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 enum mos7840_flag {
 187         MOS7840_FLAG_CTRL_BUSY,
 188         MOS7840_FLAG_LED_BUSY,
 189 };
 190
 191 static const struct usb_device_id id_table[] = {
 192         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 193         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 194         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
 195         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
 196         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
 197         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 198         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
 199         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 200         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 201         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 202         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 203         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 204         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
 205         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 206         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
 207         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
 208         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 209         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 210         {}                      /* terminating entry */
 211 };
 212 MODULE_DEVICE_TABLE(usb, id_table);
 213
 214 /* This structure holds all of the local port information */
 215
 216 struct moschip_port {
 217         int port_num;           /*Actual port number in the device(1,2,etc) */
 218         struct urb *write_urb;  /* write URB for this port */
 219         struct urb *read_urb;   /* read URB for this port */
 220         __u8 shadowLCR;         /* last LCR value received */
 221         __u8 shadowMCR;         /* last MCR value received */
 222         char open;
 223         char open_ports;
 224         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 225         struct usb_serial_port *port;   /* loop back to the owner of this object */
 226
 227         /* Offsets */
 228         __u8 SpRegOffset;
 229         __u8 ControlRegOffset;
 230         __u8 DcrRegOffset;
 231         /* for processing control URBS in interrupt context */
 232         struct urb *control_urb;
 233         struct usb_ctrlrequest *dr;
 234         char *ctrl_buf;
 235         int MsrLsr;
 236
 237         spinlock_t pool_lock;
 238         struct urb *write_urb_pool[NUM_URBS];
 239         char busy[NUM_URBS];
 240         bool read_urb_busy;
 241
 242         /* For device(s) with LED indicator */
 243         bool has_led;
 244         struct timer_list led_timer1;   /* Timer for LED on */
 245         struct timer_list led_timer2;   /* Timer for LED off */
 246         struct urb *led_urb;
 247         struct usb_ctrlrequest *led_dr;
 248
 249         unsigned long flags;
 250 };
 251
 252 /*
 253  * mos7840_set_reg_sync
 254  *      To set the Control register by calling usb_fill_control_urb function
 255  *      by passing usb_sndctrlpipe function as parameter.
 256  */
 257
 258 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 259                                 __u16 val)
 260 {
 261         struct usb_device *dev = port->serial->dev;
 262         val = val & 0x00ff;
 263         dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
 264
 265         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 266                                MCS_WR_RTYPE, val, reg, NULL, 0,
 267                                MOS_WDR_TIMEOUT);
 268 }
 269
 270 /*
 271  * mos7840_get_reg_sync
 272  *      To set the Uart register by calling usb_fill_control_urb function by
 273  *      passing usb_rcvctrlpipe function as parameter.
 274  */
 275
 276 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 277                                 __u16 *val)
 278 {
 279         struct usb_device *dev = port->serial->dev;
 280         int ret = 0;
 281         u8 *buf;
 282
 283         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 284         if (!buf)
 285                 return -ENOMEM;
 286
 287         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 288                               MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
 289                               MOS_WDR_TIMEOUT);
 290         *val = buf[0];
 291         dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
 292
 293         kfree(buf);
 294         return ret;
 295 }
 296
 297 /*
 298  * mos7840_set_uart_reg
 299  *      To set the Uart register by calling usb_fill_control_urb function by
 300  *      passing usb_sndctrlpipe function as parameter.
 301  */
 302
 303 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 304                                 __u16 val)
 305 {
 306
 307         struct usb_device *dev = port->serial->dev;
 308         val = val & 0x00ff;
 309         /* For the UART control registers, the application number need
 310            to be Or'ed */
 311         if (port->serial->num_ports == 4) {
 312                 val |= ((__u16)port->port_number + 1) << 8;
 313         } else {
 314                 if (port->port_number == 0) {
 315                         val |= ((__u16)port->port_number + 1) << 8;
 316                 } else {
 317                         val |= ((__u16)port->port_number + 2) << 8;
 318                 }
 319         }
 320         dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
 321         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 322                                MCS_WR_RTYPE, val, reg, NULL, 0,
 323                                MOS_WDR_TIMEOUT);
 324
 325 }
 326
 327 /*
 328  * mos7840_get_uart_reg
 329  *      To set the Control register by calling usb_fill_control_urb function
 330  *      by passing usb_rcvctrlpipe function as parameter.
 331  */
 332 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 333                                 __u16 *val)
 334 {
 335         struct usb_device *dev = port->serial->dev;
 336         int ret = 0;
 337         __u16 Wval;
 338         u8 *buf;
 339
 340         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 341         if (!buf)
 342                 return -ENOMEM;
 343
 344         /* Wval  is same as application number */
 345         if (port->serial->num_ports == 4) {
 346                 Wval = ((__u16)port->port_number + 1) << 8;
 347         } else {
 348                 if (port->port_number == 0) {
 349                         Wval = ((__u16)port->port_number + 1) << 8;
 350                 } else {
 351                         Wval = ((__u16)port->port_number + 2) << 8;
 352                 }
 353         }
 354         dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
 355         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 356                               MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
 357                               MOS_WDR_TIMEOUT);
 358         *val = buf[0];
 359
 360         kfree(buf);
 361         return ret;
 362 }
 363
 364 static void mos7840_dump_serial_port(struct usb_serial_port *port,
 365                                      struct moschip_port *mos7840_port)
 366 {
 367
 368         dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
 369         dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
 370         dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
 371
 372 }
 373
 374 /************************************************************************/
 375 /************************************************************************/
 376 /*             I N T E R F A C E   F U N C T I O N S                    */
 377 /*             I N T E R F A C E   F U N C T I O N S                    */
 378 /************************************************************************/
 379 /************************************************************************/
 380
 381 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 382                                             struct moschip_port *data)
 383 {
 384         usb_set_serial_port_data(port, (void *)data);
 385 }
 386
 387 static inline struct moschip_port *mos7840_get_port_private(struct
 388                                                             usb_serial_port
 389                                                             *port)
 390 {
 391         return (struct moschip_port *)usb_get_serial_port_data(port);
 392 }
 393
 394 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 395 {
 396         struct moschip_port *mos7840_port;
 397         struct async_icount *icount;
 398         mos7840_port = port;
 399         if (new_msr &
 400             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 401              MOS_MSR_DELTA_CD)) {
 402                 icount = &mos7840_port->port->icount;
 403
 404                 /* update input line counters */
 405                 if (new_msr & MOS_MSR_DELTA_CTS)
 406                         icount->cts++;
 407                 if (new_msr & MOS_MSR_DELTA_DSR)
 408                         icount->dsr++;
 409                 if (new_msr & MOS_MSR_DELTA_CD)
 410                         icount->dcd++;
 411                 if (new_msr & MOS_MSR_DELTA_RI)
 412                         icount->rng++;
 413
 414                 wake_up_interruptible(&port->port->port.delta_msr_wait);
 415         }
 416 }
 417
 418 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 419 {
 420         struct async_icount *icount;
 421
 422         if (new_lsr & SERIAL_LSR_BI) {
 423                 /*
 424                  * Parity and Framing errors only count if they
 425                  * occur exclusive of a break being
 426                  * received.
 427                  */
 428                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 429         }
 430
 431         /* update input line counters */
 432         icount = &port->port->icount;
 433         if (new_lsr & SERIAL_LSR_BI)
 434                 icount->brk++;
 435         if (new_lsr & SERIAL_LSR_OE)
 436                 icount->overrun++;
 437         if (new_lsr & SERIAL_LSR_PE)
 438                 icount->parity++;
 439         if (new_lsr & SERIAL_LSR_FE)
 440                 icount->frame++;
 441 }
 442
 443 /************************************************************************/
 444 /************************************************************************/
 445 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 446 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 447 /************************************************************************/
 448 /************************************************************************/
 449
 450 static void mos7840_control_callback(struct urb *urb)
 451 {
 452         unsigned char *data;
 453         struct moschip_port *mos7840_port;
 454         struct device *dev = &urb->dev->dev;
 455         __u8 regval = 0x0;
 456         int status = urb->status;
 457
 458         mos7840_port = urb->context;
 459
 460         switch (status) {
 461         case 0:
 462                 /* success */
 463                 break;
 464         case -ECONNRESET:
 465         case -ENOENT:
 466         case -ESHUTDOWN:
 467                 /* this urb is terminated, clean up */
 468                 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
 469                 goto out;
 470         default:
 471                 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
 472                 goto out;
 473         }
 474
 475         dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length);
 476         dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__,
 477                 mos7840_port->MsrLsr, mos7840_port->port_num);
 478         data = urb->transfer_buffer;
 479         regval = (__u8) data[0];
 480         dev_dbg(dev, "%s data is %x\n", __func__, regval);
 481         if (mos7840_port->MsrLsr == 0)
 482                 mos7840_handle_new_msr(mos7840_port, regval);
 483         else if (mos7840_port->MsrLsr == 1)
 484                 mos7840_handle_new_lsr(mos7840_port, regval);
 485 out:
 486         clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mos7840_port->flags);
 487 }
 488
 489 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 490                            __u16 *val)
 491 {
 492         struct usb_device *dev = mcs->port->serial->dev;
 493         struct usb_ctrlrequest *dr = mcs->dr;
 494         unsigned char *buffer = mcs->ctrl_buf;
 495         int ret;
 496
 497         if (test_and_set_bit_lock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags))
 498                 return -EBUSY;
 499
 500         dr->bRequestType = MCS_RD_RTYPE;
 501         dr->bRequest = MCS_RDREQ;
 502         dr->wValue = cpu_to_le16(Wval); /* 0 */
 503         dr->wIndex = cpu_to_le16(reg);
 504         dr->wLength = cpu_to_le16(2);
 505
 506         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 507                              (unsigned char *)dr, buffer, 2,
 508                              mos7840_control_callback, mcs);
 509         mcs->control_urb->transfer_buffer_length = 2;
 510         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 511         if (ret)
 512                 clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags);
 513
 514         return ret;
 515 }
 516
 517 static void mos7840_set_led_callback(struct urb *urb)
 518 {
 519         switch (urb->status) {
 520         case 0:
 521                 /* Success */
 522                 break;
 523         case -ECONNRESET:
 524         case -ENOENT:
 525         case -ESHUTDOWN:
 526                 /* This urb is terminated, clean up */
 527                 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d",
 528                         __func__, urb->status);
 529                 break;
 530         default:
 531                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d",
 532                         __func__, urb->status);
 533         }
 534 }
 535
 536 static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
 537                                 __u16 reg)
 538 {
 539         struct usb_device *dev = mcs->port->serial->dev;
 540         struct usb_ctrlrequest *dr = mcs->led_dr;
 541
 542         dr->bRequestType = MCS_WR_RTYPE;
 543         dr->bRequest = MCS_WRREQ;
 544         dr->wValue = cpu_to_le16(wval);
 545         dr->wIndex = cpu_to_le16(reg);
 546         dr->wLength = cpu_to_le16(0);
 547
 548         usb_fill_control_urb(mcs->led_urb, dev, usb_sndctrlpipe(dev, 0),
 549                 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
 550
 551         usb_submit_urb(mcs->led_urb, GFP_ATOMIC);
 552 }
 553
 554 static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
 555                                 __u16 val)
 556 {
 557         struct usb_device *dev = port->serial->dev;
 558
 559         usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
 560                         val, reg, NULL, 0, MOS_WDR_TIMEOUT);
 561 }
 562
 563 static void mos7840_led_off(unsigned long arg)
 564 {
 565         struct moschip_port *mcs = (struct moschip_port *) arg;
 566
 567         /* Turn off LED */
 568         mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
 569         mod_timer(&mcs->led_timer2,
 570                                 jiffies + msecs_to_jiffies(LED_OFF_MS));
 571 }
 572
 573 static void mos7840_led_flag_off(unsigned long arg)
 574 {
 575         struct moschip_port *mcs = (struct moschip_port *) arg;
 576
 577         clear_bit_unlock(MOS7840_FLAG_LED_BUSY, &mcs->flags);
 578 }
 579
 580 static void mos7840_led_activity(struct usb_serial_port *port)
 581 {
 582         struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
 583
 584         if (test_and_set_bit_lock(MOS7840_FLAG_LED_BUSY, &mos7840_port->flags))
 585                 return;
 586
 587         mos7840_set_led_async(mos7840_port, 0x0301, MODEM_CONTROL_REGISTER);
 588         mod_timer(&mos7840_port->led_timer1,
 589                                 jiffies + msecs_to_jiffies(LED_ON_MS));
 590 }
 591
 592 /*****************************************************************************
 593  * mos7840_interrupt_callback
 594  *      this is the callback function for when we have received data on the
 595  *      interrupt endpoint.
 596  *****************************************************************************/
 597
 598 static void mos7840_interrupt_callback(struct urb *urb)
 599 {
 600         int result;
 601         int length;
 602         struct moschip_port *mos7840_port;
 603         struct usb_serial *serial;
 604         __u16 Data;
 605         unsigned char *data;
 606         __u8 sp[5], st;
 607         int i, rv = 0;
 608         __u16 wval, wreg = 0;
 609         int status = urb->status;
 610
 611         switch (status) {
 612         case 0:
 613                 /* success */
 614                 break;
 615         case -ECONNRESET:
 616         case -ENOENT:
 617         case -ESHUTDOWN:
 618                 /* this urb is terminated, clean up */
 619                 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
 620                         __func__, status);
 621                 return;
 622         default:
 623                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
 624                         __func__, status);
 625                 goto exit;
 626         }
 627
 628         length = urb->actual_length;
 629         data = urb->transfer_buffer;
 630
 631         serial = urb->context;
 632
 633         /* Moschip get 5 bytes
 634          * Byte 1 IIR Port 1 (port.number is 0)
 635          * Byte 2 IIR Port 2 (port.number is 1)
 636          * Byte 3 IIR Port 3 (port.number is 2)
 637          * Byte 4 IIR Port 4 (port.number is 3)
 638          * Byte 5 FIFO status for both */
 639
 640         if (length && length > 5) {
 641                 dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n");
 642                 return;
 643         }
 644
 645         sp[0] = (__u8) data[0];
 646         sp[1] = (__u8) data[1];
 647         sp[2] = (__u8) data[2];
 648         sp[3] = (__u8) data[3];
 649         st = (__u8) data[4];
 650
 651         for (i = 0; i < serial->num_ports; i++) {
 652                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 653                 wval = ((__u16)serial->port[i]->port_number + 1) << 8;
 654                 if (mos7840_port->open) {
 655                         if (sp[i] & 0x01) {
 656                                 dev_dbg(&urb->dev->dev, "SP%d No Interrupt !!!\n", i);
 657                         } else {
 658                                 switch (sp[i] & 0x0f) {
 659                                 case SERIAL_IIR_RLS:
 660                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Receiver status error or \n", i);
 661                                         dev_dbg(&urb->dev->dev, "address bit detected in 9-bit mode\n");
 662                                         mos7840_port->MsrLsr = 1;
 663                                         wreg = LINE_STATUS_REGISTER;
 664                                         break;
 665                                 case SERIAL_IIR_MS:
 666                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Modem status change\n", i);
 667                                         mos7840_port->MsrLsr = 0;
 668                                         wreg = MODEM_STATUS_REGISTER;
 669                                         break;
 670                                 }
 671                                 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 672                         }
 673                 }
 674         }
 675         if (!(rv < 0))
 676                 /* the completion handler for the control urb will resubmit */
 677                 return;
 678 exit:
 679         result = usb_submit_urb(urb, GFP_ATOMIC);
 680         if (result) {
 681                 dev_err(&urb->dev->dev,
 682                         "%s - Error %d submitting interrupt urb\n",
 683                         __func__, result);
 684         }
 685 }
 686
 687 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 688                                        const char *function)
 689 {
 690         if (!port) {
 691                 pr_debug("%s - port == NULL\n", function);
 692                 return -1;
 693         }
 694         if (!port->serial) {
 695                 pr_debug("%s - port->serial == NULL\n", function);
 696                 return -1;
 697         }
 698
 699         return 0;
 700 }
 701
 702 /* Inline functions to check the sanity of a pointer that is passed to us */
 703 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 704                                          const char *function)
 705 {
 706         if (!serial) {
 707                 pr_debug("%s - serial == NULL\n", function);
 708                 return -1;
 709         }
 710         if (!serial->type) {
 711                 pr_debug("%s - serial->type == NULL!\n", function);
 712                 return -1;
 713         }
 714
 715         return 0;
 716 }
 717
 718 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 719                                                  const char *function)
 720 {
 721         /* if no port was specified, or it fails a paranoia check */
 722         if (!port ||
 723             mos7840_port_paranoia_check(port, function) ||
 724             mos7840_serial_paranoia_check(port->serial, function)) {
 725                 /* then say that we don't have a valid usb_serial thing,
 726                  * which will end up genrating -ENODEV return values */
 727                 return NULL;
 728         }
 729
 730         return port->serial;
 731 }
 732
 733 /*****************************************************************************
 734  * mos7840_bulk_in_callback
 735  *      this is the callback function for when we have received data on the
 736  *      bulk in endpoint.
 737  *****************************************************************************/
 738
 739 static void mos7840_bulk_in_callback(struct urb *urb)
 740 {
 741         int retval;
 742         unsigned char *data;
 743         struct usb_serial *serial;
 744         struct usb_serial_port *port;
 745         struct moschip_port *mos7840_port;
 746         int status = urb->status;
 747
 748         mos7840_port = urb->context;
 749         if (!mos7840_port)
 750                 return;
 751
 752         if (status) {
 753                 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
 754                 mos7840_port->read_urb_busy = false;
 755                 return;
 756         }
 757
 758         port = mos7840_port->port;
 759         if (mos7840_port_paranoia_check(port, __func__)) {
 760                 mos7840_port->read_urb_busy = false;
 761                 return;
 762         }
 763
 764         serial = mos7840_get_usb_serial(port, __func__);
 765         if (!serial) {
 766                 mos7840_port->read_urb_busy = false;
 767                 return;
 768         }
 769
 770         data = urb->transfer_buffer;
 771         usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
 772
 773         if (urb->actual_length) {
 774                 struct tty_port *tport = &mos7840_port->port->port;
 775                 tty_insert_flip_string(tport, data, urb->actual_length);
 776                 tty_flip_buffer_push(tport);
 777                 port->icount.rx += urb->actual_length;
 778                 dev_dbg(&port->dev, "icount.rx is %d:\n", port->icount.rx);
 779         }
 780
 781         if (!mos7840_port->read_urb) {
 782                 dev_dbg(&port->dev, "%s", "URB KILLED !!!\n");
 783                 mos7840_port->read_urb_busy = false;
 784                 return;
 785         }
 786
 787         if (mos7840_port->has_led)
 788                 mos7840_led_activity(port);
 789
 790         mos7840_port->read_urb_busy = true;
 791         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 792
 793         if (retval) {
 794                 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
 795                 mos7840_port->read_urb_busy = false;
 796         }
 797 }
 798
 799 /*****************************************************************************
 800  * mos7840_bulk_out_data_callback
 801  *      this is the callback function for when we have finished sending
 802  *      serial data on the bulk out endpoint.
 803  *****************************************************************************/
 804
 805 static void mos7840_bulk_out_data_callback(struct urb *urb)
 806 {
 807         struct moschip_port *mos7840_port;
 808         struct usb_serial_port *port;
 809         int status = urb->status;
 810         int i;
 811
 812         mos7840_port = urb->context;
 813         port = mos7840_port->port;
 814         spin_lock(&mos7840_port->pool_lock);
 815         for (i = 0; i < NUM_URBS; i++) {
 816                 if (urb == mos7840_port->write_urb_pool[i]) {
 817                         mos7840_port->busy[i] = 0;
 818                         break;
 819                 }
 820         }
 821         spin_unlock(&mos7840_port->pool_lock);
 822
 823         if (status) {
 824                 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
 825                 return;
 826         }
 827
 828         if (mos7840_port_paranoia_check(port, __func__))
 829                 return;
 830
 831         if (mos7840_port->open)
 832                 tty_port_tty_wakeup(&port->port);
 833
 834 }
 835
 836 /************************************************************************/
 837 /*       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       */
 838 /************************************************************************/
 839
 840 /*****************************************************************************
 841  * mos7840_open
 842  *      this function is called by the tty driver when a port is opened
 843  *      If successful, we return 0
 844  *      Otherwise we return a negative error number.
 845  *****************************************************************************/
 846
 847 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
 848 {
 849         int response;
 850         int j;
 851         struct usb_serial *serial;
 852         struct urb *urb;
 853         __u16 Data;
 854         int status;
 855         struct moschip_port *mos7840_port;
 856         struct moschip_port *port0;
 857
 858         if (mos7840_port_paranoia_check(port, __func__))
 859                 return -ENODEV;
 860
 861         serial = port->serial;
 862
 863         if (mos7840_serial_paranoia_check(serial, __func__))
 864                 return -ENODEV;
 865
 866         mos7840_port = mos7840_get_port_private(port);
 867         port0 = mos7840_get_port_private(serial->port[0]);
 868
 869         if (mos7840_port == NULL || port0 == NULL)
 870                 return -ENODEV;
 871
 872         usb_clear_halt(serial->dev, port->write_urb->pipe);
 873         usb_clear_halt(serial->dev, port->read_urb->pipe);
 874         port0->open_ports++;
 875
 876         /* Initialising the write urb pool */
 877         for (j = 0; j < NUM_URBS; ++j) {
 878                 urb = usb_alloc_urb(0, GFP_KERNEL);
 879                 mos7840_port->write_urb_pool[j] = urb;
 880
 881                 if (urb == NULL) {
 882                         dev_err(&port->dev, "No more urbs???\n");
 883                         continue;
 884                 }
 885
 886                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 887                                                                 GFP_KERNEL);
 888                 if (!urb->transfer_buffer) {
 889                         usb_free_urb(urb);
 890                         mos7840_port->write_urb_pool[j] = NULL;
 891                         dev_err(&port->dev,
 892                                 "%s-out of memory for urb buffers.\n",
 893                                 __func__);
 894                         continue;
 895                 }
 896         }
 897
 898 /*****************************************************************************
 899  * Initialize MCS7840 -- Write Init values to corresponding Registers
 900  *
 901  * Register Index
 902  * 1 : IER
 903  * 2 : FCR
 904  * 3 : LCR
 905  * 4 : MCR
 906  *
 907  * 0x08 : SP1/2 Control Reg
 908  *****************************************************************************/
 909
 910         /* NEED to check the following Block */
 911
 912         Data = 0x0;
 913         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 914         if (status < 0) {
 915                 dev_dbg(&port->dev, "Reading Spreg failed\n");
 916                 goto err;
 917         }
 918         Data |= 0x80;
 919         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 920         if (status < 0) {
 921                 dev_dbg(&port->dev, "writing Spreg failed\n");
 922                 goto err;
 923         }
 924
 925         Data &= ~0x80;
 926         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 927         if (status < 0) {
 928                 dev_dbg(&port->dev, "writing Spreg failed\n");
 929                 goto err;
 930         }
 931         /* End of block to be checked */
 932
 933         Data = 0x0;
 934         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 935                                                                         &Data);
 936         if (status < 0) {
 937                 dev_dbg(&port->dev, "Reading Controlreg failed\n");
 938                 goto err;
 939         }
 940         Data |= 0x08;           /* Driver done bit */
 941         Data |= 0x20;           /* rx_disable */
 942         status = mos7840_set_reg_sync(port,
 943                                 mos7840_port->ControlRegOffset, Data);
 944         if (status < 0) {
 945                 dev_dbg(&port->dev, "writing Controlreg failed\n");
 946                 goto err;
 947         }
 948         /* do register settings here */
 949         /* Set all regs to the device default values. */
 950         /***********************************
 951          * First Disable all interrupts.
 952          ***********************************/
 953         Data = 0x00;
 954         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 955         if (status < 0) {
 956                 dev_dbg(&port->dev, "disabling interrupts failed\n");
 957                 goto err;
 958         }
 959         /* Set FIFO_CONTROL_REGISTER to the default value */
 960         Data = 0x00;
 961         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 962         if (status < 0) {
 963                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
 964                 goto err;
 965         }
 966
 967         Data = 0xcf;
 968         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 969         if (status < 0) {
 970                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
 971                 goto err;
 972         }
 973
 974         Data = 0x03;
 975         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 976         mos7840_port->shadowLCR = Data;
 977
 978         Data = 0x0b;
 979         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
 980         mos7840_port->shadowMCR = Data;
 981
 982         Data = 0x00;
 983         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 984         mos7840_port->shadowLCR = Data;
 985
 986         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
 987         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 988
 989         Data = 0x0c;
 990         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
 991
 992         Data = 0x0;
 993         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
 994
 995         Data = 0x00;
 996         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 997
 998         Data = Data & ~SERIAL_LCR_DLAB;
 999         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1000         mos7840_port->shadowLCR = Data;
1001
1002         /* clearing Bulkin and Bulkout Fifo */
1003         Data = 0x0;
1004         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1005
1006         Data = Data | 0x0c;
1007         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1008
1009         Data = Data & ~0x0c;
1010         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1011         /* Finally enable all interrupts */
1012         Data = 0x0c;
1013         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1014
1015         /* clearing rx_disable */
1016         Data = 0x0;
1017         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1018                                                                         &Data);
1019         Data = Data & ~0x20;
1020         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1021                                                                         Data);
1022
1023         /* rx_negate */
1024         Data = 0x0;
1025         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1026                                                                         &Data);
1027         Data = Data | 0x10;
1028         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1029                                                                         Data);
1030
1031         /* Check to see if we've set up our endpoint info yet    *
1032          * (can't set it up in mos7840_startup as the structures *
1033          * were not set up at that time.)                        */
1034         if (port0->open_ports == 1) {
1035                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1036                         /* set up interrupt urb */
1037                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1038                                 serial->dev,
1039                                 usb_rcvintpipe(serial->dev,
1040                                 serial->port[0]->interrupt_in_endpointAddress),
1041                                 serial->port[0]->interrupt_in_buffer,
1042                                 serial->port[0]->interrupt_in_urb->
1043                                 transfer_buffer_length,
1044                                 mos7840_interrupt_callback,
1045                                 serial,
1046                                 serial->port[0]->interrupt_in_urb->interval);
1047
1048                         /* start interrupt read for mos7840               *
1049                          * will continue as long as mos7840 is connected  */
1050
1051                         response =
1052                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1053                                            GFP_KERNEL);
1054                         if (response) {
1055                                 dev_err(&port->dev, "%s - Error %d submitting "
1056                                         "interrupt urb\n", __func__, response);
1057                         }
1058
1059                 }
1060
1061         }
1062
1063         /* see if we've set up our endpoint info yet   *
1064          * (can't set it up in mos7840_startup as the  *
1065          * structures were not set up at that time.)   */
1066
1067         dev_dbg(&port->dev, "port number is %d\n", port->port_number);
1068         dev_dbg(&port->dev, "minor number is %d\n", port->minor);
1069         dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
1070         dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
1071         dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
1072         dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
1073         mos7840_port->read_urb = port->read_urb;
1074
1075         /* set up our bulk in urb */
1076         if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1077                 usb_fill_bulk_urb(mos7840_port->read_urb,
1078                         serial->dev,
1079                         usb_rcvbulkpipe(serial->dev,
1080                                 (port->bulk_in_endpointAddress) + 2),
1081                         port->bulk_in_buffer,
1082                         mos7840_port->read_urb->transfer_buffer_length,
1083                         mos7840_bulk_in_callback, mos7840_port);
1084         } else {
1085                 usb_fill_bulk_urb(mos7840_port->read_urb,
1086                         serial->dev,
1087                         usb_rcvbulkpipe(serial->dev,
1088                                 port->bulk_in_endpointAddress),
1089                         port->bulk_in_buffer,
1090                         mos7840_port->read_urb->transfer_buffer_length,
1091                         mos7840_bulk_in_callback, mos7840_port);
1092         }
1093
1094         dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
1095         mos7840_port->read_urb_busy = true;
1096         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1097         if (response) {
1098                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1099                         __func__, response);
1100                 mos7840_port->read_urb_busy = false;
1101         }
1102
1103         /* initialize our wait queues */
1104         init_waitqueue_head(&mos7840_port->wait_chase);
1105
1106         /* initialize our port settings */
1107         /* Must set to enable ints! */
1108         mos7840_port->shadowMCR = MCR_MASTER_IE;
1109         /* send a open port command */
1110         mos7840_port->open = 1;
1111         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1112
1113         return 0;
1114 err:
1115         for (j = 0; j < NUM_URBS; ++j) {
1116                 urb = mos7840_port->write_urb_pool[j];
1117                 if (!urb)
1118                         continue;
1119                 kfree(urb->transfer_buffer);
1120                 usb_free_urb(urb);
1121         }
1122         return status;
1123 }
1124
1125 /*****************************************************************************
1126  * mos7840_chars_in_buffer
1127  *      this function is called by the tty driver when it wants to know how many
1128  *      bytes of data we currently have outstanding in the port (data that has
1129  *      been written, but hasn't made it out the port yet)
1130  *      If successful, we return the number of bytes left to be written in the
1131  *      system,
1132  *      Otherwise we return zero.
1133  *****************************************************************************/
1134
1135 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1136 {
1137         struct usb_serial_port *port = tty->driver_data;
1138         int i;
1139         int chars = 0;
1140         unsigned long flags;
1141         struct moschip_port *mos7840_port;
1142
1143         if (mos7840_port_paranoia_check(port, __func__))
1144                 return 0;
1145
1146         mos7840_port = mos7840_get_port_private(port);
1147         if (mos7840_port == NULL)
1148                 return 0;
1149
1150         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1151         for (i = 0; i < NUM_URBS; ++i) {
1152                 if (mos7840_port->busy[i]) {
1153                         struct urb *urb = mos7840_port->write_urb_pool[i];
1154                         chars += urb->transfer_buffer_length;
1155                 }
1156         }
1157         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1158         dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1159         return chars;
1160
1161 }
1162
1163 /*****************************************************************************
1164  * mos7840_close
1165  *      this function is called by the tty driver when a port is closed
1166  *****************************************************************************/
1167
1168 static void mos7840_close(struct usb_serial_port *port)
1169 {
1170         struct usb_serial *serial;
1171         struct moschip_port *mos7840_port;
1172         struct moschip_port *port0;
1173         int j;
1174         __u16 Data;
1175
1176         if (mos7840_port_paranoia_check(port, __func__))
1177                 return;
1178
1179         serial = mos7840_get_usb_serial(port, __func__);
1180         if (!serial)
1181                 return;
1182
1183         mos7840_port = mos7840_get_port_private(port);
1184         port0 = mos7840_get_port_private(serial->port[0]);
1185
1186         if (mos7840_port == NULL || port0 == NULL)
1187                 return;
1188
1189         for (j = 0; j < NUM_URBS; ++j)
1190                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1191
1192         /* Freeing Write URBs */
1193         for (j = 0; j < NUM_URBS; ++j) {
1194                 if (mos7840_port->write_urb_pool[j]) {
1195                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1196                                 kfree(mos7840_port->write_urb_pool[j]->
1197                                       transfer_buffer);
1198
1199                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1200                 }
1201         }
1202
1203         usb_kill_urb(mos7840_port->write_urb);
1204         usb_kill_urb(mos7840_port->read_urb);
1205         mos7840_port->read_urb_busy = false;
1206
1207         port0->open_ports--;
1208         dev_dbg(&port->dev, "%s in close%d\n", __func__, port0->open_ports);
1209         if (port0->open_ports == 0) {
1210                 if (serial->port[0]->interrupt_in_urb) {
1211                         dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n");
1212                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1213                 }
1214         }
1215
1216         if (mos7840_port->write_urb) {
1217                 /* if this urb had a transfer buffer already (old tx) free it */
1218                 kfree(mos7840_port->write_urb->transfer_buffer);
1219                 usb_free_urb(mos7840_port->write_urb);
1220         }
1221
1222         Data = 0x0;
1223         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1224
1225         Data = 0x00;
1226         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1227
1228         mos7840_port->open = 0;
1229 }
1230
1231 /************************************************************************
1232  *
1233  * mos7840_block_until_chase_response
1234  *
1235  *      This function will block the close until one of the following:
1236  *              1. Response to our Chase comes from mos7840
1237  *              2. A timeout of 10 seconds without activity has expired
1238  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1239  *
1240  ************************************************************************/
1241
1242 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1243                                         struct moschip_port *mos7840_port)
1244 {
1245         int timeout = msecs_to_jiffies(1000);
1246         int wait = 10;
1247         int count;
1248
1249         while (1) {
1250                 count = mos7840_chars_in_buffer(tty);
1251
1252                 /* Check for Buffer status */
1253                 if (count <= 0)
1254                         return;
1255
1256                 /* Block the thread for a while */
1257                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1258                                                timeout);
1259                 /* No activity.. count down section */
1260                 wait--;
1261                 if (wait == 0) {
1262                         dev_dbg(&mos7840_port->port->dev, "%s - TIMEOUT\n", __func__);
1263                         return;
1264                 } else {
1265                         /* Reset timeout value back to seconds */
1266                         wait = 10;
1267                 }
1268         }
1269
1270 }
1271
1272 /*****************************************************************************
1273  * mos7840_break
1274  *      this function sends a break to the port
1275  *****************************************************************************/
1276 static void mos7840_break(struct tty_struct *tty, int break_state)
1277 {
1278         struct usb_serial_port *port = tty->driver_data;
1279         unsigned char data;
1280         struct usb_serial *serial;
1281         struct moschip_port *mos7840_port;
1282
1283         if (mos7840_port_paranoia_check(port, __func__))
1284                 return;
1285
1286         serial = mos7840_get_usb_serial(port, __func__);
1287         if (!serial)
1288                 return;
1289
1290         mos7840_port = mos7840_get_port_private(port);
1291
1292         if (mos7840_port == NULL)
1293                 return;
1294
1295         /* flush and block until tx is empty */
1296         mos7840_block_until_chase_response(tty, mos7840_port);
1297
1298         if (break_state == -1)
1299                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1300         else
1301                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1302
1303         /* FIXME: no locking on shadowLCR anywhere in driver */
1304         mos7840_port->shadowLCR = data;
1305         dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1306         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1307                              mos7840_port->shadowLCR);
1308 }
1309
1310 /*****************************************************************************
1311  * mos7840_write_room
1312  *      this function is called by the tty driver when it wants to know how many
1313  *      bytes of data we can accept for a specific port.
1314  *      If successful, we return the amount of room that we have for this port
1315  *      Otherwise we return a negative error number.
1316  *****************************************************************************/
1317
1318 static int mos7840_write_room(struct tty_struct *tty)
1319 {
1320         struct usb_serial_port *port = tty->driver_data;
1321         int i;
1322         int room = 0;
1323         unsigned long flags;
1324         struct moschip_port *mos7840_port;
1325
1326         if (mos7840_port_paranoia_check(port, __func__))
1327                 return -1;
1328
1329         mos7840_port = mos7840_get_port_private(port);
1330         if (mos7840_port == NULL)
1331                 return -1;
1332
1333         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1334         for (i = 0; i < NUM_URBS; ++i) {
1335                 if (!mos7840_port->busy[i])
1336                         room += URB_TRANSFER_BUFFER_SIZE;
1337         }
1338         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1339
1340         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1341         dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room);
1342         return room;
1343
1344 }
1345
1346 /*****************************************************************************
1347  * mos7840_write
1348  *      this function is called by the tty driver when data should be written to
1349  *      the port.
1350  *      If successful, we return the number of bytes written, otherwise we
1351  *      return a negative error number.
1352  *****************************************************************************/
1353
1354 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1355                          const unsigned char *data, int count)
1356 {
1357         int status;
1358         int i;
1359         int bytes_sent = 0;
1360         int transfer_size;
1361         unsigned long flags;
1362
1363         struct moschip_port *mos7840_port;
1364         struct usb_serial *serial;
1365         struct urb *urb;
1366         /* __u16 Data; */
1367         const unsigned char *current_position = data;
1368         unsigned char *data1;
1369
1370 #ifdef NOTMOS7840
1371         Data = 0x00;
1372         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1373         mos7840_port->shadowLCR = Data;
1374         dev_dbg(&port->dev, "%s: LINE_CONTROL_REGISTER is %x\n", __func__, Data);
1375         dev_dbg(&port->dev, "%s: mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1376
1377         /* Data = 0x03; */
1378         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1379         /* mos7840_port->shadowLCR=Data;//Need to add later */
1380
1381         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1382         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1383
1384         /* Data = 0x0c; */
1385         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1386         Data = 0x00;
1387         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1388         dev_dbg(&port->dev, "%s: DLL value is %x\n", __func__, Data);
1389
1390         Data = 0x0;
1391         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1392         dev_dbg(&port->dev, "%s: DLM value is %x\n", __func__, Data);
1393
1394         Data = Data & ~SERIAL_LCR_DLAB;
1395         dev_dbg(&port->dev, "%s: mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1396         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1397 #endif
1398
1399         if (mos7840_port_paranoia_check(port, __func__))
1400                 return -1;
1401
1402         serial = port->serial;
1403         if (mos7840_serial_paranoia_check(serial, __func__))
1404                 return -1;
1405
1406         mos7840_port = mos7840_get_port_private(port);
1407         if (mos7840_port == NULL)
1408                 return -1;
1409
1410         /* try to find a free urb in the list */
1411         urb = NULL;
1412
1413         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1414         for (i = 0; i < NUM_URBS; ++i) {
1415                 if (!mos7840_port->busy[i]) {
1416                         mos7840_port->busy[i] = 1;
1417                         urb = mos7840_port->write_urb_pool[i];
1418                         dev_dbg(&port->dev, "URB:%d\n", i);
1419                         break;
1420                 }
1421         }
1422         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1423
1424         if (urb == NULL) {
1425                 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1426                 goto exit;
1427         }
1428
1429         if (urb->transfer_buffer == NULL) {
1430                 urb->transfer_buffer =
1431                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1432
1433                 if (urb->transfer_buffer == NULL) {
1434                         dev_err_console(port, "%s no more kernel memory...\n",
1435                                 __func__);
1436                         goto exit;
1437                 }
1438         }
1439         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1440
1441         memcpy(urb->transfer_buffer, current_position, transfer_size);
1442
1443         /* fill urb with data and submit  */
1444         if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1445                 usb_fill_bulk_urb(urb,
1446                         serial->dev,
1447                         usb_sndbulkpipe(serial->dev,
1448                                 (port->bulk_out_endpointAddress) + 2),
1449                         urb->transfer_buffer,
1450                         transfer_size,
1451                         mos7840_bulk_out_data_callback, mos7840_port);
1452         } else {
1453                 usb_fill_bulk_urb(urb,
1454                         serial->dev,
1455                         usb_sndbulkpipe(serial->dev,
1456                                 port->bulk_out_endpointAddress),
1457                         urb->transfer_buffer,
1458                         transfer_size,
1459                         mos7840_bulk_out_data_callback, mos7840_port);
1460         }
1461
1462         data1 = urb->transfer_buffer;
1463         dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
1464
1465         if (mos7840_port->has_led)
1466                 mos7840_led_activity(port);
1467
1468         /* send it down the pipe */
1469         status = usb_submit_urb(urb, GFP_ATOMIC);
1470
1471         if (status) {
1472                 mos7840_port->busy[i] = 0;
1473                 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1474                         "with status = %d\n", __func__, status);
1475                 bytes_sent = status;
1476                 goto exit;
1477         }
1478         bytes_sent = transfer_size;
1479         port->icount.tx += transfer_size;
1480         dev_dbg(&port->dev, "icount.tx is %d:\n", port->icount.tx);
1481 exit:
1482         return bytes_sent;
1483
1484 }
1485
1486 /*****************************************************************************
1487  * mos7840_throttle
1488  *      this function is called by the tty driver when it wants to stop the data
1489  *      being read from the port.
1490  *****************************************************************************/
1491
1492 static void mos7840_throttle(struct tty_struct *tty)
1493 {
1494         struct usb_serial_port *port = tty->driver_data;
1495         struct moschip_port *mos7840_port;
1496         int status;
1497
1498         if (mos7840_port_paranoia_check(port, __func__))
1499                 return;
1500
1501         mos7840_port = mos7840_get_port_private(port);
1502
1503         if (mos7840_port == NULL)
1504                 return;
1505
1506         if (!mos7840_port->open) {
1507                 dev_dbg(&port->dev, "%s", "port not opened\n");
1508                 return;
1509         }
1510
1511         /* if we are implementing XON/XOFF, send the stop character */
1512         if (I_IXOFF(tty)) {
1513                 unsigned char stop_char = STOP_CHAR(tty);
1514                 status = mos7840_write(tty, port, &stop_char, 1);
1515                 if (status <= 0)
1516                         return;
1517         }
1518         /* if we are implementing RTS/CTS, toggle that line */
1519         if (tty->termios.c_cflag & CRTSCTS) {
1520                 mos7840_port->shadowMCR &= ~MCR_RTS;
1521                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1522                                          mos7840_port->shadowMCR);
1523                 if (status < 0)
1524                         return;
1525         }
1526 }
1527
1528 /*****************************************************************************
1529  * mos7840_unthrottle
1530  *      this function is called by the tty driver when it wants to resume
1531  *      the data being read from the port (called after mos7840_throttle is
1532  *      called)
1533  *****************************************************************************/
1534 static void mos7840_unthrottle(struct tty_struct *tty)
1535 {
1536         struct usb_serial_port *port = tty->driver_data;
1537         int status;
1538         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1539
1540         if (mos7840_port_paranoia_check(port, __func__))
1541                 return;
1542
1543         if (mos7840_port == NULL)
1544                 return;
1545
1546         if (!mos7840_port->open) {
1547                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1548                 return;
1549         }
1550
1551         /* if we are implementing XON/XOFF, send the start character */
1552         if (I_IXOFF(tty)) {
1553                 unsigned char start_char = START_CHAR(tty);
1554                 status = mos7840_write(tty, port, &start_char, 1);
1555                 if (status <= 0)
1556                         return;
1557         }
1558
1559         /* if we are implementing RTS/CTS, toggle that line */
1560         if (tty->termios.c_cflag & CRTSCTS) {
1561                 mos7840_port->shadowMCR |= MCR_RTS;
1562                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1563                                          mos7840_port->shadowMCR);
1564                 if (status < 0)
1565                         return;
1566         }
1567 }
1568
1569 static int mos7840_tiocmget(struct tty_struct *tty)
1570 {
1571         struct usb_serial_port *port = tty->driver_data;
1572         struct moschip_port *mos7840_port;
1573         unsigned int result;
1574         __u16 msr;
1575         __u16 mcr;
1576         int status;
1577         mos7840_port = mos7840_get_port_private(port);
1578
1579         if (mos7840_port == NULL)
1580                 return -ENODEV;
1581
1582         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1583         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1584         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1585             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1586             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1587             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1588             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1589             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1590             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1591
1592         dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1593
1594         return result;
1595 }
1596
1597 static int mos7840_tiocmset(struct tty_struct *tty,
1598                             unsigned int set, unsigned int clear)
1599 {
1600         struct usb_serial_port *port = tty->driver_data;
1601         struct moschip_port *mos7840_port;
1602         unsigned int mcr;
1603         int status;
1604
1605         mos7840_port = mos7840_get_port_private(port);
1606
1607         if (mos7840_port == NULL)
1608                 return -ENODEV;
1609
1610         /* FIXME: What locks the port registers ? */
1611         mcr = mos7840_port->shadowMCR;
1612         if (clear & TIOCM_RTS)
1613                 mcr &= ~MCR_RTS;
1614         if (clear & TIOCM_DTR)
1615                 mcr &= ~MCR_DTR;
1616         if (clear & TIOCM_LOOP)
1617                 mcr &= ~MCR_LOOPBACK;
1618
1619         if (set & TIOCM_RTS)
1620                 mcr |= MCR_RTS;
1621         if (set & TIOCM_DTR)
1622                 mcr |= MCR_DTR;
1623         if (set & TIOCM_LOOP)
1624                 mcr |= MCR_LOOPBACK;
1625
1626         mos7840_port->shadowMCR = mcr;
1627
1628         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1629         if (status < 0) {
1630                 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1631                 return status;
1632         }
1633
1634         return 0;
1635 }
1636
1637 /*****************************************************************************
1638  * mos7840_calc_baud_rate_divisor
1639  *      this function calculates the proper baud rate divisor for the specified
1640  *      baud rate.
1641  *****************************************************************************/
1642 static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1643                                           int baudRate, int *divisor,
1644                                           __u16 *clk_sel_val)
1645 {
1646         dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1647
1648         if (baudRate <= 115200) {
1649                 *divisor = 115200 / baudRate;
1650                 *clk_sel_val = 0x0;
1651         }
1652         if ((baudRate > 115200) && (baudRate <= 230400)) {
1653                 *divisor = 230400 / baudRate;
1654                 *clk_sel_val = 0x10;
1655         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1656                 *divisor = 403200 / baudRate;
1657                 *clk_sel_val = 0x20;
1658         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1659                 *divisor = 460800 / baudRate;
1660                 *clk_sel_val = 0x30;
1661         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1662                 *divisor = 806400 / baudRate;
1663                 *clk_sel_val = 0x40;
1664         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1665                 *divisor = 921600 / baudRate;
1666                 *clk_sel_val = 0x50;
1667         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1668                 *divisor = 1572864 / baudRate;
1669                 *clk_sel_val = 0x60;
1670         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1671                 *divisor = 3145728 / baudRate;
1672                 *clk_sel_val = 0x70;
1673         }
1674         return 0;
1675
1676 #ifdef NOTMCS7840
1677
1678         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1679                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1680                         *divisor = mos7840_divisor_table[i].Divisor;
1681                         return 0;
1682                 }
1683         }
1684
1685         /* After trying for all the standard baud rates    *
1686          * Try calculating the divisor for this baud rate  */
1687
1688         if (baudrate > 75 && baudrate < 230400) {
1689                 /* get the divisor */
1690                 custom = (__u16) (230400L / baudrate);
1691
1692                 /* Check for round off */
1693                 round1 = (__u16) (2304000L / baudrate);
1694                 round = (__u16) (round1 - (custom * 10));
1695                 if (round > 4)
1696                         custom++;
1697                 *divisor = custom;
1698
1699                 dev_dbg(&port->dev, " Baud %d = %d\n", baudrate, custom);
1700                 return 0;
1701         }
1702
1703         dev_dbg(&port->dev, "%s", " Baud calculation Failed...\n");
1704         return -1;
1705 #endif
1706 }
1707
1708 /*****************************************************************************
1709  * mos7840_send_cmd_write_baud_rate
1710  *      this function sends the proper command to change the baud rate of the
1711  *      specified port.
1712  *****************************************************************************/
1713
1714 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1715                                             int baudRate)
1716 {
1717         int divisor = 0;
1718         int status;
1719         __u16 Data;
1720         unsigned char number;
1721         __u16 clk_sel_val;
1722         struct usb_serial_port *port;
1723
1724         if (mos7840_port == NULL)
1725                 return -1;
1726
1727         port = mos7840_port->port;
1728         if (mos7840_port_paranoia_check(port, __func__))
1729                 return -1;
1730
1731         if (mos7840_serial_paranoia_check(port->serial, __func__))
1732                 return -1;
1733
1734         number = mos7840_port->port->port_number;
1735
1736         dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudRate);
1737         /* reset clk_uart_sel in spregOffset */
1738         if (baudRate > 115200) {
1739 #ifdef HW_flow_control
1740                 /* NOTE: need to see the pther register to modify */
1741                 /* setting h/w flow control bit to 1 */
1742                 Data = 0x2b;
1743                 mos7840_port->shadowMCR = Data;
1744                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1745                                                                         Data);
1746                 if (status < 0) {
1747                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1748                         return -1;
1749                 }
1750 #endif
1751
1752         } else {
1753 #ifdef HW_flow_control
1754                 /* setting h/w flow control bit to 0 */
1755                 Data = 0xb;
1756                 mos7840_port->shadowMCR = Data;
1757                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1758                                                                         Data);
1759                 if (status < 0) {
1760                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1761                         return -1;
1762                 }
1763 #endif
1764
1765         }
1766
1767         if (1) {                /* baudRate <= 115200) */
1768                 clk_sel_val = 0x0;
1769                 Data = 0x0;
1770                 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1771                                                    &clk_sel_val);
1772                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1773                                                                  &Data);
1774                 if (status < 0) {
1775                         dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1776                         return -1;
1777                 }
1778                 Data = (Data & 0x8f) | clk_sel_val;
1779                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1780                                                                 Data);
1781                 if (status < 0) {
1782                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1783                         return -1;
1784                 }
1785                 /* Calculate the Divisor */
1786
1787                 if (status) {
1788                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1789                         return status;
1790                 }
1791                 /* Enable access to divisor latch */
1792                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1793                 mos7840_port->shadowLCR = Data;
1794                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1795
1796                 /* Write the divisor */
1797                 Data = (unsigned char)(divisor & 0xff);
1798                 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1799                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1800
1801                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1802                 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1803                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1804
1805                 /* Disable access to divisor latch */
1806                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1807                 mos7840_port->shadowLCR = Data;
1808                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1809
1810         }
1811         return status;
1812 }
1813
1814 /*****************************************************************************
1815  * mos7840_change_port_settings
1816  *      This routine is called to set the UART on the device to match
1817  *      the specified new settings.
1818  *****************************************************************************/
1819
1820 static void mos7840_change_port_settings(struct tty_struct *tty,
1821         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1822 {
1823         int baud;
1824         unsigned cflag;
1825         unsigned iflag;
1826         __u8 lData;
1827         __u8 lParity;
1828         __u8 lStop;
1829         int status;
1830         __u16 Data;
1831         struct usb_serial_port *port;
1832         struct usb_serial *serial;
1833
1834         if (mos7840_port == NULL)
1835                 return;
1836
1837         port = mos7840_port->port;
1838
1839         if (mos7840_port_paranoia_check(port, __func__))
1840                 return;
1841
1842         if (mos7840_serial_paranoia_check(port->serial, __func__))
1843                 return;
1844
1845         serial = port->serial;
1846
1847         if (!mos7840_port->open) {
1848                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1849                 return;
1850         }
1851
1852         lData = LCR_BITS_8;
1853         lStop = LCR_STOP_1;
1854         lParity = LCR_PAR_NONE;
1855
1856         cflag = tty->termios.c_cflag;
1857         iflag = tty->termios.c_iflag;
1858
1859         /* Change the number of bits */
1860         if (cflag & CSIZE) {
1861                 switch (cflag & CSIZE) {
1862                 case CS5:
1863                         lData = LCR_BITS_5;
1864                         break;
1865
1866                 case CS6:
1867                         lData = LCR_BITS_6;
1868                         break;
1869
1870                 case CS7:
1871                         lData = LCR_BITS_7;
1872                         break;
1873                 default:
1874                 case CS8:
1875                         lData = LCR_BITS_8;
1876                         break;
1877                 }
1878         }
1879         /* Change the Parity bit */
1880         if (cflag & PARENB) {
1881                 if (cflag & PARODD) {
1882                         lParity = LCR_PAR_ODD;
1883                         dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1884                 } else {
1885                         lParity = LCR_PAR_EVEN;
1886                         dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1887                 }
1888
1889         } else {
1890                 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1891         }
1892
1893         if (cflag & CMSPAR)
1894                 lParity = lParity | 0x20;
1895
1896         /* Change the Stop bit */
1897         if (cflag & CSTOPB) {
1898                 lStop = LCR_STOP_2;
1899                 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1900         } else {
1901                 lStop = LCR_STOP_1;
1902                 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1903         }
1904
1905         /* Update the LCR with the correct value */
1906         mos7840_port->shadowLCR &=
1907             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1908         mos7840_port->shadowLCR |= (lData | lParity | lStop);
1909
1910         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1911                 mos7840_port->shadowLCR);
1912         /* Disable Interrupts */
1913         Data = 0x00;
1914         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1915
1916         Data = 0x00;
1917         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1918
1919         Data = 0xcf;
1920         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1921
1922         /* Send the updated LCR value to the mos7840 */
1923         Data = mos7840_port->shadowLCR;
1924
1925         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1926
1927         Data = 0x00b;
1928         mos7840_port->shadowMCR = Data;
1929         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1930         Data = 0x00b;
1931         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1932
1933         /* set up the MCR register and send it to the mos7840 */
1934
1935         mos7840_port->shadowMCR = MCR_MASTER_IE;
1936         if (cflag & CBAUD)
1937                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1938
1939         if (cflag & CRTSCTS)
1940                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1941         else
1942                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1943
1944         Data = mos7840_port->shadowMCR;
1945         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1946
1947         /* Determine divisor based on baud rate */
1948         baud = tty_get_baud_rate(tty);
1949
1950         if (!baud) {
1951                 /* pick a default, any default... */
1952                 dev_dbg(&port->dev, "%s", "Picked default baud...\n");
1953                 baud = 9600;
1954         }
1955
1956         dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1957         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
1958
1959         /* Enable Interrupts */
1960         Data = 0x0c;
1961         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1962
1963         if (mos7840_port->read_urb_busy == false) {
1964                 mos7840_port->read_urb_busy = true;
1965                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
1966                 if (status) {
1967                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1968                             status);
1969                         mos7840_port->read_urb_busy = false;
1970                 }
1971         }
1972         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
1973                 mos7840_port->shadowLCR);
1974 }
1975
1976 /*****************************************************************************
1977  * mos7840_set_termios
1978  *      this function is called by the tty driver when it wants to change
1979  *      the termios structure
1980  *****************************************************************************/
1981
1982 static void mos7840_set_termios(struct tty_struct *tty,
1983                                 struct usb_serial_port *port,
1984                                 struct ktermios *old_termios)
1985 {
1986         int status;
1987         unsigned int cflag;
1988         struct usb_serial *serial;
1989         struct moschip_port *mos7840_port;
1990
1991         if (mos7840_port_paranoia_check(port, __func__))
1992                 return;
1993
1994         serial = port->serial;
1995
1996         if (mos7840_serial_paranoia_check(serial, __func__))
1997                 return;
1998
1999         mos7840_port = mos7840_get_port_private(port);
2000
2001         if (mos7840_port == NULL)
2002                 return;
2003
2004         if (!mos7840_port->open) {
2005                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
2006                 return;
2007         }
2008
2009         dev_dbg(&port->dev, "%s", "setting termios - \n");
2010
2011         cflag = tty->termios.c_cflag;
2012
2013         dev_dbg(&port->dev, "%s - clfag %08x iflag %08x\n", __func__,
2014                 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
2015         dev_dbg(&port->dev, "%s - old clfag %08x old iflag %08x\n", __func__,
2016                 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2017
2018         /* change the port settings to the new ones specified */
2019
2020         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2021
2022         if (!mos7840_port->read_urb) {
2023                 dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n");
2024                 return;
2025         }
2026
2027         if (mos7840_port->read_urb_busy == false) {
2028                 mos7840_port->read_urb_busy = true;
2029                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2030                 if (status) {
2031                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
2032                             status);
2033                         mos7840_port->read_urb_busy = false;
2034                 }
2035         }
2036 }
2037
2038 /*****************************************************************************
2039  * mos7840_get_lsr_info - get line status register info
2040  *
2041  * Purpose: Let user call ioctl() to get info when the UART physically
2042  *          is emptied.  On bus types like RS485, the transmitter must
2043  *          release the bus after transmitting. This must be done when
2044  *          the transmit shift register is empty, not be done when the
2045  *          transmit holding register is empty.  This functionality
2046  *          allows an RS485 driver to be written in user space.
2047  *****************************************************************************/
2048
2049 static int mos7840_get_lsr_info(struct tty_struct *tty,
2050                                 unsigned int __user *value)
2051 {
2052         int count;
2053         unsigned int result = 0;
2054
2055         count = mos7840_chars_in_buffer(tty);
2056         if (count == 0)
2057                 result = TIOCSER_TEMT;
2058
2059         if (copy_to_user(value, &result, sizeof(int)))
2060                 return -EFAULT;
2061         return 0;
2062 }
2063
2064 /*****************************************************************************
2065  * mos7840_get_serial_info
2066  *      function to get information about serial port
2067  *****************************************************************************/
2068
2069 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2070                                    struct serial_struct __user *retinfo)
2071 {
2072         struct serial_struct tmp;
2073
2074         if (mos7840_port == NULL)
2075                 return -1;
2076
2077         if (!retinfo)
2078                 return -EFAULT;
2079
2080         memset(&tmp, 0, sizeof(tmp));
2081
2082         tmp.type = PORT_16550A;
2083         tmp.line = mos7840_port->port->minor;
2084         tmp.port = mos7840_port->port->port_number;
2085         tmp.irq = 0;
2086         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2087         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2088         tmp.baud_base = 9600;
2089         tmp.close_delay = 5 * HZ;
2090         tmp.closing_wait = 30 * HZ;
2091
2092         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2093                 return -EFAULT;
2094         return 0;
2095 }
2096
2097 /*****************************************************************************
2098  * SerialIoctl
2099  *      this function handles any ioctl calls to the driver
2100  *****************************************************************************/
2101
2102 static int mos7840_ioctl(struct tty_struct *tty,
2103                          unsigned int cmd, unsigned long arg)
2104 {
2105         struct usb_serial_port *port = tty->driver_data;
2106         void __user *argp = (void __user *)arg;
2107         struct moschip_port *mos7840_port;
2108
2109         if (mos7840_port_paranoia_check(port, __func__))
2110                 return -1;
2111
2112         mos7840_port = mos7840_get_port_private(port);
2113
2114         if (mos7840_port == NULL)
2115                 return -1;
2116
2117         dev_dbg(&port->dev, "%s - cmd = 0x%x\n", __func__, cmd);
2118
2119         switch (cmd) {
2120                 /* return number of bytes available */
2121
2122         case TIOCSERGETLSR:
2123                 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
2124                 return mos7840_get_lsr_info(tty, argp);
2125
2126         case TIOCGSERIAL:
2127                 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
2128                 return mos7840_get_serial_info(mos7840_port, argp);
2129
2130         case TIOCSSERIAL:
2131                 dev_dbg(&port->dev, "%s TIOCSSERIAL\n", __func__);
2132                 break;
2133         default:
2134                 break;
2135         }
2136         return -ENOIOCTLCMD;
2137 }
2138
2139 static int mos7810_check(struct usb_serial *serial)
2140 {
2141         int i, pass_count = 0;
2142         u8 *buf;
2143         __u16 data = 0, mcr_data = 0;
2144         __u16 test_pattern = 0x55AA;
2145         int res;
2146
2147         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2148         if (!buf)
2149                 return 0;       /* failed to identify 7810 */
2150
2151         /* Store MCR setting */
2152         res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2153                 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
2154                 buf, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2155         if (res == VENDOR_READ_LENGTH)
2156                 mcr_data = *buf;
2157
2158         for (i = 0; i < 16; i++) {
2159                 /* Send the 1-bit test pattern out to MCS7810 test pin */
2160                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2161                         MCS_WRREQ, MCS_WR_RTYPE,
2162                         (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
2163                         MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
2164
2165                 /* Read the test pattern back */
2166                 res = usb_control_msg(serial->dev,
2167                                 usb_rcvctrlpipe(serial->dev, 0), MCS_RDREQ,
2168                                 MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2169                                 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2170                 if (res == VENDOR_READ_LENGTH)
2171                         data = *buf;
2172
2173                 /* If this is a MCS7810 device, both test patterns must match */
2174                 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
2175                         break;
2176
2177                 pass_count++;
2178         }
2179
2180         /* Restore MCR setting */
2181         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
2182                 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
2183                 0, MOS_WDR_TIMEOUT);
2184
2185         kfree(buf);
2186
2187         if (pass_count == 16)
2188                 return 1;
2189
2190         return 0;
2191 }
2192
2193 static int mos7840_probe(struct usb_serial *serial,
2194                                 const struct usb_device_id *id)
2195 {
2196         u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
2197         u8 *buf;
2198         int device_type;
2199
2200         if (product == MOSCHIP_DEVICE_ID_7810 ||
2201                 product == MOSCHIP_DEVICE_ID_7820) {
2202                 device_type = product;
2203                 goto out;
2204         }
2205
2206         buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2207         if (!buf)
2208                 return -ENOMEM;
2209
2210         usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2211                         MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2212                         VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2213
2214         /* For a MCS7840 device GPIO0 must be set to 1 */
2215         if (buf[0] & 0x01)
2216                 device_type = MOSCHIP_DEVICE_ID_7840;
2217         else if (mos7810_check(serial))
2218                 device_type = MOSCHIP_DEVICE_ID_7810;
2219         else
2220                 device_type = MOSCHIP_DEVICE_ID_7820;
2221
2222         kfree(buf);
2223 out:
2224         usb_set_serial_data(serial, (void *)(unsigned long)device_type);
2225
2226         return 0;
2227 }
2228
2229 static int mos7840_calc_num_ports(struct usb_serial *serial)
2230 {
2231         int device_type = (unsigned long)usb_get_serial_data(serial);
2232         int mos7840_num_ports;
2233
2234         mos7840_num_ports = (device_type >> 4) & 0x000F;
2235
2236         return mos7840_num_ports;
2237 }
2238
2239 static int mos7840_port_probe(struct usb_serial_port *port)
2240 {
2241         struct usb_serial *serial = port->serial;
2242         int device_type = (unsigned long)usb_get_serial_data(serial);
2243         struct moschip_port *mos7840_port;
2244         int status;
2245         int pnum;
2246         __u16 Data;
2247
2248         /* we set up the pointers to the endpoints in the mos7840_open *
2249          * function, as the structures aren't created yet.             */
2250
2251         pnum = port->port_number;
2252
2253         dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
2254         mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2255         if (mos7840_port == NULL) {
2256                 dev_err(&port->dev, "%s - Out of memory\n", __func__);
2257                 return -ENOMEM;
2258         }
2259
2260         /* Initialize all port interrupt end point to port 0 int
2261          * endpoint. Our device has only one interrupt end point
2262          * common to all port */
2263
2264         mos7840_port->port = port;
2265         mos7840_set_port_private(port, mos7840_port);
2266         spin_lock_init(&mos7840_port->pool_lock);
2267
2268         /* minor is not initialised until later by
2269          * usb-serial.c:get_free_serial() and cannot therefore be used
2270          * to index device instances */
2271         mos7840_port->port_num = pnum + 1;
2272         dev_dbg(&port->dev, "port->minor = %d\n", port->minor);
2273         dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
2274
2275         if (mos7840_port->port_num == 1) {
2276                 mos7840_port->SpRegOffset = 0x0;
2277                 mos7840_port->ControlRegOffset = 0x1;
2278                 mos7840_port->DcrRegOffset = 0x4;
2279         } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 4)) {
2280                 mos7840_port->SpRegOffset = 0x8;
2281                 mos7840_port->ControlRegOffset = 0x9;
2282                 mos7840_port->DcrRegOffset = 0x16;
2283         } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 2)) {
2284                 mos7840_port->SpRegOffset = 0xa;
2285                 mos7840_port->ControlRegOffset = 0xb;
2286                 mos7840_port->DcrRegOffset = 0x19;
2287         } else if ((mos7840_port->port_num == 3) && (serial->num_ports == 4)) {
2288                 mos7840_port->SpRegOffset = 0xa;
2289                 mos7840_port->ControlRegOffset = 0xb;
2290                 mos7840_port->DcrRegOffset = 0x19;
2291         } else if ((mos7840_port->port_num == 4) && (serial->num_ports == 4)) {
2292                 mos7840_port->SpRegOffset = 0xc;
2293                 mos7840_port->ControlRegOffset = 0xd;
2294                 mos7840_port->DcrRegOffset = 0x1c;
2295         }
2296         mos7840_dump_serial_port(port, mos7840_port);
2297         mos7840_set_port_private(port, mos7840_port);
2298
2299         /* enable rx_disable bit in control register */
2300         status = mos7840_get_reg_sync(port,
2301                         mos7840_port->ControlRegOffset, &Data);
2302         if (status < 0) {
2303                 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
2304                 goto out;
2305         } else
2306                 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
2307         Data |= 0x08;   /* setting driver done bit */
2308         Data |= 0x04;   /* sp1_bit to have cts change reflect in
2309                            modem status reg */
2310
2311         /* Data |= 0x20; //rx_disable bit */
2312         status = mos7840_set_reg_sync(port,
2313                         mos7840_port->ControlRegOffset, Data);
2314         if (status < 0) {
2315                 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2316                 goto out;
2317         } else
2318                 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
2319
2320         /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2321            and 0x24 in DCR3 */
2322         Data = 0x01;
2323         status = mos7840_set_reg_sync(port,
2324                         (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2325         if (status < 0) {
2326                 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
2327                 goto out;
2328         } else
2329                 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
2330
2331         Data = 0x05;
2332         status = mos7840_set_reg_sync(port,
2333                         (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2334         if (status < 0) {
2335                 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
2336                 goto out;
2337         } else
2338                 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
2339
2340         Data = 0x24;
2341         status = mos7840_set_reg_sync(port,
2342                         (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2343         if (status < 0) {
2344                 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
2345                 goto out;
2346         } else
2347                 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
2348
2349         /* write values in clkstart0x0 and clkmulti 0x20 */
2350         Data = 0x0;
2351         status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
2352         if (status < 0) {
2353                 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2354                 goto out;
2355         } else
2356                 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2357
2358         Data = 0x20;
2359         status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
2360         if (status < 0) {
2361                 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
2362                 goto error;
2363         } else
2364                 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
2365
2366         /* write value 0x0 to scratchpad register */
2367         Data = 0x00;
2368         status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
2369         if (status < 0) {
2370                 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
2371                 goto out;
2372         } else
2373                 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
2374
2375         /* Zero Length flag register */
2376         if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
2377                 Data = 0xff;
2378                 status = mos7840_set_reg_sync(port,
2379                                 (__u16) (ZLP_REG1 +
2380                                         ((__u16)mos7840_port->port_num)), Data);
2381                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2382                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
2383                 if (status < 0) {
2384                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
2385                         goto out;
2386                 } else
2387                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
2388         } else {
2389                 Data = 0xff;
2390                 status = mos7840_set_reg_sync(port,
2391                                 (__u16) (ZLP_REG1 +
2392                                         ((__u16)mos7840_port->port_num) - 0x1), Data);
2393                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2394                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
2395                 if (status < 0) {
2396                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
2397                         goto out;
2398                 } else
2399                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
2400
2401         }
2402         mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2403         mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2404         mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2405                         GFP_KERNEL);
2406         if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2407                         !mos7840_port->dr) {
2408                 status = -ENOMEM;
2409                 goto error;
2410         }
2411
2412         mos7840_port->has_led = false;
2413
2414         /* Initialize LED timers */
2415         if (device_type == MOSCHIP_DEVICE_ID_7810) {
2416                 mos7840_port->has_led = true;
2417
2418                 mos7840_port->led_urb = usb_alloc_urb(0, GFP_KERNEL);
2419                 mos7840_port->led_dr = kmalloc(sizeof(*mos7840_port->led_dr),
2420                                                                 GFP_KERNEL);
2421                 if (!mos7840_port->led_urb || !mos7840_port->led_dr) {
2422                         status = -ENOMEM;
2423                         goto error;
2424                 }
2425
2426                 init_timer(&mos7840_port->led_timer1);
2427                 mos7840_port->led_timer1.function = mos7840_led_off;
2428                 mos7840_port->led_timer1.expires =
2429                         jiffies + msecs_to_jiffies(LED_ON_MS);
2430                 mos7840_port->led_timer1.data = (unsigned long)mos7840_port;
2431
2432                 init_timer(&mos7840_port->led_timer2);
2433                 mos7840_port->led_timer2.function = mos7840_led_flag_off;
2434                 mos7840_port->led_timer2.expires =
2435                         jiffies + msecs_to_jiffies(LED_OFF_MS);
2436                 mos7840_port->led_timer2.data = (unsigned long)mos7840_port;
2437
2438                 /* Turn off LED */
2439                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2440         }
2441 out:
2442         if (pnum == serial->num_ports - 1) {
2443                 /* Zero Length flag enable */
2444                 Data = 0x0f;
2445                 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2446                 if (status < 0) {
2447                         dev_dbg(&port->dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
2448                         goto error;
2449                 } else
2450                         dev_dbg(&port->dev, "ZLP_REG5 Writing success status%d\n", status);
2451
2452                 /* setting configuration feature to one */
2453                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2454                                 0x03, 0x00, 0x01, 0x00, NULL, 0x00,
2455                                 MOS_WDR_TIMEOUT);
2456         }
2457         return 0;
2458 error:
2459         kfree(mos7840_port->led_dr);
2460         usb_free_urb(mos7840_port->led_urb);
2461         kfree(mos7840_port->dr);
2462         kfree(mos7840_port->ctrl_buf);
2463         usb_free_urb(mos7840_port->control_urb);
2464         kfree(mos7840_port);
2465
2466         return status;
2467 }
2468
2469 static int mos7840_port_remove(struct usb_serial_port *port)
2470 {
2471         struct moschip_port *mos7840_port;
2472
2473         mos7840_port = mos7840_get_port_private(port);
2474
2475         if (mos7840_port->has_led) {
2476                 /* Turn off LED */
2477                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2478
2479                 del_timer_sync(&mos7840_port->led_timer1);
2480                 del_timer_sync(&mos7840_port->led_timer2);
2481
2482                 usb_kill_urb(mos7840_port->led_urb);
2483                 usb_free_urb(mos7840_port->led_urb);
2484                 kfree(mos7840_port->led_dr);
2485         }
2486         usb_kill_urb(mos7840_port->control_urb);
2487         usb_free_urb(mos7840_port->control_urb);
2488         kfree(mos7840_port->ctrl_buf);
2489         kfree(mos7840_port->dr);
2490         kfree(mos7840_port);
2491
2492         return 0;
2493 }
2494
2495 static struct usb_serial_driver moschip7840_4port_device = {
2496         .driver = {
2497                    .owner = THIS_MODULE,
2498                    .name = "mos7840",
2499                    },
2500         .description = DRIVER_DESC,
2501         .id_table = id_table,
2502         .num_ports = 4,
2503         .open = mos7840_open,
2504         .close = mos7840_close,
2505         .write = mos7840_write,
2506         .write_room = mos7840_write_room,
2507         .chars_in_buffer = mos7840_chars_in_buffer,
2508         .throttle = mos7840_throttle,
2509         .unthrottle = mos7840_unthrottle,
2510         .calc_num_ports = mos7840_calc_num_ports,
2511         .probe = mos7840_probe,
2512         .ioctl = mos7840_ioctl,
2513         .set_termios = mos7840_set_termios,
2514         .break_ctl = mos7840_break,
2515         .tiocmget = mos7840_tiocmget,
2516         .tiocmset = mos7840_tiocmset,
2517         .tiocmiwait = usb_serial_generic_tiocmiwait,
2518         .get_icount = usb_serial_generic_get_icount,
2519         .port_probe = mos7840_port_probe,
2520         .port_remove = mos7840_port_remove,
2521         .read_bulk_callback = mos7840_bulk_in_callback,
2522         .read_int_callback = mos7840_interrupt_callback,
2523 };
2524
2525 static struct usb_serial_driver * const serial_drivers[] = {
2526         &moschip7840_4port_device, NULL
2527 };
2528
2529 module_usb_serial_driver(serial_drivers, id_table);
2530
2531 MODULE_DESCRIPTION(DRIVER_DESC);
2532 MODULE_LICENSE("GPL");