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	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 */
 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 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
1806static 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
1826static 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
1861static 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
1906static 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
1921static 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
1931static 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
1963static struct usb_serial_driver * const serial_drivers[] = {
1964	&moschip7720_2port_driver, NULL
1965};
1966
1967module_usb_serial_driver(serial_drivers, id_table);
1968
1969MODULE_AUTHOR(DRIVER_AUTHOR);
1970MODULE_DESCRIPTION(DRIVER_DESC);
1971MODULE_LICENSE("GPL v2");