linux/drivers/usb/serial/mos7720.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * mos7720.c
   4 *   Controls the Moschip 7720 usb to dual port serial converter
   5 *
   6 * Copyright 2006 Moschip Semiconductor Tech. Ltd.
   7 *
   8 * Developed by:
   9 *      Vijaya Kumar <vijaykumar.gn@gmail.com>
  10 *      Ajay Kumar <naanuajay@yahoo.com>
  11 *      Gurudeva <ngurudeva@yahoo.com>
  12 *
  13 * Cleaned up from the original by:
  14 *      Greg Kroah-Hartman <gregkh@suse.de>
  15 *
  16 * Originally based on drivers/usb/serial/io_edgeport.c which is:
  17 *      Copyright (C) 2000 Inside Out Networks, All rights reserved.
  18 *      Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
  19 */
  20#include <linux/kernel.h>
  21#include <linux/errno.h>
  22#include <linux/slab.h>
  23#include <linux/tty.h>
  24#include <linux/tty_driver.h>
  25#include <linux/tty_flip.h>
  26#include <linux/module.h>
  27#include <linux/spinlock.h>
  28#include <linux/serial.h>
  29#include <linux/serial_reg.h>
  30#include <linux/usb.h>
  31#include <linux/usb/serial.h>
  32#include <linux/uaccess.h>
  33#include <linux/parport.h>
  34
  35#define DRIVER_AUTHOR "Aspire Communications pvt Ltd."
  36#define DRIVER_DESC "Moschip USB Serial Driver"
  37
  38/* default urb timeout */
  39#define MOS_WDR_TIMEOUT 5000
  40
  41#define MOS_MAX_PORT    0x02
  42#define MOS_WRITE       0x0E
  43#define MOS_READ        0x0D
  44
  45/* Interrupt Routines Defines   */
  46#define SERIAL_IIR_RLS  0x06
  47#define SERIAL_IIR_RDA  0x04
  48#define SERIAL_IIR_CTI  0x0c
  49#define SERIAL_IIR_THR  0x02
  50#define SERIAL_IIR_MS   0x00
  51
  52#define NUM_URBS                        16      /* URB Count */
  53#define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size */
  54
  55/* This structure holds all of the local serial port information */
  56struct moschip_port {
  57        __u8    shadowLCR;              /* last LCR value received */
  58        __u8    shadowMCR;              /* last MCR value received */
  59        __u8    shadowMSR;              /* last MSR value received */
  60        char                    open;
  61        struct usb_serial_port  *port;  /* loop back to the owner */
  62        struct urb              *write_urb_pool[NUM_URBS];
  63};
  64
  65#define USB_VENDOR_ID_MOSCHIP           0x9710
  66#define MOSCHIP_DEVICE_ID_7720          0x7720
  67#define MOSCHIP_DEVICE_ID_7715          0x7715
  68
  69static const struct usb_device_id id_table[] = {
  70        { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7720) },
  71        { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7715) },
  72        { } /* terminating entry */
  73};
  74MODULE_DEVICE_TABLE(usb, id_table);
  75
  76#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
  77
  78/* initial values for parport regs */
  79#define DCR_INIT_VAL       0x0c /* SLCTIN, nINIT */
  80#define ECR_INIT_VAL       0x00 /* SPP mode */
  81
  82struct urbtracker {
  83        struct mos7715_parport  *mos_parport;
  84        struct list_head        urblist_entry;
  85        struct kref             ref_count;
  86        struct urb              *urb;
  87        struct usb_ctrlrequest  *setup;
  88};
  89
  90enum mos7715_pp_modes {
  91        SPP = 0<<5,
  92        PS2 = 1<<5,      /* moschip calls this 'NIBBLE' mode */
  93        PPF = 2<<5,      /* moschip calls this 'CB-FIFO mode */
  94};
  95
  96struct mos7715_parport {
  97        struct parport          *pp;           /* back to containing struct */
  98        struct kref             ref_count;     /* to instance of this struct */
  99        struct list_head        deferred_urbs; /* list deferred async urbs */
 100        struct list_head        active_urbs;   /* list async urbs in flight */
 101        spinlock_t              listlock;      /* protects list access */
 102        bool                    msg_pending;   /* usb sync call pending */
 103        struct completion       syncmsg_compl; /* usb sync call completed */
 104        struct tasklet_struct   urb_tasklet;   /* for sending deferred urbs */
 105        struct usb_serial       *serial;       /* back to containing struct */
 106        __u8                    shadowECR;     /* parallel port regs... */
 107        __u8                    shadowDCR;
 108        atomic_t                shadowDSR;     /* updated in int-in callback */
 109};
 110
 111/* lock guards against dereferencing NULL ptr in parport ops callbacks */
 112static DEFINE_SPINLOCK(release_lock);
 113
 114#endif  /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
 115
 116static const unsigned int dummy; /* for clarity in register access fns */
 117
 118enum mos_regs {
 119        MOS7720_THR,              /* serial port regs */
 120        MOS7720_RHR,
 121        MOS7720_IER,
 122        MOS7720_FCR,
 123        MOS7720_ISR,
 124        MOS7720_LCR,
 125        MOS7720_MCR,
 126        MOS7720_LSR,
 127        MOS7720_MSR,
 128        MOS7720_SPR,
 129        MOS7720_DLL,
 130        MOS7720_DLM,
 131        MOS7720_DPR,              /* parallel port regs */
 132        MOS7720_DSR,
 133        MOS7720_DCR,
 134        MOS7720_ECR,
 135        MOS7720_SP1_REG,          /* device control regs */
 136        MOS7720_SP2_REG,          /* serial port 2 (7720 only) */
 137        MOS7720_PP_REG,
 138        MOS7720_SP_CONTROL_REG,
 139};
 140
 141/*
 142 * Return the correct value for the Windex field of the setup packet
 143 * for a control endpoint message.  See the 7715 datasheet.
 144 */
 145static inline __u16 get_reg_index(enum mos_regs reg)
 146{
 147        static const __u16 mos7715_index_lookup_table[] = {
 148                0x00,           /* MOS7720_THR */
 149                0x00,           /* MOS7720_RHR */
 150                0x01,           /* MOS7720_IER */
 151                0x02,           /* MOS7720_FCR */
 152                0x02,           /* MOS7720_ISR */
 153                0x03,           /* MOS7720_LCR */
 154                0x04,           /* MOS7720_MCR */
 155                0x05,           /* MOS7720_LSR */
 156                0x06,           /* MOS7720_MSR */
 157                0x07,           /* MOS7720_SPR */
 158                0x00,           /* MOS7720_DLL */
 159                0x01,           /* MOS7720_DLM */
 160                0x00,           /* MOS7720_DPR */
 161                0x01,           /* MOS7720_DSR */
 162                0x02,           /* MOS7720_DCR */
 163                0x0a,           /* MOS7720_ECR */
 164                0x01,           /* MOS7720_SP1_REG */
 165                0x02,           /* MOS7720_SP2_REG (7720 only) */
 166                0x04,           /* MOS7720_PP_REG (7715 only) */
 167                0x08,           /* MOS7720_SP_CONTROL_REG */
 168        };
 169        return mos7715_index_lookup_table[reg];
 170}
 171
 172/*
 173 * Return the correct value for the upper byte of the Wvalue field of
 174 * the setup packet for a control endpoint message.
 175 */
 176static inline __u16 get_reg_value(enum mos_regs reg,
 177                                  unsigned int serial_portnum)
 178{
 179        if (reg >= MOS7720_SP1_REG)     /* control reg */
 180                return 0x0000;
 181
 182        else if (reg >= MOS7720_DPR)    /* parallel port reg (7715 only) */
 183                return 0x0100;
 184
 185        else                          /* serial port reg */
 186                return (serial_portnum + 2) << 8;
 187}
 188
 189/*
 190 * Write data byte to the specified device register.  The data is embedded in
 191 * the value field of the setup packet. serial_portnum is ignored for registers
 192 * not specific to a particular serial port.
 193 */
 194static int write_mos_reg(struct usb_serial *serial, unsigned int serial_portnum,
 195                         enum mos_regs reg, __u8 data)
 196{
 197        struct usb_device *usbdev = serial->dev;
 198        unsigned int pipe = usb_sndctrlpipe(usbdev, 0);
 199        __u8 request = (__u8)0x0e;
 200        __u8 requesttype = (__u8)0x40;
 201        __u16 index = get_reg_index(reg);
 202        __u16 value = get_reg_value(reg, serial_portnum) + data;
 203        int status = usb_control_msg(usbdev, pipe, request, requesttype, value,
 204                                     index, NULL, 0, MOS_WDR_TIMEOUT);
 205        if (status < 0)
 206                dev_err(&usbdev->dev,
 207                        "mos7720: usb_control_msg() failed: %d\n", status);
 208        return status;
 209}
 210
 211/*
 212 * Read data byte from the specified device register.  The data returned by the
 213 * device is embedded in the value field of the setup packet.  serial_portnum is
 214 * ignored for registers that are not specific to a particular serial port.
 215 */
 216static int read_mos_reg(struct usb_serial *serial, unsigned int serial_portnum,
 217                        enum mos_regs reg, __u8 *data)
 218{
 219        struct usb_device *usbdev = serial->dev;
 220        unsigned int pipe = usb_rcvctrlpipe(usbdev, 0);
 221        __u8 request = (__u8)0x0d;
 222        __u8 requesttype = (__u8)0xc0;
 223        __u16 index = get_reg_index(reg);
 224        __u16 value = get_reg_value(reg, serial_portnum);
 225        u8 *buf;
 226        int status;
 227
 228        buf = kmalloc(1, GFP_KERNEL);
 229        if (!buf)
 230                return -ENOMEM;
 231
 232        status = usb_control_msg(usbdev, pipe, request, requesttype, value,
 233                                     index, buf, 1, MOS_WDR_TIMEOUT);
 234        if (status == 1) {
 235                *data = *buf;
 236        } else {
 237                dev_err(&usbdev->dev,
 238                        "mos7720: usb_control_msg() failed: %d\n", status);
 239                if (status >= 0)
 240                        status = -EIO;
 241                *data = 0;
 242        }
 243
 244        kfree(buf);
 245
 246        return status;
 247}
 248
 249#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
 250
 251static inline int mos7715_change_mode(struct mos7715_parport *mos_parport,
 252                                      enum mos7715_pp_modes mode)
 253{
 254        mos_parport->shadowECR = mode;
 255        write_mos_reg(mos_parport->serial, dummy, MOS7720_ECR,
 256                      mos_parport->shadowECR);
 257        return 0;
 258}
 259
 260static void destroy_mos_parport(struct kref *kref)
 261{
 262        struct mos7715_parport *mos_parport =
 263                container_of(kref, struct mos7715_parport, ref_count);
 264
 265        kfree(mos_parport);
 266}
 267
 268static void destroy_urbtracker(struct kref *kref)
 269{
 270        struct urbtracker *urbtrack =
 271                container_of(kref, struct urbtracker, ref_count);
 272        struct mos7715_parport *mos_parport = urbtrack->mos_parport;
 273
 274        usb_free_urb(urbtrack->urb);
 275        kfree(urbtrack->setup);
 276        kfree(urbtrack);
 277        kref_put(&mos_parport->ref_count, destroy_mos_parport);
 278}
 279
 280/*
 281 * This runs as a tasklet when sending an urb in a non-blocking parallel
 282 * port callback had to be deferred because the disconnect mutex could not be
 283 * obtained at the time.
 284 */
 285static void send_deferred_urbs(unsigned long _mos_parport)
 286{
 287        int ret_val;
 288        unsigned long flags;
 289        struct mos7715_parport *mos_parport = (void *)_mos_parport;
 290        struct urbtracker *urbtrack, *tmp;
 291        struct list_head *cursor, *next;
 292        struct device *dev;
 293
 294        /* if release function ran, game over */
 295        if (unlikely(mos_parport->serial == NULL))
 296                return;
 297
 298        dev = &mos_parport->serial->dev->dev;
 299
 300        /* try again to get the mutex */
 301        if (!mutex_trylock(&mos_parport->serial->disc_mutex)) {
 302                dev_dbg(dev, "%s: rescheduling tasklet\n", __func__);
 303                tasklet_schedule(&mos_parport->urb_tasklet);
 304                return;
 305        }
 306
 307        /* if device disconnected, game over */
 308        if (unlikely(mos_parport->serial->disconnected)) {
 309                mutex_unlock(&mos_parport->serial->disc_mutex);
 310                return;
 311        }
 312
 313        spin_lock_irqsave(&mos_parport->listlock, flags);
 314        if (list_empty(&mos_parport->deferred_urbs)) {
 315                spin_unlock_irqrestore(&mos_parport->listlock, flags);
 316                mutex_unlock(&mos_parport->serial->disc_mutex);
 317                dev_dbg(dev, "%s: deferred_urbs list empty\n", __func__);
 318                return;
 319        }
 320
 321        /* move contents of deferred_urbs list to active_urbs list and submit */
 322        list_for_each_safe(cursor, next, &mos_parport->deferred_urbs)
 323                list_move_tail(cursor, &mos_parport->active_urbs);
 324        list_for_each_entry_safe(urbtrack, tmp, &mos_parport->active_urbs,
 325                            urblist_entry) {
 326                ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
 327                dev_dbg(dev, "%s: urb submitted\n", __func__);
 328                if (ret_val) {
 329                        dev_err(dev, "usb_submit_urb() failed: %d\n", ret_val);
 330                        list_del(&urbtrack->urblist_entry);
 331                        kref_put(&urbtrack->ref_count, destroy_urbtracker);
 332                }
 333        }
 334        spin_unlock_irqrestore(&mos_parport->listlock, flags);
 335        mutex_unlock(&mos_parport->serial->disc_mutex);
 336}
 337
 338/* callback for parallel port control urbs submitted asynchronously */
 339static void async_complete(struct urb *urb)
 340{
 341        struct urbtracker *urbtrack = urb->context;
 342        int status = urb->status;
 343        unsigned long flags;
 344
 345        if (unlikely(status))
 346                dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n", __func__, status);
 347
 348        /* remove the urbtracker from the active_urbs list */
 349        spin_lock_irqsave(&urbtrack->mos_parport->listlock, flags);
 350        list_del(&urbtrack->urblist_entry);
 351        spin_unlock_irqrestore(&urbtrack->mos_parport->listlock, flags);
 352        kref_put(&urbtrack->ref_count, destroy_urbtracker);
 353}
 354
 355static int write_parport_reg_nonblock(struct mos7715_parport *mos_parport,
 356                                      enum mos_regs reg, __u8 data)
 357{
 358        struct urbtracker *urbtrack;
 359        int ret_val;
 360        unsigned long flags;
 361        struct usb_serial *serial = mos_parport->serial;
 362        struct usb_device *usbdev = serial->dev;
 363
 364        /* create and initialize the control urb and containing urbtracker */
 365        urbtrack = kmalloc(sizeof(struct urbtracker), GFP_ATOMIC);
 366        if (!urbtrack)
 367                return -ENOMEM;
 368
 369        kref_get(&mos_parport->ref_count);
 370        urbtrack->mos_parport = mos_parport;
 371        urbtrack->urb = usb_alloc_urb(0, GFP_ATOMIC);
 372        if (!urbtrack->urb) {
 373                kfree(urbtrack);
 374                return -ENOMEM;
 375        }
 376        urbtrack->setup = kmalloc(sizeof(*urbtrack->setup), GFP_ATOMIC);
 377        if (!urbtrack->setup) {
 378                usb_free_urb(urbtrack->urb);
 379                kfree(urbtrack);
 380                return -ENOMEM;
 381        }
 382        urbtrack->setup->bRequestType = (__u8)0x40;
 383        urbtrack->setup->bRequest = (__u8)0x0e;
 384        urbtrack->setup->wValue = cpu_to_le16(get_reg_value(reg, dummy));
 385        urbtrack->setup->wIndex = cpu_to_le16(get_reg_index(reg));
 386        urbtrack->setup->wLength = 0;
 387        usb_fill_control_urb(urbtrack->urb, usbdev,
 388                             usb_sndctrlpipe(usbdev, 0),
 389                             (unsigned char *)urbtrack->setup,
 390                             NULL, 0, async_complete, urbtrack);
 391        kref_init(&urbtrack->ref_count);
 392        INIT_LIST_HEAD(&urbtrack->urblist_entry);
 393
 394        /*
 395         * get the disconnect mutex, or add tracker to the deferred_urbs list
 396         * and schedule a tasklet to try again later
 397         */
 398        if (!mutex_trylock(&serial->disc_mutex)) {
 399                spin_lock_irqsave(&mos_parport->listlock, flags);
 400                list_add_tail(&urbtrack->urblist_entry,
 401                              &mos_parport->deferred_urbs);
 402                spin_unlock_irqrestore(&mos_parport->listlock, flags);
 403                tasklet_schedule(&mos_parport->urb_tasklet);
 404                dev_dbg(&usbdev->dev, "tasklet scheduled\n");
 405                return 0;
 406        }
 407
 408        /* bail if device disconnected */
 409        if (serial->disconnected) {
 410                kref_put(&urbtrack->ref_count, destroy_urbtracker);
 411                mutex_unlock(&serial->disc_mutex);
 412                return -ENODEV;
 413        }
 414
 415        /* add the tracker to the active_urbs list and submit */
 416        spin_lock_irqsave(&mos_parport->listlock, flags);
 417        list_add_tail(&urbtrack->urblist_entry, &mos_parport->active_urbs);
 418        spin_unlock_irqrestore(&mos_parport->listlock, flags);
 419        ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
 420        mutex_unlock(&serial->disc_mutex);
 421        if (ret_val) {
 422                dev_err(&usbdev->dev,
 423                        "%s: submit_urb() failed: %d\n", __func__, ret_val);
 424                spin_lock_irqsave(&mos_parport->listlock, flags);
 425                list_del(&urbtrack->urblist_entry);
 426                spin_unlock_irqrestore(&mos_parport->listlock, flags);
 427                kref_put(&urbtrack->ref_count, destroy_urbtracker);
 428                return ret_val;
 429        }
 430        return 0;
 431}
 432
 433/*
 434 * This is the the common top part of all parallel port callback operations that
 435 * send synchronous messages to the device.  This implements convoluted locking
 436 * that avoids two scenarios: (1) a port operation is called after usbserial
 437 * has called our release function, at which point struct mos7715_parport has
 438 * been destroyed, and (2) the device has been disconnected, but usbserial has
 439 * not called the release function yet because someone has a serial port open.
 440 * The shared release_lock prevents the first, and the mutex and disconnected
 441 * flag maintained by usbserial covers the second.  We also use the msg_pending
 442 * flag to ensure that all synchronous usb message calls have completed before
 443 * our release function can return.
 444 */
 445static int parport_prologue(struct parport *pp)
 446{
 447        struct mos7715_parport *mos_parport;
 448
 449        spin_lock(&release_lock);
 450        mos_parport = pp->private_data;
 451        if (unlikely(mos_parport == NULL)) {
 452                /* release fn called, port struct destroyed */
 453                spin_unlock(&release_lock);
 454                return -1;
 455        }
 456        mos_parport->msg_pending = true;   /* synch usb call pending */
 457        reinit_completion(&mos_parport->syncmsg_compl);
 458        spin_unlock(&release_lock);
 459
 460        mutex_lock(&mos_parport->serial->disc_mutex);
 461        if (mos_parport->serial->disconnected) {
 462                /* device disconnected */
 463                mutex_unlock(&mos_parport->serial->disc_mutex);
 464                mos_parport->msg_pending = false;
 465                complete(&mos_parport->syncmsg_compl);
 466                return -1;
 467        }
 468
 469        return 0;
 470}
 471
 472/*
 473 * This is the common bottom part of all parallel port functions that send
 474 * synchronous messages to the device.
 475 */
 476static inline void parport_epilogue(struct parport *pp)
 477{
 478        struct mos7715_parport *mos_parport = pp->private_data;
 479        mutex_unlock(&mos_parport->serial->disc_mutex);
 480        mos_parport->msg_pending = false;
 481        complete(&mos_parport->syncmsg_compl);
 482}
 483
 484static void parport_mos7715_write_data(struct parport *pp, unsigned char d)
 485{
 486        struct mos7715_parport *mos_parport = pp->private_data;
 487
 488        if (parport_prologue(pp) < 0)
 489                return;
 490        mos7715_change_mode(mos_parport, SPP);
 491        write_mos_reg(mos_parport->serial, dummy, MOS7720_DPR, (__u8)d);
 492        parport_epilogue(pp);
 493}
 494
 495static unsigned char parport_mos7715_read_data(struct parport *pp)
 496{
 497        struct mos7715_parport *mos_parport = pp->private_data;
 498        unsigned char d;
 499
 500        if (parport_prologue(pp) < 0)
 501                return 0;
 502        read_mos_reg(mos_parport->serial, dummy, MOS7720_DPR, &d);
 503        parport_epilogue(pp);
 504        return d;
 505}
 506
 507static void parport_mos7715_write_control(struct parport *pp, unsigned char d)
 508{
 509        struct mos7715_parport *mos_parport = pp->private_data;
 510        __u8 data;
 511
 512        if (parport_prologue(pp) < 0)
 513                return;
 514        data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0);
 515        write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, data);
 516        mos_parport->shadowDCR = data;
 517        parport_epilogue(pp);
 518}
 519
 520static unsigned char parport_mos7715_read_control(struct parport *pp)
 521{
 522        struct mos7715_parport *mos_parport;
 523        __u8 dcr;
 524
 525        spin_lock(&release_lock);
 526        mos_parport = pp->private_data;
 527        if (unlikely(mos_parport == NULL)) {
 528                spin_unlock(&release_lock);
 529                return 0;
 530        }
 531        dcr = mos_parport->shadowDCR & 0x0f;
 532        spin_unlock(&release_lock);
 533        return dcr;
 534}
 535
 536static unsigned char parport_mos7715_frob_control(struct parport *pp,
 537                                                  unsigned char mask,
 538                                                  unsigned char val)
 539{
 540        struct mos7715_parport *mos_parport = pp->private_data;
 541        __u8 dcr;
 542
 543        mask &= 0x0f;
 544        val &= 0x0f;
 545        if (parport_prologue(pp) < 0)
 546                return 0;
 547        mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val;
 548        write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
 549                      mos_parport->shadowDCR);
 550        dcr = mos_parport->shadowDCR & 0x0f;
 551        parport_epilogue(pp);
 552        return dcr;
 553}
 554
 555static unsigned char parport_mos7715_read_status(struct parport *pp)
 556{
 557        unsigned char status;
 558        struct mos7715_parport *mos_parport;
 559
 560        spin_lock(&release_lock);
 561        mos_parport = pp->private_data;
 562        if (unlikely(mos_parport == NULL)) {    /* release called */
 563                spin_unlock(&release_lock);
 564                return 0;
 565        }
 566        status = atomic_read(&mos_parport->shadowDSR) & 0xf8;
 567        spin_unlock(&release_lock);
 568        return status;
 569}
 570
 571static void parport_mos7715_enable_irq(struct parport *pp)
 572{
 573}
 574
 575static void parport_mos7715_disable_irq(struct parport *pp)
 576{
 577}
 578
 579static void parport_mos7715_data_forward(struct parport *pp)
 580{
 581        struct mos7715_parport *mos_parport = pp->private_data;
 582
 583        if (parport_prologue(pp) < 0)
 584                return;
 585        mos7715_change_mode(mos_parport, PS2);
 586        mos_parport->shadowDCR &=  ~0x20;
 587        write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
 588                      mos_parport->shadowDCR);
 589        parport_epilogue(pp);
 590}
 591
 592static void parport_mos7715_data_reverse(struct parport *pp)
 593{
 594        struct mos7715_parport *mos_parport = pp->private_data;
 595
 596        if (parport_prologue(pp) < 0)
 597                return;
 598        mos7715_change_mode(mos_parport, PS2);
 599        mos_parport->shadowDCR |= 0x20;
 600        write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
 601                      mos_parport->shadowDCR);
 602        parport_epilogue(pp);
 603}
 604
 605static void parport_mos7715_init_state(struct pardevice *dev,
 606                                       struct parport_state *s)
 607{
 608        s->u.pc.ctr = DCR_INIT_VAL;
 609        s->u.pc.ecr = ECR_INIT_VAL;
 610}
 611
 612/* N.B. Parport core code requires that this function not block */
 613static void parport_mos7715_save_state(struct parport *pp,
 614                                       struct parport_state *s)
 615{
 616        struct mos7715_parport *mos_parport;
 617
 618        spin_lock(&release_lock);
 619        mos_parport = pp->private_data;
 620        if (unlikely(mos_parport == NULL)) {    /* release called */
 621                spin_unlock(&release_lock);
 622                return;
 623        }
 624        s->u.pc.ctr = mos_parport->shadowDCR;
 625        s->u.pc.ecr = mos_parport->shadowECR;
 626        spin_unlock(&release_lock);
 627}
 628
 629/* N.B. Parport core code requires that this function not block */
 630static void parport_mos7715_restore_state(struct parport *pp,
 631                                          struct parport_state *s)
 632{
 633        struct mos7715_parport *mos_parport;
 634
 635        spin_lock(&release_lock);
 636        mos_parport = pp->private_data;
 637        if (unlikely(mos_parport == NULL)) {    /* release called */
 638                spin_unlock(&release_lock);
 639                return;
 640        }
 641        write_parport_reg_nonblock(mos_parport, MOS7720_DCR,
 642                                   mos_parport->shadowDCR);
 643        write_parport_reg_nonblock(mos_parport, MOS7720_ECR,
 644                                   mos_parport->shadowECR);
 645        spin_unlock(&release_lock);
 646}
 647
 648static size_t parport_mos7715_write_compat(struct parport *pp,
 649                                           const void *buffer,
 650                                           size_t len, int flags)
 651{
 652        int retval;
 653        struct mos7715_parport *mos_parport = pp->private_data;
 654        int actual_len;
 655
 656        if (parport_prologue(pp) < 0)
 657                return 0;
 658        mos7715_change_mode(mos_parport, PPF);
 659        retval = usb_bulk_msg(mos_parport->serial->dev,
 660                              usb_sndbulkpipe(mos_parport->serial->dev, 2),
 661                              (void *)buffer, len, &actual_len,
 662                              MOS_WDR_TIMEOUT);
 663        parport_epilogue(pp);
 664        if (retval) {
 665                dev_err(&mos_parport->serial->dev->dev,
 666                        "mos7720: usb_bulk_msg() failed: %d\n", retval);
 667                return 0;
 668        }
 669        return actual_len;
 670}
 671
 672static struct parport_operations parport_mos7715_ops = {
 673        .owner =                THIS_MODULE,
 674        .write_data =           parport_mos7715_write_data,
 675        .read_data =            parport_mos7715_read_data,
 676
 677        .write_control =        parport_mos7715_write_control,
 678        .read_control =         parport_mos7715_read_control,
 679        .frob_control =         parport_mos7715_frob_control,
 680
 681        .read_status =          parport_mos7715_read_status,
 682
 683        .enable_irq =           parport_mos7715_enable_irq,
 684        .disable_irq =          parport_mos7715_disable_irq,
 685
 686        .data_forward =         parport_mos7715_data_forward,
 687        .data_reverse =         parport_mos7715_data_reverse,
 688
 689        .init_state =           parport_mos7715_init_state,
 690        .save_state =           parport_mos7715_save_state,
 691        .restore_state =        parport_mos7715_restore_state,
 692
 693        .compat_write_data =    parport_mos7715_write_compat,
 694
 695        .nibble_read_data =     parport_ieee1284_read_nibble,
 696        .byte_read_data =       parport_ieee1284_read_byte,
 697};
 698
 699/*
 700 * Allocate and initialize parallel port control struct, initialize
 701 * the parallel port hardware device, and register with the parport subsystem.
 702 */
 703static int mos7715_parport_init(struct usb_serial *serial)
 704{
 705        struct mos7715_parport *mos_parport;
 706
 707        /* allocate and initialize parallel port control struct */
 708        mos_parport = kzalloc(sizeof(struct mos7715_parport), GFP_KERNEL);
 709        if (!mos_parport)
 710                return -ENOMEM;
 711
 712        mos_parport->msg_pending = false;
 713        kref_init(&mos_parport->ref_count);
 714        spin_lock_init(&mos_parport->listlock);
 715        INIT_LIST_HEAD(&mos_parport->active_urbs);
 716        INIT_LIST_HEAD(&mos_parport->deferred_urbs);
 717        usb_set_serial_data(serial, mos_parport); /* hijack private pointer */
 718        mos_parport->serial = serial;
 719        tasklet_init(&mos_parport->urb_tasklet, send_deferred_urbs,
 720                     (unsigned long) mos_parport);
 721        init_completion(&mos_parport->syncmsg_compl);
 722
 723        /* cycle parallel port reset bit */
 724        write_mos_reg(mos_parport->serial, dummy, MOS7720_PP_REG, (__u8)0x80);
 725        write_mos_reg(mos_parport->serial, dummy, MOS7720_PP_REG, (__u8)0x00);
 726
 727        /* initialize device registers */
 728        mos_parport->shadowDCR = DCR_INIT_VAL;
 729        write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
 730                      mos_parport->shadowDCR);
 731        mos_parport->shadowECR = ECR_INIT_VAL;
 732        write_mos_reg(mos_parport->serial, dummy, MOS7720_ECR,
 733                      mos_parport->shadowECR);
 734
 735        /* register with parport core */
 736        mos_parport->pp = parport_register_port(0, PARPORT_IRQ_NONE,
 737                                                PARPORT_DMA_NONE,
 738                                                &parport_mos7715_ops);
 739        if (mos_parport->pp == NULL) {
 740                dev_err(&serial->interface->dev,
 741                        "Could not register parport\n");
 742                kref_put(&mos_parport->ref_count, destroy_mos_parport);
 743                return -EIO;
 744        }
 745        mos_parport->pp->private_data = mos_parport;
 746        mos_parport->pp->modes = PARPORT_MODE_COMPAT | PARPORT_MODE_PCSPP;
 747        mos_parport->pp->dev = &serial->interface->dev;
 748        parport_announce_port(mos_parport->pp);
 749
 750        return 0;
 751}
 752#endif  /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
 753
 754/*
 755 * mos7720_interrupt_callback
 756 *      this is the callback function for when we have received data on the
 757 *      interrupt endpoint.
 758 */
 759static void mos7720_interrupt_callback(struct urb *urb)
 760{
 761        int result;
 762        int length;
 763        int status = urb->status;
 764        struct device *dev = &urb->dev->dev;
 765        __u8 *data;
 766        __u8 sp1;
 767        __u8 sp2;
 768
 769        switch (status) {
 770        case 0:
 771                /* success */
 772                break;
 773        case -ECONNRESET:
 774        case -ENOENT:
 775        case -ESHUTDOWN:
 776                /* this urb is terminated, clean up */
 777                dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
 778                return;
 779        default:
 780                dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
 781                goto exit;
 782        }
 783
 784        length = urb->actual_length;
 785        data = urb->transfer_buffer;
 786
 787        /* Moschip get 4 bytes
 788         * Byte 1 IIR Port 1 (port.number is 0)
 789         * Byte 2 IIR Port 2 (port.number is 1)
 790         * Byte 3 --------------
 791         * Byte 4 FIFO status for both */
 792
 793        /* the above description is inverted
 794         *      oneukum 2007-03-14 */
 795
 796        if (unlikely(length != 4)) {
 797                dev_dbg(dev, "Wrong data !!!\n");
 798                return;
 799        }
 800
 801        sp1 = data[3];
 802        sp2 = data[2];
 803
 804        if ((sp1 | sp2) & 0x01) {
 805                /* No Interrupt Pending in both the ports */
 806                dev_dbg(dev, "No Interrupt !!!\n");
 807        } else {
 808                switch (sp1 & 0x0f) {
 809                case SERIAL_IIR_RLS:
 810                        dev_dbg(dev, "Serial Port 1: Receiver status error or address bit detected in 9-bit mode\n");
 811                        break;
 812                case SERIAL_IIR_CTI:
 813                        dev_dbg(dev, "Serial Port 1: Receiver time out\n");
 814                        break;
 815                case SERIAL_IIR_MS:
 816                        /* dev_dbg(dev, "Serial Port 1: Modem status change\n"); */
 817                        break;
 818                }
 819
 820                switch (sp2 & 0x0f) {
 821                case SERIAL_IIR_RLS:
 822                        dev_dbg(dev, "Serial Port 2: Receiver status error or address bit detected in 9-bit mode\n");
 823                        break;
 824                case SERIAL_IIR_CTI:
 825                        dev_dbg(dev, "Serial Port 2: Receiver time out\n");
 826                        break;
 827                case SERIAL_IIR_MS:
 828                        /* dev_dbg(dev, "Serial Port 2: Modem status change\n"); */
 829                        break;
 830                }
 831        }
 832
 833exit:
 834        result = usb_submit_urb(urb, GFP_ATOMIC);
 835        if (result)
 836                dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result);
 837}
 838
 839/*
 840 * mos7715_interrupt_callback
 841 *      this is the 7715's callback function for when we have received data on
 842 *      the interrupt endpoint.
 843 */
 844static void mos7715_interrupt_callback(struct urb *urb)
 845{
 846        int result;
 847        int length;
 848        int status = urb->status;
 849        struct device *dev = &urb->dev->dev;
 850        __u8 *data;
 851        __u8 iir;
 852
 853        switch (status) {
 854        case 0:
 855                /* success */
 856                break;
 857        case -ECONNRESET:
 858        case -ENOENT:
 859        case -ESHUTDOWN:
 860        case -ENODEV:
 861                /* this urb is terminated, clean up */
 862                dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
 863                return;
 864        default:
 865                dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
 866                goto exit;
 867        }
 868
 869        length = urb->actual_length;
 870        data = urb->transfer_buffer;
 871
 872        /* Structure of data from 7715 device:
 873         * Byte 1: IIR serial Port
 874         * Byte 2: unused
 875         * Byte 2: DSR parallel port
 876         * Byte 4: FIFO status for both */
 877
 878        if (unlikely(length != 4)) {
 879                dev_dbg(dev, "Wrong data !!!\n");
 880                return;
 881        }
 882
 883        iir = data[0];
 884        if (!(iir & 0x01)) {    /* serial port interrupt pending */
 885                switch (iir & 0x0f) {
 886                case SERIAL_IIR_RLS:
 887                        dev_dbg(dev, "Serial Port: Receiver status error or address bit detected in 9-bit mode\n");
 888                        break;
 889                case SERIAL_IIR_CTI:
 890                        dev_dbg(dev, "Serial Port: Receiver time out\n");
 891                        break;
 892                case SERIAL_IIR_MS:
 893                        /* dev_dbg(dev, "Serial Port: Modem status change\n"); */
 894                        break;
 895                }
 896        }
 897
 898#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
 899        {       /* update local copy of DSR reg */
 900                struct usb_serial_port *port = urb->context;
 901                struct mos7715_parport *mos_parport = port->serial->private;
 902                if (unlikely(mos_parport == NULL))
 903                        return;
 904                atomic_set(&mos_parport->shadowDSR, data[2]);
 905        }
 906#endif
 907
 908exit:
 909        result = usb_submit_urb(urb, GFP_ATOMIC);
 910        if (result)
 911                dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result);
 912}
 913
 914/*
 915 * mos7720_bulk_in_callback
 916 *      this is the callback function for when we have received data on the
 917 *      bulk in endpoint.
 918 */
 919static void mos7720_bulk_in_callback(struct urb *urb)
 920{
 921        int retval;
 922        unsigned char *data ;
 923        struct usb_serial_port *port;
 924        int status = urb->status;
 925
 926        if (status) {
 927                dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
 928                return;
 929        }
 930
 931        port = urb->context;
 932
 933        dev_dbg(&port->dev, "Entering...%s\n", __func__);
 934
 935        data = urb->transfer_buffer;
 936
 937        if (urb->actual_length) {
 938                tty_insert_flip_string(&port->port, data, urb->actual_length);
 939                tty_flip_buffer_push(&port->port);
 940        }
 941
 942        if (port->read_urb->status != -EINPROGRESS) {
 943                retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 944                if (retval)
 945                        dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
 946        }
 947}
 948
 949/*
 950 * mos7720_bulk_out_data_callback
 951 *      this is the callback function for when we have finished sending serial
 952 *      data on the bulk out endpoint.
 953 */
 954static void mos7720_bulk_out_data_callback(struct urb *urb)
 955{
 956        struct moschip_port *mos7720_port;
 957        int status = urb->status;
 958
 959        if (status) {
 960                dev_dbg(&urb->dev->dev, "nonzero write bulk status received:%d\n", status);
 961                return;
 962        }
 963
 964        mos7720_port = urb->context;
 965        if (!mos7720_port) {
 966                dev_dbg(&urb->dev->dev, "NULL mos7720_port pointer\n");
 967                return ;
 968        }
 969
 970        if (mos7720_port->open)
 971                tty_port_tty_wakeup(&mos7720_port->port->port);
 972}
 973
 974static int mos77xx_calc_num_ports(struct usb_serial *serial,
 975                                        struct usb_serial_endpoints *epds)
 976{
 977        u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
 978
 979        if (product == MOSCHIP_DEVICE_ID_7715) {
 980                /*
 981                 * The 7715 uses the first bulk in/out endpoint pair for the
 982                 * parallel port, and the second for the serial port. We swap
 983                 * the endpoint descriptors here so that the the first and
 984                 * only registered port structure uses the serial-port
 985                 * endpoints.
 986                 */
 987                swap(epds->bulk_in[0], epds->bulk_in[1]);
 988                swap(epds->bulk_out[0], epds->bulk_out[1]);
 989
 990                return 1;
 991        }
 992
 993        return 2;
 994}
 995
 996static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port)
 997{
 998        struct usb_serial *serial;
 999        struct urb *urb;
1000        struct moschip_port *mos7720_port;
1001        int response;
1002        int port_number;
1003        __u8 data;
1004        int allocated_urbs = 0;
1005        int j;
1006
1007        serial = port->serial;
1008
1009        mos7720_port = usb_get_serial_port_data(port);
1010        if (mos7720_port == NULL)
1011                return -ENODEV;
1012
1013        usb_clear_halt(serial->dev, port->write_urb->pipe);
1014        usb_clear_halt(serial->dev, port->read_urb->pipe);
1015
1016        /* Initialising the write urb pool */
1017        for (j = 0; j < NUM_URBS; ++j) {
1018                urb = usb_alloc_urb(0, GFP_KERNEL);
1019                mos7720_port->write_urb_pool[j] = urb;
1020                if (!urb)
1021                        continue;
1022
1023                urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1024                                               GFP_KERNEL);
1025                if (!urb->transfer_buffer) {
1026                        usb_free_urb(mos7720_port->write_urb_pool[j]);
1027                        mos7720_port->write_urb_pool[j] = NULL;
1028                        continue;
1029                }
1030                allocated_urbs++;
1031        }
1032
1033        if (!allocated_urbs)
1034                return -ENOMEM;
1035
1036         /* Initialize MCS7720 -- Write Init values to corresponding Registers
1037          *
1038          * Register Index
1039          * 0 : MOS7720_THR/MOS7720_RHR
1040          * 1 : MOS7720_IER
1041          * 2 : MOS7720_FCR
1042          * 3 : MOS7720_LCR
1043          * 4 : MOS7720_MCR
1044          * 5 : MOS7720_LSR
1045          * 6 : MOS7720_MSR
1046          * 7 : MOS7720_SPR
1047          *
1048          * 0x08 : SP1/2 Control Reg
1049          */
1050        port_number = port->port_number;
1051        read_mos_reg(serial, port_number, MOS7720_LSR, &data);
1052
1053        dev_dbg(&port->dev, "SS::%p LSR:%x\n", mos7720_port, data);
1054
1055        write_mos_reg(serial, dummy, MOS7720_SP1_REG, 0x02);
1056        write_mos_reg(serial, dummy, MOS7720_SP2_REG, 0x02);
1057
1058        write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
1059        write_mos_reg(serial, port_number, MOS7720_FCR, 0x00);
1060
1061        write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf);
1062        mos7720_port->shadowLCR = 0x03;
1063        write_mos_reg(serial, port_number, MOS7720_LCR,
1064                      mos7720_port->shadowLCR);
1065        mos7720_port->shadowMCR = 0x0b;
1066        write_mos_reg(serial, port_number, MOS7720_MCR,
1067                      mos7720_port->shadowMCR);
1068
1069        write_mos_reg(serial, port_number, MOS7720_SP_CONTROL_REG, 0x00);
1070        read_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, &data);
1071        data = data | (port->port_number + 1);
1072        write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, data);
1073        mos7720_port->shadowLCR = 0x83;
1074        write_mos_reg(serial, port_number, MOS7720_LCR,
1075                      mos7720_port->shadowLCR);
1076        write_mos_reg(serial, port_number, MOS7720_THR, 0x0c);
1077        write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
1078        mos7720_port->shadowLCR = 0x03;
1079        write_mos_reg(serial, port_number, MOS7720_LCR,
1080                      mos7720_port->shadowLCR);
1081        write_mos_reg(serial, port_number, MOS7720_IER, 0x0c);
1082
1083        response = usb_submit_urb(port->read_urb, GFP_KERNEL);
1084        if (response)
1085                dev_err(&port->dev, "%s - Error %d submitting read urb\n",
1086                                                        __func__, response);
1087
1088        /* initialize our port settings */
1089        mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */
1090
1091        /* send a open port command */
1092        mos7720_port->open = 1;
1093
1094        return 0;
1095}
1096
1097/*
1098 * mos7720_chars_in_buffer
1099 *      this function is called by the tty driver when it wants to know how many
1100 *      bytes of data we currently have outstanding in the port (data that has
1101 *      been written, but hasn't made it out the port yet)
1102 *      If successful, we return the number of bytes left to be written in the
1103 *      system,
1104 *      Otherwise we return a negative error number.
1105 */
1106static int mos7720_chars_in_buffer(struct tty_struct *tty)
1107{
1108        struct usb_serial_port *port = tty->driver_data;
1109        int i;
1110        int chars = 0;
1111        struct moschip_port *mos7720_port;
1112
1113        mos7720_port = usb_get_serial_port_data(port);
1114        if (mos7720_port == NULL)
1115                return 0;
1116
1117        for (i = 0; i < NUM_URBS; ++i) {
1118                if (mos7720_port->write_urb_pool[i] &&
1119                    mos7720_port->write_urb_pool[i]->status == -EINPROGRESS)
1120                        chars += URB_TRANSFER_BUFFER_SIZE;
1121        }
1122        dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1123        return chars;
1124}
1125
1126static void mos7720_close(struct usb_serial_port *port)
1127{
1128        struct usb_serial *serial;
1129        struct moschip_port *mos7720_port;
1130        int j;
1131
1132        serial = port->serial;
1133
1134        mos7720_port = usb_get_serial_port_data(port);
1135        if (mos7720_port == NULL)
1136                return;
1137
1138        for (j = 0; j < NUM_URBS; ++j)
1139                usb_kill_urb(mos7720_port->write_urb_pool[j]);
1140
1141        /* Freeing Write URBs */
1142        for (j = 0; j < NUM_URBS; ++j) {
1143                if (mos7720_port->write_urb_pool[j]) {
1144                        kfree(mos7720_port->write_urb_pool[j]->transfer_buffer);
1145                        usb_free_urb(mos7720_port->write_urb_pool[j]);
1146                }
1147        }
1148
1149        /* While closing port, shutdown all bulk read, write  *
1150         * and interrupt read if they exists, otherwise nop   */
1151        usb_kill_urb(port->write_urb);
1152        usb_kill_urb(port->read_urb);
1153
1154        write_mos_reg(serial, port->port_number, MOS7720_MCR, 0x00);
1155        write_mos_reg(serial, port->port_number, MOS7720_IER, 0x00);
1156
1157        mos7720_port->open = 0;
1158}
1159
1160static void mos7720_break(struct tty_struct *tty, int break_state)
1161{
1162        struct usb_serial_port *port = tty->driver_data;
1163        unsigned char data;
1164        struct usb_serial *serial;
1165        struct moschip_port *mos7720_port;
1166
1167        serial = port->serial;
1168
1169        mos7720_port = usb_get_serial_port_data(port);
1170        if (mos7720_port == NULL)
1171                return;
1172
1173        if (break_state == -1)
1174                data = mos7720_port->shadowLCR | UART_LCR_SBC;
1175        else
1176                data = mos7720_port->shadowLCR & ~UART_LCR_SBC;
1177
1178        mos7720_port->shadowLCR  = data;
1179        write_mos_reg(serial, port->port_number, MOS7720_LCR,
1180                      mos7720_port->shadowLCR);
1181}
1182
1183/*
1184 * mos7720_write_room
1185 *      this function is called by the tty driver when it wants to know how many
1186 *      bytes of data we can accept for a specific port.
1187 *      If successful, we return the amount of room that we have for this port
1188 *      Otherwise we return a negative error number.
1189 */
1190static int mos7720_write_room(struct tty_struct *tty)
1191{
1192        struct usb_serial_port *port = tty->driver_data;
1193        struct moschip_port *mos7720_port;
1194        int room = 0;
1195        int i;
1196
1197        mos7720_port = usb_get_serial_port_data(port);
1198        if (mos7720_port == NULL)
1199                return -ENODEV;
1200
1201        /* FIXME: Locking */
1202        for (i = 0; i < NUM_URBS; ++i) {
1203                if (mos7720_port->write_urb_pool[i] &&
1204                    mos7720_port->write_urb_pool[i]->status != -EINPROGRESS)
1205                        room += URB_TRANSFER_BUFFER_SIZE;
1206        }
1207
1208        dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
1209        return room;
1210}
1211
1212static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port,
1213                                 const unsigned char *data, int count)
1214{
1215        int status;
1216        int i;
1217        int bytes_sent = 0;
1218        int transfer_size;
1219
1220        struct moschip_port *mos7720_port;
1221        struct usb_serial *serial;
1222        struct urb    *urb;
1223        const unsigned char *current_position = data;
1224
1225        serial = port->serial;
1226
1227        mos7720_port = usb_get_serial_port_data(port);
1228        if (mos7720_port == NULL)
1229                return -ENODEV;
1230
1231        /* try to find a free urb in the list */
1232        urb = NULL;
1233
1234        for (i = 0; i < NUM_URBS; ++i) {
1235                if (mos7720_port->write_urb_pool[i] &&
1236                    mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) {
1237                        urb = mos7720_port->write_urb_pool[i];
1238                        dev_dbg(&port->dev, "URB:%d\n", i);
1239                        break;
1240                }
1241        }
1242
1243        if (urb == NULL) {
1244                dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1245                goto exit;
1246        }
1247
1248        if (urb->transfer_buffer == NULL) {
1249                urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1250                                               GFP_ATOMIC);
1251                if (!urb->transfer_buffer)
1252                        goto exit;
1253        }
1254        transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1255
1256        memcpy(urb->transfer_buffer, current_position, transfer_size);
1257        usb_serial_debug_data(&port->dev, __func__, transfer_size,
1258                              urb->transfer_buffer);
1259
1260        /* fill urb with data and submit  */
1261        usb_fill_bulk_urb(urb, serial->dev,
1262                          usb_sndbulkpipe(serial->dev,
1263                                        port->bulk_out_endpointAddress),
1264                          urb->transfer_buffer, transfer_size,
1265                          mos7720_bulk_out_data_callback, mos7720_port);
1266
1267        /* send it down the pipe */
1268        status = usb_submit_urb(urb, GFP_ATOMIC);
1269        if (status) {
1270                dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1271                        "with status = %d\n", __func__, status);
1272                bytes_sent = status;
1273                goto exit;
1274        }
1275        bytes_sent = transfer_size;
1276
1277exit:
1278        return bytes_sent;
1279}
1280
1281static void mos7720_throttle(struct tty_struct *tty)
1282{
1283        struct usb_serial_port *port = tty->driver_data;
1284        struct moschip_port *mos7720_port;
1285        int status;
1286
1287        mos7720_port = usb_get_serial_port_data(port);
1288
1289        if (mos7720_port == NULL)
1290                return;
1291
1292        if (!mos7720_port->open) {
1293                dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1294                return;
1295        }
1296
1297        /* if we are implementing XON/XOFF, send the stop character */
1298        if (I_IXOFF(tty)) {
1299                unsigned char stop_char = STOP_CHAR(tty);
1300                status = mos7720_write(tty, port, &stop_char, 1);
1301                if (status <= 0)
1302                        return;
1303        }
1304
1305        /* if we are implementing RTS/CTS, toggle that line */
1306        if (C_CRTSCTS(tty)) {
1307                mos7720_port->shadowMCR &= ~UART_MCR_RTS;
1308                write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
1309                              mos7720_port->shadowMCR);
1310        }
1311}
1312
1313static void mos7720_unthrottle(struct tty_struct *tty)
1314{
1315        struct usb_serial_port *port = tty->driver_data;
1316        struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1317        int status;
1318
1319        if (mos7720_port == NULL)
1320                return;
1321
1322        if (!mos7720_port->open) {
1323                dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1324                return;
1325        }
1326
1327        /* if we are implementing XON/XOFF, send the start character */
1328        if (I_IXOFF(tty)) {
1329                unsigned char start_char = START_CHAR(tty);
1330                status = mos7720_write(tty, port, &start_char, 1);
1331                if (status <= 0)
1332                        return;
1333        }
1334
1335        /* if we are implementing RTS/CTS, toggle that line */
1336        if (C_CRTSCTS(tty)) {
1337                mos7720_port->shadowMCR |= UART_MCR_RTS;
1338                write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
1339                              mos7720_port->shadowMCR);
1340        }
1341}
1342
1343/* FIXME: this function does not work */
1344static int set_higher_rates(struct moschip_port *mos7720_port,
1345                            unsigned int baud)
1346{
1347        struct usb_serial_port *port;
1348        struct usb_serial *serial;
1349        int port_number;
1350        enum mos_regs sp_reg;
1351        if (mos7720_port == NULL)
1352                return -EINVAL;
1353
1354        port = mos7720_port->port;
1355        serial = port->serial;
1356
1357         /***********************************************
1358         *      Init Sequence for higher rates
1359         ***********************************************/
1360        dev_dbg(&port->dev, "Sending Setting Commands ..........\n");
1361        port_number = port->port_number;
1362
1363        write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
1364        write_mos_reg(serial, port_number, MOS7720_FCR, 0x00);
1365        write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf);
1366        mos7720_port->shadowMCR = 0x0b;
1367        write_mos_reg(serial, port_number, MOS7720_MCR,
1368                      mos7720_port->shadowMCR);
1369        write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 0x00);
1370
1371        /***********************************************
1372         *              Set for higher rates           *
1373         ***********************************************/
1374        /* writing baud rate verbatum into uart clock field clearly not right */
1375        if (port_number == 0)
1376                sp_reg = MOS7720_SP1_REG;
1377        else
1378                sp_reg = MOS7720_SP2_REG;
1379        write_mos_reg(serial, dummy, sp_reg, baud * 0x10);
1380        write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 0x03);
1381        mos7720_port->shadowMCR = 0x2b;
1382        write_mos_reg(serial, port_number, MOS7720_MCR,
1383                      mos7720_port->shadowMCR);
1384
1385        /***********************************************
1386         *              Set DLL/DLM
1387         ***********************************************/
1388        mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1389        write_mos_reg(serial, port_number, MOS7720_LCR,
1390                      mos7720_port->shadowLCR);
1391        write_mos_reg(serial, port_number, MOS7720_DLL, 0x01);
1392        write_mos_reg(serial, port_number, MOS7720_DLM, 0x00);
1393        mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1394        write_mos_reg(serial, port_number, MOS7720_LCR,
1395                      mos7720_port->shadowLCR);
1396
1397        return 0;
1398}
1399
1400/* baud rate information */
1401struct divisor_table_entry {
1402        __u32  baudrate;
1403        __u16  divisor;
1404};
1405
1406/* Define table of divisors for moschip 7720 hardware      *
1407 * These assume a 3.6864MHz crystal, the standard /16, and *
1408 * MCR.7 = 0.                                              */
1409static const struct divisor_table_entry divisor_table[] = {
1410        {   50,         2304},
1411        {   110,        1047},  /* 2094.545455 => 230450   => .0217 % over */
1412        {   134,        857},   /* 1713.011152 => 230398.5 => .00065% under */
1413        {   150,        768},
1414        {   300,        384},
1415        {   600,        192},
1416        {   1200,       96},
1417        {   1800,       64},
1418        {   2400,       48},
1419        {   4800,       24},
1420        {   7200,       16},
1421        {   9600,       12},
1422        {   19200,      6},
1423        {   38400,      3},
1424        {   57600,      2},
1425        {   115200,     1},
1426};
1427
1428/*****************************************************************************
1429 * calc_baud_rate_divisor
1430 *      this function calculates the proper baud rate divisor for the specified
1431 *      baud rate.
1432 *****************************************************************************/
1433static int calc_baud_rate_divisor(struct usb_serial_port *port, int baudrate, int *divisor)
1434{
1435        int i;
1436        __u16 custom;
1437        __u16 round1;
1438        __u16 round;
1439
1440
1441        dev_dbg(&port->dev, "%s - %d\n", __func__, baudrate);
1442
1443        for (i = 0; i < ARRAY_SIZE(divisor_table); i++) {
1444                if (divisor_table[i].baudrate == baudrate) {
1445                        *divisor = divisor_table[i].divisor;
1446                        return 0;
1447                }
1448        }
1449
1450        /* After trying for all the standard baud rates    *
1451         * Try calculating the divisor for this baud rate  */
1452        if (baudrate > 75 &&  baudrate < 230400) {
1453                /* get the divisor */
1454                custom = (__u16)(230400L  / baudrate);
1455
1456                /* Check for round off */
1457                round1 = (__u16)(2304000L / baudrate);
1458                round = (__u16)(round1 - (custom * 10));
1459                if (round > 4)
1460                        custom++;
1461                *divisor = custom;
1462
1463                dev_dbg(&port->dev, "Baud %d = %d\n", baudrate, custom);
1464                return 0;
1465        }
1466
1467        dev_dbg(&port->dev, "Baud calculation Failed...\n");
1468        return -EINVAL;
1469}
1470
1471/*
1472 * send_cmd_write_baud_rate
1473 *      this function sends the proper command to change the baud rate of the
1474 *      specified port.
1475 */
1476static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port,
1477                                    int baudrate)
1478{
1479        struct usb_serial_port *port;
1480        struct usb_serial *serial;
1481        int divisor;
1482        int status;
1483        unsigned char number;
1484
1485        if (mos7720_port == NULL)
1486                return -1;
1487
1488        port = mos7720_port->port;
1489        serial = port->serial;
1490
1491        number = port->port_number;
1492        dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudrate);
1493
1494        /* Calculate the Divisor */
1495        status = calc_baud_rate_divisor(port, baudrate, &divisor);
1496        if (status) {
1497                dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1498                return status;
1499        }
1500
1501        /* Enable access to divisor latch */
1502        mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1503        write_mos_reg(serial, number, MOS7720_LCR, mos7720_port->shadowLCR);
1504
1505        /* Write the divisor */
1506        write_mos_reg(serial, number, MOS7720_DLL, (__u8)(divisor & 0xff));
1507        write_mos_reg(serial, number, MOS7720_DLM,
1508                      (__u8)((divisor & 0xff00) >> 8));
1509
1510        /* Disable access to divisor latch */
1511        mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1512        write_mos_reg(serial, number, MOS7720_LCR, mos7720_port->shadowLCR);
1513
1514        return status;
1515}
1516
1517/*
1518 * change_port_settings
1519 *      This routine is called to set the UART on the device to match
1520 *      the specified new settings.
1521 */
1522static void change_port_settings(struct tty_struct *tty,
1523                                 struct moschip_port *mos7720_port,
1524                                 struct ktermios *old_termios)
1525{
1526        struct usb_serial_port *port;
1527        struct usb_serial *serial;
1528        int baud;
1529        unsigned cflag;
1530        __u8 lData;
1531        __u8 lParity;
1532        __u8 lStop;
1533        int status;
1534        int port_number;
1535
1536        if (mos7720_port == NULL)
1537                return ;
1538
1539        port = mos7720_port->port;
1540        serial = port->serial;
1541        port_number = port->port_number;
1542
1543        if (!mos7720_port->open) {
1544                dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1545                return;
1546        }
1547
1548        lData = UART_LCR_WLEN8;
1549        lStop = 0x00;   /* 1 stop bit */
1550        lParity = 0x00; /* No parity */
1551
1552        cflag = tty->termios.c_cflag;
1553
1554        /* Change the number of bits */
1555        switch (cflag & CSIZE) {
1556        case CS5:
1557                lData = UART_LCR_WLEN5;
1558                break;
1559
1560        case CS6:
1561                lData = UART_LCR_WLEN6;
1562                break;
1563
1564        case CS7:
1565                lData = UART_LCR_WLEN7;
1566                break;
1567        default:
1568        case CS8:
1569                lData = UART_LCR_WLEN8;
1570                break;
1571        }
1572
1573        /* Change the Parity bit */
1574        if (cflag & PARENB) {
1575                if (cflag & PARODD) {
1576                        lParity = UART_LCR_PARITY;
1577                        dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1578                } else {
1579                        lParity = (UART_LCR_EPAR | UART_LCR_PARITY);
1580                        dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1581                }
1582
1583        } else {
1584                dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1585        }
1586
1587        if (cflag & CMSPAR)
1588                lParity = lParity | 0x20;
1589
1590        /* Change the Stop bit */
1591        if (cflag & CSTOPB) {
1592                lStop = UART_LCR_STOP;
1593                dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1594        } else {
1595                lStop = 0x00;
1596                dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1597        }
1598
1599#define LCR_BITS_MASK           0x03    /* Mask for bits/char field */
1600#define LCR_STOP_MASK           0x04    /* Mask for stop bits field */
1601#define LCR_PAR_MASK            0x38    /* Mask for parity field */
1602
1603        /* Update the LCR with the correct value */
1604        mos7720_port->shadowLCR &=
1605                ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1606        mos7720_port->shadowLCR |= (lData | lParity | lStop);
1607
1608
1609        /* Disable Interrupts */
1610        write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
1611        write_mos_reg(serial, port_number, MOS7720_FCR, 0x00);
1612        write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf);
1613
1614        /* Send the updated LCR value to the mos7720 */
1615        write_mos_reg(serial, port_number, MOS7720_LCR,
1616                      mos7720_port->shadowLCR);
1617        mos7720_port->shadowMCR = 0x0b;
1618        write_mos_reg(serial, port_number, MOS7720_MCR,
1619                      mos7720_port->shadowMCR);
1620
1621        /* set up the MCR register and send it to the mos7720 */
1622        mos7720_port->shadowMCR = UART_MCR_OUT2;
1623        if (cflag & CBAUD)
1624                mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS);
1625
1626        if (cflag & CRTSCTS) {
1627                mos7720_port->shadowMCR |= (UART_MCR_XONANY);
1628                /* To set hardware flow control to the specified *
1629                 * serial port, in SP1/2_CONTROL_REG             */
1630                if (port_number)
1631                        write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG,
1632                                      0x01);
1633                else
1634                        write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG,
1635                                      0x02);
1636
1637        } else
1638                mos7720_port->shadowMCR &= ~(UART_MCR_XONANY);
1639
1640        write_mos_reg(serial, port_number, MOS7720_MCR,
1641                      mos7720_port->shadowMCR);
1642
1643        /* Determine divisor based on baud rate */
1644        baud = tty_get_baud_rate(tty);
1645        if (!baud) {
1646                /* pick a default, any default... */
1647                dev_dbg(&port->dev, "Picked default baud...\n");
1648                baud = 9600;
1649        }
1650
1651        if (baud >= 230400) {
1652                set_higher_rates(mos7720_port, baud);
1653                /* Enable Interrupts */
1654                write_mos_reg(serial, port_number, MOS7720_IER, 0x0c);
1655                return;
1656        }
1657
1658        dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1659        status = send_cmd_write_baud_rate(mos7720_port, baud);
1660        /* FIXME: needs to write actual resulting baud back not just
1661           blindly do so */
1662        if (cflag & CBAUD)
1663                tty_encode_baud_rate(tty, baud, baud);
1664        /* Enable Interrupts */
1665        write_mos_reg(serial, port_number, MOS7720_IER, 0x0c);
1666
1667        if (port->read_urb->status != -EINPROGRESS) {
1668                status = usb_submit_urb(port->read_urb, GFP_KERNEL);
1669                if (status)
1670                        dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status);
1671        }
1672}
1673
1674/*
1675 * mos7720_set_termios
1676 *      this function is called by the tty driver when it wants to change the
1677 *      termios structure.
1678 */
1679static void mos7720_set_termios(struct tty_struct *tty,
1680                struct usb_serial_port *port, struct ktermios *old_termios)
1681{
1682        int status;
1683        struct moschip_port *mos7720_port;
1684
1685        mos7720_port = usb_get_serial_port_data(port);
1686
1687        if (mos7720_port == NULL)
1688                return;
1689
1690        if (!mos7720_port->open) {
1691                dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1692                return;
1693        }
1694
1695        /* change the port settings to the new ones specified */
1696        change_port_settings(tty, mos7720_port, old_termios);
1697
1698        if (port->read_urb->status != -EINPROGRESS) {
1699                status = usb_submit_urb(port->read_urb, GFP_KERNEL);
1700                if (status)
1701                        dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status);
1702        }
1703}
1704
1705/*
1706 * get_lsr_info - get line status register info
1707 *
1708 * Purpose: Let user call ioctl() to get info when the UART physically
1709 *          is emptied.  On bus types like RS485, the transmitter must
1710 *          release the bus after transmitting. This must be done when
1711 *          the transmit shift register is empty, not be done when the
1712 *          transmit holding register is empty.  This functionality
1713 *          allows an RS485 driver to be written in user space.
1714 */
1715static int get_lsr_info(struct tty_struct *tty,
1716                struct moschip_port *mos7720_port, unsigned int __user *value)
1717{
1718        struct usb_serial_port *port = tty->driver_data;
1719        unsigned int result = 0;
1720        unsigned char data = 0;
1721        int port_number = port->port_number;
1722        int count;
1723
1724        count = mos7720_chars_in_buffer(tty);
1725        if (count == 0) {
1726                read_mos_reg(port->serial, port_number, MOS7720_LSR, &data);
1727                if ((data & (UART_LSR_TEMT | UART_LSR_THRE))
1728                                        == (UART_LSR_TEMT | UART_LSR_THRE)) {
1729                        dev_dbg(&port->dev, "%s -- Empty\n", __func__);
1730                        result = TIOCSER_TEMT;
1731                }
1732        }
1733        if (copy_to_user(value, &result, sizeof(int)))
1734                return -EFAULT;
1735        return 0;
1736}
1737
1738static int mos7720_tiocmget(struct tty_struct *tty)
1739{
1740        struct usb_serial_port *port = tty->driver_data;
1741        struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1742        unsigned int result = 0;
1743        unsigned int mcr ;
1744        unsigned int msr ;
1745
1746        mcr = mos7720_port->shadowMCR;
1747        msr = mos7720_port->shadowMSR;
1748
1749        result = ((mcr & UART_MCR_DTR)  ? TIOCM_DTR : 0)   /* 0x002 */
1750          | ((mcr & UART_MCR_RTS)   ? TIOCM_RTS : 0)   /* 0x004 */
1751          | ((msr & UART_MSR_CTS)   ? TIOCM_CTS : 0)   /* 0x020 */
1752          | ((msr & UART_MSR_DCD)   ? TIOCM_CAR : 0)   /* 0x040 */
1753          | ((msr & UART_MSR_RI)    ? TIOCM_RI :  0)   /* 0x080 */
1754          | ((msr & UART_MSR_DSR)   ? TIOCM_DSR : 0);  /* 0x100 */
1755
1756        return result;
1757}
1758
1759static int mos7720_tiocmset(struct tty_struct *tty,
1760                            unsigned int set, unsigned int clear)
1761{
1762        struct usb_serial_port *port = tty->driver_data;
1763        struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1764        unsigned int mcr ;
1765
1766        mcr = mos7720_port->shadowMCR;
1767
1768        if (set & TIOCM_RTS)
1769                mcr |= UART_MCR_RTS;
1770        if (set & TIOCM_DTR)
1771                mcr |= UART_MCR_DTR;
1772        if (set & TIOCM_LOOP)
1773                mcr |= UART_MCR_LOOP;
1774
1775        if (clear & TIOCM_RTS)
1776                mcr &= ~UART_MCR_RTS;
1777        if (clear & TIOCM_DTR)
1778                mcr &= ~UART_MCR_DTR;
1779        if (clear & TIOCM_LOOP)
1780                mcr &= ~UART_MCR_LOOP;
1781
1782        mos7720_port->shadowMCR = mcr;
1783        write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
1784                      mos7720_port->shadowMCR);
1785
1786        return 0;
1787}
1788
1789static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd,
1790                          unsigned int __user *value)
1791{
1792        unsigned int mcr;
1793        unsigned int arg;
1794
1795        struct usb_serial_port *port;
1796
1797        if (mos7720_port == NULL)
1798                return -1;
1799
1800        port = (struct usb_serial_port *)mos7720_port->port;
1801        mcr = mos7720_port->shadowMCR;
1802
1803        if (copy_from_user(&arg, value, sizeof(int)))
1804                return -EFAULT;
1805
1806        switch (cmd) {
1807        case TIOCMBIS:
1808                if (arg & TIOCM_RTS)
1809                        mcr |= UART_MCR_RTS;
1810                if (arg & TIOCM_DTR)
1811                        mcr |= UART_MCR_RTS;
1812                if (arg & TIOCM_LOOP)
1813                        mcr |= UART_MCR_LOOP;
1814                break;
1815
1816        case TIOCMBIC:
1817                if (arg & TIOCM_RTS)
1818                        mcr &= ~UART_MCR_RTS;
1819                if (arg & TIOCM_DTR)
1820                        mcr &= ~UART_MCR_RTS;
1821                if (arg & TIOCM_LOOP)
1822                        mcr &= ~UART_MCR_LOOP;
1823                break;
1824
1825        }
1826
1827        mos7720_port->shadowMCR = mcr;
1828        write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
1829                      mos7720_port->shadowMCR);
1830
1831        return 0;
1832}
1833
1834static int get_serial_info(struct moschip_port *mos7720_port,
1835                           struct serial_struct __user *retinfo)
1836{
1837        struct serial_struct tmp;
1838
1839        memset(&tmp, 0, sizeof(tmp));
1840
1841        tmp.type                = PORT_16550A;
1842        tmp.line                = mos7720_port->port->minor;
1843        tmp.port                = mos7720_port->port->port_number;
1844        tmp.irq                 = 0;
1845        tmp.xmit_fifo_size      = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1846        tmp.baud_base           = 9600;
1847        tmp.close_delay         = 5*HZ;
1848        tmp.closing_wait        = 30*HZ;
1849
1850        if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1851                return -EFAULT;
1852        return 0;
1853}
1854
1855static int mos7720_ioctl(struct tty_struct *tty,
1856                         unsigned int cmd, unsigned long arg)
1857{
1858        struct usb_serial_port *port = tty->driver_data;
1859        struct moschip_port *mos7720_port;
1860
1861        mos7720_port = usb_get_serial_port_data(port);
1862        if (mos7720_port == NULL)
1863                return -ENODEV;
1864
1865        switch (cmd) {
1866        case TIOCSERGETLSR:
1867                dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
1868                return get_lsr_info(tty, mos7720_port,
1869                                        (unsigned int __user *)arg);
1870
1871        /* FIXME: These should be using the mode methods */
1872        case TIOCMBIS:
1873        case TIOCMBIC:
1874                dev_dbg(&port->dev, "%s TIOCMSET/TIOCMBIC/TIOCMSET\n", __func__);
1875                return set_modem_info(mos7720_port, cmd,
1876                                      (unsigned int __user *)arg);
1877
1878        case TIOCGSERIAL:
1879                dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
1880                return get_serial_info(mos7720_port,
1881                                       (struct serial_struct __user *)arg);
1882        }
1883
1884        return -ENOIOCTLCMD;
1885}
1886
1887static int mos7720_startup(struct usb_serial *serial)
1888{
1889        struct usb_device *dev;
1890        char data;
1891        u16 product;
1892        int ret_val;
1893
1894        product = le16_to_cpu(serial->dev->descriptor.idProduct);
1895        dev = serial->dev;
1896
1897        /* setting configuration feature to one */
1898        usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1899                        (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5000);
1900
1901        if (product == MOSCHIP_DEVICE_ID_7715) {
1902                struct urb *urb = serial->port[0]->interrupt_in_urb;
1903
1904                urb->complete = mos7715_interrupt_callback;
1905
1906#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
1907                ret_val = mos7715_parport_init(serial);
1908                if (ret_val < 0)
1909                        return ret_val;
1910#endif
1911        }
1912        /* start the interrupt urb */
1913        ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL);
1914        if (ret_val) {
1915                dev_err(&dev->dev, "failed to submit interrupt urb: %d\n",
1916                        ret_val);
1917        }
1918
1919        /* LSR For Port 1 */
1920        read_mos_reg(serial, 0, MOS7720_LSR, &data);
1921        dev_dbg(&dev->dev, "LSR:%x\n", data);
1922
1923        return 0;
1924}
1925
1926static void mos7720_release(struct usb_serial *serial)
1927{
1928        usb_kill_urb(serial->port[0]->interrupt_in_urb);
1929
1930#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
1931        /* close the parallel port */
1932
1933        if (le16_to_cpu(serial->dev->descriptor.idProduct)
1934            == MOSCHIP_DEVICE_ID_7715) {
1935                struct urbtracker *urbtrack;
1936                unsigned long flags;
1937                struct mos7715_parport *mos_parport =
1938                        usb_get_serial_data(serial);
1939
1940                /* prevent NULL ptr dereference in port callbacks */
1941                spin_lock(&release_lock);
1942                mos_parport->pp->private_data = NULL;
1943                spin_unlock(&release_lock);
1944
1945                /* wait for synchronous usb calls to return */
1946                if (mos_parport->msg_pending)
1947                        wait_for_completion_timeout(&mos_parport->syncmsg_compl,
1948                                            msecs_to_jiffies(MOS_WDR_TIMEOUT));
1949
1950                parport_remove_port(mos_parport->pp);
1951                usb_set_serial_data(serial, NULL);
1952                mos_parport->serial = NULL;
1953
1954                /* if tasklet currently scheduled, wait for it to complete */
1955                tasklet_kill(&mos_parport->urb_tasklet);
1956
1957                /* unlink any urbs sent by the tasklet  */
1958                spin_lock_irqsave(&mos_parport->listlock, flags);
1959                list_for_each_entry(urbtrack,
1960                                    &mos_parport->active_urbs,
1961                                    urblist_entry)
1962                        usb_unlink_urb(urbtrack->urb);
1963                spin_unlock_irqrestore(&mos_parport->listlock, flags);
1964                parport_del_port(mos_parport->pp);
1965
1966                kref_put(&mos_parport->ref_count, destroy_mos_parport);
1967        }
1968#endif
1969}
1970
1971static int mos7720_port_probe(struct usb_serial_port *port)
1972{
1973        struct moschip_port *mos7720_port;
1974
1975        mos7720_port = kzalloc(sizeof(*mos7720_port), GFP_KERNEL);
1976        if (!mos7720_port)
1977                return -ENOMEM;
1978
1979        mos7720_port->port = port;
1980
1981        usb_set_serial_port_data(port, mos7720_port);
1982
1983        return 0;
1984}
1985
1986static int mos7720_port_remove(struct usb_serial_port *port)
1987{
1988        struct moschip_port *mos7720_port;
1989
1990        mos7720_port = usb_get_serial_port_data(port);
1991        kfree(mos7720_port);
1992
1993        return 0;
1994}
1995
1996static struct usb_serial_driver moschip7720_2port_driver = {
1997        .driver = {
1998                .owner =        THIS_MODULE,
1999                .name =         "moschip7720",
2000        },
2001        .description            = "Moschip 2 port adapter",
2002        .id_table               = id_table,
2003        .num_bulk_in            = 2,
2004        .num_bulk_out           = 2,
2005        .num_interrupt_in       = 1,
2006        .calc_num_ports         = mos77xx_calc_num_ports,
2007        .open                   = mos7720_open,
2008        .close                  = mos7720_close,
2009        .throttle               = mos7720_throttle,
2010        .unthrottle             = mos7720_unthrottle,
2011        .attach                 = mos7720_startup,
2012        .release                = mos7720_release,
2013        .port_probe             = mos7720_port_probe,
2014        .port_remove            = mos7720_port_remove,
2015        .ioctl                  = mos7720_ioctl,
2016        .tiocmget               = mos7720_tiocmget,
2017        .tiocmset               = mos7720_tiocmset,
2018        .set_termios            = mos7720_set_termios,
2019        .write                  = mos7720_write,
2020        .write_room             = mos7720_write_room,
2021        .chars_in_buffer        = mos7720_chars_in_buffer,
2022        .break_ctl              = mos7720_break,
2023        .read_bulk_callback     = mos7720_bulk_in_callback,
2024        .read_int_callback      = mos7720_interrupt_callback,
2025};
2026
2027static struct usb_serial_driver * const serial_drivers[] = {
2028        &moschip7720_2port_driver, NULL
2029};
2030
2031module_usb_serial_driver(serial_drivers, id_table);
2032
2033MODULE_AUTHOR(DRIVER_AUTHOR);
2034MODULE_DESCRIPTION(DRIVER_DESC);
2035MODULE_LICENSE("GPL v2");
2036