TIOCSSERIAL:
2211                 dev_dbg(&port->dev, "%s TIOCSSERIAL\n", __func__);
2212                 break;
2213
2214         case TIOCMIWAIT:
2215                 dev_dbg(&port->dev, "%s  TIOCMIWAIT\n", __func__);
2216                 cprev = mos7840_port->icount;
2217                 while (1) {
2218                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2219                         mos7840_port->delta_msr_cond = 0;
2220                         wait_event_interruptible(port->delta_msr_wait,
2221                                                  (port->serial->disconnected ||
2222                                                   mos7840_port->
2223                                                   delta_msr_cond == 1));
2224
2225                         /* see if a signal did it */
2226                         if (signal_pending(current))
2227                                 return -ERESTARTSYS;
2228
2229                         if (port->serial->disconnected)
2230                                 return -EIO;
2231
2232                         cnow = mos7840_port->icount;
2233                         smp_rmb();
2234                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2235                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2236                                 return -EIO;    /* no change => error */
2237                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2238                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2239                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2240                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2241                                 return 0;
2242                         }
2243                         cprev = cnow;
2244                 }
2245                 /* NOTREACHED */
2246                 break;
2247
2248         default:
2249                 break;
2250         }
2251         return -ENOIOCTLCMD;
2252 }
2253
2254 static int mos7810_check(struct usb_serial *serial)
2255 {
2256         int i, pass_count = 0;
2257         __u16 data = 0, mcr_data = 0;
2258         __u16 test_pattern = 0x55AA;
2259
2260         /* Store MCR setting */
2261         usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2262                 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
2263                 &mcr_data, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2264
2265         for (i = 0; i < 16; i++) {
2266                 /* Send the 1-bit test pattern out to MCS7810 test pin */
2267                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2268                         MCS_WRREQ, MCS_WR_RTYPE,
2269                         (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
2270                         MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
2271
2272                 /* Read the test pattern back */
2273                 usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2274                         MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &data,
2275                         VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2276
2277                 /* If this is a MCS7810 device, both test patterns must match */
2278                 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
2279                         break;
2280
2281                 pass_count++;
2282         }
2283
2284         /* Restore MCR setting */
2285         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
2286                 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
2287                 0, MOS_WDR_TIMEOUT);
2288
2289         if (pass_count == 16)
2290                 return 1;
2291
2292         return 0;
2293 }
2294
2295 static int mos7840_calc_num_ports(struct usb_serial *serial)
2296 {
2297         __u16 data = 0x00;
2298         int mos7840_num_ports;
2299
2300         usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2301                 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &data,
2302                 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2303
2304         if (serial->dev->descriptor.idProduct == MOSCHIP_DEVICE_ID_7810 ||
2305                 serial->dev->descriptor.idProduct == MOSCHIP_DEVICE_ID_7820) {
2306                 device_type = serial->dev->descriptor.idProduct;
2307         } else {
2308                 /* For a MCS7840 device GPIO0 must be set to 1 */
2309                 if ((data & 0x01) == 1)
2310                         device_type = MOSCHIP_DEVICE_ID_7840;
2311                 else if (mos7810_check(serial))
2312                         device_type = MOSCHIP_DEVICE_ID_7810;
2313                 else
2314                         device_type = MOSCHIP_DEVICE_ID_7820;
2315         }
2316
2317         mos7840_num_ports = (device_type >> 4) & 0x000F;
2318         serial->num_bulk_in = mos7840_num_ports;
2319         serial->num_bulk_out = mos7840_num_ports;
2320         serial->num_ports = mos7840_num_ports;
2321
2322         return mos7840_num_ports;
2323 }
2324
2325 static int mos7840_port_probe(struct usb_serial_port *port)
2326 {
2327         struct usb_serial *serial = port->serial;
2328         struct moschip_port *mos7840_port;
2329         int status;
2330         int pnum;
2331         __u16 Data;
2332
2333         /* we set up the pointers to the endpoints in the mos7840_open *
2334          * function, as the structures aren't created yet.             */
2335
2336         pnum = port->number - serial->minor;
2337
2338         dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
2339         mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2340         if (mos7840_port == NULL) {
2341                 dev_err(&port->dev, "%s - Out of memory\n", __func__);
2342                 return -ENOMEM;
2343         }
2344
2345         /* Initialize all port interrupt end point to port 0 int
2346          * endpoint. Our device has only one interrupt end point
2347          * common to all port */
2348
2349         mos7840_port->port = port;
2350         mos7840_set_port_private(port, mos7840_port);
2351         spin_lock_init(&mos7840_port->pool_lock);
2352
2353         /* minor is not initialised until later by
2354          * usb-serial.c:get_free_serial() and cannot therefore be used
2355          * to index device instances */
2356         mos7840_port->port_num = pnum + 1;
2357         dev_dbg(&port->dev, "port->number = %d\n", port->number);
2358         dev_dbg(&port->dev, "port->serial->minor = %d\n", port->serial->minor);
2359         dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
2360         dev_dbg(&port->dev, "serial->minor = %d\n", serial->minor);
2361
2362         if (mos7840_port->port_num == 1) {
2363                 mos7840_port->SpRegOffset = 0x0;
2364                 mos7840_port->ControlRegOffset = 0x1;
2365                 mos7840_port->DcrRegOffset = 0x4;
2366         } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 4)) {
2367                 mos7840_port->SpRegOffset = 0x8;
2368                 mos7840_port->ControlRegOffset = 0x9;
2369                 mos7840_port->DcrRegOffset = 0x16;
2370         } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 2)) {
2371                 mos7840_port->SpRegOffset = 0xa;
2372                 mos7840_port->ControlRegOffset = 0xb;
2373                 mos7840_port->DcrRegOffset = 0x19;
2374         } else if ((mos7840_port->port_num == 3) && (serial->num_ports == 4)) {
2375                 mos7840_port->SpRegOffset = 0xa;
2376                 mos7840_port->ControlRegOffset = 0xb;
2377                 mos7840_port->DcrRegOffset = 0x19;
2378         } else if ((mos7840_port->port_num == 4) && (serial->num_ports == 4)) {
2379                 mos7840_port->SpRegOffset = 0xc;
2380                 mos7840_port->ControlRegOffset = 0xd;
2381                 mos7840_port->DcrRegOffset = 0x1c;
2382         }
2383         mos7840_dump_serial_port(port, mos7840_port);
2384         mos7840_set_port_private(port, mos7840_port);
2385
2386         /* enable rx_disable bit in control register */
2387         status = mos7840_get_reg_sync(port,
2388                         mos7840_port->ControlRegOffset, &Data);
2389         if (status < 0) {
2390                 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
2391                 goto out;
2392         } else
2393                 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
2394         Data |= 0x08;   /* setting driver done bit */
2395         Data |= 0x04;   /* sp1_bit to have cts change reflect in
2396                            modem status reg */
2397
2398         /* Data |= 0x20; //rx_disable bit */
2399         status = mos7840_set_reg_sync(port,
2400                         mos7840_port->ControlRegOffset, Data);
2401         if (status < 0) {
2402                 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2403                 goto out;
2404         } else
2405                 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
2406
2407         /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2408            and 0x24 in DCR3 */
2409         Data = 0x01;
2410         status = mos7840_set_reg_sync(port,
2411                         (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2412         if (status < 0) {
2413                 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
2414                 goto out;
2415         } else
2416                 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
2417
2418         Data = 0x05;
2419         status = mos7840_set_reg_sync(port,
2420                         (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2421         if (status < 0) {
2422                 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
2423                 goto out;
2424         } else
2425                 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
2426
2427         Data = 0x24;
2428         status = mos7840_set_reg_sync(port,
2429                         (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2430         if (status < 0) {
2431                 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
2432                 goto out;
2433         } else
2434                 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
2435
2436         /* write values in clkstart0x0 and clkmulti 0x20 */
2437         Data = 0x0;
2438         status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
2439         if (status < 0) {
2440                 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2441                 goto out;
2442         } else
2443                 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2444
2445         Data = 0x20;
2446         status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
2447         if (status < 0) {
2448                 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
2449                 goto error;
2450         } else
2451                 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
2452
2453         /* write value 0x0 to scratchpad register */
2454         Data = 0x00;
2455         status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
2456         if (status < 0) {
2457                 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
2458                 goto out;
2459         } else
2460                 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
2461
2462         /* Zero Length flag register */
2463         if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
2464                 Data = 0xff;
2465                 status = mos7840_set_reg_sync(port,
2466                                 (__u16) (ZLP_REG1 +
2467                                         ((__u16)mos7840_port->port_num)), Data);
2468                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2469                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
2470                 if (status < 0) {
2471                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
2472                         goto out;
2473                 } else
2474                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
2475         } else {
2476                 Data = 0xff;
2477                 status = mos7840_set_reg_sync(port,
2478                                 (__u16) (ZLP_REG1 +
2479                                         ((__u16)mos7840_port->port_num) - 0x1), Data);
2480                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2481                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
2482                 if (status < 0) {
2483                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
2484                         goto out;
2485                 } else
2486                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
2487
2488         }
2489         mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2490         mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2491         mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2492                         GFP_KERNEL);
2493         if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2494                         !mos7840_port->dr) {
2495                 status = -ENOMEM;
2496                 goto error;
2497         }
2498
2499         mos7840_port->has_led = false;
2500
2501         /* Initialize LED timers */
2502         if (device_type == MOSCHIP_DEVICE_ID_7810) {
2503                 mos7840_port->has_led = true;
2504
2505                 init_timer(&mos7840_port->led_timer1);
2506                 mos7840_port->led_timer1.function = mos7840_led_off;
2507                 mos7840_port->led_timer1.expires =
2508                         jiffies + msecs_to_jiffies(LED_ON_MS);
2509                 mos7840_port->led_timer1.data = (unsigned long)mos7840_port;
2510
2511                 init_timer(&mos7840_port->led_timer2);
2512                 mos7840_port->led_timer2.function = mos7840_led_flag_off;
2513                 mos7840_port->led_timer2.expires =
2514                         jiffies + msecs_to_jiffies(LED_OFF_MS);
2515                 mos7840_port->led_timer2.data = (unsigned long)mos7840_port;
2516
2517                 mos7840_port->led_flag = false;
2518
2519                 /* Turn off LED */
2520                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2521         }
2522 out:
2523         if (pnum == serial->num_ports - 1) {
2524                 /* Zero Length flag enable */
2525                 Data = 0x0f;
2526                 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2527                 if (status < 0) {
2528                         dev_dbg(&port->dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
2529                         goto error;
2530                 } else
2531                         dev_dbg(&port->dev, "ZLP_REG5 Writing success status%d\n", status);
2532
2533                 /* setting configuration feature to one */
2534                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2535                                 0x03, 0x00, 0x01, 0x00, NULL, 0x00,
2536                                 MOS_WDR_TIMEOUT);
2537         }
2538         return 0;
2539 error:
2540         kfree(mos7840_port->dr);
2541         kfree(mos7840_port->ctrl_buf);
2542         usb_free_urb(mos7840_port->control_urb);
2543         kfree(mos7840_port);
2544
2545         return status;
2546 }
2547
2548 static int mos7840_port_remove(struct usb_serial_port *port)
2549 {
2550         struct moschip_port *mos7840_port;
2551
2552         mos7840_port = mos7840_get_port_private(port);
2553
2554         if (mos7840_port->has_led) {
2555                 /* Turn off LED */
2556                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2557
2558                 del_timer_sync(&mos7840_port->led_timer1);
2559                 del_timer_sync(&mos7840_port->led_timer2);
2560         }
2561         usb_kill_urb(mos7840_port->control_urb);
2562         usb_free_urb(mos7840_port->control_urb);
2563         kfree(mos7840_port->ctrl_buf);
2564         kfree(mos7840_port->dr);
2565         kfree(mos7840_port);
2566
2567         return 0;
2568 }
2569
2570 static struct usb_serial_driver moschip7840_4port_device = {
2571         .driver = {
2572                    .owner = THIS_MODULE,
2573                    .name = "mos7840",
2574                    },
2575         .description = DRIVER_DESC,
2576         .id_table = id_table,
2577         .num_ports = 4,
2578         .open = mos7840_open,
2579         .close = mos7840_close,
2580         .write = mos7840_write,
2581         .write_room = mos7840_write_room,
2582         .chars_in_buffer = mos7840_chars_in_buffer,
2583         .throttle = mos7840_throttle,
2584         .unthrottle = mos7840_unthrottle,
2585         .calc_num_ports = mos7840_calc_num_ports,
2586 #ifdef MCSSerialProbe
2587         .probe = mos7840_serial_probe,
2588 #endif
2589         .ioctl = mos7840_ioctl,
2590         .set_termios = mos7840_set_termios,
2591         .break_ctl = mos7840_break,
2592         .tiocmget = mos7840_tiocmget,
2593         .tiocmset = mos7840_tiocmset,
2594         .get_icount = mos7840_get_icount,
2595         .port_probe = mos7840_port_probe,
2596         .port_remove = mos7840_port_remove,
2597         .read_bulk_callback = mos7840_bulk_in_callback,
2598         .read_int_callback = mos7840_interrupt_callback,
2599 };
2600
2601 static struct usb_serial_driver * const serial_drivers[] = {
2602         &moschip7840_4port_device, NULL
2603 };
2604
2605 module_usb_serial_driver(serial_drivers, id_table);
2606
2607 MODULE_DESCRIPTION(DRIVER_DESC);
2608 MODULE_LICENSE("GPL");