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 /*
  39  * Version Information
  40  */
  41 #define DRIVER_VERSION "1.3.2"
  42 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
  43
  44 /*
  45  * 16C50 UART register defines
  46  */
  47
  48 #define LCR_BITS_5             0x00     /* 5 bits/char */
  49 #define LCR_BITS_6             0x01     /* 6 bits/char */
  50 #define LCR_BITS_7             0x02     /* 7 bits/char */
  51 #define LCR_BITS_8             0x03     /* 8 bits/char */
  52 #define LCR_BITS_MASK          0x03     /* Mask for bits/char field */
  53
  54 #define LCR_STOP_1             0x00     /* 1 stop bit */
  55 #define LCR_STOP_1_5           0x04     /* 1.5 stop bits (if 5   bits/char) */
  56 #define LCR_STOP_2             0x04     /* 2 stop bits   (if 6-8 bits/char) */
  57 #define LCR_STOP_MASK          0x04     /* Mask for stop bits field */
  58
  59 #define LCR_PAR_NONE           0x00     /* No parity */
  60 #define LCR_PAR_ODD            0x08     /* Odd parity */
  61 #define LCR_PAR_EVEN           0x18     /* Even parity */
  62 #define LCR_PAR_MARK           0x28     /* Force parity bit to 1 */
  63 #define LCR_PAR_SPACE          0x38     /* Force parity bit to 0 */
  64 #define LCR_PAR_MASK           0x38     /* Mask for parity field */
  65
  66 #define LCR_SET_BREAK          0x40     /* Set Break condition */
  67 #define LCR_DL_ENABLE          0x80     /* Enable access to divisor latch */
  68
  69 #define MCR_DTR                0x01     /* Assert DTR */
  70 #define MCR_RTS                0x02     /* Assert RTS */
  71 #define MCR_OUT1               0x04     /* Loopback only: Sets state of RI */
  72 #define MCR_MASTER_IE          0x08     /* Enable interrupt outputs */
  73 #define MCR_LOOPBACK           0x10     /* Set internal (digital) loopback mode */
  74 #define MCR_XON_ANY            0x20     /* Enable any char to exit XOFF mode */
  75
  76 #define MOS7840_MSR_CTS        0x10     /* Current state of CTS */
  77 #define MOS7840_MSR_DSR        0x20     /* Current state of DSR */
  78 #define MOS7840_MSR_RI         0x40     /* Current state of RI */
  79 #define MOS7840_MSR_CD         0x80     /* Current state of CD */
  80
  81 /*
  82  * Defines used for sending commands to port
  83  */
  84
  85 #define MOS_WDR_TIMEOUT         5000    /* default urb timeout */
  86
  87 #define MOS_PORT1       0x0200
  88 #define MOS_PORT2       0x0300
  89 #define MOS_VENREG      0x0000
  90 #define MOS_MAX_PORT    0x02
  91 #define MOS_WRITE       0x0E
  92 #define MOS_READ        0x0D
  93
  94 /* Requests */
  95 #define MCS_RD_RTYPE    0xC0
  96 #define MCS_WR_RTYPE    0x40
  97 #define MCS_RDREQ       0x0D
  98 #define MCS_WRREQ       0x0E
  99 #define MCS_CTRL_TIMEOUT        500
 100 #define VENDOR_READ_LENGTH      (0x01)
 101
 102 #define MAX_NAME_LEN    64
 103
 104 #define ZLP_REG1  0x3A          /* Zero_Flag_Reg1    58 */
 105 #define ZLP_REG5  0x3E          /* Zero_Flag_Reg5    62 */
 106
 107 /* For higher baud Rates use TIOCEXBAUD */
 108 #define TIOCEXBAUD     0x5462
 109
 110 /* vendor id and device id defines */
 111
 112 /* The native mos7840/7820 component */
 113 #define USB_VENDOR_ID_MOSCHIP           0x9710
 114 #define MOSCHIP_DEVICE_ID_7840          0x7840
 115 #define MOSCHIP_DEVICE_ID_7820          0x7820
 116 #define MOSCHIP_DEVICE_ID_7810          0x7810
 117 /* The native component can have its vendor/device id's overridden
 118  * in vendor-specific implementations.  Such devices can be handled
 119  * by making a change here, in id_table.
 120  */
 121 #define USB_VENDOR_ID_BANDB              0x0856
 122 #define BANDB_DEVICE_ID_USO9ML2_2        0xAC22
 123 #define BANDB_DEVICE_ID_USO9ML2_2P       0xBC00
 124 #define BANDB_DEVICE_ID_USO9ML2_4        0xAC24
 125 #define BANDB_DEVICE_ID_USO9ML2_4P       0xBC01
 126 #define BANDB_DEVICE_ID_US9ML2_2         0xAC29
 127 #define BANDB_DEVICE_ID_US9ML2_4         0xAC30
 128 #define BANDB_DEVICE_ID_USPTL4_2         0xAC31
 129 #define BANDB_DEVICE_ID_USPTL4_4         0xAC32
 130 #define BANDB_DEVICE_ID_USOPTL4_2        0xAC42
 131 #define BANDB_DEVICE_ID_USOPTL4_2P       0xBC02
 132 #define BANDB_DEVICE_ID_USOPTL4_4        0xAC44
 133 #define BANDB_DEVICE_ID_USOPTL4_4P       0xBC03
 134 #define BANDB_DEVICE_ID_USOPTL2_4        0xAC24
 135
 136 /* This driver also supports
 137  * ATEN UC2324 device using Moschip MCS7840
 138  * ATEN UC2322 device using Moschip MCS7820
 139  */
 140 #define USB_VENDOR_ID_ATENINTL          0x0557
 141 #define ATENINTL_DEVICE_ID_UC2324       0x2011
 142 #define ATENINTL_DEVICE_ID_UC2322       0x7820
 143
 144 /* Interrupt Routine Defines    */
 145
 146 #define SERIAL_IIR_RLS      0x06
 147 #define SERIAL_IIR_MS       0x00
 148
 149 /*
 150  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 151  */
 152 #define SERIAL_LSR_DR       0x0001
 153 #define SERIAL_LSR_OE       0x0002
 154 #define SERIAL_LSR_PE       0x0004
 155 #define SERIAL_LSR_FE       0x0008
 156 #define SERIAL_LSR_BI       0x0010
 157
 158 #define MOS_MSR_DELTA_CTS   0x10
 159 #define MOS_MSR_DELTA_DSR   0x20
 160 #define MOS_MSR_DELTA_RI    0x40
 161 #define MOS_MSR_DELTA_CD    0x80
 162
 163 /* Serial Port register Address */
 164 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 165 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 166 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 167 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 168 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 169 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 170 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 171 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 172 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 173
 174 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 175 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 176 #define GPIO_REGISTER              ((__u16)(0x07))
 177
 178 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 179
 180 /*
 181  * URB POOL related defines
 182  */
 183 #define NUM_URBS                        16      /* URB Count */
 184 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 185
 186 /* LED on/off milliseconds*/
 187 #define LED_ON_MS       500
 188 #define LED_OFF_MS      500
 189
 190 static int device_type;
 191
 192 static const struct usb_device_id id_table[] = {
 193         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 194         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 195         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
 196         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
 197         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
 198         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 199         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
 200         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 201         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 202         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 203         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 204         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 205         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
 206         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 207         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
 208         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
 209         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 210         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 211         {}                      /* terminating entry */
 212 };
 213 MODULE_DEVICE_TABLE(usb, id_table);
 214
 215 /* This structure holds all of the local port information */
 216
 217 struct moschip_port {
 218         int port_num;           /*Actual port number in the device(1,2,etc) */
 219         struct urb *write_urb;  /* write URB for this port */
 220         struct urb *read_urb;   /* read URB for this port */
 221         struct urb *int_urb;
 222         __u8 shadowLCR;         /* last LCR value received */
 223         __u8 shadowMCR;         /* last MCR value received */
 224         char open;
 225         char open_ports;
 226         char zombie;
 227         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 228         wait_queue_head_t delta_msr_wait;       /* for handling sleeping while waiting for msr change to happen */
 229         int delta_msr_cond;
 230         struct async_icount icount;
 231         struct usb_serial_port *port;   /* loop back to the owner of this object */
 232
 233         /* Offsets */
 234         __u8 SpRegOffset;
 235         __u8 ControlRegOffset;
 236         __u8 DcrRegOffset;
 237         /* for processing control URBS in interrupt context */
 238         struct urb *control_urb;
 239         struct usb_ctrlrequest *dr;
 240         char *ctrl_buf;
 241         int MsrLsr;
 242
 243         spinlock_t pool_lock;
 244         struct urb *write_urb_pool[NUM_URBS];
 245         char busy[NUM_URBS];
 246         bool read_urb_busy;
 247
 248         /* For device(s) with LED indicator */
 249         bool has_led;
 250         bool led_flag;
 251         struct timer_list led_timer1;   /* Timer for LED on */
 252         struct timer_list led_timer2;   /* Timer for LED off */
 253 };
 254
 255 /*
 256  * mos7840_set_reg_sync
 257  *      To set the Control register by calling usb_fill_control_urb function
 258  *      by passing usb_sndctrlpipe function as parameter.
 259  */
 260
 261 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 262                                 __u16 val)
 263 {
 264         struct usb_device *dev = port->serial->dev;
 265         val = val & 0x00ff;
 266         dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
 267
 268         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 269                                MCS_WR_RTYPE, val, reg, NULL, 0,
 270                                MOS_WDR_TIMEOUT);
 271 }
 272
 273 /*
 274  * mos7840_get_reg_sync
 275  *      To set the Uart register by calling usb_fill_control_urb function by
 276  *      passing usb_rcvctrlpipe function as parameter.
 277  */
 278
 279 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 280                                 __u16 *val)
 281 {
 282         struct usb_device *dev = port->serial->dev;
 283         int ret = 0;
 284         u8 *buf;
 285
 286         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 287         if (!buf)
 288                 return -ENOMEM;
 289
 290         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 291                               MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
 292                               MOS_WDR_TIMEOUT);
 293         *val = buf[0];
 294         dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
 295
 296         kfree(buf);
 297         return ret;
 298 }
 299
 300 /*
 301  * mos7840_set_uart_reg
 302  *      To set the Uart register by calling usb_fill_control_urb function by
 303  *      passing usb_sndctrlpipe function as parameter.
 304  */
 305
 306 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 307                                 __u16 val)
 308 {
 309
 310         struct usb_device *dev = port->serial->dev;
 311         val = val & 0x00ff;
 312         /* For the UART control registers, the application number need
 313            to be Or'ed */
 314         if (port->serial->num_ports == 4) {
 315                 val |= (((__u16) port->number -
 316                                 (__u16) (port->serial->minor)) + 1) << 8;
 317         } else {
 318                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 319                         val |= (((__u16) port->number -
 320                               (__u16) (port->serial->minor)) + 1) << 8;
 321                 } else {
 322                         val |= (((__u16) port->number -
 323                               (__u16) (port->serial->minor)) + 2) << 8;
 324                 }
 325         }
 326         dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
 327         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 328                                MCS_WR_RTYPE, val, reg, NULL, 0,
 329                                MOS_WDR_TIMEOUT);
 330
 331 }
 332
 333 /*
 334  * mos7840_get_uart_reg
 335  *      To set the Control register by calling usb_fill_control_urb function
 336  *      by passing usb_rcvctrlpipe function as parameter.
 337  */
 338 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 339                                 __u16 *val)
 340 {
 341         struct usb_device *dev = port->serial->dev;
 342         int ret = 0;
 343         __u16 Wval;
 344         u8 *buf;
 345
 346         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 347         if (!buf)
 348                 return -ENOMEM;
 349
 350         /* Wval  is same as application number */
 351         if (port->serial->num_ports == 4) {
 352                 Wval =
 353                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 354                      1) << 8;
 355         } else {
 356                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 357                         Wval = (((__u16) port->number -
 358                               (__u16) (port->serial->minor)) + 1) << 8;
 359                 } else {
 360                         Wval = (((__u16) port->number -
 361                               (__u16) (port->serial->minor)) + 2) << 8;
 362                 }
 363         }
 364         dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
 365         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 366                               MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
 367                               MOS_WDR_TIMEOUT);
 368         *val = buf[0];
 369
 370         kfree(buf);
 371         return ret;
 372 }
 373
 374 static void mos7840_dump_serial_port(struct usb_serial_port *port,
 375                                      struct moschip_port *mos7840_port)
 376 {
 377
 378         dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
 379         dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
 380         dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
 381
 382 }
 383
 384 /************************************************************************/
 385 /************************************************************************/
 386 /*             I N T E R F A C E   F U N C T I O N S                    */
 387 /*             I N T E R F A C E   F U N C T I O N S                    */
 388 /************************************************************************/
 389 /************************************************************************/
 390
 391 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 392                                             struct moschip_port *data)
 393 {
 394         usb_set_serial_port_data(port, (void *)data);
 395 }
 396
 397 static inline struct moschip_port *mos7840_get_port_private(struct
 398                                                             usb_serial_port
 399                                                             *port)
 400 {
 401         return (struct moschip_port *)usb_get_serial_port_data(port);
 402 }
 403
 404 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 405 {
 406         struct moschip_port *mos7840_port;
 407         struct async_icount *icount;
 408         mos7840_port = port;
 409         icount = &mos7840_port->icount;
 410         if (new_msr &
 411             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 412              MOS_MSR_DELTA_CD)) {
 413                 icount = &mos7840_port->icount;
 414
 415                 /* update input line counters */
 416                 if (new_msr & MOS_MSR_DELTA_CTS) {
 417                         icount->cts++;
 418                         smp_wmb();
 419                 }
 420                 if (new_msr & MOS_MSR_DELTA_DSR) {
 421                         icount->dsr++;
 422                         smp_wmb();
 423                 }
 424                 if (new_msr & MOS_MSR_DELTA_CD) {
 425                         icount->dcd++;
 426                         smp_wmb();
 427                 }
 428                 if (new_msr & MOS_MSR_DELTA_RI) {
 429                         icount->rng++;
 430                         smp_wmb();
 431                 }
 432         }
 433 }
 434
 435 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 436 {
 437         struct async_icount *icount;
 438
 439         if (new_lsr & SERIAL_LSR_BI) {
 440                 /*
 441                  * Parity and Framing errors only count if they
 442                  * occur exclusive of a break being
 443                  * received.
 444                  */
 445                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 446         }
 447
 448         /* update input line counters */
 449         icount = &port->icount;
 450         if (new_lsr & SERIAL_LSR_BI) {
 451                 icount->brk++;
 452                 smp_wmb();
 453         }
 454         if (new_lsr & SERIAL_LSR_OE) {
 455                 icount->overrun++;
 456                 smp_wmb();
 457         }
 458         if (new_lsr & SERIAL_LSR_PE) {
 459                 icount->parity++;
 460                 smp_wmb();
 461         }
 462         if (new_lsr & SERIAL_LSR_FE) {
 463                 icount->frame++;
 464                 smp_wmb();
 465         }
 466 }
 467
 468 /************************************************************************/
 469 /************************************************************************/
 470 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 471 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 472 /************************************************************************/
 473 /************************************************************************/
 474
 475 static void mos7840_control_callback(struct urb *urb)
 476 {
 477         unsigned char *data;
 478         struct moschip_port *mos7840_port;
 479         struct device *dev = &urb->dev->dev;
 480         __u8 regval = 0x0;
 481         int result = 0;
 482         int status = urb->status;
 483
 484         mos7840_port = urb->context;
 485
 486         switch (status) {
 487         case 0:
 488                 /* success */
 489                 break;
 490         case -ECONNRESET:
 491         case -ENOENT:
 492         case -ESHUTDOWN:
 493                 /* this urb is terminated, clean up */
 494                 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
 495                 return;
 496         default:
 497                 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
 498                 goto exit;
 499         }
 500
 501         dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length);
 502         dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__,
 503                 mos7840_port->MsrLsr, mos7840_port->port_num);
 504         data = urb->transfer_buffer;
 505         regval = (__u8) data[0];
 506         dev_dbg(dev, "%s data is %x\n", __func__, regval);
 507         if (mos7840_port->MsrLsr == 0)
 508                 mos7840_handle_new_msr(mos7840_port, regval);
 509         else if (mos7840_port->MsrLsr == 1)
 510                 mos7840_handle_new_lsr(mos7840_port, regval);
 511
 512 exit:
 513         spin_lock(&mos7840_port->pool_lock);
 514         if (!mos7840_port->zombie)
 515                 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
 516         spin_unlock(&mos7840_port->pool_lock);
 517         if (result) {
 518                 dev_err(dev, "%s - Error %d submitting interrupt urb\n",
 519                         __func__, result);
 520         }
 521 }
 522
 523 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 524                            __u16 *val)
 525 {
 526         struct usb_device *dev = mcs->port->serial->dev;
 527         struct usb_ctrlrequest *dr = mcs->dr;
 528         unsigned char *buffer = mcs->ctrl_buf;
 529         int ret;
 530
 531         dr->bRequestType = MCS_RD_RTYPE;
 532         dr->bRequest = MCS_RDREQ;
 533         dr->wValue = cpu_to_le16(Wval); /* 0 */
 534         dr->wIndex = cpu_to_le16(reg);
 535         dr->wLength = cpu_to_le16(2);
 536
 537         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 538                              (unsigned char *)dr, buffer, 2,
 539                              mos7840_control_callback, mcs);
 540         mcs->control_urb->transfer_buffer_length = 2;
 541         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 542         return ret;
 543 }
 544
 545 static void mos7840_set_led_callback(struct urb *urb)
 546 {
 547         switch (urb->status) {
 548         case 0:
 549                 /* Success */
 550                 break;
 551         case -ECONNRESET:
 552         case -ENOENT:
 553         case -ESHUTDOWN:
 554                 /* This urb is terminated, clean up */
 555                 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d",
 556                         __func__, urb->status);
 557                 break;
 558         default:
 559                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d",
 560                         __func__, urb->status);
 561         }
 562 }
 563
 564 static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
 565                                 __u16 reg)
 566 {
 567         struct usb_device *dev = mcs->port->serial->dev;
 568         struct usb_ctrlrequest *dr = mcs->dr;
 569
 570         dr->bRequestType = MCS_WR_RTYPE;
 571         dr->bRequest = MCS_WRREQ;
 572         dr->wValue = cpu_to_le16(wval);
 573         dr->wIndex = cpu_to_le16(reg);
 574         dr->wLength = cpu_to_le16(0);
 575
 576         usb_fill_control_urb(mcs->control_urb, dev, usb_sndctrlpipe(dev, 0),
 577                 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
 578
 579         usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 580 }
 581
 582 static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
 583                                 __u16 val)
 584 {
 585         struct usb_device *dev = port->serial->dev;
 586
 587         usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
 588                         val, reg, NULL, 0, MOS_WDR_TIMEOUT);
 589 }
 590
 591 static void mos7840_led_off(unsigned long arg)
 592 {
 593         struct moschip_port *mcs = (struct moschip_port *) arg;
 594
 595         /* Turn off LED */
 596         mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
 597         mod_timer(&mcs->led_timer2,
 598                                 jiffies + msecs_to_jiffies(LED_OFF_MS));
 599 }
 600
 601 static void mos7840_led_flag_off(unsigned long arg)
 602 {
 603         struct moschip_port *mcs = (struct moschip_port *) arg;
 604
 605         mcs->led_flag = false;
 606 }
 607
 608 /*****************************************************************************
 609  * mos7840_interrupt_callback
 610  *      this is the callback function for when we have received data on the
 611  *      interrupt endpoint.
 612  *****************************************************************************/
 613
 614 static void mos7840_interrupt_callback(struct urb *urb)
 615 {
 616         int result;
 617         int length;
 618         struct moschip_port *mos7840_port;
 619         struct usb_serial *serial;
 620         __u16 Data;
 621         unsigned char *data;
 622         __u8 sp[5], st;
 623         int i, rv = 0;
 624         __u16 wval, wreg = 0;
 625         int status = urb->status;
 626
 627         switch (status) {
 628         case 0:
 629                 /* success */
 630                 break;
 631         case -ECONNRESET:
 632         case -ENOENT:
 633         case -ESHUTDOWN:
 634                 /* this urb is terminated, clean up */
 635                 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
 636                         __func__, status);
 637                 return;
 638         default:
 639                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
 640                         __func__, status);
 641                 goto exit;
 642         }
 643
 644         length = urb->actual_length;
 645         data = urb->transfer_buffer;
 646
 647         serial = urb->context;
 648
 649         /* Moschip get 5 bytes
 650          * Byte 1 IIR Port 1 (port.number is 0)
 651          * Byte 2 IIR Port 2 (port.number is 1)
 652          * Byte 3 IIR Port 3 (port.number is 2)
 653          * Byte 4 IIR Port 4 (port.number is 3)
 654          * Byte 5 FIFO status for both */
 655
 656         if (length && length > 5) {
 657                 dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n");
 658                 return;
 659         }
 660
 661         sp[0] = (__u8) data[0];
 662         sp[1] = (__u8) data[1];
 663         sp[2] = (__u8) data[2];
 664         sp[3] = (__u8) data[3];
 665         st = (__u8) data[4];
 666
 667         for (i = 0; i < serial->num_ports; i++) {
 668                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 669                 wval =
 670                     (((__u16) serial->port[i]->number -
 671                       (__u16) (serial->minor)) + 1) << 8;
 672                 if (mos7840_port->open) {
 673                         if (sp[i] & 0x01) {
 674                                 dev_dbg(&urb->dev->dev, "SP%d No Interrupt !!!\n", i);
 675                         } else {
 676                                 switch (sp[i] & 0x0f) {
 677                                 case SERIAL_IIR_RLS:
 678                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Receiver status error or \n", i);
 679                                         dev_dbg(&urb->dev->dev, "address bit detected in 9-bit mode\n");
 680                                         mos7840_port->MsrLsr = 1;
 681                                         wreg = LINE_STATUS_REGISTER;
 682                                         break;
 683                                 case SERIAL_IIR_MS:
 684                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Modem status change\n", i);
 685                                         mos7840_port->MsrLsr = 0;
 686                                         wreg = MODEM_STATUS_REGISTER;
 687                                         break;
 688                                 }
 689                                 spin_lock(&mos7840_port->pool_lock);
 690                                 if (!mos7840_port->zombie) {
 691                                         rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 692                                 } else {
 693                                         spin_unlock(&mos7840_port->pool_lock);
 694                                         return;
 695                                 }
 696                                 spin_unlock(&mos7840_port->pool_lock);
 697                         }
 698                 }
 699         }
 700         if (!(rv < 0))
 701                 /* the completion handler for the control urb will resubmit */
 702                 return;
 703 exit:
 704         result = usb_submit_urb(urb, GFP_ATOMIC);
 705         if (result) {
 706                 dev_err(&urb->dev->dev,
 707                         "%s - Error %d submitting interrupt urb\n",
 708                         __func__, result);
 709         }
 710 }
 711
 712 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 713                                        const char *function)
 714 {
 715         if (!port) {
 716                 pr_debug("%s - port == NULL\n", function);
 717                 return -1;
 718         }
 719         if (!port->serial) {
 720                 pr_debug("%s - port->serial == NULL\n", function);
 721                 return -1;
 722         }
 723
 724         return 0;
 725 }
 726
 727 /* Inline functions to check the sanity of a pointer that is passed to us */
 728 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 729                                          const char *function)
 730 {
 731         if (!serial) {
 732                 pr_debug("%s - serial == NULL\n", function);
 733                 return -1;
 734         }
 735         if (!serial->type) {
 736                 pr_debug("%s - serial->type == NULL!\n", function);
 737                 return -1;
 738         }
 739
 740         return 0;
 741 }
 742
 743 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 744                                                  const char *function)
 745 {
 746         /* if no port was specified, or it fails a paranoia check */
 747         if (!port ||
 748             mos7840_port_paranoia_check(port, function) ||
 749             mos7840_serial_paranoia_check(port->serial, function)) {
 750                 /* then say that we don't have a valid usb_serial thing,
 751                  * which will end up genrating -ENODEV return values */
 752                 return NULL;
 753         }
 754
 755         return port->serial;
 756 }
 757
 758 /*****************************************************************************
 759  * mos7840_bulk_in_callback
 760  *      this is the callback function for when we have received data on the
 761  *      bulk in endpoint.
 762  *****************************************************************************/
 763
 764 static void mos7840_bulk_in_callback(struct urb *urb)
 765 {
 766         int retval;
 767         unsigned char *data;
 768         struct usb_serial *serial;
 769         struct usb_serial_port *port;
 770         struct moschip_port *mos7840_port;
 771         struct tty_struct *tty;
 772         int status = urb->status;
 773
 774         mos7840_port = urb->context;
 775         if (!mos7840_port)
 776                 return;
 777
 778         if (status) {
 779                 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
 780                 mos7840_port->read_urb_busy = false;
 781                 return;
 782         }
 783
 784         port = mos7840_port->port;
 785         if (mos7840_port_paranoia_check(port, __func__)) {
 786                 mos7840_port->read_urb_busy = false;
 787                 return;
 788         }
 789
 790         serial = mos7840_get_usb_serial(port, __func__);
 791         if (!serial) {
 792                 mos7840_port->read_urb_busy = false;
 793                 return;
 794         }
 795
 796         data = urb->transfer_buffer;
 797         usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
 798
 799         if (urb->actual_length) {
 800                 tty = tty_port_tty_get(&mos7840_port->port->port);
 801                 if (tty) {
 802                         tty_insert_flip_string(tty, data, urb->actual_length);
 803                         tty_flip_buffer_push(tty);
 804                         tty_kref_put(tty);
 805                 }
 806                 mos7840_port->icount.rx += urb->actual_length;
 807                 smp_wmb();
 808                 dev_dbg(&port->dev, "mos7840_port->icount.rx is %d:\n", mos7840_port->icount.rx);
 809         }
 810
 811         if (!mos7840_port->read_urb) {
 812                 dev_dbg(&port->dev, "%s", "URB KILLED !!!\n");
 813                 mos7840_port->read_urb_busy = false;
 814                 return;
 815         }
 816
 817         /* Turn on LED */
 818         if (mos7840_port->has_led && !mos7840_port->led_flag) {
 819                 mos7840_port->led_flag = true;
 820                 mos7840_set_led_async(mos7840_port, 0x0301,
 821                                         MODEM_CONTROL_REGISTER);
 822                 mod_timer(&mos7840_port->led_timer1,
 823                                 jiffies + msecs_to_jiffies(LED_ON_MS));
 824         }
 825
 826         mos7840_port->read_urb_busy = true;
 827         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 828
 829         if (retval) {
 830                 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
 831                 mos7840_port->read_urb_busy = false;
 832         }
 833 }
 834
 835 /*****************************************************************************
 836  * mos7840_bulk_out_data_callback
 837  *      this is the callback function for when we have finished sending
 838  *      serial data on the bulk out endpoint.
 839  *****************************************************************************/
 840
 841 static void mos7840_bulk_out_data_callback(struct urb *urb)
 842 {
 843         struct moschip_port *mos7840_port;
 844         struct usb_serial_port *port;
 845         struct tty_struct *tty;
 846         int status = urb->status;
 847         int i;
 848
 849         mos7840_port = urb->context;
 850         port = mos7840_port->port;
 851         spin_lock(&mos7840_port->pool_lock);
 852         for (i = 0; i < NUM_URBS; i++) {
 853                 if (urb == mos7840_port->write_urb_pool[i]) {
 854                         mos7840_port->busy[i] = 0;
 855                         break;
 856                 }
 857         }
 858         spin_unlock(&mos7840_port->pool_lock);
 859
 860         if (status) {
 861                 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
 862                 return;
 863         }
 864
 865         if (mos7840_port_paranoia_check(port, __func__))
 866                 return;
 867
 868         tty = tty_port_tty_get(&port->port);
 869         if (tty && mos7840_port->open)
 870                 tty_wakeup(tty);
 871         tty_kref_put(tty);
 872
 873 }
 874
 875 /************************************************************************/
 876 /*       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       */
 877 /************************************************************************/
 878 #ifdef MCSSerialProbe
 879 static int mos7840_serial_probe(struct usb_serial *serial,
 880                                 const struct usb_device_id *id)
 881 {
 882
 883         /*need to implement the mode_reg reading and updating\
 884            structures usb_serial_ device_type\
 885            (i.e num_ports, num_bulkin,bulkout etc) */
 886         /* Also we can update the changes  attach */
 887         return 1;
 888 }
 889 #endif
 890
 891 /*****************************************************************************
 892  * mos7840_open
 893  *      this function is called by the tty driver when a port is opened
 894  *      If successful, we return 0
 895  *      Otherwise we return a negative error number.
 896  *****************************************************************************/
 897
 898 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
 899 {
 900         int response;
 901         int j;
 902         struct usb_serial *serial;
 903         struct urb *urb;
 904         __u16 Data;
 905         int status;
 906         struct moschip_port *mos7840_port;
 907         struct moschip_port *port0;
 908
 909         if (mos7840_port_paranoia_check(port, __func__))
 910                 return -ENODEV;
 911
 912         serial = port->serial;
 913
 914         if (mos7840_serial_paranoia_check(serial, __func__))
 915                 return -ENODEV;
 916
 917         mos7840_port = mos7840_get_port_private(port);
 918         port0 = mos7840_get_port_private(serial->port[0]);
 919
 920         if (mos7840_port == NULL || port0 == NULL)
 921                 return -ENODEV;
 922
 923         usb_clear_halt(serial->dev, port->write_urb->pipe);
 924         usb_clear_halt(serial->dev, port->read_urb->pipe);
 925         port0->open_ports++;
 926
 927         /* Initialising the write urb pool */
 928         for (j = 0; j < NUM_URBS; ++j) {
 929                 urb = usb_alloc_urb(0, GFP_KERNEL);
 930                 mos7840_port->write_urb_pool[j] = urb;
 931
 932                 if (urb == NULL) {
 933                         dev_err(&port->dev, "No more urbs???\n");
 934                         continue;
 935                 }
 936
 937                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 938                                                                 GFP_KERNEL);
 939                 if (!urb->transfer_buffer) {
 940                         usb_free_urb(urb);
 941                         mos7840_port->write_urb_pool[j] = NULL;
 942                         dev_err(&port->dev,
 943                                 "%s-out of memory for urb buffers.\n",
 944                                 __func__);
 945                         continue;
 946                 }
 947         }
 948
 949 /*****************************************************************************
 950  * Initialize MCS7840 -- Write Init values to corresponding Registers
 951  *
 952  * Register Index
 953  * 1 : IER
 954  * 2 : FCR
 955  * 3 : LCR
 956  * 4 : MCR
 957  *
 958  * 0x08 : SP1/2 Control Reg
 959  *****************************************************************************/
 960
 961         /* NEED to check the following Block */
 962
 963         Data = 0x0;
 964         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 965         if (status < 0) {
 966                 dev_dbg(&port->dev, "Reading Spreg failed\n");
 967                 return -1;
 968         }
 969         Data |= 0x80;
 970         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 971         if (status < 0) {
 972                 dev_dbg(&port->dev, "writing Spreg failed\n");
 973                 return -1;
 974         }
 975
 976         Data &= ~0x80;
 977         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 978         if (status < 0) {
 979                 dev_dbg(&port->dev, "writing Spreg failed\n");
 980                 return -1;
 981         }
 982         /* End of block to be checked */
 983
 984         Data = 0x0;
 985         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 986                                                                         &Data);
 987         if (status < 0) {
 988                 dev_dbg(&port->dev, "Reading Controlreg failed\n");
 989                 return -1;
 990         }
 991         Data |= 0x08;           /* Driver done bit */
 992         Data |= 0x20;           /* rx_disable */
 993         status = mos7840_set_reg_sync(port,
 994                                 mos7840_port->ControlRegOffset, Data);
 995         if (status < 0) {
 996                 dev_dbg(&port->dev, "writing Controlreg failed\n");
 997                 return -1;
 998         }
 999         /* do register settings here */
1000         /* Set all regs to the device default values. */
1001         /***********************************
1002          * First Disable all interrupts.
1003          ***********************************/
1004         Data = 0x00;
1005         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1006         if (status < 0) {
1007                 dev_dbg(&port->dev, "disabling interrupts failed\n");
1008                 return -1;
1009         }
1010         /* Set FIFO_CONTROL_REGISTER to the default value */
1011         Data = 0x00;
1012         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1013         if (status < 0) {
1014                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
1015                 return -1;
1016         }
1017
1018         Data = 0xcf;
1019         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1020         if (status < 0) {
1021                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
1022                 return -1;
1023         }
1024
1025         Data = 0x03;
1026         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1027         mos7840_port->shadowLCR = Data;
1028
1029         Data = 0x0b;
1030         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1031         mos7840_port->shadowMCR = Data;
1032
1033         Data = 0x00;
1034         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1035         mos7840_port->shadowLCR = Data;
1036
1037         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1038         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1039
1040         Data = 0x0c;
1041         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1042
1043         Data = 0x0;
1044         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1045
1046         Data = 0x00;
1047         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1048
1049         Data = Data & ~SERIAL_LCR_DLAB;
1050         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1051         mos7840_port->shadowLCR = Data;
1052
1053         /* clearing Bulkin and Bulkout Fifo */
1054         Data = 0x0;
1055         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1056
1057         Data = Data | 0x0c;
1058         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1059
1060         Data = Data & ~0x0c;
1061         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1062         /* Finally enable all interrupts */
1063         Data = 0x0c;
1064         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1065
1066         /* clearing rx_disable */
1067         Data = 0x0;
1068         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1069                                                                         &Data);
1070         Data = Data & ~0x20;
1071         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1072                                                                         Data);
1073
1074         /* rx_negate */
1075         Data = 0x0;
1076         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1077                                                                         &Data);
1078         Data = Data | 0x10;
1079         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1080                                                                         Data);
1081
1082         /* Check to see if we've set up our endpoint info yet    *
1083          * (can't set it up in mos7840_startup as the structures *
1084          * were not set up at that time.)                        */
1085         if (port0->open_ports == 1) {
1086                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1087                         /* set up interrupt urb */
1088                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1089                                 serial->dev,
1090                                 usb_rcvintpipe(serial->dev,
1091                                 serial->port[0]->interrupt_in_endpointAddress),
1092                                 serial->port[0]->interrupt_in_buffer,
1093                                 serial->port[0]->interrupt_in_urb->
1094                                 transfer_buffer_length,
1095                                 mos7840_interrupt_callback,
1096                                 serial,
1097                                 serial->port[0]->interrupt_in_urb->interval);
1098
1099                         /* start interrupt read for mos7840               *
1100                          * will continue as long as mos7840 is connected  */
1101
1102                         response =
1103                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1104                                            GFP_KERNEL);
1105                         if (response) {
1106                                 dev_err(&port->dev, "%s - Error %d submitting "
1107                                         "interrupt urb\n", __func__, response);
1108                         }
1109
1110                 }
1111
1112         }
1113
1114         /* see if we've set up our endpoint info yet   *
1115          * (can't set it up in mos7840_startup as the  *
1116          * structures were not set up at that time.)   */
1117
1118         dev_dbg(&port->dev, "port number is %d\n", port->number);
1119         dev_dbg(&port->dev, "serial number is %d\n", port->serial->minor);
1120         dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
1121         dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
1122         dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
1123         dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
1124         mos7840_port->read_urb = port->read_urb;
1125
1126         /* set up our bulk in urb */
1127         if ((serial->num_ports == 2)
1128                 && ((((__u16)port->number -
1129                         (__u16)(port->serial->minor)) % 2) != 0)) {
1130                 usb_fill_bulk_urb(mos7840_port->read_urb,
1131                         serial->dev,
1132                         usb_rcvbulkpipe(serial->dev,
1133                                 (port->bulk_in_endpointAddress) + 2),
1134                         port->bulk_in_buffer,
1135                         mos7840_port->read_urb->transfer_buffer_length,
1136                         mos7840_bulk_in_callback, mos7840_port);
1137         } else {
1138                 usb_fill_bulk_urb(mos7840_port->read_urb,
1139                         serial->dev,
1140                         usb_rcvbulkpipe(serial->dev,
1141                                 port->bulk_in_endpointAddress),
1142                         port->bulk_in_buffer,
1143                         mos7840_port->read_urb->transfer_buffer_length,
1144                         mos7840_bulk_in_callback, mos7840_port);
1145         }
1146
1147         dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
1148         mos7840_port->read_urb_busy = true;
1149         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1150         if (response) {
1151                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1152                         __func__, response);
1153                 mos7840_port->read_urb_busy = false;
1154         }
1155
1156         /* initialize our wait queues */
1157         init_waitqueue_head(&mos7840_port->wait_chase);
1158         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1159
1160         /* initialize our icount structure */
1161         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1162
1163         /* initialize our port settings */
1164         /* Must set to enable ints! */
1165         mos7840_port->shadowMCR = MCR_MASTER_IE;
1166         /* send a open port command */
1167         mos7840_port->open = 1;
1168         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1169         mos7840_port->icount.tx = 0;
1170         mos7840_port->icount.rx = 0;
1171
1172         return 0;
1173 }
1174
1175 /*****************************************************************************
1176  * mos7840_chars_in_buffer
1177  *      this function is called by the tty driver when it wants to know how many
1178  *      bytes of data we currently have outstanding in the port (data that has
1179  *      been written, but hasn't made it out the port yet)
1180  *      If successful, we return the number of bytes left to be written in the
1181  *      system,
1182  *      Otherwise we return zero.
1183  *****************************************************************************/
1184
1185 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1186 {
1187         struct usb_serial_port *port = tty->driver_data;
1188         int i;
1189         int chars = 0;
1190         unsigned long flags;
1191         struct moschip_port *mos7840_port;
1192
1193         if (mos7840_port_paranoia_check(port, __func__))
1194                 return 0;
1195
1196         mos7840_port = mos7840_get_port_private(port);
1197         if (mos7840_port == NULL)
1198                 return 0;
1199
1200         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1201         for (i = 0; i < NUM_URBS; ++i) {
1202                 if (mos7840_port->busy[i]) {
1203                         struct urb *urb = mos7840_port->write_urb_pool[i];
1204                         chars += urb->transfer_buffer_length;
1205                 }
1206         }
1207         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1208         dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1209         return chars;
1210
1211 }
1212
1213 /*****************************************************************************
1214  * mos7840_close
1215  *      this function is called by the tty driver when a port is closed
1216  *****************************************************************************/
1217
1218 static void mos7840_close(struct usb_serial_port *port)
1219 {
1220         struct usb_serial *serial;
1221         struct moschip_port *mos7840_port;
1222         struct moschip_port *port0;
1223         int j;
1224         __u16 Data;
1225
1226         if (mos7840_port_paranoia_check(port, __func__))
1227                 return;
1228
1229         serial = mos7840_get_usb_serial(port, __func__);
1230         if (!serial)
1231                 return;
1232
1233         mos7840_port = mos7840_get_port_private(port);
1234         port0 = mos7840_get_port_private(serial->port[0]);
1235
1236         if (mos7840_port == NULL || port0 == NULL)
1237                 return;
1238
1239         for (j = 0; j < NUM_URBS; ++j)
1240                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1241
1242         /* Freeing Write URBs */
1243         for (j = 0; j < NUM_URBS; ++j) {
1244                 if (mos7840_port->write_urb_pool[j]) {
1245                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1246                                 kfree(mos7840_port->write_urb_pool[j]->
1247                                       transfer_buffer);
1248
1249                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1250                 }
1251         }
1252
1253         /* While closing port, shutdown all bulk read, write  *
1254          * and interrupt read if they exists                  */
1255         if (serial->dev) {
1256                 if (mos7840_port->write_urb) {
1257                         dev_dbg(&port->dev, "%s", "Shutdown bulk write\n");
1258                         usb_kill_urb(mos7840_port->write_urb);
1259                 }
1260                 if (mos7840_port->read_urb) {
1261                         dev_dbg(&port->dev, "%s", "Shutdown bulk read\n");
1262                         usb_kill_urb(mos7840_port->read_urb);
1263                         mos7840_port->read_urb_busy = false;
1264                 }
1265                 if ((&mos7840_port->control_urb)) {
1266                         dev_dbg(&port->dev, "%s", "Shutdown control read\n");
1267                         /*/      usb_kill_urb (mos7840_port->control_urb); */
1268                 }
1269         }
1270 /*      if(mos7840_port->ctrl_buf != NULL) */
1271 /*              kfree(mos7840_port->ctrl_buf); */
1272         port0->open_ports--;
1273         dev_dbg(&port->dev, "%s in close%d:in port%d\n", __func__, port0->open_ports, port->number);
1274         if (port0->open_ports == 0) {
1275                 if (serial->port[0]->interrupt_in_urb) {
1276                         dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n");
1277                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1278                 }
1279         }
1280
1281         if (mos7840_port->write_urb) {
1282                 /* if this urb had a transfer buffer already (old tx) free it */
1283                 if (mos7840_port->write_urb->transfer_buffer != NULL)
1284                         kfree(mos7840_port->write_urb->transfer_buffer);
1285                 usb_free_urb(mos7840_port->write_urb);
1286         }
1287
1288         Data = 0x0;
1289         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1290
1291         Data = 0x00;
1292         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1293
1294         mos7840_port->open = 0;
1295 }
1296
1297 /************************************************************************
1298  *
1299  * mos7840_block_until_chase_response
1300  *
1301  *      This function will block the close until one of the following:
1302  *              1. Response to our Chase comes from mos7840
1303  *              2. A timeout of 10 seconds without activity has expired
1304  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1305  *
1306  ************************************************************************/
1307
1308 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1309                                         struct moschip_port *mos7840_port)
1310 {
1311         int timeout = msecs_to_jiffies(1000);
1312         int wait = 10;
1313         int count;
1314
1315         while (1) {
1316                 count = mos7840_chars_in_buffer(tty);
1317
1318                 /* Check for Buffer status */
1319                 if (count <= 0)
1320                         return;
1321
1322                 /* Block the thread for a while */
1323                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1324                                                timeout);
1325                 /* No activity.. count down section */
1326                 wait--;
1327                 if (wait == 0) {
1328                         dev_dbg(&mos7840_port->port->dev, "%s - TIMEOUT\n", __func__);
1329                         return;
1330                 } else {
1331                         /* Reset timeout value back to seconds */
1332                         wait = 10;
1333                 }
1334         }
1335
1336 }
1337
1338 /*****************************************************************************
1339  * mos7840_break
1340  *      this function sends a break to the port
1341  *****************************************************************************/
1342 static void mos7840_break(struct tty_struct *tty, int break_state)
1343 {
1344         struct usb_serial_port *port = tty->driver_data;
1345         unsigned char data;
1346         struct usb_serial *serial;
1347         struct moschip_port *mos7840_port;
1348
1349         if (mos7840_port_paranoia_check(port, __func__))
1350                 return;
1351
1352         serial = mos7840_get_usb_serial(port, __func__);
1353         if (!serial)
1354                 return;
1355
1356         mos7840_port = mos7840_get_port_private(port);
1357
1358         if (mos7840_port == NULL)
1359                 return;
1360
1361         if (serial->dev)
1362                 /* flush and block until tx is empty */
1363                 mos7840_block_until_chase_response(tty, mos7840_port);
1364
1365         if (break_state == -1)
1366                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1367         else
1368                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1369
1370         /* FIXME: no locking on shadowLCR anywhere in driver */
1371         mos7840_port->shadowLCR = data;
1372         dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1373         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1374                              mos7840_port->shadowLCR);
1375 }
1376
1377 /*****************************************************************************
1378  * mos7840_write_room
1379  *      this function is called by the tty driver when it wants to know how many
1380  *      bytes of data we can accept for a specific port.
1381  *      If successful, we return the amount of room that we have for this port
1382  *      Otherwise we return a negative error number.
1383  *****************************************************************************/
1384
1385 static int mos7840_write_room(struct tty_struct *tty)
1386 {
1387         struct usb_serial_port *port = tty->driver_data;
1388         int i;
1389         int room = 0;
1390         unsigned long flags;
1391         struct moschip_port *mos7840_port;
1392
1393         if (mos7840_port_paranoia_check(port, __func__))
1394                 return -1;
1395
1396         mos7840_port = mos7840_get_port_private(port);
1397         if (mos7840_port == NULL)
1398                 return -1;
1399
1400         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1401         for (i = 0; i < NUM_URBS; ++i) {
1402                 if (!mos7840_port->busy[i])
1403                         room += URB_TRANSFER_BUFFER_SIZE;
1404         }
1405         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1406
1407         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1408         dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room);
1409         return room;
1410
1411 }
1412
1413 /*****************************************************************************
1414  * mos7840_write
1415  *      this function is called by the tty driver when data should be written to
1416  *      the port.
1417  *      If successful, we return the number of bytes written, otherwise we
1418  *      return a negative error number.
1419  *****************************************************************************/
1420
1421 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1422                          const unsigned char *data, int count)
1423 {
1424         int status;
1425         int i;
1426         int bytes_sent = 0;
1427         int transfer_size;
1428         unsigned long flags;
1429
1430         struct moschip_port *mos7840_port;
1431         struct usb_serial *serial;
1432         struct urb *urb;
1433         /* __u16 Data; */
1434         const unsigned char *current_position = data;
1435         unsigned char *data1;
1436
1437 #ifdef NOTMOS7840
1438         Data = 0x00;
1439         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1440         mos7840_port->shadowLCR = Data;
1441         dev_dbg(&port->dev, "%s: LINE_CONTROL_REGISTER is %x\n", __func__, Data);
1442         dev_dbg(&port->dev, "%s: mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1443
1444         /* Data = 0x03; */
1445         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1446         /* mos7840_port->shadowLCR=Data;//Need to add later */
1447
1448         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1449         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1450
1451         /* Data = 0x0c; */
1452         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1453         Data = 0x00;
1454         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1455         dev_dbg(&port->dev, "%s: DLL value is %x\n", __func__, Data);
1456
1457         Data = 0x0;
1458         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1459         dev_dbg(&port->dev, "%s: DLM value is %x\n", __func__, Data);
1460
1461         Data = Data & ~SERIAL_LCR_DLAB;
1462         dev_dbg(&port->dev, "%s: mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1463         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1464 #endif
1465
1466         if (mos7840_port_paranoia_check(port, __func__))
1467                 return -1;
1468
1469         serial = port->serial;
1470         if (mos7840_serial_paranoia_check(serial, __func__))
1471                 return -1;
1472
1473         mos7840_port = mos7840_get_port_private(port);
1474         if (mos7840_port == NULL)
1475                 return -1;
1476
1477         /* try to find a free urb in the list */
1478         urb = NULL;
1479
1480         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1481         for (i = 0; i < NUM_URBS; ++i) {
1482                 if (!mos7840_port->busy[i]) {
1483                         mos7840_port->busy[i] = 1;
1484                         urb = mos7840_port->write_urb_pool[i];
1485                         dev_dbg(&port->dev, "URB:%d\n", i);
1486                         break;
1487                 }
1488         }
1489         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1490
1491         if (urb == NULL) {
1492                 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1493                 goto exit;
1494         }
1495
1496         if (urb->transfer_buffer == NULL) {
1497                 urb->transfer_buffer =
1498                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1499
1500                 if (urb->transfer_buffer == NULL) {
1501                         dev_err_console(port, "%s no more kernel memory...\n",
1502                                 __func__);
1503                         goto exit;
1504                 }
1505         }
1506         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1507
1508         memcpy(urb->transfer_buffer, current_position, transfer_size);
1509
1510         /* fill urb with data and submit  */
1511         if ((serial->num_ports == 2)
1512                 && ((((__u16)port->number -
1513                         (__u16)(port->serial->minor)) % 2) != 0)) {
1514                 usb_fill_bulk_urb(urb,
1515                         serial->dev,
1516                         usb_sndbulkpipe(serial->dev,
1517                                 (port->bulk_out_endpointAddress) + 2),
1518                         urb->transfer_buffer,
1519                         transfer_size,
1520                         mos7840_bulk_out_data_callback, mos7840_port);
1521         } else {
1522                 usb_fill_bulk_urb(urb,
1523                         serial->dev,
1524                         usb_sndbulkpipe(serial->dev,
1525                                 port->bulk_out_endpointAddress),
1526                         urb->transfer_buffer,
1527                         transfer_size,
1528                         mos7840_bulk_out_data_callback, mos7840_port);
1529         }
1530
1531         data1 = urb->transfer_buffer;
1532         dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
1533
1534         /* Turn on LED */
1535         if (mos7840_port->has_led && !mos7840_port->led_flag) {
1536                 mos7840_port->led_flag = true;
1537                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0301);
1538                 mod_timer(&mos7840_port->led_timer1,
1539                                 jiffies + msecs_to_jiffies(LED_ON_MS));
1540         }
1541
1542         /* send it down the pipe */
1543         status = usb_submit_urb(urb, GFP_ATOMIC);
1544
1545         if (status) {
1546                 mos7840_port->busy[i] = 0;
1547                 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1548                         "with status = %d\n", __func__, status);
1549                 bytes_sent = status;
1550                 goto exit;
1551         }
1552         bytes_sent = transfer_size;
1553         mos7840_port->icount.tx += transfer_size;
1554         smp_wmb();
1555         dev_dbg(&port->dev, "mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx);
1556 exit:
1557         return bytes_sent;
1558
1559 }
1560
1561 /*****************************************************************************
1562  * mos7840_throttle
1563  *      this function is called by the tty driver when it wants to stop the data
1564  *      being read from the port.
1565  *****************************************************************************/
1566
1567 static void mos7840_throttle(struct tty_struct *tty)
1568 {
1569         struct usb_serial_port *port = tty->driver_data;
1570         struct moschip_port *mos7840_port;
1571         int status;
1572
1573         if (mos7840_port_paranoia_check(port, __func__))
1574                 return;
1575
1576         mos7840_port = mos7840_get_port_private(port);
1577
1578         if (mos7840_port == NULL)
1579                 return;
1580
1581         if (!mos7840_port->open) {
1582                 dev_dbg(&port->dev, "%s", "port not opened\n");
1583                 return;
1584         }
1585
1586         /* if we are implementing XON/XOFF, send the stop character */
1587         if (I_IXOFF(tty)) {
1588                 unsigned char stop_char = STOP_CHAR(tty);
1589                 status = mos7840_write(tty, port, &stop_char, 1);
1590                 if (status <= 0)
1591                         return;
1592         }
1593         /* if we are implementing RTS/CTS, toggle that line */
1594         if (tty->termios.c_cflag & CRTSCTS) {
1595                 mos7840_port->shadowMCR &= ~MCR_RTS;
1596                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1597                                          mos7840_port->shadowMCR);
1598                 if (status < 0)
1599                         return;
1600         }
1601 }
1602
1603 /*****************************************************************************
1604  * mos7840_unthrottle
1605  *      this function is called by the tty driver when it wants to resume
1606  *      the data being read from the port (called after mos7840_throttle is
1607  *      called)
1608  *****************************************************************************/
1609 static void mos7840_unthrottle(struct tty_struct *tty)
1610 {
1611         struct usb_serial_port *port = tty->driver_data;
1612         int status;
1613         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1614
1615         if (mos7840_port_paranoia_check(port, __func__))
1616                 return;
1617
1618         if (mos7840_port == NULL)
1619                 return;
1620
1621         if (!mos7840_port->open) {
1622                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1623                 return;
1624         }
1625
1626         /* if we are implementing XON/XOFF, send the start character */
1627         if (I_IXOFF(tty)) {
1628                 unsigned char start_char = START_CHAR(tty);
1629                 status = mos7840_write(tty, port, &start_char, 1);
1630                 if (status <= 0)
1631                         return;
1632         }
1633
1634         /* if we are implementing RTS/CTS, toggle that line */
1635         if (tty->termios.c_cflag & CRTSCTS) {
1636                 mos7840_port->shadowMCR |= MCR_RTS;
1637                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1638                                          mos7840_port->shadowMCR);
1639                 if (status < 0)
1640                         return;
1641         }
1642 }
1643
1644 static int mos7840_tiocmget(struct tty_struct *tty)
1645 {
1646         struct usb_serial_port *port = tty->driver_data;
1647         struct moschip_port *mos7840_port;
1648         unsigned int result;
1649         __u16 msr;
1650         __u16 mcr;
1651         int status;
1652         mos7840_port = mos7840_get_port_private(port);
1653
1654         if (mos7840_port == NULL)
1655                 return -ENODEV;
1656
1657         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1658         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1659         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1660             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1661             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1662             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1663             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1664             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1665             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1666
1667         dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1668
1669         return result;
1670 }
1671
1672 static int mos7840_tiocmset(struct tty_struct *tty,
1673                             unsigned int set, unsigned int clear)
1674 {
1675         struct usb_serial_port *port = tty->driver_data;
1676         struct moschip_port *mos7840_port;
1677         unsigned int mcr;
1678         int status;
1679
1680         mos7840_port = mos7840_get_port_private(port);
1681
1682         if (mos7840_port == NULL)
1683                 return -ENODEV;
1684
1685         /* FIXME: What locks the port registers ? */
1686         mcr = mos7840_port->shadowMCR;
1687         if (clear & TIOCM_RTS)
1688                 mcr &= ~MCR_RTS;
1689         if (clear & TIOCM_DTR)
1690                 mcr &= ~MCR_DTR;
1691         if (clear & TIOCM_LOOP)
1692                 mcr &= ~MCR_LOOPBACK;
1693
1694         if (set & TIOCM_RTS)
1695                 mcr |= MCR_RTS;
1696         if (set & TIOCM_DTR)
1697                 mcr |= MCR_DTR;
1698         if (set & TIOCM_LOOP)
1699                 mcr |= MCR_LOOPBACK;
1700
1701         mos7840_port->shadowMCR = mcr;
1702
1703         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1704         if (status < 0) {
1705                 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1706                 return status;
1707         }
1708
1709         return 0;
1710 }
1711
1712 /*****************************************************************************
1713  * mos7840_calc_baud_rate_divisor
1714  *      this function calculates the proper baud rate divisor for the specified
1715  *      baud rate.
1716  *****************************************************************************/
1717 static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1718                                           int baudRate, int *divisor,
1719                                           __u16 *clk_sel_val)
1720 {
1721         dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1722
1723         if (baudRate <= 115200) {
1724                 *divisor = 115200 / baudRate;
1725                 *clk_sel_val = 0x0;
1726         }
1727         if ((baudRate > 115200) && (baudRate <= 230400)) {
1728                 *divisor = 230400 / baudRate;
1729                 *clk_sel_val = 0x10;
1730         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1731                 *divisor = 403200 / baudRate;
1732                 *clk_sel_val = 0x20;
1733         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1734                 *divisor = 460800 / baudRate;
1735                 *clk_sel_val = 0x30;
1736         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1737                 *divisor = 806400 / baudRate;
1738                 *clk_sel_val = 0x40;
1739         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1740                 *divisor = 921600 / baudRate;
1741                 *clk_sel_val = 0x50;
1742         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1743                 *divisor = 1572864 / baudRate;
1744                 *clk_sel_val = 0x60;
1745         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1746                 *divisor = 3145728 / baudRate;
1747                 *clk_sel_val = 0x70;
1748         }
1749         return 0;
1750
1751 #ifdef NOTMCS7840
1752
1753         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1754                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1755                         *divisor = mos7840_divisor_table[i].Divisor;
1756                         return 0;
1757                 }
1758         }
1759
1760         /* After trying for all the standard baud rates    *
1761          * Try calculating the divisor for this baud rate  */
1762
1763         if (baudrate > 75 && baudrate < 230400) {
1764                 /* get the divisor */
1765                 custom = (__u16) (230400L / baudrate);
1766
1767                 /* Check for round off */
1768                 round1 = (__u16) (2304000L / baudrate);
1769                 round = (__u16) (round1 - (custom * 10));
1770                 if (round > 4)
1771                         custom++;
1772                 *divisor = custom;
1773
1774                 dev_dbg(&port->dev, " Baud %d = %d\n", baudrate, custom);
1775                 return 0;
1776         }
1777
1778         dev_dbg(&port->dev, "%s", " Baud calculation Failed...\n");
1779         return -1;
1780 #endif
1781 }
1782
1783 /*****************************************************************************
1784  * mos7840_send_cmd_write_baud_rate
1785  *      this function sends the proper command to change the baud rate of the
1786  *      specified port.
1787  *****************************************************************************/
1788
1789 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1790                                             int baudRate)
1791 {
1792         int divisor = 0;
1793         int status;
1794         __u16 Data;
1795         unsigned char number;
1796         __u16 clk_sel_val;
1797         struct usb_serial_port *port;
1798
1799         if (mos7840_port == NULL)
1800                 return -1;
1801
1802         port = mos7840_port->port;
1803         if (mos7840_port_paranoia_check(port, __func__))
1804                 return -1;
1805
1806         if (mos7840_serial_paranoia_check(port->serial, __func__))
1807                 return -1;
1808
1809         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1810
1811         dev_dbg(&port->dev, "%s - port = %d, baud = %d\n", __func__,
1812                 mos7840_port->port->number, baudRate);
1813         /* reset clk_uart_sel in spregOffset */
1814         if (baudRate > 115200) {
1815 #ifdef HW_flow_control
1816                 /* NOTE: need to see the pther register to modify */
1817                 /* setting h/w flow control bit to 1 */
1818                 Data = 0x2b;
1819                 mos7840_port->shadowMCR = Data;
1820                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1821                                                                         Data);
1822                 if (status < 0) {
1823                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1824                         return -1;
1825                 }
1826 #endif
1827
1828         } else {
1829 #ifdef HW_flow_control
1830                 /* setting h/w flow control bit to 0 */
1831                 Data = 0xb;
1832                 mos7840_port->shadowMCR = Data;
1833                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1834                                                                         Data);
1835                 if (status < 0) {
1836                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1837                         return -1;
1838                 }
1839 #endif
1840
1841         }
1842
1843         if (1) {                /* baudRate <= 115200) */
1844                 clk_sel_val = 0x0;
1845                 Data = 0x0;
1846                 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1847                                                    &clk_sel_val);
1848                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1849                                                                  &Data);
1850                 if (status < 0) {
1851                         dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1852                         return -1;
1853                 }
1854                 Data = (Data & 0x8f) | clk_sel_val;
1855                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1856                                                                 Data);
1857                 if (status < 0) {
1858                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1859                         return -1;
1860                 }
1861                 /* Calculate the Divisor */
1862
1863                 if (status) {
1864                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1865                         return status;
1866                 }
1867                 /* Enable access to divisor latch */
1868                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1869                 mos7840_port->shadowLCR = Data;
1870                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1871
1872                 /* Write the divisor */
1873                 Data = (unsigned char)(divisor & 0xff);
1874                 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1875                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1876
1877                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1878                 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1879                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1880
1881                 /* Disable access to divisor latch */
1882                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1883                 mos7840_port->shadowLCR = Data;
1884                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1885
1886         }
1887         return status;
1888 }
1889
1890 /*****************************************************************************
1891  * mos7840_change_port_settings
1892  *      This routine is called to set the UART on the device to match
1893  *      the specified new settings.
1894  *****************************************************************************/
1895
1896 static void mos7840_change_port_settings(struct tty_struct *tty,
1897         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1898 {
1899         int baud;
1900         unsigned cflag;
1901         unsigned iflag;
1902         __u8 lData;
1903         __u8 lParity;
1904         __u8 lStop;
1905         int status;
1906         __u16 Data;
1907         struct usb_serial_port *port;
1908         struct usb_serial *serial;
1909
1910         if (mos7840_port == NULL)
1911                 return;
1912
1913         port = mos7840_port->port;
1914
1915         if (mos7840_port_paranoia_check(port, __func__))
1916                 return;
1917
1918         if (mos7840_serial_paranoia_check(port->serial, __func__))
1919                 return;
1920
1921         serial = port->serial;
1922
1923         if (!mos7840_port->open) {
1924                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1925                 return;
1926         }
1927
1928         lData = LCR_BITS_8;
1929         lStop = LCR_STOP_1;
1930         lParity = LCR_PAR_NONE;
1931
1932         cflag = tty->termios.c_cflag;
1933         iflag = tty->termios.c_iflag;
1934
1935         /* Change the number of bits */
1936         if (cflag & CSIZE) {
1937                 switch (cflag & CSIZE) {
1938                 case CS5:
1939                         lData = LCR_BITS_5;
1940                         break;
1941
1942                 case CS6:
1943                         lData = LCR_BITS_6;
1944                         break;
1945
1946                 case CS7:
1947                         lData = LCR_BITS_7;
1948                         break;
1949                 default:
1950                 case CS8:
1951                         lData = LCR_BITS_8;
1952                         break;
1953                 }
1954         }
1955         /* Change the Parity bit */
1956         if (cflag & PARENB) {
1957                 if (cflag & PARODD) {
1958                         lParity = LCR_PAR_ODD;
1959                         dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1960                 } else {
1961                         lParity = LCR_PAR_EVEN;
1962                         dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1963                 }
1964
1965         } else {
1966                 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1967         }
1968
1969         if (cflag & CMSPAR)
1970                 lParity = lParity | 0x20;
1971
1972         /* Change the Stop bit */
1973         if (cflag & CSTOPB) {
1974                 lStop = LCR_STOP_2;
1975                 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1976         } else {
1977                 lStop = LCR_STOP_1;
1978                 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1979         }
1980
1981         /* Update the LCR with the correct value */
1982         mos7840_port->shadowLCR &=
1983             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1984         mos7840_port->shadowLCR |= (lData | lParity | lStop);
1985
1986         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1987                 mos7840_port->shadowLCR);
1988         /* Disable Interrupts */
1989         Data = 0x00;
1990         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1991
1992         Data = 0x00;
1993         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1994
1995         Data = 0xcf;
1996         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1997
1998         /* Send the updated LCR value to the mos7840 */
1999         Data = mos7840_port->shadowLCR;
2000
2001         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2002
2003         Data = 0x00b;
2004         mos7840_port->shadowMCR = Data;
2005         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2006         Data = 0x00b;
2007         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2008
2009         /* set up the MCR register and send it to the mos7840 */
2010
2011         mos7840_port->shadowMCR = MCR_MASTER_IE;
2012         if (cflag & CBAUD)
2013                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2014
2015         if (cflag & CRTSCTS)
2016                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2017         else
2018                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2019
2020         Data = mos7840_port->shadowMCR;
2021         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2022
2023         /* Determine divisor based on baud rate */
2024         baud = tty_get_baud_rate(tty);
2025
2026         if (!baud) {
2027                 /* pick a default, any default... */
2028                 dev_dbg(&port->dev, "%s", "Picked default baud...\n");
2029                 baud = 9600;
2030         }
2031
2032         dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
2033         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2034
2035         /* Enable Interrupts */
2036         Data = 0x0c;
2037         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2038
2039         if (mos7840_port->read_urb_busy == false) {
2040                 mos7840_port->read_urb_busy = true;
2041                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2042                 if (status) {
2043                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
2044                             status);
2045                         mos7840_port->read_urb_busy = false;
2046                 }
2047         }
2048         wake_up(&mos7840_port->delta_msr_wait);
2049         mos7840_port->delta_msr_cond = 1;
2050         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
2051                 mos7840_port->shadowLCR);
2052 }
2053
2054 /*****************************************************************************
2055  * mos7840_set_termios
2056  *      this function is called by the tty driver when it wants to change
2057  *      the termios structure
2058  *****************************************************************************/
2059
2060 static void mos7840_set_termios(struct tty_struct *tty,
2061                                 struct usb_serial_port *port,
2062                                 struct ktermios *old_termios)
2063 {
2064         int status;
2065         unsigned int cflag;
2066         struct usb_serial *serial;
2067         struct moschip_port *mos7840_port;
2068
2069         if (mos7840_port_paranoia_check(port, __func__))
2070                 return;
2071
2072         serial = port->serial;
2073
2074         if (mos7840_serial_paranoia_check(serial, __func__))
2075                 return;
2076
2077         mos7840_port = mos7840_get_port_private(port);
2078
2079         if (mos7840_port == NULL)
2080                 return;
2081
2082         if (!mos7840_port->open) {
2083                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
2084                 return;
2085         }
2086
2087         dev_dbg(&port->dev, "%s", "setting termios - \n");
2088
2089         cflag = tty->termios.c_cflag;
2090
2091         dev_dbg(&port->dev, "%s - clfag %08x iflag %08x\n", __func__,
2092                 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
2093         dev_dbg(&port->dev, "%s - old clfag %08x old iflag %08x\n", __func__,
2094                 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2095         dev_dbg(&port->dev, "%s - port %d\n", __func__, port->number);
2096
2097         /* change the port settings to the new ones specified */
2098
2099         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2100
2101         if (!mos7840_port->read_urb) {
2102                 dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n");
2103                 return;
2104         }
2105
2106         if (mos7840_port->read_urb_busy == false) {
2107                 mos7840_port->read_urb_busy = true;
2108                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2109                 if (status) {
2110                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
2111                             status);
2112                         mos7840_port->read_urb_busy = false;
2113                 }
2114         }
2115 }
2116
2117 /*****************************************************************************
2118  * mos7840_get_lsr_info - get line status register info
2119  *
2120  * Purpose: Let user call ioctl() to get info when the UART physically
2121  *          is emptied.  On bus types like RS485, the transmitter must
2122  *          release the bus after transmitting. This must be done when
2123  *          the transmit shift register is empty, not be done when the
2124  *          transmit holding register is empty.  This functionality
2125  *          allows an RS485 driver to be written in user space.
2126  *****************************************************************************/
2127
2128 static int mos7840_get_lsr_info(struct tty_struct *tty,
2129                                 unsigned int __user *value)
2130 {
2131         int count;
2132         unsigned int result = 0;
2133
2134         count = mos7840_chars_in_buffer(tty);
2135         if (count == 0)
2136                 result = TIOCSER_TEMT;
2137
2138         if (copy_to_user(value, &result, sizeof(int)))
2139                 return -EFAULT;
2140         return 0;
2141 }
2142
2143 /*****************************************************************************
2144  * mos7840_get_serial_info
2145  *      function to get information about serial port
2146  *****************************************************************************/
2147
2148 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2149                                    struct serial_struct __user *retinfo)
2150 {
2151         struct serial_struct tmp;
2152
2153         if (mos7840_port == NULL)
2154                 return -1;
2155
2156         if (!retinfo)
2157                 return -EFAULT;
2158
2159         memset(&tmp, 0, sizeof(tmp));
2160
2161         tmp.type = PORT_16550A;
2162         tmp.line = mos7840_port->port->serial->minor;
2163         tmp.port = mos7840_port->port->number;
2164         tmp.irq = 0;
2165         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2166         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2167         tmp.baud_base = 9600;
2168         tmp.close_delay = 5 * HZ;
2169         tmp.closing_wait = 30 * HZ;
2170
2171         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2172                 return -EFAULT;
2173         return 0;
2174 }
2175
2176 static int mos7840_get_icount(struct tty_struct *tty,
2177                         struct serial_icounter_struct *icount)
2178 {
2179         struct usb_serial_port *port = tty->driver_data;
2180         struct moschip_port *mos7840_port;
2181         struct async_icount cnow;
2182
2183         mos7840_port = mos7840_get_port_private(port);
2184         cnow = mos7840_port->icount;
2185
2186         smp_rmb();
2187         icount->cts = cnow.cts;
2188         icount->dsr = cnow.dsr;
2189         icount->rng = cnow.rng;
2190         icount->dcd = cnow.dcd;
2191         icount->rx = cnow.rx;
2192         icount->tx = cnow.tx;
2193         icount->frame = cnow.frame;
2194         icount->overrun = cnow.overrun;
2195         icount->parity = cnow.parity;
2196         icount->brk = cnow.brk;
2197         icount->buf_overrun = cnow.buf_overrun;
2198
2199         dev_dbg(&port->dev, "%s TIOCGICOUNT RX=%d, TX=%d\n", __func__,
2200                 icount->rx, icount->tx);
2201         return 0;
2202 }
2203
2204 /*****************************************************************************
2205  * SerialIoctl
2206  *      this function handles any ioctl calls to the driver
2207  *****************************************************************************/
2208
2209 static int mos7840_ioctl(struct tty_struct *tty,
2210                          unsigned int cmd, unsigned long arg)
2211 {
2212         struct usb_serial_port *port = tty->driver_data;
2213         void __user *argp = (void __user *)arg;
2214         struct moschip_port *mos7840_port;
2215
2216         struct async_icount cnow;
2217         struct async_icount cprev;
2218
2219         if (mos7840_port_paranoia_check(port, __func__))
2220                 return -1;
2221
2222         mos7840_port = mos7840_get_port_private(port);
2223
2224         if (mos7840_port == NULL)
2225                 return -1;
2226
2227         dev_dbg(&port->dev, "%s - cmd = 0x%x\n", __func__, cmd);
2228
2229         switch (cmd) {
2230                 /* return number of bytes available */
2231
2232         case TIOCSERGETLSR:
2233                 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
2234                 return mos7840_get_lsr_info(tty, argp);
2235
2236         case TIOCGSERIAL:
2237                 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
2238                 return mos7840_get_serial_info(mos7840_port, argp);
2239
2240         case TIOCSSERIAL:
2241                 dev_dbg(&port->dev, "%s TIOCSSERIAL\n", __func__);
2242                 break;
2243
2244         case TIOCMIWAIT:
2245                 dev_dbg(&port->dev, "%s  TIOCMIWAIT\n", __func__);
2246                 cprev = mos7840_port->icount;
2247                 while (1) {
2248                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2249                         mos7840_port->delta_msr_cond = 0;
2250                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2251                                                  (mos7840_port->
2252                                                   delta_msr_cond == 1));
2253
2254                         /* see if a signal did it */
2255                         if (signal_pending(current))
2256                                 return -ERESTARTSYS;
2257                         cnow = mos7840_port->icount;
2258                         smp_rmb();
2259                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2260                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2261                                 return -EIO;    /* no change => error */
2262                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2263                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2264                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2265                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2266                                 return 0;
2267                         }
2268                         cprev = cnow;
2269                 }
2270                 /* NOTREACHED */
2271                 break;
2272
2273         default:
2274                 break;
2275         }
2276         return -ENOIOCTLCMD;
2277 }
2278
2279 static int mos7810_check(struct usb_serial *serial)
2280 {
2281         int i, pass_count = 0;
2282         __u16 data = 0, mcr_data = 0;
2283         __u16 test_pattern = 0x55AA;
2284
2285         /* Store MCR setting */
2286         usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2287                 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
2288                 &mcr_data, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2289
2290         for (i = 0; i < 16; i++) {
2291                 /* Send the 1-bit test pattern out to MCS7810 test pin */
2292                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2293                         MCS_WRREQ, MCS_WR_RTYPE,
2294                         (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
2295                         MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
2296
2297                 /* Read the test pattern back */
2298                 usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2299                         MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &data,
2300                         VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2301
2302                 /* If this is a MCS7810 device, both test patterns must match */
2303                 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
2304                         break;
2305
2306                 pass_count++;
2307         }
2308
2309         /* Restore MCR setting */
2310         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
2311                 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
2312                 0, MOS_WDR_TIMEOUT);
2313
2314         if (pass_count == 16)
2315                 return 1;
2316
2317         return 0;
2318 }
2319
2320 static int mos7840_calc_num_ports(struct usb_serial *serial)
2321 {
2322         __u16 data = 0x00;
2323         int mos7840_num_ports;
2324
2325         usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2326                 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &data,
2327                 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2328
2329         if (serial->dev->descriptor.idProduct == MOSCHIP_DEVICE_ID_7810 ||
2330                 serial->dev->descriptor.idProduct == MOSCHIP_DEVICE_ID_7820) {
2331                 device_type = serial->dev->descriptor.idProduct;
2332         } else {
2333                 /* For a MCS7840 device GPIO0 must be set to 1 */
2334                 if ((data & 0x01) == 1)
2335                         device_type = MOSCHIP_DEVICE_ID_7840;
2336                 else if (mos7810_check(serial))
2337                         device_type = MOSCHIP_DEVICE_ID_7810;
2338                 else
2339                         device_type = MOSCHIP_DEVICE_ID_7820;
2340         }
2341
2342         mos7840_num_ports = (device_type >> 4) & 0x000F;
2343         serial->num_bulk_in = mos7840_num_ports;
2344         serial->num_bulk_out = mos7840_num_ports;
2345         serial->num_ports = mos7840_num_ports;
2346
2347         return mos7840_num_ports;
2348 }
2349
2350 /****************************************************************************
2351  * mos7840_startup
2352  ****************************************************************************/
2353
2354 static int mos7840_startup(struct usb_serial *serial)
2355 {
2356         struct moschip_port *mos7840_port;
2357         struct usb_device *dev;
2358         int i, status;
2359         __u16 Data;
2360
2361         dev = serial->dev;
2362
2363         /* we set up the pointers to the endpoints in the mos7840_open *
2364          * function, as the structures aren't created yet.             */
2365
2366         /* set up port private structures */
2367         for (i = 0; i < serial->num_ports; ++i) {
2368                 dev_dbg(&dev->dev, "mos7840_startup: configuring port %d............\n", i);
2369                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2370                 if (mos7840_port == NULL) {
2371                         dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2372                         status = -ENOMEM;
2373                         i--; /* don't follow NULL pointer cleaning up */
2374                         goto error;
2375                 }
2376
2377                 /* Initialize all port interrupt end point to port 0 int
2378                  * endpoint. Our device has only one interrupt end point
2379                  * common to all port */
2380
2381                 mos7840_port->port = serial->port[i];
2382                 mos7840_set_port_private(serial->port[i], mos7840_port);
2383                 spin_lock_init(&mos7840_port->pool_lock);
2384
2385                 /* minor is not initialised until later by
2386                  * usb-serial.c:get_free_serial() and cannot therefore be used
2387                  * to index device instances */
2388                 mos7840_port->port_num = i + 1;
2389                 dev_dbg(&dev->dev, "serial->port[i]->number = %d\n", serial->port[i]->number);
2390                 dev_dbg(&dev->dev, "serial->port[i]->serial->minor = %d\n", serial->port[i]->serial->minor);
2391                 dev_dbg(&dev->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
2392                 dev_dbg(&dev->dev, "serial->minor = %d\n", serial->minor);
2393
2394                 if (mos7840_port->port_num == 1) {
2395                         mos7840_port->SpRegOffset = 0x0;
2396                         mos7840_port->ControlRegOffset = 0x1;
2397                         mos7840_port->DcrRegOffset = 0x4;
2398                 } else if ((mos7840_port->port_num == 2)
2399                            && (serial->num_ports == 4)) {
2400                         mos7840_port->SpRegOffset = 0x8;
2401                         mos7840_port->ControlRegOffset = 0x9;
2402                         mos7840_port->DcrRegOffset = 0x16;
2403                 } else if ((mos7840_port->port_num == 2)
2404                            && (serial->num_ports == 2)) {
2405                         mos7840_port->SpRegOffset = 0xa;
2406                         mos7840_port->ControlRegOffset = 0xb;
2407                         mos7840_port->DcrRegOffset = 0x19;
2408                 } else if ((mos7840_port->port_num == 3)
2409                            && (serial->num_ports == 4)) {
2410                         mos7840_port->SpRegOffset = 0xa;
2411                         mos7840_port->ControlRegOffset = 0xb;
2412                         mos7840_port->DcrRegOffset = 0x19;
2413                 } else if ((mos7840_port->port_num == 4)
2414                            && (serial->num_ports == 4)) {
2415                         mos7840_port->SpRegOffset = 0xc;
2416                         mos7840_port->ControlRegOffset = 0xd;
2417                         mos7840_port->DcrRegOffset = 0x1c;
2418                 }
2419                 mos7840_dump_serial_port(serial->port[i], mos7840_port);
2420                 mos7840_set_port_private(serial->port[i], mos7840_port);
2421
2422                 /* enable rx_disable bit in control register */
2423                 status = mos7840_get_reg_sync(serial->port[i],
2424                                  mos7840_port->ControlRegOffset, &Data);
2425                 if (status < 0) {
2426                         dev_dbg(&dev->dev, "Reading ControlReg failed status-0x%x\n", status);
2427                         break;
2428                 } else
2429                         dev_dbg(&dev->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
2430                 Data |= 0x08;   /* setting driver done bit */
2431                 Data |= 0x04;   /* sp1_bit to have cts change reflect in
2432                                    modem status reg */
2433
2434                 /* Data |= 0x20; //rx_disable bit */
2435                 status = mos7840_set_reg_sync(serial->port[i],
2436                                          mos7840_port->ControlRegOffset, Data);
2437                 if (status < 0) {
2438                         dev_dbg(&dev->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2439                         break;
2440                 } else
2441                         dev_dbg(&dev->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
2442
2443                 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2444                    and 0x24 in DCR3 */
2445                 Data = 0x01;
2446                 status = mos7840_set_reg_sync(serial->port[i],
2447                          (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2448                 if (status < 0) {
2449                         dev_dbg(&dev->dev, "Writing DCR0 failed status-0x%x\n", status);
2450                         break;
2451                 } else
2452                         dev_dbg(&dev->dev, "DCR0 Writing success status%d\n", status);
2453
2454                 Data = 0x05;
2455                 status = mos7840_set_reg_sync(serial->port[i],
2456                          (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2457                 if (status < 0) {
2458                         dev_dbg(&dev->dev, "Writing DCR1 failed status-0x%x\n", status);
2459                         break;
2460                 } else
2461                         dev_dbg(&dev->dev, "DCR1 Writing success status%d\n", status);
2462
2463                 Data = 0x24;
2464                 status = mos7840_set_reg_sync(serial->port[i],
2465                          (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2466                 if (status < 0) {
2467                         dev_dbg(&dev->dev, "Writing DCR2 failed status-0x%x\n", status);
2468                         break;
2469                 } else
2470                         dev_dbg(&dev->dev, "DCR2 Writing success status%d\n", status);
2471
2472                 /* write values in clkstart0x0 and clkmulti 0x20 */
2473                 Data = 0x0;
2474                 status = mos7840_set_reg_sync(serial->port[i],
2475                                          CLK_START_VALUE_REGISTER, Data);
2476                 if (status < 0) {
2477                         dev_dbg(&dev->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2478                         break;
2479                 } else
2480                         dev_dbg(&dev->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2481
2482                 Data = 0x20;
2483                 status = mos7840_set_reg_sync(serial->port[i],
2484                                         CLK_MULTI_REGISTER, Data);
2485                 if (status < 0) {
2486                         dev_dbg(&dev->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
2487                         goto error;
2488                 } else
2489                         dev_dbg(&dev->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
2490
2491                 /* write value 0x0 to scratchpad register */
2492                 Data = 0x00;
2493                 status = mos7840_set_uart_reg(serial->port[i],
2494                                                 SCRATCH_PAD_REGISTER, Data);
2495                 if (status < 0) {
2496                         dev_dbg(&dev->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
2497                         break;
2498                 } else
2499                         dev_dbg(&dev->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
2500
2501                 /* Zero Length flag register */
2502                 if ((mos7840_port->port_num != 1)
2503                     && (serial->num_ports == 2)) {
2504
2505                         Data = 0xff;
2506                         status = mos7840_set_reg_sync(serial->port[i],
2507                                       (__u16) (ZLP_REG1 +
2508                                       ((__u16)mos7840_port->port_num)), Data);
2509                         dev_dbg(&dev->dev, "ZLIP offset %x\n",
2510                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
2511                         if (status < 0) {
2512                                 dev_dbg(&dev->dev, "Writing ZLP_REG%d failed status-0x%x\n", i + 2, status);
2513                                 break;
2514                         } else
2515                                 dev_dbg(&dev->dev, "ZLP_REG%d Writing success status%d\n", i + 2, status);
2516                 } else {
2517                         Data = 0xff;
2518                         status = mos7840_set_reg_sync(serial->port[i],
2519                               (__u16) (ZLP_REG1 +
2520                               ((__u16)mos7840_port->port_num) - 0x1), Data);
2521                         dev_dbg(&dev->dev, "ZLIP offset %x\n",
2522                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
2523                         if (status < 0) {
2524                                 dev_dbg(&dev->dev, "Writing ZLP_REG%d failed status-0x%x\n", i + 1, status);
2525                                 break;
2526                         } else
2527                                 dev_dbg(&dev->dev, "ZLP_REG%d Writing success status%d\n", i + 1, status);
2528
2529                 }
2530                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2531                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2532                 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2533                                                                 GFP_KERNEL);
2534                 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2535                                                         !mos7840_port->dr) {
2536                         status = -ENOMEM;
2537                         goto error;
2538                 }
2539
2540                 mos7840_port->has_led = false;
2541
2542                 /* Initialize LED timers */
2543                 if (device_type == MOSCHIP_DEVICE_ID_7810) {
2544                         mos7840_port->has_led = true;
2545
2546                         init_timer(&mos7840_port->led_timer1);
2547                         mos7840_port->led_timer1.function = mos7840_led_off;
2548                         mos7840_port->led_timer1.expires =
2549                                         jiffies + msecs_to_jiffies(LED_ON_MS);
2550                         mos7840_port->led_timer1.data =
2551                                                 (unsigned long)mos7840_port;
2552
2553                         init_timer(&mos7840_port->led_timer2);
2554                         mos7840_port->led_timer2.function =
2555                                                 mos7840_led_flag_off;
2556                         mos7840_port->led_timer2.expires =
2557                                         jiffies + msecs_to_jiffies(LED_OFF_MS);
2558                         mos7840_port->led_timer2.data =
2559                                                 (unsigned long)mos7840_port;
2560
2561                         mos7840_port->led_flag = false;
2562
2563                         /* Turn off LED */
2564                         mos7840_set_led_sync(serial->port[i],
2565                                                 MODEM_CONTROL_REGISTER, 0x0300);
2566                 }
2567         }
2568
2569         /* Zero Length flag enable */
2570         Data = 0x0f;
2571         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2572         if (status < 0) {
2573                 dev_dbg(&dev->dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
2574                 goto error;
2575         } else
2576                 dev_dbg(&dev->dev, "ZLP_REG5 Writing success status%d\n", status);
2577
2578         /* setting configuration feature to one */
2579         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2580                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, MOS_WDR_TIMEOUT);
2581         return 0;
2582 error:
2583         for (/* nothing */; i >= 0; i--) {
2584                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2585
2586                 kfree(mos7840_port->dr);
2587                 kfree(mos7840_port->ctrl_buf);
2588                 usb_free_urb(mos7840_port->control_urb);
2589                 kfree(mos7840_port);
2590                 serial->port[i] = NULL;
2591         }
2592         return status;
2593 }
2594
2595 /****************************************************************************
2596  * mos7840_disconnect
2597  *      This function is called whenever the device is removed from the usb bus.
2598  ****************************************************************************/
2599
2600 static void mos7840_disconnect(struct usb_serial *serial)
2601 {
2602         int i;
2603         unsigned long flags;
2604         struct moschip_port *mos7840_port;
2605
2606         /* check for the ports to be closed,close the ports and disconnect */
2607
2608         /* free private structure allocated for serial port  *
2609          * stop reads and writes on all ports                */
2610
2611         for (i = 0; i < serial->num_ports; ++i) {
2612                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2613                 if (mos7840_port) {
2614                         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2615                         mos7840_port->zombie = 1;
2616                         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2617                         usb_kill_urb(mos7840_port->control_urb);
2618                 }
2619         }
2620 }
2621
2622 /****************************************************************************
2623  * mos7840_release
2624  *      This function is called when the usb_serial structure is freed.
2625  ****************************************************************************/
2626
2627 static void mos7840_release(struct usb_serial *serial)
2628 {
2629         int i;
2630         struct moschip_port *mos7840_port;
2631
2632         /* check for the ports to be closed,close the ports and disconnect */
2633
2634         /* free private structure allocated for serial port  *
2635          * stop reads and writes on all ports                */
2636
2637         for (i = 0; i < serial->num_ports; ++i) {
2638                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2639                 if (mos7840_port) {
2640                         if (mos7840_port->has_led) {
2641                                 /* Turn off LED */
2642                                 mos7840_set_led_sync(mos7840_port->port,
2643                                                 MODEM_CONTROL_REGISTER, 0x0300);
2644
2645                                 del_timer_sync(&mos7840_port->led_timer1);
2646                                 del_timer_sync(&mos7840_port->led_timer2);
2647                         }
2648                         kfree(mos7840_port->ctrl_buf);
2649                         kfree(mos7840_port->dr);
2650                         kfree(mos7840_port);
2651                 }
2652         }
2653 }
2654
2655 static struct usb_serial_driver moschip7840_4port_device = {
2656         .driver = {
2657                    .owner = THIS_MODULE,
2658                    .name = "mos7840",
2659                    },
2660         .description = DRIVER_DESC,
2661         .id_table = id_table,
2662         .num_ports = 4,
2663         .open = mos7840_open,
2664         .close = mos7840_close,
2665         .write = mos7840_write,
2666         .write_room = mos7840_write_room,
2667         .chars_in_buffer = mos7840_chars_in_buffer,
2668         .throttle = mos7840_throttle,
2669         .unthrottle = mos7840_unthrottle,
2670         .calc_num_ports = mos7840_calc_num_ports,
2671 #ifdef MCSSerialProbe
2672         .probe = mos7840_serial_probe,
2673 #endif
2674         .ioctl = mos7840_ioctl,
2675         .set_termios = mos7840_set_termios,
2676         .break_ctl = mos7840_break,
2677         .tiocmget = mos7840_tiocmget,
2678         .tiocmset = mos7840_tiocmset,
2679         .get_icount = mos7840_get_icount,
2680         .attach = mos7840_startup,
2681         .disconnect = mos7840_disconnect,
2682         .release = mos7840_release,
2683         .read_bulk_callback = mos7840_bulk_in_callback,
2684         .read_int_callback = mos7840_interrupt_callback,
2685 };
2686
2687 static struct usb_serial_driver * const serial_drivers[] = {
2688         &moschip7840_4port_device, NULL
2689 };
2690
2691 module_usb_serial_driver(serial_drivers, id_table);
2692
2693 MODULE_DESCRIPTION(DRIVER_DESC);
2694 MODULE_LICENSE("GPL");