drivers/usb/serial/mos7840.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  15  *
  16  * Clean ups from Moschip version and a few ioctl implementations by:
  17  *      Paul B Schroeder <pschroeder "at" uplogix "dot" com>
  18  *
  19  * Originally based on drivers/usb/serial/io_edgeport.c which is:
  20  *      Copyright (C) 2000 Inside Out Networks, All rights reserved.
  21  *      Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
  22  *
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/errno.h>
  27 #include <linux/init.h>
  28 #include <linux/slab.h>
  29 #include <linux/tty.h>
  30 #include <linux/tty_driver.h>
  31 #include <linux/tty_flip.h>
  32 #include <linux/module.h>
  33 #include <linux/serial.h>
  34 #include <linux/usb.h>
  35 #include <linux/usb/serial.h>
  36 #include <linux/uaccess.h>
  37
  38 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
  39
  40 /*
  41  * 16C50 UART register defines
  42  */
  43
  44 #define LCR_BITS_5             0x00     /* 5 bits/char */
  45 #define LCR_BITS_6             0x01     /* 6 bits/char */
  46 #define LCR_BITS_7             0x02     /* 7 bits/char */
  47 #define LCR_BITS_8             0x03     /* 8 bits/char */
  48 #define LCR_BITS_MASK          0x03     /* Mask for bits/char field */
  49
  50 #define LCR_STOP_1             0x00     /* 1 stop bit */
  51 #define LCR_STOP_1_5           0x04     /* 1.5 stop bits (if 5   bits/char) */
  52 #define LCR_STOP_2             0x04     /* 2 stop bits   (if 6-8 bits/char) */
  53 #define LCR_STOP_MASK          0x04     /* Mask for stop bits field */
  54
  55 #define LCR_PAR_NONE           0x00     /* No parity */
  56 #define LCR_PAR_ODD            0x08     /* Odd parity */
  57 #define LCR_PAR_EVEN           0x18     /* Even parity */
  58 #define LCR_PAR_MARK           0x28     /* Force parity bit to 1 */
  59 #define LCR_PAR_SPACE          0x38     /* Force parity bit to 0 */
  60 #define LCR_PAR_MASK           0x38     /* Mask for parity field */
  61
  62 #define LCR_SET_BREAK          0x40     /* Set Break condition */
  63 #define LCR_DL_ENABLE          0x80     /* Enable access to divisor latch */
  64
  65 #define MCR_DTR                0x01     /* Assert DTR */
  66 #define MCR_RTS                0x02     /* Assert RTS */
  67 #define MCR_OUT1               0x04     /* Loopback only: Sets state of RI */
  68 #define MCR_MASTER_IE          0x08     /* Enable interrupt outputs */
  69 #define MCR_LOOPBACK           0x10     /* Set internal (digital) loopback mode */
  70 #define MCR_XON_ANY            0x20     /* Enable any char to exit XOFF mode */
  71
  72 #define MOS7840_MSR_CTS        0x10     /* Current state of CTS */
  73 #define MOS7840_MSR_DSR        0x20     /* Current state of DSR */
  74 #define MOS7840_MSR_RI         0x40     /* Current state of RI */
  75 #define MOS7840_MSR_CD         0x80     /* Current state of CD */
  76
  77 /*
  78  * Defines used for sending commands to port
  79  */
  80
  81 #define MOS_WDR_TIMEOUT         5000    /* default urb timeout */
  82
  83 #define MOS_PORT1       0x0200
  84 #define MOS_PORT2       0x0300
  85 #define MOS_VENREG      0x0000
  86 #define MOS_MAX_PORT    0x02
  87 #define MOS_WRITE       0x0E
  88 #define MOS_READ        0x0D
  89
  90 /* Requests */
  91 #define MCS_RD_RTYPE    0xC0
  92 #define MCS_WR_RTYPE    0x40
  93 #define MCS_RDREQ       0x0D
  94 #define MCS_WRREQ       0x0E
  95 #define MCS_CTRL_TIMEOUT        500
  96 #define VENDOR_READ_LENGTH      (0x01)
  97
  98 #define MAX_NAME_LEN    64
  99
 100 #define ZLP_REG1  0x3A          /* Zero_Flag_Reg1    58 */
 101 #define ZLP_REG5  0x3E          /* Zero_Flag_Reg5    62 */
 102
 103 /* For higher baud Rates use TIOCEXBAUD */
 104 #define TIOCEXBAUD     0x5462
 105
 106 /* vendor id and device id defines */
 107
 108 /* The native mos7840/7820 component */
 109 #define USB_VENDOR_ID_MOSCHIP           0x9710
 110 #define MOSCHIP_DEVICE_ID_7840          0x7840
 111 #define MOSCHIP_DEVICE_ID_7820          0x7820
 112 #define MOSCHIP_DEVICE_ID_7810          0x7810
 113 /* The native component can have its vendor/device id's overridden
 114  * in vendor-specific implementations.  Such devices can be handled
 115  * by making a change here, in id_table.
 116  */
 117 #define USB_VENDOR_ID_BANDB              0x0856
 118 #define BANDB_DEVICE_ID_USO9ML2_2        0xAC22
 119 #define BANDB_DEVICE_ID_USO9ML2_2P       0xBC00
 120 #define BANDB_DEVICE_ID_USO9ML2_4        0xAC24
 121 #define BANDB_DEVICE_ID_USO9ML2_4P       0xBC01
 122 #define BANDB_DEVICE_ID_US9ML2_2         0xAC29
 123 #define BANDB_DEVICE_ID_US9ML2_4         0xAC30
 124 #define BANDB_DEVICE_ID_USPTL4_2         0xAC31
 125 #define BANDB_DEVICE_ID_USPTL4_4         0xAC32
 126 #define BANDB_DEVICE_ID_USOPTL4_2        0xAC42
 127 #define BANDB_DEVICE_ID_USOPTL4_2P       0xBC02
 128 #define BANDB_DEVICE_ID_USOPTL4_4        0xAC44
 129 #define BANDB_DEVICE_ID_USOPTL4_4P       0xBC03
 130 #define BANDB_DEVICE_ID_USOPTL2_4        0xAC24
 131
 132 /* This driver also supports
 133  * ATEN UC2324 device using Moschip MCS7840
 134  * ATEN UC2322 device using Moschip MCS7820
 135  */
 136 #define USB_VENDOR_ID_ATENINTL          0x0557
 137 #define ATENINTL_DEVICE_ID_UC2324       0x2011
 138 #define ATENINTL_DEVICE_ID_UC2322       0x7820
 139
 140 /* Interrupt Routine Defines    */
 141
 142 #define SERIAL_IIR_RLS      0x06
 143 #define SERIAL_IIR_MS       0x00
 144
 145 /*
 146  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 147  */
 148 #define SERIAL_LSR_DR       0x0001
 149 #define SERIAL_LSR_OE       0x0002
 150 #define SERIAL_LSR_PE       0x0004
 151 #define SERIAL_LSR_FE       0x0008
 152 #define SERIAL_LSR_BI       0x0010
 153
 154 #define MOS_MSR_DELTA_CTS   0x10
 155 #define MOS_MSR_DELTA_DSR   0x20
 156 #define MOS_MSR_DELTA_RI    0x40
 157 #define MOS_MSR_DELTA_CD    0x80
 158
 159 /* Serial Port register Address */
 160 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 161 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 162 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 163 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 164 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 165 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 166 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 167 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 168 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 169
 170 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 171 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 172 #define GPIO_REGISTER              ((__u16)(0x07))
 173
 174 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 175
 176 /*
 177  * URB POOL related defines
 178  */
 179 #define NUM_URBS                        16      /* URB Count */
 180 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 181
 182 /* LED on/off milliseconds*/
 183 #define LED_ON_MS       500
 184 #define LED_OFF_MS      500
 185
 186 static int device_type;
 187
 188 static const struct usb_device_id id_table[] = {
 189         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 190         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 191         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
 192         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
 193         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
 194         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 195         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
 196         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 197         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 198         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 199         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 200         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 201         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
 202         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 203         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
 204         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
 205         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 206         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 207         {}                      /* terminating entry */
 208 };
 209 MODULE_DEVICE_TABLE(usb, id_table);
 210
 211 /* This structure holds all of the local port information */
 212
 213 struct moschip_port {
 214         int port_num;           /*Actual port number in the device(1,2,etc) */
 215         struct urb *write_urb;  /* write URB for this port */
 216         struct urb *read_urb;   /* read URB for this port */
 217         __u8 shadowLCR;         /* last LCR value received */
 218         __u8 shadowMCR;         /* last MCR value received */
 219         char open;
 220         char open_ports;
 221         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 222         wait_queue_head_t delta_msr_wait;       /* for handling sleeping while waiting for msr change to happen */
 223         int delta_msr_cond;
 224         struct async_icount icount;
 225         struct usb_serial_port *port;   /* loop back to the owner of this object */
 226
 227         /* Offsets */
 228         __u8 SpRegOffset;
 229         __u8 ControlRegOffset;
 230         __u8 DcrRegOffset;
 231         /* for processing control URBS in interrupt context */
 232         struct urb *control_urb;
 233         struct usb_ctrlrequest *dr;
 234         char *ctrl_buf;
 235         int MsrLsr;
 236
 237         spinlock_t pool_lock;
 238         struct urb *write_urb_pool[NUM_URBS];
 239         char busy[NUM_URBS];
 240         bool read_urb_busy;
 241
 242         /* For device(s) with LED indicator */
 243         bool has_led;
 244         bool led_flag;
 245         struct timer_list led_timer1;   /* Timer for LED on */
 246         struct timer_list led_timer2;   /* Timer for LED off */
 247 };
 248
 249 /*
 250  * mos7840_set_reg_sync
 251  *      To set the Control register by calling usb_fill_control_urb function
 252  *      by passing usb_sndctrlpipe function as parameter.
 253  */
 254
 255 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 256                                 __u16 val)
 257 {
 258         struct usb_device *dev = port->serial->dev;
 259         val = val & 0x00ff;
 260         dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
 261
 262         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 263                                MCS_WR_RTYPE, val, reg, NULL, 0,
 264                                MOS_WDR_TIMEOUT);
 265 }
 266
 267 /*
 268  * mos7840_get_reg_sync
 269  *      To set the Uart register by calling usb_fill_control_urb function by
 270  *      passing usb_rcvctrlpipe function as parameter.
 271  */
 272
 273 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 274                                 __u16 *val)
 275 {
 276         struct usb_device *dev = port->serial->dev;
 277         int ret = 0;
 278         u8 *buf;
 279
 280         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 281         if (!buf)
 282                 return -ENOMEM;
 283
 284         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 285                               MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
 286                               MOS_WDR_TIMEOUT);
 287         *val = buf[0];
 288         dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
 289
 290         kfree(buf);
 291         return ret;
 292 }
 293
 294 /*
 295  * mos7840_set_uart_reg
 296  *      To set the Uart register by calling usb_fill_control_urb function by
 297  *      passing usb_sndctrlpipe function as parameter.
 298  */
 299
 300 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 301                                 __u16 val)
 302 {
 303
 304         struct usb_device *dev = port->serial->dev;
 305         val = val & 0x00ff;
 306         /* For the UART control registers, the application number need
 307            to be Or'ed */
 308         if (port->serial->num_ports == 4) {
 309                 val |= (((__u16) port->number -
 310                                 (__u16) (port->serial->minor)) + 1) << 8;
 311         } else {
 312                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 313                         val |= (((__u16) port->number -
 314                               (__u16) (port->serial->minor)) + 1) << 8;
 315                 } else {
 316                         val |= (((__u16) port->number -
 317                               (__u16) (port->serial->minor)) + 2) << 8;
 318                 }
 319         }
 320         dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
 321         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 322                                MCS_WR_RTYPE, val, reg, NULL, 0,
 323                                MOS_WDR_TIMEOUT);
 324
 325 }
 326
 327 /*
 328  * mos7840_get_uart_reg
 329  *      To set the Control register by calling usb_fill_control_urb function
 330  *      by passing usb_rcvctrlpipe function as parameter.
 331  */
 332 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 333                                 __u16 *val)
 334 {
 335         struct usb_device *dev = port->serial->dev;
 336         int ret = 0;
 337         __u16 Wval;
 338         u8 *buf;
 339
 340         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 341         if (!buf)
 342                 return -ENOMEM;
 343
 344         /* Wval  is same as application number */
 345         if (port->serial->num_ports == 4) {
 346                 Wval =
 347                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 348                      1) << 8;
 349         } else {
 350                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 351                         Wval = (((__u16) port->number -
 352                               (__u16) (port->serial->minor)) + 1) << 8;
 353                 } else {
 354                         Wval = (((__u16) port->number -
 355                               (__u16) (port->serial->minor)) + 2) << 8;
 356                 }
 357         }
 358         dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
 359         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 360                               MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
 361                               MOS_WDR_TIMEOUT);
 362         *val = buf[0];
 363
 364         kfree(buf);
 365         return ret;
 366 }
 367
 368 static void mos7840_dump_serial_port(struct usb_serial_port *port,
 369                                      struct moschip_port *mos7840_port)
 370 {
 371
 372         dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
 373         dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
 374         dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
 375
 376 }
 377
 378 /************************************************************************/
 379 /************************************************************************/
 380 /*             I N T E R F A C E   F U N C T I O N S                    */
 381 /*             I N T E R F A C E   F U N C T I O N S                    */
 382 /************************************************************************/
 383 /************************************************************************/
 384
 385 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 386                                             struct moschip_port *data)
 387 {
 388         usb_set_serial_port_data(port, (void *)data);
 389 }
 390
 391 static inline struct moschip_port *mos7840_get_port_private(struct
 392                                                             usb_serial_port
 393                                                             *port)
 394 {
 395         return (struct moschip_port *)usb_get_serial_port_data(port);
 396 }
 397
 398 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 399 {
 400         struct moschip_port *mos7840_port;
 401         struct async_icount *icount;
 402         mos7840_port = port;
 403         icount = &mos7840_port->icount;
 404         if (new_msr &
 405             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 406              MOS_MSR_DELTA_CD)) {
 407                 icount = &mos7840_port->icount;
 408
 409                 /* update input line counters */
 410                 if (new_msr & MOS_MSR_DELTA_CTS) {
 411                         icount->cts++;
 412                         smp_wmb();
 413                 }
 414                 if (new_msr & MOS_MSR_DELTA_DSR) {
 415                         icount->dsr++;
 416                         smp_wmb();
 417                 }
 418                 if (new_msr & MOS_MSR_DELTA_CD) {
 419                         icount->dcd++;
 420                         smp_wmb();
 421                 }
 422                 if (new_msr & MOS_MSR_DELTA_RI) {
 423                         icount->rng++;
 424                         smp_wmb();
 425                 }
 426         }
 427 }
 428
 429 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 430 {
 431         struct async_icount *icount;
 432
 433         if (new_lsr & SERIAL_LSR_BI) {
 434                 /*
 435                  * Parity and Framing errors only count if they
 436                  * occur exclusive of a break being
 437                  * received.
 438                  */
 439                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 440         }
 441
 442         /* update input line counters */
 443         icount = &port->icount;
 444         if (new_lsr & SERIAL_LSR_BI) {
 445                 icount->brk++;
 446                 smp_wmb();
 447         }
 448         if (new_lsr & SERIAL_LSR_OE) {
 449                 icount->overrun++;
 450                 smp_wmb();
 451         }
 452         if (new_lsr & SERIAL_LSR_PE) {
 453                 icount->parity++;
 454                 smp_wmb();
 455         }
 456         if (new_lsr & SERIAL_LSR_FE) {
 457                 icount->frame++;
 458                 smp_wmb();
 459         }
 460 }
 461
 462 /************************************************************************/
 463 /************************************************************************/
 464 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 465 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 466 /************************************************************************/
 467 /************************************************************************/
 468
 469 static void mos7840_control_callback(struct urb *urb)
 470 {
 471         unsigned char *data;
 472         struct moschip_port *mos7840_port;
 473         struct device *dev = &urb->dev->dev;
 474         __u8 regval = 0x0;
 475         int status = urb->status;
 476
 477         mos7840_port = urb->context;
 478
 479         switch (status) {
 480         case 0:
 481                 /* success */
 482                 break;
 483         case -ECONNRESET:
 484         case -ENOENT:
 485         case -ESHUTDOWN:
 486                 /* this urb is terminated, clean up */
 487                 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
 488                 return;
 489         default:
 490                 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
 491                 return;
 492         }
 493
 494         dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length);
 495         dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__,
 496                 mos7840_port->MsrLsr, mos7840_port->port_num);
 497         data = urb->transfer_buffer;
 498         regval = (__u8) data[0];
 499         dev_dbg(dev, "%s data is %x\n", __func__, regval);
 500         if (mos7840_port->MsrLsr == 0)
 501                 mos7840_handle_new_msr(mos7840_port, regval);
 502         else if (mos7840_port->MsrLsr == 1)
 503                 mos7840_handle_new_lsr(mos7840_port, regval);
 504 }
 505
 506 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 507                            __u16 *val)
 508 {
 509         struct usb_device *dev = mcs->port->serial->dev;
 510         struct usb_ctrlrequest *dr = mcs->dr;
 511         unsigned char *buffer = mcs->ctrl_buf;
 512         int ret;
 513
 514         dr->bRequestType = MCS_RD_RTYPE;
 515         dr->bRequest = MCS_RDREQ;
 516         dr->wValue = cpu_to_le16(Wval); /* 0 */
 517         dr->wIndex = cpu_to_le16(reg);
 518         dr->wLength = cpu_to_le16(2);
 519
 520         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 521                              (unsigned char *)dr, buffer, 2,
 522                              mos7840_control_callback, mcs);
 523         mcs->control_urb->transfer_buffer_length = 2;
 524         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 525         return ret;
 526 }
 527
 528 static void mos7840_set_led_callback(struct urb *urb)
 529 {
 530         switch (urb->status) {
 531         case 0:
 532                 /* Success */
 533                 break;
 534         case -ECONNRESET:
 535         case -ENOENT:
 536         case -ESHUTDOWN:
 537                 /* This urb is terminated, clean up */
 538                 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d",
 539                         __func__, urb->status);
 540                 break;
 541         default:
 542                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d",
 543                         __func__, urb->status);
 544         }
 545 }
 546
 547 static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
 548                                 __u16 reg)
 549 {
 550         struct usb_device *dev = mcs->port->serial->dev;
 551         struct usb_ctrlrequest *dr = mcs->dr;
 552
 553         dr->bRequestType = MCS_WR_RTYPE;
 554         dr->bRequest = MCS_WRREQ;
 555         dr->wValue = cpu_to_le16(wval);
 556         dr->wIndex = cpu_to_le16(reg);
 557         dr->wLength = cpu_to_le16(0);
 558
 559         usb_fill_control_urb(mcs->control_urb, dev, usb_sndctrlpipe(dev, 0),
 560                 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
 561
 562         usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 563 }
 564
 565 static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
 566                                 __u16 val)
 567 {
 568         struct usb_device *dev = port->serial->dev;
 569
 570         usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
 571                         val, reg, NULL, 0, MOS_WDR_TIMEOUT);
 572 }
 573
 574 static void mos7840_led_off(unsigned long arg)
 575 {
 576         struct moschip_port *mcs = (struct moschip_port *) arg;
 577
 578         /* Turn off LED */
 579         mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
 580         mod_timer(&mcs->led_timer2,
 581                                 jiffies + msecs_to_jiffies(LED_OFF_MS));
 582 }
 583
 584 static void mos7840_led_flag_off(unsigned long arg)
 585 {
 586         struct moschip_port *mcs = (struct moschip_port *) arg;
 587
 588         mcs->led_flag = false;
 589 }
 590
 591 /*****************************************************************************
 592  * mos7840_interrupt_callback
 593  *      this is the callback function for when we have received data on the
 594  *      interrupt endpoint.
 595  *****************************************************************************/
 596
 597 static void mos7840_interrupt_callback(struct urb *urb)
 598 {
 599         int result;
 600         int length;
 601         struct moschip_port *mos7840_port;
 602         struct usb_serial *serial;
 603         __u16 Data;
 604         unsigned char *data;
 605         __u8 sp[5], st;
 606         int i, rv = 0;
 607         __u16 wval, wreg = 0;
 608         int status = urb->status;
 609
 610         switch (status) {
 611         case 0:
 612                 /* success */
 613                 break;
 614         case -ECONNRESET:
 615         case -ENOENT:
 616         case -ESHUTDOWN:
 617                 /* this urb is terminated, clean up */
 618                 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
 619                         __func__, status);
 620                 return;
 621         default:
 622                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
 623                         __func__, status);
 624                 goto exit;
 625         }
 626
 627         length = urb->actual_length;
 628         data = urb->transfer_buffer;
 629
 630         serial = urb->context;
 631
 632         /* Moschip get 5 bytes
 633          * Byte 1 IIR Port 1 (port.number is 0)
 634          * Byte 2 IIR Port 2 (port.number is 1)
 635          * Byte 3 IIR Port 3 (port.number is 2)
 636          * Byte 4 IIR Port 4 (port.number is 3)
 637          * Byte 5 FIFO status for both */
 638
 639         if (length && length > 5) {
 640                 dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n");
 641                 return;
 642         }
 643
 644         sp[0] = (__u8) data[0];
 645         sp[1] = (__u8) data[1];
 646         sp[2] = (__u8) data[2];
 647         sp[3] = (__u8) data[3];
 648         st = (__u8) data[4];
 649
 650         for (i = 0; i < serial->num_ports; i++) {
 651                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 652                 wval =
 653                     (((__u16) serial->port[i]->number -
 654                       (__u16) (serial->minor)) + 1) << 8;
 655                 if (mos7840_port->open) {
 656                         if (sp[i] & 0x01) {
 657                                 dev_dbg(&urb->dev->dev, "SP%d No Interrupt !!!\n", i);
 658                         } else {
 659                                 switch (sp[i] & 0x0f) {
 660                                 case SERIAL_IIR_RLS:
 661                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Receiver status error or \n", i);
 662                                         dev_dbg(&urb->dev->dev, "address bit detected in 9-bit mode\n");
 663                                         mos7840_port->MsrLsr = 1;
 664                                         wreg = LINE_STATUS_REGISTER;
 665                                         break;
 666                                 case SERIAL_IIR_MS:
 667                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Modem status change\n", i);
 668                                         mos7840_port->MsrLsr = 0;
 669                                         wreg = MODEM_STATUS_REGISTER;
 670                                         break;
 671                                 }
 672                                 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 673                         }
 674                 }
 675         }
 676         if (!(rv < 0))
 677                 /* the completion handler for the control urb will resubmit */
 678                 return;
 679 exit:
 680         result = usb_submit_urb(urb, GFP_ATOMIC);
 681         if (result) {
 682                 dev_err(&urb->dev->dev,
 683                         "%s - Error %d submitting interrupt urb\n",
 684                         __func__, result);
 685         }
 686 }
 687
 688 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 689                                        const char *function)
 690 {
 691         if (!port) {
 692                 pr_debug("%s - port == NULL\n", function);
 693                 return -1;
 694         }
 695         if (!port->serial) {
 696                 pr_debug("%s - port->serial == NULL\n", function);
 697                 return -1;
 698         }
 699
 700         return 0;
 701 }
 702
 703 /* Inline functions to check the sanity of a pointer that is passed to us */
 704 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 705                                          const char *function)
 706 {
 707         if (!serial) {
 708                 pr_debug("%s - serial == NULL\n", function);
 709                 return -1;
 710         }
 711         if (!serial->type) {
 712                 pr_debug("%s - serial->type == NULL!\n", function);
 713                 return -1;
 714         }
 715
 716         return 0;
 717 }
 718
 719 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 720                                                  const char *function)
 721 {
 722         /* if no port was specified, or it fails a paranoia check */
 723         if (!port ||
 724             mos7840_port_paranoia_check(port, function) ||
 725             mos7840_serial_paranoia_check(port->serial, function)) {
 726                 /* then say that we don't have a valid usb_serial thing,
 727                  * which will end up genrating -ENODEV return values */
 728                 return NULL;
 729         }
 730
 731         return port->serial;
 732 }
 733
 734 /*****************************************************************************
 735  * mos7840_bulk_in_callback
 736  *      this is the callback function for when we have received data on the
 737  *      bulk in endpoint.
 738  *****************************************************************************/
 739
 740 static void mos7840_bulk_in_callback(struct urb *urb)
 741 {
 742         int retval;
 743         unsigned char *data;
 744         struct usb_serial *serial;
 745         struct usb_serial_port *port;
 746         struct moschip_port *mos7840_port;
 747         int status = urb->status;
 748
 749         mos7840_port = urb->context;
 750         if (!mos7840_port)
 751                 return;
 752
 753         if (status) {
 754                 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
 755                 mos7840_port->read_urb_busy = false;
 756                 return;
 757         }
 758
 759         port = mos7840_port->port;
 760         if (mos7840_port_paranoia_check(port, __func__)) {
 761                 mos7840_port->read_urb_busy = false;
 762                 return;
 763         }
 764
 765         serial = mos7840_get_usb_serial(port, __func__);
 766         if (!serial) {
 767                 mos7840_port->read_urb_busy = false;
 768                 return;
 769         }
 770
 771         data = urb->transfer_buffer;
 772         usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
 773
 774         if (urb->actual_length) {
 775                 struct tty_port *tport = &mos7840_port->port->port;
 776                 tty_insert_flip_string(tport, data, urb->actual_length);
 777                 tty_flip_buffer_push(tport);
 778                 mos7840_port->icount.rx += urb->actual_length;
 779                 smp_wmb();
 780                 dev_dbg(&port->dev, "mos7840_port->icount.rx is %d:\n", mos7840_port->icount.rx);
 781         }
 782
 783         if (!mos7840_port->read_urb) {
 784                 dev_dbg(&port->dev, "%s", "URB KILLED !!!\n");
 785                 mos7840_port->read_urb_busy = false;
 786                 return;
 787         }
 788
 789         /* Turn on LED */
 790         if (mos7840_port->has_led && !mos7840_port->led_flag) {
 791                 mos7840_port->led_flag = true;
 792                 mos7840_set_led_async(mos7840_port, 0x0301,
 793                                         MODEM_CONTROL_REGISTER);
 794                 mod_timer(&mos7840_port->led_timer1,
 795                                 jiffies + msecs_to_jiffies(LED_ON_MS));
 796         }
 797
 798         mos7840_port->read_urb_busy = true;
 799         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 800
 801         if (retval) {
 802                 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
 803                 mos7840_port->read_urb_busy = false;
 804         }
 805 }
 806
 807 /*****************************************************************************
 808  * mos7840_bulk_out_data_callback
 809  *      this is the callback function for when we have finished sending
 810  *      serial data on the bulk out endpoint.
 811  *****************************************************************************/
 812
 813 static void mos7840_bulk_out_data_callback(struct urb *urb)
 814 {
 815         struct moschip_port *mos7840_port;
 816         struct usb_serial_port *port;
 817         int status = urb->status;
 818         int i;
 819
 820         mos7840_port = urb->context;
 821         port = mos7840_port->port;
 822         spin_lock(&mos7840_port->pool_lock);
 823         for (i = 0; i < NUM_URBS; i++) {
 824                 if (urb == mos7840_port->write_urb_pool[i]) {
 825                         mos7840_port->busy[i] = 0;
 826                         break;
 827                 }
 828         }
 829         spin_unlock(&mos7840_port->pool_lock);
 830
 831         if (status) {
 832                 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
 833                 return;
 834         }
 835
 836         if (mos7840_port_paranoia_check(port, __func__))
 837                 return;
 838
 839         if (mos7840_port->open)
 840                 tty_port_tty_wakeup(&port->port);
 841
 842 }
 843
 844 /************************************************************************/
 845 /*       D R I V E R  T T Y  I N T E R F A C E  F U N C T I O N S       */
 846 /************************************************************************/
 847 #ifdef MCSSerialProbe
 848 static int mos7840_serial_probe(struct usb_serial *serial,
 849                                 const struct usb_device_id *id)
 850 {
 851
 852         /*need to implement the mode_reg reading and updating\
 853            structures usb_serial_ device_type\
 854            (i.e num_ports, num_bulkin,bulkout etc) */
 855         /* Also we can update the changes  attach */
 856         return 1;
 857 }
 858 #endif
 859
 860 /*****************************************************************************
 861  * mos7840_open
 862  *      this function is called by the tty driver when a port is opened
 863  *      If successful, we return 0
 864  *      Otherwise we return a negative error number.
 865  *****************************************************************************/
 866
 867 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
 868 {
 869         int response;
 870         int j;
 871         struct usb_serial *serial;
 872         struct urb *urb;
 873         __u16 Data;
 874         int status;
 875         struct moschip_port *mos7840_port;
 876         struct moschip_port *port0;
 877
 878         if (mos7840_port_paranoia_check(port, __func__))
 879                 return -ENODEV;
 880
 881         serial = port->serial;
 882
 883         if (mos7840_serial_paranoia_check(serial, __func__))
 884                 return -ENODEV;
 885
 886         mos7840_port = mos7840_get_port_private(port);
 887         port0 = mos7840_get_port_private(serial->port[0]);
 888
 889         if (mos7840_port == NULL || port0 == NULL)
 890                 return -ENODEV;
 891
 892         usb_clear_halt(serial->dev, port->write_urb->pipe);
 893         usb_clear_halt(serial->dev, port->read_urb->pipe);
 894         port0->open_ports++;
 895
 896         /* Initialising the write urb pool */
 897         for (j = 0; j < NUM_URBS; ++j) {
 898                 urb = usb_alloc_urb(0, GFP_KERNEL);
 899                 mos7840_port->write_urb_pool[j] = urb;
 900
 901                 if (urb == NULL) {
 902                         dev_err(&port->dev, "No more urbs???\n");
 903                         continue;
 904                 }
 905
 906                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 907                                                                 GFP_KERNEL);
 908                 if (!urb->transfer_buffer) {
 909                         usb_free_urb(urb);
 910                         mos7840_port->write_urb_pool[j] = NULL;
 911                         dev_err(&port->dev,
 912                                 "%s-out of memory for urb buffers.\n",
 913                                 __func__);
 914                         continue;
 915                 }
 916         }
 917
 918 /*****************************************************************************
 919  * Initialize MCS7840 -- Write Init values to corresponding Registers
 920  *
 921  * Register Index
 922  * 1 : IER
 923  * 2 : FCR
 924  * 3 : LCR
 925  * 4 : MCR
 926  *
 927  * 0x08 : SP1/2 Control Reg
 928  *****************************************************************************/
 929
 930         /* NEED to check the following Block */
 931
 932         Data = 0x0;
 933         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 934         if (status < 0) {
 935                 dev_dbg(&port->dev, "Reading Spreg failed\n");
 936                 return -1;
 937         }
 938         Data |= 0x80;
 939         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 940         if (status < 0) {
 941                 dev_dbg(&port->dev, "writing Spreg failed\n");
 942                 return -1;
 943         }
 944
 945         Data &= ~0x80;
 946         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 947         if (status < 0) {
 948                 dev_dbg(&port->dev, "writing Spreg failed\n");
 949                 return -1;
 950         }
 951         /* End of block to be checked */
 952
 953         Data = 0x0;
 954         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 955                                                                         &Data);
 956         if (status < 0) {
 957                 dev_dbg(&port->dev, "Reading Controlreg failed\n");
 958                 return -1;
 959         }
 960         Data |= 0x08;           /* Driver done bit */
 961         Data |= 0x20;           /* rx_disable */
 962         status = mos7840_set_reg_sync(port,
 963                                 mos7840_port->ControlRegOffset, Data);
 964         if (status < 0) {
 965                 dev_dbg(&port->dev, "writing Controlreg failed\n");
 966                 return -1;
 967         }
 968         /* do register settings here */
 969         /* Set all regs to the device default values. */
 970         /***********************************
 971          * First Disable all interrupts.
 972          ***********************************/
 973         Data = 0x00;
 974         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 975         if (status < 0) {
 976                 dev_dbg(&port->dev, "disabling interrupts failed\n");
 977                 return -1;
 978         }
 979         /* Set FIFO_CONTROL_REGISTER to the default value */
 980         Data = 0x00;
 981         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 982         if (status < 0) {
 983                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
 984                 return -1;
 985         }
 986
 987         Data = 0xcf;
 988         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 989         if (status < 0) {
 990                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
 991                 return -1;
 992         }
 993
 994         Data = 0x03;
 995         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 996         mos7840_port->shadowLCR = Data;
 997
 998         Data = 0x0b;
 999         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1000         mos7840_port->shadowMCR = Data;
1001
1002         Data = 0x00;
1003         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1004         mos7840_port->shadowLCR = Data;
1005
1006         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1007         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1008
1009         Data = 0x0c;
1010         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1011
1012         Data = 0x0;
1013         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1014
1015         Data = 0x00;
1016         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1017
1018         Data = Data & ~SERIAL_LCR_DLAB;
1019         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1020         mos7840_port->shadowLCR = Data;
1021
1022         /* clearing Bulkin and Bulkout Fifo */
1023         Data = 0x0;
1024         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1025
1026         Data = Data | 0x0c;
1027         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1028
1029         Data = Data & ~0x0c;
1030         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1031         /* Finally enable all interrupts */
1032         Data = 0x0c;
1033         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1034
1035         /* clearing rx_disable */
1036         Data = 0x0;
1037         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1038                                                                         &Data);
1039         Data = Data & ~0x20;
1040         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1041                                                                         Data);
1042
1043         /* rx_negate */
1044         Data = 0x0;
1045         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1046                                                                         &Data);
1047         Data = Data | 0x10;
1048         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1049                                                                         Data);
1050
1051         /* Check to see if we've set up our endpoint info yet    *
1052          * (can't set it up in mos7840_startup as the structures *
1053          * were not set up at that time.)                        */
1054         if (port0->open_ports == 1) {
1055                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1056                         /* set up interrupt urb */
1057                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1058                                 serial->dev,
1059                                 usb_rcvintpipe(serial->dev,
1060                                 serial->port[0]->interrupt_in_endpointAddress),
1061                                 serial->port[0]->interrupt_in_buffer,
1062                                 serial->port[0]->interrupt_in_urb->
1063                                 transfer_buffer_length,
1064                                 mos7840_interrupt_callback,
1065                                 serial,
1066                                 serial->port[0]->interrupt_in_urb->interval);
1067
1068                         /* start interrupt read for mos7840               *
1069                          * will continue as long as mos7840 is connected  */
1070
1071                         response =
1072                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1073                                            GFP_KERNEL);
1074                         if (response) {
1075                                 dev_err(&port->dev, "%s - Error %d submitting "
1076                                         "interrupt urb\n", __func__, response);
1077                         }
1078
1079                 }
1080
1081         }
1082
1083         /* see if we've set up our endpoint info yet   *
1084          * (can't set it up in mos7840_startup as the  *
1085          * structures were not set up at that time.)   */
1086
1087         dev_dbg(&port->dev, "port number is %d\n", port->number);
1088         dev_dbg(&port->dev, "serial number is %d\n", port->serial->minor);
1089         dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
1090         dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
1091         dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
1092         dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
1093         mos7840_port->read_urb = port->read_urb;
1094
1095         /* set up our bulk in urb */
1096         if ((serial->num_ports == 2)
1097                 && ((((__u16)port->number -
1098                         (__u16)(port->serial->minor)) % 2) != 0)) {
1099                 usb_fill_bulk_urb(mos7840_port->read_urb,
1100                         serial->dev,
1101                         usb_rcvbulkpipe(serial->dev,
1102                                 (port->bulk_in_endpointAddress) + 2),
1103                         port->bulk_in_buffer,
1104                         mos7840_port->read_urb->transfer_buffer_length,
1105                         mos7840_bulk_in_callback, mos7840_port);
1106         } else {
1107                 usb_fill_bulk_urb(mos7840_port->read_urb,
1108                         serial->dev,
1109                         usb_rcvbulkpipe(serial->dev,
1110                                 port->bulk_in_endpointAddress),
1111                         port->bulk_in_buffer,
1112                         mos7840_port->read_urb->transfer_buffer_length,
1113                         mos7840_bulk_in_callback, mos7840_port);
1114         }
1115
1116         dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
1117         mos7840_port->read_urb_busy = true;
1118         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1119         if (response) {
1120                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1121                         __func__, response);
1122                 mos7840_port->read_urb_busy = false;
1123         }
1124
1125         /* initialize our wait queues */
1126         init_waitqueue_head(&mos7840_port->wait_chase);
1127         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1128
1129         /* initialize our icount structure */
1130         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1131
1132         /* initialize our port settings */
1133         /* Must set to enable ints! */
1134         mos7840_port->shadowMCR = MCR_MASTER_IE;
1135         /* send a open port command */
1136         mos7840_port->open = 1;
1137         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1138         mos7840_port->icount.tx = 0;
1139         mos7840_port->icount.rx = 0;
1140
1141         return 0;
1142 }
1143
1144 /*****************************************************************************
1145  * mos7840_chars_in_buffer
1146  *      this function is called by the tty driver when it wants to know how many
1147  *      bytes of data we currently have outstanding in the port (data that has
1148  *      been written, but hasn't made it out the port yet)
1149  *      If successful, we return the number of bytes left to be written in the
1150  *      system,
1151  *      Otherwise we return zero.
1152  *****************************************************************************/
1153
1154 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1155 {
1156         struct usb_serial_port *port = tty->driver_data;
1157         int i;
1158         int chars = 0;
1159         unsigned long flags;
1160         struct moschip_port *mos7840_port;
1161
1162         if (mos7840_port_paranoia_check(port, __func__))
1163                 return 0;
1164
1165         mos7840_port = mos7840_get_port_private(port);
1166         if (mos7840_port == NULL)
1167                 return 0;
1168
1169         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1170         for (i = 0; i < NUM_URBS; ++i) {
1171                 if (mos7840_port->busy[i]) {
1172                         struct urb *urb = mos7840_port->write_urb_pool[i];
1173                         chars += urb->transfer_buffer_length;
1174                 }
1175         }
1176         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1177         dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1178         return chars;
1179
1180 }
1181
1182 /*****************************************************************************
1183  * mos7840_close
1184  *      this function is called by the tty driver when a port is closed
1185  *****************************************************************************/
1186
1187 static void mos7840_close(struct usb_serial_port *port)
1188 {
1189         struct usb_serial *serial;
1190         struct moschip_port *mos7840_port;
1191         struct moschip_port *port0;
1192         int j;
1193         __u16 Data;
1194
1195         if (mos7840_port_paranoia_check(port, __func__))
1196                 return;
1197
1198         serial = mos7840_get_usb_serial(port, __func__);
1199         if (!serial)
1200                 return;
1201
1202         mos7840_port = mos7840_get_port_private(port);
1203         port0 = mos7840_get_port_private(serial->port[0]);
1204
1205         if (mos7840_port == NULL || port0 == NULL)
1206                 return;
1207
1208         for (j = 0; j < NUM_URBS; ++j)
1209                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1210
1211         /* Freeing Write URBs */
1212         for (j = 0; j < NUM_URBS; ++j) {
1213                 if (mos7840_port->write_urb_pool[j]) {
1214                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1215                                 kfree(mos7840_port->write_urb_pool[j]->
1216                                       transfer_buffer);
1217
1218                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1219                 }
1220         }
1221
1222         /* While closing port, shutdown all bulk read, write  *
1223          * and interrupt read if they exists                  */
1224         if (serial->dev) {
1225                 if (mos7840_port->write_urb) {
1226                         dev_dbg(&port->dev, "%s", "Shutdown bulk write\n");
1227                         usb_kill_urb(mos7840_port->write_urb);
1228                 }
1229                 if (mos7840_port->read_urb) {
1230                         dev_dbg(&port->dev, "%s", "Shutdown bulk read\n");
1231                         usb_kill_urb(mos7840_port->read_urb);
1232                         mos7840_port->read_urb_busy = false;
1233                 }
1234                 if ((&mos7840_port->control_urb)) {
1235                         dev_dbg(&port->dev, "%s", "Shutdown control read\n");
1236                         /*/      usb_kill_urb (mos7840_port->control_urb); */
1237                 }
1238         }
1239 /*      if(mos7840_port->ctrl_buf != NULL) */
1240 /*              kfree(mos7840_port->ctrl_buf); */
1241         port0->open_ports--;
1242         dev_dbg(&port->dev, "%s in close%d:in port%d\n", __func__, port0->open_ports, port->number);
1243         if (port0->open_ports == 0) {
1244                 if (serial->port[0]->interrupt_in_urb) {
1245                         dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n");
1246                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1247                 }
1248         }
1249
1250         if (mos7840_port->write_urb) {
1251                 /* if this urb had a transfer buffer already (old tx) free it */
1252                 if (mos7840_port->write_urb->transfer_buffer != NULL)
1253                         kfree(mos7840_port->write_urb->transfer_buffer);
1254                 usb_free_urb(mos7840_port->write_urb);
1255         }
1256
1257         Data = 0x0;
1258         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1259
1260         Data = 0x00;
1261         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1262
1263         mos7840_port->open = 0;
1264 }
1265
1266 /************************************************************************
1267  *
1268  * mos7840_block_until_chase_response
1269  *
1270  *      This function will block the close until one of the following:
1271  *              1. Response to our Chase comes from mos7840
1272  *              2. A timeout of 10 seconds without activity has expired
1273  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1274  *
1275  ************************************************************************/
1276
1277 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1278                                         struct moschip_port *mos7840_port)
1279 {
1280         int timeout = msecs_to_jiffies(1000);
1281         int wait = 10;
1282         int count;
1283
1284         while (1) {
1285                 count = mos7840_chars_in_buffer(tty);
1286
1287                 /* Check for Buffer status */
1288                 if (count <= 0)
1289                         return;
1290
1291                 /* Block the thread for a while */
1292                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1293                                                timeout);
1294                 /* No activity.. count down section */
1295                 wait--;
1296                 if (wait == 0) {
1297                         dev_dbg(&mos7840_port->port->dev, "%s - TIMEOUT\n", __func__);
1298                         return;
1299                 } else {
1300                         /* Reset timeout value back to seconds */
1301                         wait = 10;
1302                 }
1303         }
1304
1305 }
1306
1307 /*****************************************************************************
1308  * mos7840_break
1309  *      this function sends a break to the port
1310  *****************************************************************************/
1311 static void mos7840_break(struct tty_struct *tty, int break_state)
1312 {
1313         struct usb_serial_port *port = tty->driver_data;
1314         unsigned char data;
1315         struct usb_serial *serial;
1316         struct moschip_port *mos7840_port;
1317
1318         if (mos7840_port_paranoia_check(port, __func__))
1319                 return;
1320
1321         serial = mos7840_get_usb_serial(port, __func__);
1322         if (!serial)
1323                 return;
1324
1325         mos7840_port = mos7840_get_port_private(port);
1326
1327         if (mos7840_port == NULL)
1328                 return;
1329
1330         if (serial->dev)
1331                 /* flush and block until tx is empty */
1332                 mos7840_block_until_chase_response(tty, mos7840_port);
1333
1334         if (break_state == -1)
1335                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1336         else
1337                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1338
1339         /* FIXME: no locking on shadowLCR anywhere in driver */
1340         mos7840_port->shadowLCR = data;
1341         dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1342         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1343                              mos7840_port->shadowLCR);
1344 }
1345
1346 /*****************************************************************************
1347  * mos7840_write_room
1348  *      this function is called by the tty driver when it wants to know how many
1349  *      bytes of data we can accept for a specific port.
1350  *      If successful, we return the amount of room that we have for this port
1351  *      Otherwise we return a negative error number.
1352  *****************************************************************************/
1353
1354 static int mos7840_write_room(struct tty_struct *tty)
1355 {
1356         struct usb_serial_port *port = tty->driver_data;
1357         int i;
1358         int room = 0;
1359         unsigned long flags;
1360         struct moschip_port *mos7840_port;
1361
1362         if (mos7840_port_paranoia_check(port, __func__))
1363                 return -1;
1364
1365         mos7840_port = mos7840_get_port_private(port);
1366         if (mos7840_port == NULL)
1367                 return -1;
1368
1369         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1370         for (i = 0; i < NUM_URBS; ++i) {
1371                 if (!mos7840_port->busy[i])
1372                         room += URB_TRANSFER_BUFFER_SIZE;
1373         }
1374         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1375
1376         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1377         dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room);
1378         return room;
1379
1380 }
1381
1382 /*****************************************************************************
1383  * mos7840_write
1384  *      this function is called by the tty driver when data should be written to
1385  *      the port.
1386  *      If successful, we return the number of bytes written, otherwise we
1387  *      return a negative error number.
1388  *****************************************************************************/
1389
1390 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1391                          const unsigned char *data, int count)
1392 {
1393         int status;
1394         int i;
1395         int bytes_sent = 0;
1396         int transfer_size;
1397         unsigned long flags;
1398
1399         struct moschip_port *mos7840_port;
1400         struct usb_serial *serial;
1401         struct urb *urb;
1402         /* __u16 Data; */
1403         const unsigned char *current_position = data;
1404         unsigned char *data1;
1405
1406 #ifdef NOTMOS7840
1407         Data = 0x00;
1408         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1409         mos7840_port->shadowLCR = Data;
1410         dev_dbg(&port->dev, "%s: LINE_CONTROL_REGISTER is %x\n", __func__, Data);
1411         dev_dbg(&port->dev, "%s: mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1412
1413         /* Data = 0x03; */
1414         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1415         /* mos7840_port->shadowLCR=Data;//Need to add later */
1416
1417         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1418         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1419
1420         /* Data = 0x0c; */
1421         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1422         Data = 0x00;
1423         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1424         dev_dbg(&port->dev, "%s: DLL value is %x\n", __func__, Data);
1425
1426         Data = 0x0;
1427         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1428         dev_dbg(&port->dev, "%s: DLM value is %x\n", __func__, Data);
1429
1430         Data = Data & ~SERIAL_LCR_DLAB;
1431         dev_dbg(&port->dev, "%s: mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1432         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1433 #endif
1434
1435         if (mos7840_port_paranoia_check(port, __func__))
1436                 return -1;
1437
1438         serial = port->serial;
1439         if (mos7840_serial_paranoia_check(serial, __func__))
1440                 return -1;
1441
1442         mos7840_port = mos7840_get_port_private(port);
1443         if (mos7840_port == NULL)
1444                 return -1;
1445
1446         /* try to find a free urb in the list */
1447         urb = NULL;
1448
1449         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1450         for (i = 0; i < NUM_URBS; ++i) {
1451                 if (!mos7840_port->busy[i]) {
1452                         mos7840_port->busy[i] = 1;
1453                         urb = mos7840_port->write_urb_pool[i];
1454                         dev_dbg(&port->dev, "URB:%d\n", i);
1455                         break;
1456                 }
1457         }
1458         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1459
1460         if (urb == NULL) {
1461                 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1462                 goto exit;
1463         }
1464
1465         if (urb->transfer_buffer == NULL) {
1466                 urb->transfer_buffer =
1467                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1468
1469                 if (urb->transfer_buffer == NULL) {
1470                         dev_err_console(port, "%s no more kernel memory...\n",
1471                                 __func__);
1472                         goto exit;
1473                 }
1474         }
1475         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1476
1477         memcpy(urb->transfer_buffer, current_position, transfer_size);
1478
1479         /* fill urb with data and submit  */
1480         if ((serial->num_ports == 2)
1481                 && ((((__u16)port->number -
1482                         (__u16)(port->serial->minor)) % 2) != 0)) {
1483                 usb_fill_bulk_urb(urb,
1484                         serial->dev,
1485                         usb_sndbulkpipe(serial->dev,
1486                                 (port->bulk_out_endpointAddress) + 2),
1487                         urb->transfer_buffer,
1488                         transfer_size,
1489                         mos7840_bulk_out_data_callback, mos7840_port);
1490         } else {
1491                 usb_fill_bulk_urb(urb,
1492                         serial->dev,
1493                         usb_sndbulkpipe(serial->dev,
1494                                 port->bulk_out_endpointAddress),
1495                         urb->transfer_buffer,
1496                         transfer_size,
1497                         mos7840_bulk_out_data_callback, mos7840_port);
1498         }
1499
1500         data1 = urb->transfer_buffer;
1501         dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
1502
1503         /* Turn on LED */
1504         if (mos7840_port->has_led && !mos7840_port->led_flag) {
1505                 mos7840_port->led_flag = true;
1506                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0301);
1507                 mod_timer(&mos7840_port->led_timer1,
1508                                 jiffies + msecs_to_jiffies(LED_ON_MS));
1509         }
1510
1511         /* send it down the pipe */
1512         status = usb_submit_urb(urb, GFP_ATOMIC);
1513
1514         if (status) {
1515                 mos7840_port->busy[i] = 0;
1516                 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1517                         "with status = %d\n", __func__, status);
1518                 bytes_sent = status;
1519                 goto exit;
1520         }
1521         bytes_sent = transfer_size;
1522         mos7840_port->icount.tx += transfer_size;
1523         smp_wmb();
1524         dev_dbg(&port->dev, "mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx);
1525 exit:
1526         return bytes_sent;
1527
1528 }
1529
1530 /*****************************************************************************
1531  * mos7840_throttle
1532  *      this function is called by the tty driver when it wants to stop the data
1533  *      being read from the port.
1534  *****************************************************************************/
1535
1536 static void mos7840_throttle(struct tty_struct *tty)
1537 {
1538         struct usb_serial_port *port = tty->driver_data;
1539         struct moschip_port *mos7840_port;
1540         int status;
1541
1542         if (mos7840_port_paranoia_check(port, __func__))
1543                 return;
1544
1545         mos7840_port = mos7840_get_port_private(port);
1546
1547         if (mos7840_port == NULL)
1548                 return;
1549
1550         if (!mos7840_port->open) {
1551                 dev_dbg(&port->dev, "%s", "port not opened\n");
1552                 return;
1553         }
1554
1555         /* if we are implementing XON/XOFF, send the stop character */
1556         if (I_IXOFF(tty)) {
1557                 unsigned char stop_char = STOP_CHAR(tty);
1558                 status = mos7840_write(tty, port, &stop_char, 1);
1559                 if (status <= 0)
1560                         return;
1561         }
1562         /* if we are implementing RTS/CTS, toggle that line */
1563         if (tty->termios.c_cflag & CRTSCTS) {
1564                 mos7840_port->shadowMCR &= ~MCR_RTS;
1565                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1566                                          mos7840_port->shadowMCR);
1567                 if (status < 0)
1568                         return;
1569         }
1570 }
1571
1572 /*****************************************************************************
1573  * mos7840_unthrottle
1574  *      this function is called by the tty driver when it wants to resume
1575  *      the data being read from the port (called after mos7840_throttle is
1576  *      called)
1577  *****************************************************************************/
1578 static void mos7840_unthrottle(struct tty_struct *tty)
1579 {
1580         struct usb_serial_port *port = tty->driver_data;
1581         int status;
1582         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1583
1584         if (mos7840_port_paranoia_check(port, __func__))
1585                 return;
1586
1587         if (mos7840_port == NULL)
1588                 return;
1589
1590         if (!mos7840_port->open) {
1591                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1592                 return;
1593         }
1594
1595         /* if we are implementing XON/XOFF, send the start character */
1596         if (I_IXOFF(tty)) {
1597                 unsigned char start_char = START_CHAR(tty);
1598                 status = mos7840_write(tty, port, &start_char, 1);
1599                 if (status <= 0)
1600                         return;
1601         }
1602
1603         /* if we are implementing RTS/CTS, toggle that line */
1604         if (tty->termios.c_cflag & CRTSCTS) {
1605                 mos7840_port->shadowMCR |= MCR_RTS;
1606                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1607                                          mos7840_port->shadowMCR);
1608                 if (status < 0)
1609                         return;
1610         }
1611 }
1612
1613 static int mos7840_tiocmget(struct tty_struct *tty)
1614 {
1615         struct usb_serial_port *port = tty->driver_data;
1616         struct moschip_port *mos7840_port;
1617         unsigned int result;
1618         __u16 msr;
1619         __u16 mcr;
1620         int status;
1621         mos7840_port = mos7840_get_port_private(port);
1622
1623         if (mos7840_port == NULL)
1624                 return -ENODEV;
1625
1626         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1627         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1628         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1629             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1630             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1631             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1632             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1633             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1634             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1635
1636         dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1637
1638         return result;
1639 }
1640
1641 static int mos7840_tiocmset(struct tty_struct *tty,
1642                             unsigned int set, unsigned int clear)
1643 {
1644         struct usb_serial_port *port = tty->driver_data;
1645         struct moschip_port *mos7840_port;
1646         unsigned int mcr;
1647         int status;
1648
1649         mos7840_port = mos7840_get_port_private(port);
1650
1651         if (mos7840_port == NULL)
1652                 return -ENODEV;
1653
1654         /* FIXME: What locks the port registers ? */
1655         mcr = mos7840_port->shadowMCR;
1656         if (clear & TIOCM_RTS)
1657                 mcr &= ~MCR_RTS;
1658         if (clear & TIOCM_DTR)
1659                 mcr &= ~MCR_DTR;
1660         if (clear & TIOCM_LOOP)
1661                 mcr &= ~MCR_LOOPBACK;
1662
1663         if (set & TIOCM_RTS)
1664                 mcr |= MCR_RTS;
1665         if (set & TIOCM_DTR)
1666                 mcr |= MCR_DTR;
1667         if (set & TIOCM_LOOP)
1668                 mcr |= MCR_LOOPBACK;
1669
1670         mos7840_port->shadowMCR = mcr;
1671
1672         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1673         if (status < 0) {
1674                 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1675                 return status;
1676         }
1677
1678         return 0;
1679 }
1680
1681 /*****************************************************************************
1682  * mos7840_calc_baud_rate_divisor
1683  *      this function calculates the proper baud rate divisor for the specified
1684  *      baud rate.
1685  *****************************************************************************/
1686 static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1687                                           int baudRate, int *divisor,
1688                                           __u16 *clk_sel_val)
1689 {
1690         dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1691
1692         if (baudRate <= 115200) {
1693                 *divisor = 115200 / baudRate;
1694                 *clk_sel_val = 0x0;
1695         }
1696         if ((baudRate > 115200) && (baudRate <= 230400)) {
1697                 *divisor = 230400 / baudRate;
1698                 *clk_sel_val = 0x10;
1699         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1700                 *divisor = 403200 / baudRate;
1701                 *clk_sel_val = 0x20;
1702         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1703                 *divisor = 460800 / baudRate;
1704                 *clk_sel_val = 0x30;
1705         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1706                 *divisor = 806400 / baudRate;
1707                 *clk_sel_val = 0x40;
1708         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1709                 *divisor = 921600 / baudRate;
1710                 *clk_sel_val = 0x50;
1711         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1712                 *divisor = 1572864 / baudRate;
1713                 *clk_sel_val = 0x60;
1714         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1715                 *divisor = 3145728 / baudRate;
1716                 *clk_sel_val = 0x70;
1717         }
1718         return 0;
1719
1720 #ifdef NOTMCS7840
1721
1722         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1723                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1724                         *divisor = mos7840_divisor_table[i].Divisor;
1725                         return 0;
1726                 }
1727         }
1728
1729         /* After trying for all the standard baud rates    *
1730          * Try calculating the divisor for this baud rate  */
1731
1732         if (baudrate > 75 && baudrate < 230400) {
1733                 /* get the divisor */
1734                 custom = (__u16) (230400L / baudrate);
1735
1736                 /* Check for round off */
1737                 round1 = (__u16) (2304000L / baudrate);
1738                 round = (__u16) (round1 - (custom * 10));
1739                 if (round > 4)
1740                         custom++;
1741                 *divisor = custom;
1742
1743                 dev_dbg(&port->dev, " Baud %d = %d\n", baudrate, custom);
1744                 return 0;
1745         }
1746
1747         dev_dbg(&port->dev, "%s", " Baud calculation Failed...\n");
1748         return -1;
1749 #endif
1750 }
1751
1752 /*****************************************************************************
1753  * mos7840_send_cmd_write_baud_rate
1754  *      this function sends the proper command to change the baud rate of the
1755  *      specified port.
1756  *****************************************************************************/
1757
1758 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1759                                             int baudRate)
1760 {
1761         int divisor = 0;
1762         int status;
1763         __u16 Data;
1764         unsigned char number;
1765         __u16 clk_sel_val;
1766         struct usb_serial_port *port;
1767
1768         if (mos7840_port == NULL)
1769                 return -1;
1770
1771         port = mos7840_port->port;
1772         if (mos7840_port_paranoia_check(port, __func__))
1773                 return -1;
1774
1775         if (mos7840_serial_paranoia_check(port->serial, __func__))
1776                 return -1;
1777
1778         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1779
1780         dev_dbg(&port->dev, "%s - port = %d, baud = %d\n", __func__,
1781                 mos7840_port->port->number, baudRate);
1782         /* reset clk_uart_sel in spregOffset */
1783         if (baudRate > 115200) {
1784 #ifdef HW_flow_control
1785                 /* NOTE: need to see the pther register to modify */
1786                 /* setting h/w flow control bit to 1 */
1787                 Data = 0x2b;
1788                 mos7840_port->shadowMCR = Data;
1789                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1790                                                                         Data);
1791                 if (status < 0) {
1792                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1793                         return -1;
1794                 }
1795 #endif
1796
1797         } else {
1798 #ifdef HW_flow_control
1799                 /* setting h/w flow control bit to 0 */
1800                 Data = 0xb;
1801                 mos7840_port->shadowMCR = Data;
1802                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1803                                                                         Data);
1804                 if (status < 0) {
1805                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1806                         return -1;
1807                 }
1808 #endif
1809
1810         }
1811
1812         if (1) {                /* baudRate <= 115200) */
1813                 clk_sel_val = 0x0;
1814                 Data = 0x0;
1815                 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1816                                                    &clk_sel_val);
1817                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1818                                                                  &Data);
1819                 if (status < 0) {
1820                         dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1821                         return -1;
1822                 }
1823                 Data = (Data & 0x8f) | clk_sel_val;
1824                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1825                                                                 Data);
1826                 if (status < 0) {
1827                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1828                         return -1;
1829                 }
1830                 /* Calculate the Divisor */
1831
1832                 if (status) {
1833                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1834                         return status;
1835                 }
1836                 /* Enable access to divisor latch */
1837                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1838                 mos7840_port->shadowLCR = Data;
1839                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1840
1841                 /* Write the divisor */
1842                 Data = (unsigned char)(divisor & 0xff);
1843                 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1844                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1845
1846                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1847                 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1848                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1849
1850                 /* Disable access to divisor latch */
1851                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1852                 mos7840_port->shadowLCR = Data;
1853                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1854
1855         }
1856         return status;
1857 }
1858
1859 /*****************************************************************************
1860  * mos7840_change_port_settings
1861  *      This routine is called to set the UART on the device to match
1862  *      the specified new settings.
1863  *****************************************************************************/
1864
1865 static void mos7840_change_port_settings(struct tty_struct *tty,
1866         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1867 {
1868         int baud;
1869         unsigned cflag;
1870         unsigned iflag;
1871         __u8 lData;
1872         __u8 lParity;
1873         __u8 lStop;
1874         int status;
1875         __u16 Data;
1876         struct usb_serial_port *port;
1877         struct usb_serial *serial;
1878
1879         if (mos7840_port == NULL)
1880                 return;
1881
1882         port = mos7840_port->port;
1883
1884         if (mos7840_port_paranoia_check(port, __func__))
1885                 return;
1886
1887         if (mos7840_serial_paranoia_check(port->serial, __func__))
1888                 return;
1889
1890         serial = port->serial;
1891
1892         if (!mos7840_port->open) {
1893                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1894                 return;
1895         }
1896
1897         lData = LCR_BITS_8;
1898         lStop = LCR_STOP_1;
1899         lParity = LCR_PAR_NONE;
1900
1901         cflag = tty->termios.c_cflag;
1902         iflag = tty->termios.c_iflag;
1903
1904         /* Change the number of bits */
1905         if (cflag & CSIZE) {
1906                 switch (cflag & CSIZE) {
1907                 case CS5:
1908                         lData = LCR_BITS_5;
1909                         break;
1910
1911                 case CS6:
1912                         lData = LCR_BITS_6;
1913                         break;
1914
1915                 case CS7:
1916                         lData = LCR_BITS_7;
1917                         break;
1918                 default:
1919                 case CS8:
1920                         lData = LCR_BITS_8;
1921                         break;
1922                 }
1923         }
1924         /* Change the Parity bit */
1925         if (cflag & PARENB) {
1926                 if (cflag & PARODD) {
1927                         lParity = LCR_PAR_ODD;
1928                         dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1929                 } else {
1930                         lParity = LCR_PAR_EVEN;
1931                         dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1932                 }
1933
1934         } else {
1935                 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1936         }
1937
1938         if (cflag & CMSPAR)
1939                 lParity = lParity | 0x20;
1940
1941         /* Change the Stop bit */
1942         if (cflag & CSTOPB) {
1943                 lStop = LCR_STOP_2;
1944                 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1945         } else {
1946                 lStop = LCR_STOP_1;
1947                 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1948         }
1949
1950         /* Update the LCR with the correct value */
1951         mos7840_port->shadowLCR &=
1952             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1953         mos7840_port->shadowLCR |= (lData | lParity | lStop);
1954
1955         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1956                 mos7840_port->shadowLCR);
1957         /* Disable Interrupts */
1958         Data = 0x00;
1959         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1960
1961         Data = 0x00;
1962         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1963
1964         Data = 0xcf;
1965         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1966
1967         /* Send the updated LCR value to the mos7840 */
1968         Data = mos7840_port->shadowLCR;
1969
1970         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1971
1972         Data = 0x00b;
1973         mos7840_port->shadowMCR = Data;
1974         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1975         Data = 0x00b;
1976         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1977
1978         /* set up the MCR register and send it to the mos7840 */
1979
1980         mos7840_port->shadowMCR = MCR_MASTER_IE;
1981         if (cflag & CBAUD)
1982                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1983
1984         if (cflag & CRTSCTS)
1985                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1986         else
1987                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1988
1989         Data = mos7840_port->shadowMCR;
1990         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1991
1992         /* Determine divisor based on baud rate */
1993         baud = tty_get_baud_rate(tty);
1994
1995         if (!baud) {
1996                 /* pick a default, any default... */
1997                 dev_dbg(&port->dev, "%s", "Picked default baud...\n");
1998                 baud = 9600;
1999         }
2000
2001         dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
2002         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2003
2004         /* Enable Interrupts */
2005         Data = 0x0c;
2006         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2007
2008         if (mos7840_port->read_urb_busy == false) {
2009                 mos7840_port->read_urb_busy = true;
2010                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2011                 if (status) {
2012                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
2013                             status);
2014                         mos7840_port->read_urb_busy = false;
2015                 }
2016         }
2017         wake_up(&mos7840_port->delta_msr_wait);
2018         mos7840_port->delta_msr_cond = 1;
2019         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
2020                 mos7840_port->shadowLCR);
2021 }
2022
2023 /*****************************************************************************
2024  * mos7840_set_termios
2025  *      this function is called by the tty driver when it wants to change
2026  *      the termios structure
2027  *****************************************************************************/
2028
2029 static void mos7840_set_termios(struct tty_struct *tty,
2030                                 struct usb_serial_port *port,
2031                                 struct ktermios *old_termios)
2032 {
2033         int status;
2034         unsigned int cflag;
2035         struct usb_serial *serial;
2036         struct moschip_port *mos7840_port;
2037
2038         if (mos7840_port_paranoia_check(port, __func__))
2039                 return;
2040
2041         serial = port->serial;
2042
2043         if (mos7840_serial_paranoia_check(serial, __func__))
2044                 return;
2045
2046         mos7840_port = mos7840_get_port_private(port);
2047
2048         if (mos7840_port == NULL)
2049                 return;
2050
2051         if (!mos7840_port->open) {
2052                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
2053                 return;
2054         }
2055
2056         dev_dbg(&port->dev, "%s", "setting termios - \n");
2057
2058         cflag = tty->termios.c_cflag;
2059
2060         dev_dbg(&port->dev, "%s - clfag %08x iflag %08x\n", __func__,
2061                 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
2062         dev_dbg(&port->dev, "%s - old clfag %08x old iflag %08x\n", __func__,
2063                 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2064         dev_dbg(&port->dev, "%s - port %d\n", __func__, port->number);
2065
2066         /* change the port settings to the new ones specified */
2067
2068         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2069
2070         if (!mos7840_port->read_urb) {
2071                 dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n");
2072                 return;
2073         }
2074
2075         if (mos7840_port->read_urb_busy == false) {
2076                 mos7840_port->read_urb_busy = true;
2077                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2078                 if (status) {
2079                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
2080                             status);
2081                         mos7840_port->read_urb_busy = false;
2082                 }
2083         }
2084 }
2085
2086 /*****************************************************************************
2087  * mos7840_get_lsr_info - get line status register info
2088  *
2089  * Purpose: Let user call ioctl() to get info when the UART physically
2090  *          is emptied.  On bus types like RS485, the transmitter must
2091  *          release the bus after transmitting. This must be done when
2092  *          the transmit shift register is empty, not be done when the
2093  *          transmit holding register is empty.  This functionality
2094  *          allows an RS485 driver to be written in user space.
2095  *****************************************************************************/
2096
2097 static int mos7840_get_lsr_info(struct tty_struct *tty,
2098                                 unsigned int __user *value)
2099 {
2100         int count;
2101         unsigned int result = 0;
2102
2103         count = mos7840_chars_in_buffer(tty);
2104         if (count == 0)
2105                 result = TIOCSER_TEMT;
2106
2107         if (copy_to_user(value, &result, sizeof(int)))
2108                 return -EFAULT;
2109         return 0;
2110 }
2111
2112 /*****************************************************************************
2113  * mos7840_get_serial_info
2114  *      function to get information about serial port
2115  *****************************************************************************/
2116
2117 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2118                                    struct serial_struct __user *retinfo)
2119 {
2120         struct serial_struct tmp;
2121
2122         if (mos7840_port == NULL)
2123                 return -1;
2124
2125         if (!retinfo)
2126                 return -EFAULT;
2127
2128         memset(&tmp, 0, sizeof(tmp));
2129
2130         tmp.type = PORT_16550A;
2131         tmp.line = mos7840_port->port->serial->minor;
2132         tmp.port = mos7840_port->port->number;
2133         tmp.irq = 0;
2134         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2135         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2136         tmp.baud_base = 9600;
2137         tmp.close_delay = 5 * HZ;
2138         tmp.closing_wait = 30 * HZ;
2139
2140         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2141                 return -EFAULT;
2142         return 0;
2143 }
2144
2145 static int mos7840_get_icount(struct tty_struct *tty,
2146                         struct serial_icounter_struct *icount)
2147 {
2148         struct usb_serial_port *port = tty->driver_data;
2149         struct moschip_port *mos7840_port;
2150         struct async_icount cnow;
2151
2152         mos7840_port = mos7840_get_port_private(port);
2153         cnow = mos7840_port->icount;
2154
2155         smp_rmb();
2156         icount->cts = cnow.cts;
2157         icount->dsr = cnow.dsr;
2158         icount->rng = cnow.rng;
2159         icount->dcd = cnow.dcd;
2160         icount->rx = cnow.rx;
2161         icount->tx = cnow.tx;
2162         icount->frame = cnow.frame;
2163         icount->overrun = cnow.overrun;
2164         icount->parity = cnow.parity;
2165         icount->brk = cnow.brk;
2166         icount->buf_overrun = cnow.buf_overrun;
2167
2168         dev_dbg(&port->dev, "%s TIOCGICOUNT RX=%d, TX=%d\n", __func__,
2169                 icount->rx, icount->tx);
2170         return 0;
2171 }
2172
2173 /*****************************************************************************
2174  * SerialIoctl
2175  *      this function handles any ioctl calls to the driver
2176  *****************************************************************************/
2177
2178 static int mos7840_ioctl(struct tty_struct *tty,
2179                          unsigned int cmd, unsigned long arg)
2180 {
2181         struct usb_serial_port *port = tty->driver_data;
2182         void __user *argp = (void __user *)arg;
2183         struct moschip_port *mos7840_port;
2184
2185         struct async_icount cnow;
2186         struct async_icount cprev;
2187
2188         if (mos7840_port_paranoia_check(port, __func__))
2189                 return -1;
2190
2191         mos7840_port = mos7840_get_port_private(port);
2192
2193         if (mos7840_port == NULL)
2194                 return -1;
2195
2196         dev_dbg(&port->dev, "%s - cmd = 0x%x\n", __func__, cmd);
2197
2198         switch (cmd) {
2199                 /* return number of bytes available */
2200
2201         case TIOCSERGETLSR:
2202                 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
2203                 return mos7840_get_lsr_info(tty, argp);
2204
2205         case TIOCGSERIAL:
2206                 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
2207                 return mos7840_get_serial_info(mos7840_port, argp);
2208
2209         case TIOCSSERIAL:
2210                 dev_dbg(&port->dev, "%s TIOCSSERIAL\n", __func__);
2211                 break;
2212
2213         case TIOCMIWAIT:
2214                 dev_dbg(&port->dev, "%s  TIOCMIWAIT\n", __func__);
2215                 cprev = mos7840_port->icount;
2216                 while (1) {
2217                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2218                         mos7840_port->delta_msr_cond = 0;
2219                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2220                                                  (mos7840_port->
2221                                                   delta_msr_cond == 1));
2222
2223                         /* see if a signal did it */
2224                         if (signal_pending(current))
2225                                 return -ERESTARTSYS;
2226                         cnow = mos7840_port->icount;
2227                         smp_rmb();
2228                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2229                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2230                                 return -EIO;    /* no change => error */
2231                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2232                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2233                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2234                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2235                                 return 0;
2236                         }
2237                         cprev = cnow;
2238                 }
2239                 /* NOTREACHED */
2240                 break;
2241
2242         default:
2243                 break;
2244         }
2245         return -ENOIOCTLCMD;
2246 }
2247
2248 static int mos7810_check(struct usb_serial *serial)
2249 {
2250         int i, pass_count = 0;
2251         __u16 data = 0, mcr_data = 0;
2252         __u16 test_pattern = 0x55AA;
2253
2254         /* Store MCR setting */
2255         usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2256                 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
2257                 &mcr_data, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2258
2259         for (i = 0; i < 16; i++) {
2260                 /* Send the 1-bit test pattern out to MCS7810 test pin */
2261                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2262                         MCS_WRREQ, MCS_WR_RTYPE,
2263                         (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
2264                         MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
2265
2266                 /* Read the test pattern back */
2267                 usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2268                         MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &data,
2269                         VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2270
2271                 /* If this is a MCS7810 device, both test patterns must match */
2272                 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
2273                         break;
2274
2275                 pass_count++;
2276         }
2277
2278         /* Restore MCR setting */
2279         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
2280                 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
2281                 0, MOS_WDR_TIMEOUT);
2282
2283         if (pass_count == 16)
2284                 return 1;
2285
2286         return 0;
2287 }
2288
2289 static int mos7840_calc_num_ports(struct usb_serial *serial)
2290 {
2291         __u16 data = 0x00;
2292         int mos7840_num_ports;
2293
2294         usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2295                 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &data,
2296                 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2297
2298         if (serial->dev->descriptor.idProduct == MOSCHIP_DEVICE_ID_7810 ||
2299                 serial->dev->descriptor.idProduct == MOSCHIP_DEVICE_ID_7820) {
2300                 device_type = serial->dev->descriptor.idProduct;
2301         } else {
2302                 /* For a MCS7840 device GPIO0 must be set to 1 */
2303                 if ((data & 0x01) == 1)
2304                         device_type = MOSCHIP_DEVICE_ID_7840;
2305                 else if (mos7810_check(serial))
2306                         device_type = MOSCHIP_DEVICE_ID_7810;
2307                 else
2308                         device_type = MOSCHIP_DEVICE_ID_7820;
2309         }
2310
2311         mos7840_num_ports = (device_type >> 4) & 0x000F;
2312         serial->num_bulk_in = mos7840_num_ports;
2313         serial->num_bulk_out = mos7840_num_ports;
2314         serial->num_ports = mos7840_num_ports;
2315
2316         return mos7840_num_ports;
2317 }
2318
2319 static int mos7840_port_probe(struct usb_serial_port *port)
2320 {
2321         struct usb_serial *serial = port->serial;
2322         struct moschip_port *mos7840_port;
2323         int status;
2324         int pnum;
2325         __u16 Data;
2326
2327         /* we set up the pointers to the endpoints in the mos7840_open *
2328          * function, as the structures aren't created yet.             */
2329
2330         pnum = port->number - serial->minor;
2331
2332         dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
2333         mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2334         if (mos7840_port == NULL) {
2335                 dev_err(&port->dev, "%s - Out of memory\n", __func__);
2336                 return -ENOMEM;
2337         }
2338
2339         /* Initialize all port interrupt end point to port 0 int
2340          * endpoint. Our device has only one interrupt end point
2341          * common to all port */
2342
2343         mos7840_port->port = port;
2344         mos7840_set_port_private(port, mos7840_port);
2345         spin_lock_init(&mos7840_port->pool_lock);
2346
2347         /* minor is not initialised until later by
2348          * usb-serial.c:get_free_serial() and cannot therefore be used
2349          * to index device instances */
2350         mos7840_port->port_num = pnum + 1;
2351         dev_dbg(&port->dev, "port->number = %d\n", port->number);
2352         dev_dbg(&port->dev, "port->serial->minor = %d\n", port->serial->minor);
2353         dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
2354         dev_dbg(&port->dev, "serial->minor = %d\n", serial->minor);
2355
2356         if (mos7840_port->port_num == 1) {
2357                 mos7840_port->SpRegOffset = 0x0;
2358                 mos7840_port->ControlRegOffset = 0x1;
2359                 mos7840_port->DcrRegOffset = 0x4;
2360         } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 4)) {
2361                 mos7840_port->SpRegOffset = 0x8;
2362                 mos7840_port->ControlRegOffset = 0x9;
2363                 mos7840_port->DcrRegOffset = 0x16;
2364         } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 2)) {
2365                 mos7840_port->SpRegOffset = 0xa;
2366                 mos7840_port->ControlRegOffset = 0xb;
2367                 mos7840_port->DcrRegOffset = 0x19;
2368         } else if ((mos7840_port->port_num == 3) && (serial->num_ports == 4)) {
2369                 mos7840_port->SpRegOffset = 0xa;
2370                 mos7840_port->ControlRegOffset = 0xb;
2371                 mos7840_port->DcrRegOffset = 0x19;
2372         } else if ((mos7840_port->port_num == 4) && (serial->num_ports == 4)) {
2373                 mos7840_port->SpRegOffset = 0xc;
2374                 mos7840_port->ControlRegOffset = 0xd;
2375                 mos7840_port->DcrRegOffset = 0x1c;
2376         }
2377         mos7840_dump_serial_port(port, mos7840_port);
2378         mos7840_set_port_private(port, mos7840_port);
2379
2380         /* enable rx_disable bit in control register */
2381         status = mos7840_get_reg_sync(port,
2382                         mos7840_port->ControlRegOffset, &Data);
2383         if (status < 0) {
2384                 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
2385                 goto out;
2386         } else
2387                 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
2388         Data |= 0x08;   /* setting driver done bit */
2389         Data |= 0x04;   /* sp1_bit to have cts change reflect in
2390                            modem status reg */
2391
2392         /* Data |= 0x20; //rx_disable bit */
2393         status = mos7840_set_reg_sync(port,
2394                         mos7840_port->ControlRegOffset, Data);
2395         if (status < 0) {
2396                 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2397                 goto out;
2398         } else
2399                 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
2400
2401         /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2402            and 0x24 in DCR3 */
2403         Data = 0x01;
2404         status = mos7840_set_reg_sync(port,
2405                         (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2406         if (status < 0) {
2407                 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
2408                 goto out;
2409         } else
2410                 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
2411
2412         Data = 0x05;
2413         status = mos7840_set_reg_sync(port,
2414                         (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2415         if (status < 0) {
2416                 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
2417                 goto out;
2418         } else
2419                 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
2420
2421         Data = 0x24;
2422         status = mos7840_set_reg_sync(port,
2423                         (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2424         if (status < 0) {
2425                 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
2426                 goto out;
2427         } else
2428                 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
2429
2430         /* write values in clkstart0x0 and clkmulti 0x20 */
2431         Data = 0x0;
2432         status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
2433         if (status < 0) {
2434                 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2435                 goto out;
2436         } else
2437                 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2438
2439         Data = 0x20;
2440         status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
2441         if (status < 0) {
2442                 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
2443                 goto error;
2444         } else
2445                 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
2446
2447         /* write value 0x0 to scratchpad register */
2448         Data = 0x00;
2449         status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
2450         if (status < 0) {
2451                 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
2452                 goto out;
2453         } else
2454                 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
2455
2456         /* Zero Length flag register */
2457         if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
2458                 Data = 0xff;
2459                 status = mos7840_set_reg_sync(port,
2460                                 (__u16) (ZLP_REG1 +
2461                                         ((__u16)mos7840_port->port_num)), Data);
2462                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2463                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
2464                 if (status < 0) {
2465                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
2466                         goto out;
2467                 } else
2468                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
2469         } else {
2470                 Data = 0xff;
2471                 status = mos7840_set_reg_sync(port,
2472                                 (__u16) (ZLP_REG1 +
2473                                         ((__u16)mos7840_port->port_num) - 0x1), Data);
2474                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2475                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
2476                 if (status < 0) {
2477                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
2478                         goto out;
2479                 } else
2480                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
2481
2482         }
2483         mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2484         mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2485         mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2486                         GFP_KERNEL);
2487         if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2488                         !mos7840_port->dr) {
2489                 status = -ENOMEM;
2490                 goto error;
2491         }
2492
2493         mos7840_port->has_led = false;
2494
2495         /* Initialize LED timers */
2496         if (device_type == MOSCHIP_DEVICE_ID_7810) {
2497                 mos7840_port->has_led = true;
2498
2499                 init_timer(&mos7840_port->led_timer1);
2500                 mos7840_port->led_timer1.function = mos7840_led_off;
2501                 mos7840_port->led_timer1.expires =
2502                         jiffies + msecs_to_jiffies(LED_ON_MS);
2503                 mos7840_port->led_timer1.data = (unsigned long)mos7840_port;
2504
2505                 init_timer(&mos7840_port->led_timer2);
2506                 mos7840_port->led_timer2.function = mos7840_led_flag_off;
2507                 mos7840_port->led_timer2.expires =
2508                         jiffies + msecs_to_jiffies(LED_OFF_MS);
2509                 mos7840_port->led_timer2.data = (unsigned long)mos7840_port;
2510
2511                 mos7840_port->led_flag = false;
2512
2513                 /* Turn off LED */
2514                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2515         }
2516 out:
2517         if (pnum == serial->num_ports - 1) {
2518                 /* Zero Length flag enable */
2519                 Data = 0x0f;
2520                 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2521                 if (status < 0) {
2522                         dev_dbg(&port->dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
2523                         goto error;
2524                 } else
2525                         dev_dbg(&port->dev, "ZLP_REG5 Writing success status%d\n", status);
2526
2527                 /* setting configuration feature to one */
2528                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2529                                 0x03, 0x00, 0x01, 0x00, NULL, 0x00,
2530                                 MOS_WDR_TIMEOUT);
2531         }
2532         return 0;
2533 error:
2534         kfree(mos7840_port->dr);
2535         kfree(mos7840_port->ctrl_buf);
2536         usb_free_urb(mos7840_port->control_urb);
2537         kfree(mos7840_port);
2538
2539         return status;
2540 }
2541
2542 static int mos7840_port_remove(struct usb_serial_port *port)
2543 {
2544         struct moschip_port *mos7840_port;
2545
2546         mos7840_port = mos7840_get_port_private(port);
2547
2548         if (mos7840_port->has_led) {
2549                 /* Turn off LED */
2550                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2551
2552                 del_timer_sync(&mos7840_port->led_timer1);
2553                 del_timer_sync(&mos7840_port->led_timer2);
2554         }
2555         usb_kill_urb(mos7840_port->control_urb);
2556         usb_free_urb(mos7840_port->control_urb);
2557         kfree(mos7840_port->ctrl_buf);
2558         kfree(mos7840_port->dr);
2559         kfree(mos7840_port);
2560
2561         return 0;
2562 }
2563
2564 static struct usb_serial_driver moschip7840_4port_device = {
2565         .driver = {
2566                    .owner = THIS_MODULE,
2567                    .name = "mos7840",
2568                    },
2569         .description = DRIVER_DESC,
2570         .id_table = id_table,
2571         .num_ports = 4,
2572         .open = mos7840_open,
2573         .close = mos7840_close,
2574         .write = mos7840_write,
2575         .write_room = mos7840_write_room,
2576         .chars_in_buffer = mos7840_chars_in_buffer,
2577         .throttle = mos7840_throttle,
2578         .unthrottle = mos7840_unthrottle,
2579         .calc_num_ports = mos7840_calc_num_ports,
2580 #ifdef MCSSerialProbe
2581         .probe = mos7840_serial_probe,
2582 #endif
2583         .ioctl = mos7840_ioctl,
2584         .set_termios = mos7840_set_termios,
2585         .break_ctl = mos7840_break,
2586         .tiocmget = mos7840_tiocmget,
2587         .tiocmset = mos7840_tiocmset,
2588         .get_icount = mos7840_get_icount,
2589         .port_probe = mos7840_port_probe,
2590         .port_remove = mos7840_port_remove,
2591         .read_bulk_callback = mos7840_bulk_in_callback,
2592         .read_int_callback = mos7840_interrupt_callback,
2593 };
2594
2595 static struct usb_serial_driver * const serial_drivers[] = {
2596         &moschip7840_4port_device, NULL
2597 };
2598
2599 module_usb_serial_driver(serial_drivers, id_table);
2600
2601 MODULE_DESCRIPTION(DRIVER_DESC);
2602 MODULE_LICENSE("GPL");