drivers/usb/serial/mos7720.c

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This source file includes following definitions.
get_reg_index
get_reg_value
write_mos_reg
read_mos_reg
mos7715_change_mode
destroy_mos_parport
destroy_urbtracker
send_deferred_urbs
async_complete
write_parport_reg_nonblock
parport_prologue
parport_epilogue
parport_mos7715_write_data
parport_mos7715_read_data
parport_mos7715_write_control
parport_mos7715_read_control
parport_mos7715_frob_control
parport_mos7715_read_status
parport_mos7715_enable_irq
parport_mos7715_disable_irq
parport_mos7715_data_forward
parport_mos7715_data_reverse
parport_mos7715_init_state
parport_mos7715_save_state
parport_mos7715_restore_state
parport_mos7715_write_compat
mos7715_parport_init
mos7720_interrupt_callback
mos7715_interrupt_callback
mos7720_bulk_in_callback
mos7720_bulk_out_data_callback
mos77xx_calc_num_ports
mos7720_open
mos7720_chars_in_buffer
mos7720_close
mos7720_break
mos7720_write_room
mos7720_write
mos7720_throttle
mos7720_unthrottle
set_higher_rates
calc_baud_rate_divisor
send_cmd_write_baud_rate
change_port_settings
mos7720_set_termios
get_lsr_info
mos7720_tiocmget
mos7720_tiocmset
get_serial_info
mos7720_ioctl
mos7720_startup
mos7720_release
mos7720_port_probe
mos7720_port_remove
   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 */
  56 struct 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 
  69 static 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 };
  74 MODULE_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 
  82 struct 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 
  90 enum 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 
  96 struct 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 */
 112 static DEFINE_SPINLOCK(release_lock);
 113 
 114 #endif  /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
 115 
 116 static const unsigned int dummy; /* for clarity in register access fns */
 117 
 118 enum 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  */
 145 static 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  */
 176 static 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  */
 194 static 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  */
 216 static 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 
 251 static 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 
 260 static 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 
 268 static 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  */
 285 static 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 */
 339 static 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 
 355 static 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         urbtrack->urb = usb_alloc_urb(0, GFP_ATOMIC);
 370         if (!urbtrack->urb) {
 371                 kfree(urbtrack);
 372                 return -ENOMEM;
 373         }
 374         urbtrack->setup = kmalloc(sizeof(*urbtrack->setup), GFP_ATOMIC);
 375         if (!urbtrack->setup) {
 376                 usb_free_urb(urbtrack->urb);
 377                 kfree(urbtrack);
 378                 return -ENOMEM;
 379         }
 380         urbtrack->setup->bRequestType = (__u8)0x40;
 381         urbtrack->setup->bRequest = (__u8)0x0e;
 382         urbtrack->setup->wValue = cpu_to_le16(get_reg_value(reg, dummy));
 383         urbtrack->setup->wIndex = cpu_to_le16(get_reg_index(reg));
 384         urbtrack->setup->wLength = 0;
 385         usb_fill_control_urb(urbtrack->urb, usbdev,
 386                              usb_sndctrlpipe(usbdev, 0),
 387                              (unsigned char *)urbtrack->setup,
 388                              NULL, 0, async_complete, urbtrack);
 389         kref_get(&mos_parport->ref_count);
 390         urbtrack->mos_parport = mos_parport;
 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  */
 445 static 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  */
 476 static 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 
 484 static 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 
 495 static 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 
 507 static 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 
 520 static 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 
 536 static 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 
 555 static 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 
 571 static void parport_mos7715_enable_irq(struct parport *pp)
 572 {
 573 }
 574 
 575 static void parport_mos7715_disable_irq(struct parport *pp)
 576 {
 577 }
 578 
 579 static 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 
 592 static 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 
 605 static 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 */
 613 static 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 */
 630 static 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 
 648 static 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 
 672 static 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  */
 703 static 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  */
 759 static 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 
 833 exit:
 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  */
 844 static 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 
 908 exit:
 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  */
 919 static 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  */
 954 static 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 
 974 static 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 
 996 static 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  */
1106 static 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 
1126 static 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 
1160 static 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  */
1190 static 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 
1212 static 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 
1277 exit:
1278         return bytes_sent;
1279 }
1280 
1281 static 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 
1313 static 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 */
1344 static 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 */
1401 struct 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.                                              */
1409 static 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  *****************************************************************************/
1433 static 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  */
1476 static 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  */
1522 static 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  */
1679 static 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  */
1715 static 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 
1738 static 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 
1759 static 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 
1789 static int get_serial_info(struct tty_struct *tty,
1790                            struct serial_struct *ss)
1791 {
1792         struct usb_serial_port *port = tty->driver_data;
1793         struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1794 
1795         ss->type                = PORT_16550A;
1796         ss->line                = mos7720_port->port->minor;
1797         ss->port                = mos7720_port->port->port_number;
1798         ss->irq                 = 0;
1799         ss->xmit_fifo_size      = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1800         ss->baud_base           = 9600;
1801         ss->close_delay         = 5*HZ;
1802         ss->closing_wait        = 30*HZ;
1803         return 0;
1804 }
1805 
1806 static int mos7720_ioctl(struct tty_struct *tty,
1807                          unsigned int cmd, unsigned long arg)
1808 {
1809         struct usb_serial_port *port = tty->driver_data;
1810         struct moschip_port *mos7720_port;
1811 
1812         mos7720_port = usb_get_serial_port_data(port);
1813         if (mos7720_port == NULL)
1814                 return -ENODEV;
1815 
1816         switch (cmd) {
1817         case TIOCSERGETLSR:
1818                 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
1819                 return get_lsr_info(tty, mos7720_port,
1820                                         (unsigned int __user *)arg);
1821         }
1822 
1823         return -ENOIOCTLCMD;
1824 }
1825 
1826 static int mos7720_startup(struct usb_serial *serial)
1827 {
1828         struct usb_device *dev;
1829         char data;
1830         u16 product;
1831         int ret_val;
1832 
1833         product = le16_to_cpu(serial->dev->descriptor.idProduct);
1834         dev = serial->dev;
1835 
1836         if (product == MOSCHIP_DEVICE_ID_7715) {
1837                 struct urb *urb = serial->port[0]->interrupt_in_urb;
1838 
1839                 urb->complete = mos7715_interrupt_callback;
1840 
1841 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
1842                 ret_val = mos7715_parport_init(serial);
1843                 if (ret_val < 0)
1844                         return ret_val;
1845 #endif
1846         }
1847         /* start the interrupt urb */
1848         ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL);
1849         if (ret_val) {
1850                 dev_err(&dev->dev, "failed to submit interrupt urb: %d\n",
1851                         ret_val);
1852         }
1853 
1854         /* LSR For Port 1 */
1855         read_mos_reg(serial, 0, MOS7720_LSR, &data);
1856         dev_dbg(&dev->dev, "LSR:%x\n", data);
1857 
1858         return 0;
1859 }
1860 
1861 static void mos7720_release(struct usb_serial *serial)
1862 {
1863         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1864 
1865 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
1866         /* close the parallel port */
1867 
1868         if (le16_to_cpu(serial->dev->descriptor.idProduct)
1869             == MOSCHIP_DEVICE_ID_7715) {
1870                 struct urbtracker *urbtrack;
1871                 unsigned long flags;
1872                 struct mos7715_parport *mos_parport =
1873                         usb_get_serial_data(serial);
1874 
1875                 /* prevent NULL ptr dereference in port callbacks */
1876                 spin_lock(&release_lock);
1877                 mos_parport->pp->private_data = NULL;
1878                 spin_unlock(&release_lock);
1879 
1880                 /* wait for synchronous usb calls to return */
1881                 if (mos_parport->msg_pending)
1882                         wait_for_completion_timeout(&mos_parport->syncmsg_compl,
1883                                             msecs_to_jiffies(MOS_WDR_TIMEOUT));
1884 
1885                 parport_remove_port(mos_parport->pp);
1886                 usb_set_serial_data(serial, NULL);
1887                 mos_parport->serial = NULL;
1888 
1889                 /* if tasklet currently scheduled, wait for it to complete */
1890                 tasklet_kill(&mos_parport->urb_tasklet);
1891 
1892                 /* unlink any urbs sent by the tasklet  */
1893                 spin_lock_irqsave(&mos_parport->listlock, flags);
1894                 list_for_each_entry(urbtrack,
1895                                     &mos_parport->active_urbs,
1896                                     urblist_entry)
1897                         usb_unlink_urb(urbtrack->urb);
1898                 spin_unlock_irqrestore(&mos_parport->listlock, flags);
1899                 parport_del_port(mos_parport->pp);
1900 
1901                 kref_put(&mos_parport->ref_count, destroy_mos_parport);
1902         }
1903 #endif
1904 }
1905 
1906 static int mos7720_port_probe(struct usb_serial_port *port)
1907 {
1908         struct moschip_port *mos7720_port;
1909 
1910         mos7720_port = kzalloc(sizeof(*mos7720_port), GFP_KERNEL);
1911         if (!mos7720_port)
1912                 return -ENOMEM;
1913 
1914         mos7720_port->port = port;
1915 
1916         usb_set_serial_port_data(port, mos7720_port);
1917 
1918         return 0;
1919 }
1920 
1921 static int mos7720_port_remove(struct usb_serial_port *port)
1922 {
1923         struct moschip_port *mos7720_port;
1924 
1925         mos7720_port = usb_get_serial_port_data(port);
1926         kfree(mos7720_port);
1927 
1928         return 0;
1929 }
1930 
1931 static struct usb_serial_driver moschip7720_2port_driver = {
1932         .driver = {
1933                 .owner =        THIS_MODULE,
1934                 .name =         "moschip7720",
1935         },
1936         .description            = "Moschip 2 port adapter",
1937         .id_table               = id_table,
1938         .num_bulk_in            = 2,
1939         .num_bulk_out           = 2,
1940         .num_interrupt_in       = 1,
1941         .calc_num_ports         = mos77xx_calc_num_ports,
1942         .open                   = mos7720_open,
1943         .close                  = mos7720_close,
1944         .throttle               = mos7720_throttle,
1945         .unthrottle             = mos7720_unthrottle,
1946         .attach                 = mos7720_startup,
1947         .release                = mos7720_release,
1948         .port_probe             = mos7720_port_probe,
1949         .port_remove            = mos7720_port_remove,
1950         .ioctl                  = mos7720_ioctl,
1951         .tiocmget               = mos7720_tiocmget,
1952         .tiocmset               = mos7720_tiocmset,
1953         .get_serial             = get_serial_info,
1954         .set_termios            = mos7720_set_termios,
1955         .write                  = mos7720_write,
1956         .write_room             = mos7720_write_room,
1957         .chars_in_buffer        = mos7720_chars_in_buffer,
1958         .break_ctl              = mos7720_break,
1959         .read_bulk_callback     = mos7720_bulk_in_callback,
1960         .read_int_callback      = mos7720_interrupt_callback,
1961 };
1962 
1963 static struct usb_serial_driver * const serial_drivers[] = {
1964         &moschip7720_2port_driver, NULL
1965 };
1966 
1967 module_usb_serial_driver(serial_drivers, id_table);
1968 
1969 MODULE_AUTHOR(DRIVER_AUTHOR);
1970 MODULE_DESCRIPTION(DRIVER_DESC);
1971 MODULE_LICENSE("GPL v2");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/usb/serial/mos7720.c

DEFINITIONS
