1/*
   2 * mos7720.c
   3 *   Controls the Moschip 7720 usb to dual port serial converter
   4 *
   5 * Copyright 2006 Moschip Semiconductor Tech. Ltd.
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License as published by
   9 * the Free Software Foundation, version 2 of the License.
  10 *
  11 * Developed by:
  12 * 	Vijaya Kumar <vijaykumar.gn@gmail.com>
  13 *	Ajay Kumar <naanuajay@yahoo.com>
  14 *	Gurudeva <ngurudeva@yahoo.com>
  15 *
  16 * Cleaned up from the original by:
  17 *	Greg Kroah-Hartman <gregkh@suse.de>
  18 *
  19 * Originally based on drivers/usb/serial/io_edgeport.c which is:
  20 *	Copyright (C) 2000 Inside Out Networks, All rights reserved.
  21 *	Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
  22 */
  23#include <linux/kernel.h>
  24#include <linux/errno.h>
  25#include <linux/slab.h>
  26#include <linux/tty.h>
  27#include <linux/tty_driver.h>
  28#include <linux/tty_flip.h>
  29#include <linux/module.h>
  30#include <linux/spinlock.h>
  31#include <linux/serial.h>
  32#include <linux/serial_reg.h>
  33#include <linux/usb.h>
  34#include <linux/usb/serial.h>
  35#include <linux/uaccess.h>
  36#include <linux/parport.h>
  37
  38#define DRIVER_AUTHOR "Aspire Communications pvt Ltd."
  39#define DRIVER_DESC "Moschip USB Serial Driver"
  40
  41/* default urb timeout */
  42#define MOS_WDR_TIMEOUT	5000
  43
  44#define MOS_MAX_PORT	0x02
  45#define MOS_WRITE	0x0E
  46#define MOS_READ	0x0D
  47
  48/* Interrupt Routines Defines	*/
  49#define SERIAL_IIR_RLS	0x06
  50#define SERIAL_IIR_RDA	0x04
  51#define SERIAL_IIR_CTI	0x0c
  52#define SERIAL_IIR_THR	0x02
  53#define SERIAL_IIR_MS	0x00
  54
  55#define NUM_URBS			16	/* URB Count */
  56#define URB_TRANSFER_BUFFER_SIZE	32	/* URB Size */
  57
  58/* This structure holds all of the local serial port information */
  59struct moschip_port {
  60	__u8	shadowLCR;		/* last LCR value received */
  61	__u8	shadowMCR;		/* last MCR value received */
  62	__u8	shadowMSR;		/* last MSR value received */
  63	char			open;
  64	struct usb_serial_port	*port;	/* loop back to the owner */
  65	struct urb		*write_urb_pool[NUM_URBS];
  66};
  67
  68static struct usb_serial_driver moschip7720_2port_driver;
  69
  70#define USB_VENDOR_ID_MOSCHIP		0x9710
  71#define MOSCHIP_DEVICE_ID_7720		0x7720
  72#define MOSCHIP_DEVICE_ID_7715		0x7715
  73
  74static const struct usb_device_id id_table[] = {
  75	{ USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7720) },
  76	{ USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7715) },
  77	{ } /* terminating entry */
  78};
  79MODULE_DEVICE_TABLE(usb, id_table);
  80
  81#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
  82
  83/* initial values for parport regs */
  84#define DCR_INIT_VAL       0x0c	/* SLCTIN, nINIT */
  85#define ECR_INIT_VAL       0x00	/* SPP mode */
  86
  87struct urbtracker {
  88	struct mos7715_parport  *mos_parport;
  89	struct list_head        urblist_entry;
  90	struct kref             ref_count;
  91	struct urb              *urb;
  92	struct usb_ctrlrequest	*setup;
  93};
  94
  95enum mos7715_pp_modes {
  96	SPP = 0<<5,
  97	PS2 = 1<<5,      /* moschip calls this 'NIBBLE' mode */
  98	PPF = 2<<5,	 /* moschip calls this 'CB-FIFO mode */
  99};
 100
 101struct mos7715_parport {
 102	struct parport          *pp;	       /* back to containing struct */
 103	struct kref             ref_count;     /* to instance of this struct */
 104	struct list_head        deferred_urbs; /* list deferred async urbs */
 105	struct list_head        active_urbs;   /* list async urbs in flight */
 106	spinlock_t              listlock;      /* protects list access */
 107	bool                    msg_pending;   /* usb sync call pending */
 108	struct completion       syncmsg_compl; /* usb sync call completed */
 109	struct tasklet_struct   urb_tasklet;   /* for sending deferred urbs */
 110	struct usb_serial       *serial;       /* back to containing struct */
 111	__u8	                shadowECR;     /* parallel port regs... */
 112	__u8	                shadowDCR;
 113	atomic_t                shadowDSR;     /* updated in int-in callback */
 114};
 115
 116/* lock guards against dereferencing NULL ptr in parport ops callbacks */
 117static DEFINE_SPINLOCK(release_lock);
 118
 119#endif	/* CONFIG_USB_SERIAL_MOS7715_PARPORT */
 120
 121static const unsigned int dummy; /* for clarity in register access fns */
 122
 123enum mos_regs {
 124	MOS7720_THR,		  /* serial port regs */
 125	MOS7720_RHR,
 126	MOS7720_IER,
 127	MOS7720_FCR,
 128	MOS7720_ISR,
 129	MOS7720_LCR,
 130	MOS7720_MCR,
 131	MOS7720_LSR,
 132	MOS7720_MSR,
 133	MOS7720_SPR,
 134	MOS7720_DLL,
 135	MOS7720_DLM,
 136	MOS7720_DPR,		  /* parallel port regs */
 137	MOS7720_DSR,
 138	MOS7720_DCR,
 139	MOS7720_ECR,
 140	MOS7720_SP1_REG,	  /* device control regs */
 141	MOS7720_SP2_REG,	  /* serial port 2 (7720 only) */
 142	MOS7720_PP_REG,
 143	MOS7720_SP_CONTROL_REG,
 144};
 145
 146/*
 147 * Return the correct value for the Windex field of the setup packet
 148 * for a control endpoint message.  See the 7715 datasheet.
 149 */
 150static inline __u16 get_reg_index(enum mos_regs reg)
 151{
 152	static const __u16 mos7715_index_lookup_table[] = {
 153		0x00,		/* MOS7720_THR */
 154		0x00,		/* MOS7720_RHR */
 155		0x01,		/* MOS7720_IER */
 156		0x02,		/* MOS7720_FCR */
 157		0x02,		/* MOS7720_ISR */
 158		0x03,		/* MOS7720_LCR */
 159		0x04,		/* MOS7720_MCR */
 160		0x05,		/* MOS7720_LSR */
 161		0x06,		/* MOS7720_MSR */
 162		0x07,		/* MOS7720_SPR */
 163		0x00,		/* MOS7720_DLL */
 164		0x01,		/* MOS7720_DLM */
 165		0x00,		/* MOS7720_DPR */
 166		0x01,		/* MOS7720_DSR */
 167		0x02,		/* MOS7720_DCR */
 168		0x0a,		/* MOS7720_ECR */
 169		0x01,		/* MOS7720_SP1_REG */
 170		0x02,		/* MOS7720_SP2_REG (7720 only) */
 171		0x04,		/* MOS7720_PP_REG (7715 only) */
 172		0x08,		/* MOS7720_SP_CONTROL_REG */
 173	};
 174	return mos7715_index_lookup_table[reg];
 175}
 176
 177/*
 178 * Return the correct value for the upper byte of the Wvalue field of
 179 * the setup packet for a control endpoint message.
 180 */
 181static inline __u16 get_reg_value(enum mos_regs reg,
 182				  unsigned int serial_portnum)
 183{
 184	if (reg >= MOS7720_SP1_REG)	/* control reg */
 185		return 0x0000;
 186
 187	else if (reg >= MOS7720_DPR)	/* parallel port reg (7715 only) */
 188		return 0x0100;
 189
 190	else			      /* serial port reg */
 191		return (serial_portnum + 2) << 8;
 192}
 193
 194/*
 195 * Write data byte to the specified device register.  The data is embedded in
 196 * the value field of the setup packet. serial_portnum is ignored for registers
 197 * not specific to a particular serial port.
 198 */
 199static int write_mos_reg(struct usb_serial *serial, unsigned int serial_portnum,
 200			 enum mos_regs reg, __u8 data)
 201{
 202	struct usb_device *usbdev = serial->dev;
 203	unsigned int pipe = usb_sndctrlpipe(usbdev, 0);
 204	__u8 request = (__u8)0x0e;
 205	__u8 requesttype = (__u8)0x40;
 206	__u16 index = get_reg_index(reg);
 207	__u16 value = get_reg_value(reg, serial_portnum) + data;
 208	int status = usb_control_msg(usbdev, pipe, request, requesttype, value,
 209				     index, NULL, 0, MOS_WDR_TIMEOUT);
 210	if (status < 0)
 211		dev_err(&usbdev->dev,
 212			"mos7720: usb_control_msg() failed: %d\n", status);
 213	return status;
 214}
 215
 216/*
 217 * Read data byte from the specified device register.  The data returned by the
 218 * device is embedded in the value field of the setup packet.  serial_portnum is
 219 * ignored for registers that are not specific to a particular serial port.
 220 */
 221static int read_mos_reg(struct usb_serial *serial, unsigned int serial_portnum,
 222			enum mos_regs reg, __u8 *data)
 223{
 224	struct usb_device *usbdev = serial->dev;
 225	unsigned int pipe = usb_rcvctrlpipe(usbdev, 0);
 226	__u8 request = (__u8)0x0d;
 227	__u8 requesttype = (__u8)0xc0;
 228	__u16 index = get_reg_index(reg);
 229	__u16 value = get_reg_value(reg, serial_portnum);
 230	u8 *buf;
 231	int status;
 232
 233	buf = kmalloc(1, GFP_KERNEL);
 234	if (!buf)
 235		return -ENOMEM;
 236
 237	status = usb_control_msg(usbdev, pipe, request, requesttype, value,
 238				     index, buf, 1, MOS_WDR_TIMEOUT);
 239	if (status == 1)
 240		*data = *buf;
 241	else if (status < 0)
 242		dev_err(&usbdev->dev,
 243			"mos7720: usb_control_msg() failed: %d\n", status);
 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
 344	if (unlikely(status))
 345		dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n", __func__, status);
 346
 347	/* remove the urbtracker from the active_urbs list */
 348	spin_lock(&urbtrack->mos_parport->listlock);
 349	list_del(&urbtrack->urblist_entry);
 350	spin_unlock(&urbtrack->mos_parport->listlock);
 351	kref_put(&urbtrack->ref_count, destroy_urbtracker);
 352}
 353
 354static int write_parport_reg_nonblock(struct mos7715_parport *mos_parport,
 355				      enum mos_regs reg, __u8 data)
 356{
 357	struct urbtracker *urbtrack;
 358	int ret_val;
 359	unsigned long flags;
 360	struct usb_serial *serial = mos_parport->serial;
 361	struct usb_device *usbdev = serial->dev;
 362
 363	/* create and initialize the control urb and containing urbtracker */
 364	urbtrack = kmalloc(sizeof(struct urbtracker), GFP_ATOMIC);
 365	if (!urbtrack)
 366		return -ENOMEM;
 367
 368	kref_get(&mos_parport->ref_count);
 369	urbtrack->mos_parport = mos_parport;
 370	urbtrack->urb = usb_alloc_urb(0, GFP_ATOMIC);
 371	if (!urbtrack->urb) {
 372		kfree(urbtrack);
 373		return -ENOMEM;
 374	}
 375	urbtrack->setup = kmalloc(sizeof(*urbtrack->setup), GFP_ATOMIC);
 376	if (!urbtrack->setup) {
 377		usb_free_urb(urbtrack->urb);
 378		kfree(urbtrack);
 379		return -ENOMEM;
 380	}
 381	urbtrack->setup->bRequestType = (__u8)0x40;
 382	urbtrack->setup->bRequest = (__u8)0x0e;
 383	urbtrack->setup->wValue = cpu_to_le16(get_reg_value(reg, dummy));
 384	urbtrack->setup->wIndex = cpu_to_le16(get_reg_index(reg));
 385	urbtrack->setup->wLength = 0;
 386	usb_fill_control_urb(urbtrack->urb, usbdev,
 387			     usb_sndctrlpipe(usbdev, 0),
 388			     (unsigned char *)urbtrack->setup,
 389			     NULL, 0, async_complete, urbtrack);
 390	kref_init(&urbtrack->ref_count);
 391	INIT_LIST_HEAD(&urbtrack->urblist_entry);
 392
 393	/*
 394	 * get the disconnect mutex, or add tracker to the deferred_urbs list
 395	 * and schedule a tasklet to try again later
 396	 */
 397	if (!mutex_trylock(&serial->disc_mutex)) {
 398		spin_lock_irqsave(&mos_parport->listlock, flags);
 399		list_add_tail(&urbtrack->urblist_entry,
 400			      &mos_parport->deferred_urbs);
 401		spin_unlock_irqrestore(&mos_parport->listlock, flags);
 402		tasklet_schedule(&mos_parport->urb_tasklet);
 403		dev_dbg(&usbdev->dev, "tasklet scheduled\n");
 404		return 0;
 405	}
 406
 407	/* bail if device disconnected */
 408	if (serial->disconnected) {
 409		kref_put(&urbtrack->ref_count, destroy_urbtracker);
 410		mutex_unlock(&serial->disc_mutex);
 411		return -ENODEV;
 412	}
 413
 414	/* add the tracker to the active_urbs list and submit */
 415	spin_lock_irqsave(&mos_parport->listlock, flags);
 416	list_add_tail(&urbtrack->urblist_entry, &mos_parport->active_urbs);
 417	spin_unlock_irqrestore(&mos_parport->listlock, flags);
 418	ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
 419	mutex_unlock(&serial->disc_mutex);
 420	if (ret_val) {
 421		dev_err(&usbdev->dev,
 422			"%s: submit_urb() failed: %d\n", __func__, ret_val);
 423		spin_lock_irqsave(&mos_parport->listlock, flags);
 424		list_del(&urbtrack->urblist_entry);
 425		spin_unlock_irqrestore(&mos_parport->listlock, flags);
 426		kref_put(&urbtrack->ref_count, destroy_urbtracker);
 427		return ret_val;
 428	}
 429	return 0;
 430}
 431
 432/*
 433 * This is the the common top part of all parallel port callback operations that
 434 * send synchronous messages to the device.  This implements convoluted locking
 435 * that avoids two scenarios: (1) a port operation is called after usbserial
 436 * has called our release function, at which point struct mos7715_parport has
 437 * been destroyed, and (2) the device has been disconnected, but usbserial has
 438 * not called the release function yet because someone has a serial port open.
 439 * The shared release_lock prevents the first, and the mutex and disconnected
 440 * flag maintained by usbserial covers the second.  We also use the msg_pending
 441 * flag to ensure that all synchronous usb message calls have completed before
 442 * our release function can return.
 443 */
 444static int parport_prologue(struct parport *pp)
 445{
 446	struct mos7715_parport *mos_parport;
 447
 448	spin_lock(&release_lock);
 449	mos_parport = pp->private_data;
 450	if (unlikely(mos_parport == NULL)) {
 451		/* release fn called, port struct destroyed */
 452		spin_unlock(&release_lock);
 453		return -1;
 454	}
 455	mos_parport->msg_pending = true;   /* synch usb call pending */
 456	reinit_completion(&mos_parport->syncmsg_compl);
 457	spin_unlock(&release_lock);
 458
 459	mutex_lock(&mos_parport->serial->disc_mutex);
 460	if (mos_parport->serial->disconnected) {
 461		/* device disconnected */
 462		mutex_unlock(&mos_parport->serial->disc_mutex);
 463		mos_parport->msg_pending = false;
 464		complete(&mos_parport->syncmsg_compl);
 465		return -1;
 466	}
 467
 468	return 0;
 469}
 470
 471/*
 472 * This is the common bottom part of all parallel port functions that send
 473 * synchronous messages to the device.
 474 */
 475static inline void parport_epilogue(struct parport *pp)
 476{
 477	struct mos7715_parport *mos_parport = pp->private_data;
 478	mutex_unlock(&mos_parport->serial->disc_mutex);
 479	mos_parport->msg_pending = false;
 480	complete(&mos_parport->syncmsg_compl);
 481}
 482
 483static void parport_mos7715_write_data(struct parport *pp, unsigned char d)
 484{
 485	struct mos7715_parport *mos_parport = pp->private_data;
 486
 487	if (parport_prologue(pp) < 0)
 488		return;
 489	mos7715_change_mode(mos_parport, SPP);
 490	write_mos_reg(mos_parport->serial, dummy, MOS7720_DPR, (__u8)d);
 491	parport_epilogue(pp);
 492}
 493
 494static unsigned char parport_mos7715_read_data(struct parport *pp)
 495{
 496	struct mos7715_parport *mos_parport = pp->private_data;
 497	unsigned char d;
 498
 499	if (parport_prologue(pp) < 0)
 500		return 0;
 501	read_mos_reg(mos_parport->serial, dummy, MOS7720_DPR, &d);
 502	parport_epilogue(pp);
 503	return d;
 504}
 505
 506static void parport_mos7715_write_control(struct parport *pp, unsigned char d)
 507{
 508	struct mos7715_parport *mos_parport = pp->private_data;
 509	__u8 data;
 510
 511	if (parport_prologue(pp) < 0)
 512		return;
 513	data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0);
 514	write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, data);
 515	mos_parport->shadowDCR = data;
 516	parport_epilogue(pp);
 517}
 518
 519static unsigned char parport_mos7715_read_control(struct parport *pp)
 520{
 521	struct mos7715_parport *mos_parport = pp->private_data;
 522	__u8 dcr;
 523
 524	spin_lock(&release_lock);
 525	mos_parport = pp->private_data;
 526	if (unlikely(mos_parport == NULL)) {
 527		spin_unlock(&release_lock);
 528		return 0;
 529	}
 530	dcr = mos_parport->shadowDCR & 0x0f;
 531	spin_unlock(&release_lock);
 532	return dcr;
 533}
 534
 535static unsigned char parport_mos7715_frob_control(struct parport *pp,
 536						  unsigned char mask,
 537						  unsigned char val)
 538{
 539	struct mos7715_parport *mos_parport = pp->private_data;
 540	__u8 dcr;
 541
 542	mask &= 0x0f;
 543	val &= 0x0f;
 544	if (parport_prologue(pp) < 0)
 545		return 0;
 546	mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val;
 547	write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
 548		      mos_parport->shadowDCR);
 549	dcr = mos_parport->shadowDCR & 0x0f;
 550	parport_epilogue(pp);
 551	return dcr;
 552}
 553
 554static unsigned char parport_mos7715_read_status(struct parport *pp)
 555{
 556	unsigned char status;
 557	struct mos7715_parport *mos_parport = pp->private_data;
 558
 559	spin_lock(&release_lock);
 560	mos_parport = pp->private_data;
 561	if (unlikely(mos_parport == NULL)) {	/* release called */
 562		spin_unlock(&release_lock);
 563		return 0;
 564	}
 565	status = atomic_read(&mos_parport->shadowDSR) & 0xf8;
 566	spin_unlock(&release_lock);
 567	return status;
 568}
 569
 570static void parport_mos7715_enable_irq(struct parport *pp)
 571{
 572}
 573
 574static void parport_mos7715_disable_irq(struct parport *pp)
 575{
 576}
 577
 578static void parport_mos7715_data_forward(struct parport *pp)
 579{
 580	struct mos7715_parport *mos_parport = pp->private_data;
 581
 582	if (parport_prologue(pp) < 0)
 583		return;
 584	mos7715_change_mode(mos_parport, PS2);
 585	mos_parport->shadowDCR &=  ~0x20;
 586	write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
 587		      mos_parport->shadowDCR);
 588	parport_epilogue(pp);
 589}
 590
 591static void parport_mos7715_data_reverse(struct parport *pp)
 592{
 593	struct mos7715_parport *mos_parport = pp->private_data;
 594
 595	if (parport_prologue(pp) < 0)
 596		return;
 597	mos7715_change_mode(mos_parport, PS2);
 598	mos_parport->shadowDCR |= 0x20;
 599	write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
 600		      mos_parport->shadowDCR);
 601	parport_epilogue(pp);
 602}
 603
 604static void parport_mos7715_init_state(struct pardevice *dev,
 605				       struct parport_state *s)
 606{
 607	s->u.pc.ctr = DCR_INIT_VAL;
 608	s->u.pc.ecr = ECR_INIT_VAL;
 609}
 610
 611/* N.B. Parport core code requires that this function not block */
 612static void parport_mos7715_save_state(struct parport *pp,
 613				       struct parport_state *s)
 614{
 615	struct mos7715_parport *mos_parport;
 616
 617	spin_lock(&release_lock);
 618	mos_parport = pp->private_data;
 619	if (unlikely(mos_parport == NULL)) {	/* release called */
 620		spin_unlock(&release_lock);
 621		return;
 622	}
 623	s->u.pc.ctr = mos_parport->shadowDCR;
 624	s->u.pc.ecr = mos_parport->shadowECR;
 625	spin_unlock(&release_lock);
 626}
 627
 628/* N.B. Parport core code requires that this function not block */
 629static void parport_mos7715_restore_state(struct parport *pp,
 630					  struct parport_state *s)
 631{
 632	struct mos7715_parport *mos_parport;
 633
 634	spin_lock(&release_lock);
 635	mos_parport = pp->private_data;
 636	if (unlikely(mos_parport == NULL)) {	/* release called */
 637		spin_unlock(&release_lock);
 638		return;
 639	}
 640	write_parport_reg_nonblock(mos_parport, MOS7720_DCR,
 641				   mos_parport->shadowDCR);
 642	write_parport_reg_nonblock(mos_parport, MOS7720_ECR,
 643				   mos_parport->shadowECR);
 644	spin_unlock(&release_lock);
 645}
 646
 647static size_t parport_mos7715_write_compat(struct parport *pp,
 648					   const void *buffer,
 649					   size_t len, int flags)
 650{
 651	int retval;
 652	struct mos7715_parport *mos_parport = pp->private_data;
 653	int actual_len;
 654
 655	if (parport_prologue(pp) < 0)
 656		return 0;
 657	mos7715_change_mode(mos_parport, PPF);
 658	retval = usb_bulk_msg(mos_parport->serial->dev,
 659			      usb_sndbulkpipe(mos_parport->serial->dev, 2),
 660			      (void *)buffer, len, &actual_len,
 661			      MOS_WDR_TIMEOUT);
 662	parport_epilogue(pp);
 663	if (retval) {
 664		dev_err(&mos_parport->serial->dev->dev,
 665			"mos7720: usb_bulk_msg() failed: %d\n", retval);
 666		return 0;
 667	}
 668	return actual_len;
 669}
 670
 671static struct parport_operations parport_mos7715_ops = {
 672	.owner =		THIS_MODULE,
 673	.write_data =		parport_mos7715_write_data,
 674	.read_data =		parport_mos7715_read_data,
 675
 676	.write_control =	parport_mos7715_write_control,
 677	.read_control =		parport_mos7715_read_control,
 678	.frob_control =		parport_mos7715_frob_control,
 679
 680	.read_status =		parport_mos7715_read_status,
 681
 682	.enable_irq =		parport_mos7715_enable_irq,
 683	.disable_irq =		parport_mos7715_disable_irq,
 684
 685	.data_forward =		parport_mos7715_data_forward,
 686	.data_reverse =		parport_mos7715_data_reverse,
 687
 688	.init_state =		parport_mos7715_init_state,
 689	.save_state =		parport_mos7715_save_state,
 690	.restore_state =	parport_mos7715_restore_state,
 691
 692	.compat_write_data =	parport_mos7715_write_compat,
 693
 694	.nibble_read_data =	parport_ieee1284_read_nibble,
 695	.byte_read_data =	parport_ieee1284_read_byte,
 696};
 697
 698/*
 699 * Allocate and initialize parallel port control struct, initialize
 700 * the parallel port hardware device, and register with the parport subsystem.
 701 */
 702static int mos7715_parport_init(struct usb_serial *serial)
 703{
 704	struct mos7715_parport *mos_parport;
 705
 706	/* allocate and initialize parallel port control struct */
 707	mos_parport = kzalloc(sizeof(struct mos7715_parport), GFP_KERNEL);
 708	if (!mos_parport)
 709		return -ENOMEM;
 710
 711	mos_parport->msg_pending = false;
 712	kref_init(&mos_parport->ref_count);
 713	spin_lock_init(&mos_parport->listlock);
 714	INIT_LIST_HEAD(&mos_parport->active_urbs);
 715	INIT_LIST_HEAD(&mos_parport->deferred_urbs);
 716	usb_set_serial_data(serial, mos_parport); /* hijack private pointer */
 717	mos_parport->serial = serial;
 718	tasklet_init(&mos_parport->urb_tasklet, send_deferred_urbs,
 719		     (unsigned long) mos_parport);
 720	init_completion(&mos_parport->syncmsg_compl);
 721
 722	/* cycle parallel port reset bit */
 723	write_mos_reg(mos_parport->serial, dummy, MOS7720_PP_REG, (__u8)0x80);
 724	write_mos_reg(mos_parport->serial, dummy, MOS7720_PP_REG, (__u8)0x00);
 725
 726	/* initialize device registers */
 727	mos_parport->shadowDCR = DCR_INIT_VAL;
 728	write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
 729		      mos_parport->shadowDCR);
 730	mos_parport->shadowECR = ECR_INIT_VAL;
 731	write_mos_reg(mos_parport->serial, dummy, MOS7720_ECR,
 732		      mos_parport->shadowECR);
 733
 734	/* register with parport core */
 735	mos_parport->pp = parport_register_port(0, PARPORT_IRQ_NONE,
 736						PARPORT_DMA_NONE,
 737						&parport_mos7715_ops);
 738	if (mos_parport->pp == NULL) {
 739		dev_err(&serial->interface->dev,
 740			"Could not register parport\n");
 741		kref_put(&mos_parport->ref_count, destroy_mos_parport);
 742		return -EIO;
 743	}
 744	mos_parport->pp->private_data = mos_parport;
 745	mos_parport->pp->modes = PARPORT_MODE_COMPAT | PARPORT_MODE_PCSPP;
 746	mos_parport->pp->dev = &serial->interface->dev;
 747	parport_announce_port(mos_parport->pp);
 748
 749	return 0;
 750}
 751#endif	/* CONFIG_USB_SERIAL_MOS7715_PARPORT */
 752
 753/*
 754 * mos7720_interrupt_callback
 755 *	this is the callback function for when we have received data on the
 756 *	interrupt endpoint.
 757 */
 758static void mos7720_interrupt_callback(struct urb *urb)
 759{
 760	int result;
 761	int length;
 762	int status = urb->status;
 763	struct device *dev = &urb->dev->dev;
 764	__u8 *data;
 765	__u8 sp1;
 766	__u8 sp2;
 767
 768	switch (status) {
 769	case 0:
 770		/* success */
 771		break;
 772	case -ECONNRESET:
 773	case -ENOENT:
 774	case -ESHUTDOWN:
 775		/* this urb is terminated, clean up */
 776		dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
 777		return;
 778	default:
 779		dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
 780		goto exit;
 781	}
 782
 783	length = urb->actual_length;
 784	data = urb->transfer_buffer;
 785
 786	/* Moschip get 4 bytes
 787	 * Byte 1 IIR Port 1 (port.number is 0)
 788	 * Byte 2 IIR Port 2 (port.number is 1)
 789	 * Byte 3 --------------
 790	 * Byte 4 FIFO status for both */
 791
 792	/* the above description is inverted
 793	 * 	oneukum 2007-03-14 */
 794
 795	if (unlikely(length != 4)) {
 796		dev_dbg(dev, "Wrong data !!!\n");
 797		return;
 798	}
 799
 800	sp1 = data[3];
 801	sp2 = data[2];
 802
 803	if ((sp1 | sp2) & 0x01) {
 804		/* No Interrupt Pending in both the ports */
 805		dev_dbg(dev, "No Interrupt !!!\n");
 806	} else {
 807		switch (sp1 & 0x0f) {
 808		case SERIAL_IIR_RLS:
 809			dev_dbg(dev, "Serial Port 1: Receiver status error or address bit detected in 9-bit mode\n");
 810			break;
 811		case SERIAL_IIR_CTI:
 812			dev_dbg(dev, "Serial Port 1: Receiver time out\n");
 813			break;
 814		case SERIAL_IIR_MS:
 815			/* dev_dbg(dev, "Serial Port 1: Modem status change\n"); */
 816			break;
 817		}
 818
 819		switch (sp2 & 0x0f) {
 820		case SERIAL_IIR_RLS:
 821			dev_dbg(dev, "Serial Port 2: Receiver status error or address bit detected in 9-bit mode\n");
 822			break;
 823		case SERIAL_IIR_CTI:
 824			dev_dbg(dev, "Serial Port 2: Receiver time out\n");
 825			break;
 826		case SERIAL_IIR_MS:
 827			/* dev_dbg(dev, "Serial Port 2: Modem status change\n"); */
 828			break;
 829		}
 830	}
 831
 832exit:
 833	result = usb_submit_urb(urb, GFP_ATOMIC);
 834	if (result)
 835		dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result);
 836}
 837
 838/*
 839 * mos7715_interrupt_callback
 840 *	this is the 7715's callback function for when we have received data on
 841 *	the interrupt endpoint.
 842 */
 843static void mos7715_interrupt_callback(struct urb *urb)
 844{
 845	int result;
 846	int length;
 847	int status = urb->status;
 848	struct device *dev = &urb->dev->dev;
 849	__u8 *data;
 850	__u8 iir;
 851
 852	switch (status) {
 853	case 0:
 854		/* success */
 855		break;
 856	case -ECONNRESET:
 857	case -ENOENT:
 858	case -ESHUTDOWN:
 859	case -ENODEV:
 860		/* this urb is terminated, clean up */
 861		dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
 862		return;
 863	default:
 864		dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
 865		goto exit;
 866	}
 867
 868	length = urb->actual_length;
 869	data = urb->transfer_buffer;
 870
 871	/* Structure of data from 7715 device:
 872	 * Byte 1: IIR serial Port
 873	 * Byte 2: unused
 874	 * Byte 2: DSR parallel port
 875	 * Byte 4: FIFO status for both */
 876
 877	if (unlikely(length != 4)) {
 878		dev_dbg(dev, "Wrong data !!!\n");
 879		return;
 880	}
 881
 882	iir = data[0];
 883	if (!(iir & 0x01)) {	/* serial port interrupt pending */
 884		switch (iir & 0x0f) {
 885		case SERIAL_IIR_RLS:
 886			dev_dbg(dev, "Serial Port: Receiver status error or address bit detected in 9-bit mode\n");
 887			break;
 888		case SERIAL_IIR_CTI:
 889			dev_dbg(dev, "Serial Port: Receiver time out\n");
 890			break;
 891		case SERIAL_IIR_MS:
 892			/* dev_dbg(dev, "Serial Port: Modem status change\n"); */
 893			break;
 894		}
 895	}
 896
 897#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
 898	{       /* update local copy of DSR reg */
 899		struct usb_serial_port *port = urb->context;
 900		struct mos7715_parport *mos_parport = port->serial->private;
 901		if (unlikely(mos_parport == NULL))
 902			return;
 903		atomic_set(&mos_parport->shadowDSR, data[2]);
 904	}
 905#endif
 906
 907exit:
 908	result = usb_submit_urb(urb, GFP_ATOMIC);
 909	if (result)
 910		dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result);
 911}
 912
 913/*
 914 * mos7720_bulk_in_callback
 915 *	this is the callback function for when we have received data on the
 916 *	bulk in endpoint.
 917 */
 918static void mos7720_bulk_in_callback(struct urb *urb)
 919{
 920	int retval;
 921	unsigned char *data ;
 922	struct usb_serial_port *port;
 923	int status = urb->status;
 924
 925	if (status) {
 926		dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
 927		return;
 928	}
 929
 930	port = urb->context;
 931
 932	dev_dbg(&port->dev, "Entering...%s\n", __func__);
 933
 934	data = urb->transfer_buffer;
 935
 936	if (urb->actual_length) {
 937		tty_insert_flip_string(&port->port, data, urb->actual_length);
 938		tty_flip_buffer_push(&port->port);
 939	}
 940
 941	if (port->read_urb->status != -EINPROGRESS) {
 942		retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 943		if (retval)
 944			dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
 945	}
 946}
 947
 948/*
 949 * mos7720_bulk_out_data_callback
 950 *	this is the callback function for when we have finished sending serial
 951 *	data on the bulk out endpoint.
 952 */
 953static void mos7720_bulk_out_data_callback(struct urb *urb)
 954{
 955	struct moschip_port *mos7720_port;
 956	int status = urb->status;
 957
 958	if (status) {
 959		dev_dbg(&urb->dev->dev, "nonzero write bulk status received:%d\n", status);
 960		return;
 961	}
 962
 963	mos7720_port = urb->context;
 964	if (!mos7720_port) {
 965		dev_dbg(&urb->dev->dev, "NULL mos7720_port pointer\n");
 966		return ;
 967	}
 968
 969	if (mos7720_port->open)
 970		tty_port_tty_wakeup(&mos7720_port->port->port);
 971}
 972
 973/*
 974 * mos77xx_probe
 975 *	this function installs the appropriate read interrupt endpoint callback
 976 *	depending on whether the device is a 7720 or 7715, thus avoiding costly
 977 *	run-time checks in the high-frequency callback routine itself.
 978 */
 979static int mos77xx_probe(struct usb_serial *serial,
 980			 const struct usb_device_id *id)
 981{
 982	if (id->idProduct == MOSCHIP_DEVICE_ID_7715)
 983		moschip7720_2port_driver.read_int_callback =
 984			mos7715_interrupt_callback;
 985	else
 986		moschip7720_2port_driver.read_int_callback =
 987			mos7720_interrupt_callback;
 988
 989	return 0;
 990}
 991
 992static int mos77xx_calc_num_ports(struct usb_serial *serial)
 993{
 994	u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
 995	if (product == MOSCHIP_DEVICE_ID_7715)
 996		return 1;
 997
 998	return 2;
 999}
1000
1001static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port)
1002{
1003	struct usb_serial *serial;
1004	struct urb *urb;
1005	struct moschip_port *mos7720_port;
1006	int response;
1007	int port_number;
1008	__u8 data;
1009	int allocated_urbs = 0;
1010	int j;
1011
1012	serial = port->serial;
1013
1014	mos7720_port = usb_get_serial_port_data(port);
1015	if (mos7720_port == NULL)
1016		return -ENODEV;
1017
1018	usb_clear_halt(serial->dev, port->write_urb->pipe);
1019	usb_clear_halt(serial->dev, port->read_urb->pipe);
1020
1021	/* Initialising the write urb pool */
1022	for (j = 0; j < NUM_URBS; ++j) {
1023		urb = usb_alloc_urb(0, GFP_KERNEL);
1024		mos7720_port->write_urb_pool[j] = urb;
1025		if (!urb)
1026			continue;
1027
1028		urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1029					       GFP_KERNEL);
1030		if (!urb->transfer_buffer) {
1031			usb_free_urb(mos7720_port->write_urb_pool[j]);
1032			mos7720_port->write_urb_pool[j] = NULL;
1033			continue;
1034		}
1035		allocated_urbs++;
1036	}
1037
1038	if (!allocated_urbs)
1039		return -ENOMEM;
1040
1041	 /* Initialize MCS7720 -- Write Init values to corresponding Registers
1042	  *
1043	  * Register Index
1044	  * 0 : MOS7720_THR/MOS7720_RHR
1045	  * 1 : MOS7720_IER
1046	  * 2 : MOS7720_FCR
1047	  * 3 : MOS7720_LCR
1048	  * 4 : MOS7720_MCR
1049	  * 5 : MOS7720_LSR
1050	  * 6 : MOS7720_MSR
1051	  * 7 : MOS7720_SPR
1052	  *
1053	  * 0x08 : SP1/2 Control Reg
1054	  */
1055	port_number = port->port_number;
1056	read_mos_reg(serial, port_number, MOS7720_LSR, &data);
1057
1058	dev_dbg(&port->dev, "SS::%p LSR:%x\n", mos7720_port, data);
1059
1060	write_mos_reg(serial, dummy, MOS7720_SP1_REG, 0x02);
1061	write_mos_reg(serial, dummy, MOS7720_SP2_REG, 0x02);
1062
1063	write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
1064	write_mos_reg(serial, port_number, MOS7720_FCR, 0x00);
1065
1066	write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf);
1067	mos7720_port->shadowLCR = 0x03;
1068	write_mos_reg(serial, port_number, MOS7720_LCR,
1069		      mos7720_port->shadowLCR);
1070	mos7720_port->shadowMCR = 0x0b;
1071	write_mos_reg(serial, port_number, MOS7720_MCR,
1072		      mos7720_port->shadowMCR);
1073
1074	write_mos_reg(serial, port_number, MOS7720_SP_CONTROL_REG, 0x00);
1075	read_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, &data);
1076	data = data | (port->port_number + 1);
1077	write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, data);
1078	mos7720_port->shadowLCR = 0x83;
1079	write_mos_reg(serial, port_number, MOS7720_LCR,
1080		      mos7720_port->shadowLCR);
1081	write_mos_reg(serial, port_number, MOS7720_THR, 0x0c);
1082	write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
1083	mos7720_port->shadowLCR = 0x03;
1084	write_mos_reg(serial, port_number, MOS7720_LCR,
1085		      mos7720_port->shadowLCR);
1086	write_mos_reg(serial, port_number, MOS7720_IER, 0x0c);
1087
1088	response = usb_submit_urb(port->read_urb, GFP_KERNEL);
1089	if (response)
1090		dev_err(&port->dev, "%s - Error %d submitting read urb\n",
1091							__func__, response);
1092
1093	/* initialize our port settings */
1094	mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */
1095
1096	/* send a open port command */
1097	mos7720_port->open = 1;
1098
1099	return 0;
1100}
1101
1102/*
1103 * mos7720_chars_in_buffer
1104 *	this function is called by the tty driver when it wants to know how many
1105 *	bytes of data we currently have outstanding in the port (data that has
1106 *	been written, but hasn't made it out the port yet)
1107 *	If successful, we return the number of bytes left to be written in the
1108 *	system,
1109 *	Otherwise we return a negative error number.
1110 */
1111static int mos7720_chars_in_buffer(struct tty_struct *tty)
1112{
1113	struct usb_serial_port *port = tty->driver_data;
1114	int i;
1115	int chars = 0;
1116	struct moschip_port *mos7720_port;
1117
1118	mos7720_port = usb_get_serial_port_data(port);
1119	if (mos7720_port == NULL)
1120		return 0;
1121
1122	for (i = 0; i < NUM_URBS; ++i) {
1123		if (mos7720_port->write_urb_pool[i] &&
1124		    mos7720_port->write_urb_pool[i]->status == -EINPROGRESS)
1125			chars += URB_TRANSFER_BUFFER_SIZE;
1126	}
1127	dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1128	return chars;
1129}
1130
1131static void mos7720_close(struct usb_serial_port *port)
1132{
1133	struct usb_serial *serial;
1134	struct moschip_port *mos7720_port;
1135	int j;
1136
1137	serial = port->serial;
1138
1139	mos7720_port = usb_get_serial_port_data(port);
1140	if (mos7720_port == NULL)
1141		return;
1142
1143	for (j = 0; j < NUM_URBS; ++j)
1144		usb_kill_urb(mos7720_port->write_urb_pool[j]);
1145
1146	/* Freeing Write URBs */
1147	for (j = 0; j < NUM_URBS; ++j) {
1148		if (mos7720_port->write_urb_pool[j]) {
1149			kfree(mos7720_port->write_urb_pool[j]->transfer_buffer);
1150			usb_free_urb(mos7720_port->write_urb_pool[j]);
1151		}
1152	}
1153
1154	/* While closing port, shutdown all bulk read, write  *
1155	 * and interrupt read if they exists, otherwise nop   */
1156	usb_kill_urb(port->write_urb);
1157	usb_kill_urb(port->read_urb);
1158
1159	write_mos_reg(serial, port->port_number, MOS7720_MCR, 0x00);
1160	write_mos_reg(serial, port->port_number, MOS7720_IER, 0x00);
1161
1162	mos7720_port->open = 0;
1163}
1164
1165static void mos7720_break(struct tty_struct *tty, int break_state)
1166{
1167	struct usb_serial_port *port = tty->driver_data;
1168	unsigned char data;
1169	struct usb_serial *serial;
1170	struct moschip_port *mos7720_port;
1171
1172	serial = port->serial;
1173
1174	mos7720_port = usb_get_serial_port_data(port);
1175	if (mos7720_port == NULL)
1176		return;
1177
1178	if (break_state == -1)
1179		data = mos7720_port->shadowLCR | UART_LCR_SBC;
1180	else
1181		data = mos7720_port->shadowLCR & ~UART_LCR_SBC;
1182
1183	mos7720_port->shadowLCR  = data;
1184	write_mos_reg(serial, port->port_number, MOS7720_LCR,
1185		      mos7720_port->shadowLCR);
1186}
1187
1188/*
1189 * mos7720_write_room
1190 *	this function is called by the tty driver when it wants to know how many
1191 *	bytes of data we can accept for a specific port.
1192 *	If successful, we return the amount of room that we have for this port
1193 *	Otherwise we return a negative error number.
1194 */
1195static int mos7720_write_room(struct tty_struct *tty)
1196{
1197	struct usb_serial_port *port = tty->driver_data;
1198	struct moschip_port *mos7720_port;
1199	int room = 0;
1200	int i;
1201
1202	mos7720_port = usb_get_serial_port_data(port);
1203	if (mos7720_port == NULL)
1204		return -ENODEV;
1205
1206	/* FIXME: Locking */
1207	for (i = 0; i < NUM_URBS; ++i) {
1208		if (mos7720_port->write_urb_pool[i] &&
1209		    mos7720_port->write_urb_pool[i]->status != -EINPROGRESS)
1210			room += URB_TRANSFER_BUFFER_SIZE;
1211	}
1212
1213	dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
1214	return room;
1215}
1216
1217static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port,
1218				 const unsigned char *data, int count)
1219{
1220	int status;
1221	int i;
1222	int bytes_sent = 0;
1223	int transfer_size;
1224
1225	struct moschip_port *mos7720_port;
1226	struct usb_serial *serial;
1227	struct urb    *urb;
1228	const unsigned char *current_position = data;
1229
1230	serial = port->serial;
1231
1232	mos7720_port = usb_get_serial_port_data(port);
1233	if (mos7720_port == NULL)
1234		return -ENODEV;
1235
1236	/* try to find a free urb in the list */
1237	urb = NULL;
1238
1239	for (i = 0; i < NUM_URBS; ++i) {
1240		if (mos7720_port->write_urb_pool[i] &&
1241		    mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) {
1242			urb = mos7720_port->write_urb_pool[i];
1243			dev_dbg(&port->dev, "URB:%d\n", i);
1244			break;
1245		}
1246	}
1247
1248	if (urb == NULL) {
1249		dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1250		goto exit;
1251	}
1252
1253	if (urb->transfer_buffer == NULL) {
1254		urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1255					       GFP_KERNEL);
1256		if (!urb->transfer_buffer)
1257			goto exit;
1258	}
1259	transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1260
1261	memcpy(urb->transfer_buffer, current_position, transfer_size);
1262	usb_serial_debug_data(&port->dev, __func__, transfer_size,
1263			      urb->transfer_buffer);
1264
1265	/* fill urb with data and submit  */
1266	usb_fill_bulk_urb(urb, serial->dev,
1267			  usb_sndbulkpipe(serial->dev,
1268					port->bulk_out_endpointAddress),
1269			  urb->transfer_buffer, transfer_size,
1270			  mos7720_bulk_out_data_callback, mos7720_port);
1271
1272	/* send it down the pipe */
1273	status = usb_submit_urb(urb, GFP_ATOMIC);
1274	if (status) {
1275		dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1276			"with status = %d\n", __func__, status);
1277		bytes_sent = status;
1278		goto exit;
1279	}
1280	bytes_sent = transfer_size;
1281
1282exit:
1283	return bytes_sent;
1284}
1285
1286static void mos7720_throttle(struct tty_struct *tty)
1287{
1288	struct usb_serial_port *port = tty->driver_data;
1289	struct moschip_port *mos7720_port;
1290	int status;
1291
1292	mos7720_port = usb_get_serial_port_data(port);
1293
1294	if (mos7720_port == NULL)
1295		return;
1296
1297	if (!mos7720_port->open) {
1298		dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1299		return;
1300	}
1301
1302	/* if we are implementing XON/XOFF, send the stop character */
1303	if (I_IXOFF(tty)) {
1304		unsigned char stop_char = STOP_CHAR(tty);
1305		status = mos7720_write(tty, port, &stop_char, 1);
1306		if (status <= 0)
1307			return;
1308	}
1309
1310	/* if we are implementing RTS/CTS, toggle that line */
1311	if (C_CRTSCTS(tty)) {
1312		mos7720_port->shadowMCR &= ~UART_MCR_RTS;
1313		write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
1314			      mos7720_port->shadowMCR);
 
 
1315	}
1316}
1317
1318static void mos7720_unthrottle(struct tty_struct *tty)
1319{
1320	struct usb_serial_port *port = tty->driver_data;
1321	struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1322	int status;
1323
1324	if (mos7720_port == NULL)
1325		return;
1326
1327	if (!mos7720_port->open) {
1328		dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1329		return;
1330	}
1331
1332	/* if we are implementing XON/XOFF, send the start character */
1333	if (I_IXOFF(tty)) {
1334		unsigned char start_char = START_CHAR(tty);
1335		status = mos7720_write(tty, port, &start_char, 1);
1336		if (status <= 0)
1337			return;
1338	}
1339
1340	/* if we are implementing RTS/CTS, toggle that line */
1341	if (C_CRTSCTS(tty)) {
1342		mos7720_port->shadowMCR |= UART_MCR_RTS;
1343		write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
1344			      mos7720_port->shadowMCR);
 
 
1345	}
1346}
1347
1348/* FIXME: this function does not work */
1349static int set_higher_rates(struct moschip_port *mos7720_port,
1350			    unsigned int baud)
1351{
1352	struct usb_serial_port *port;
1353	struct usb_serial *serial;
1354	int port_number;
1355	enum mos_regs sp_reg;
1356	if (mos7720_port == NULL)
1357		return -EINVAL;
1358
1359	port = mos7720_port->port;
1360	serial = port->serial;
1361
1362	 /***********************************************
1363	 *      Init Sequence for higher rates
1364	 ***********************************************/
1365	dev_dbg(&port->dev, "Sending Setting Commands ..........\n");
1366	port_number = port->port_number;
1367
1368	write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
1369	write_mos_reg(serial, port_number, MOS7720_FCR, 0x00);
1370	write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf);
1371	mos7720_port->shadowMCR = 0x0b;
1372	write_mos_reg(serial, port_number, MOS7720_MCR,
1373		      mos7720_port->shadowMCR);
1374	write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 0x00);
1375
1376	/***********************************************
1377	 *              Set for higher rates           *
1378	 ***********************************************/
1379	/* writing baud rate verbatum into uart clock field clearly not right */
1380	if (port_number == 0)
1381		sp_reg = MOS7720_SP1_REG;
1382	else
1383		sp_reg = MOS7720_SP2_REG;
1384	write_mos_reg(serial, dummy, sp_reg, baud * 0x10);
1385	write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 0x03);
1386	mos7720_port->shadowMCR = 0x2b;
1387	write_mos_reg(serial, port_number, MOS7720_MCR,
1388		      mos7720_port->shadowMCR);
1389
1390	/***********************************************
1391	 *              Set DLL/DLM
1392	 ***********************************************/
1393	mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1394	write_mos_reg(serial, port_number, MOS7720_LCR,
1395		      mos7720_port->shadowLCR);
1396	write_mos_reg(serial, port_number, MOS7720_DLL, 0x01);
1397	write_mos_reg(serial, port_number, MOS7720_DLM, 0x00);
1398	mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1399	write_mos_reg(serial, port_number, MOS7720_LCR,
1400		      mos7720_port->shadowLCR);
1401
1402	return 0;
1403}
1404
1405/* baud rate information */
1406struct divisor_table_entry {
1407	__u32  baudrate;
1408	__u16  divisor;
1409};
1410
1411/* Define table of divisors for moschip 7720 hardware	   *
1412 * These assume a 3.6864MHz crystal, the standard /16, and *
1413 * MCR.7 = 0.						   */
1414static struct divisor_table_entry divisor_table[] = {
1415	{   50,		2304},
1416	{   110,	1047},	/* 2094.545455 => 230450   => .0217 % over */
1417	{   134,	857},	/* 1713.011152 => 230398.5 => .00065% under */
1418	{   150,	768},
1419	{   300,	384},
1420	{   600,	192},
1421	{   1200,	96},
1422	{   1800,	64},
1423	{   2400,	48},
1424	{   4800,	24},
1425	{   7200,	16},
1426	{   9600,	12},
1427	{   19200,	6},
1428	{   38400,	3},
1429	{   57600,	2},
1430	{   115200,	1},
1431};
1432
1433/*****************************************************************************
1434 * calc_baud_rate_divisor
1435 *	this function calculates the proper baud rate divisor for the specified
1436 *	baud rate.
1437 *****************************************************************************/
1438static int calc_baud_rate_divisor(struct usb_serial_port *port, int baudrate, int *divisor)
1439{
1440	int i;
1441	__u16 custom;
1442	__u16 round1;
1443	__u16 round;
1444
1445
1446	dev_dbg(&port->dev, "%s - %d\n", __func__, baudrate);
1447
1448	for (i = 0; i < ARRAY_SIZE(divisor_table); i++) {
1449		if (divisor_table[i].baudrate == baudrate) {
1450			*divisor = divisor_table[i].divisor;
1451			return 0;
1452		}
1453	}
1454
1455	/* After trying for all the standard baud rates    *
1456	 * Try calculating the divisor for this baud rate  */
1457	if (baudrate > 75 &&  baudrate < 230400) {
1458		/* get the divisor */
1459		custom = (__u16)(230400L  / baudrate);
1460
1461		/* Check for round off */
1462		round1 = (__u16)(2304000L / baudrate);
1463		round = (__u16)(round1 - (custom * 10));
1464		if (round > 4)
1465			custom++;
1466		*divisor = custom;
1467
1468		dev_dbg(&port->dev, "Baud %d = %d\n", baudrate, custom);
1469		return 0;
1470	}
1471
1472	dev_dbg(&port->dev, "Baud calculation Failed...\n");
1473	return -EINVAL;
1474}
1475
1476/*
1477 * send_cmd_write_baud_rate
1478 *	this function sends the proper command to change the baud rate of the
1479 *	specified port.
1480 */
1481static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port,
1482				    int baudrate)
1483{
1484	struct usb_serial_port *port;
1485	struct usb_serial *serial;
1486	int divisor;
1487	int status;
1488	unsigned char number;
1489
1490	if (mos7720_port == NULL)
1491		return -1;
1492
1493	port = mos7720_port->port;
1494	serial = port->serial;
1495
1496	number = port->port_number;
1497	dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudrate);
1498
1499	/* Calculate the Divisor */
1500	status = calc_baud_rate_divisor(port, baudrate, &divisor);
1501	if (status) {
1502		dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1503		return status;
1504	}
1505
1506	/* Enable access to divisor latch */
1507	mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1508	write_mos_reg(serial, number, MOS7720_LCR, mos7720_port->shadowLCR);
1509
1510	/* Write the divisor */
1511	write_mos_reg(serial, number, MOS7720_DLL, (__u8)(divisor & 0xff));
1512	write_mos_reg(serial, number, MOS7720_DLM,
1513		      (__u8)((divisor & 0xff00) >> 8));
1514
1515	/* Disable access to divisor latch */
1516	mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1517	write_mos_reg(serial, number, MOS7720_LCR, mos7720_port->shadowLCR);
1518
1519	return status;
1520}
1521
1522/*
1523 * change_port_settings
1524 *	This routine is called to set the UART on the device to match
1525 *      the specified new settings.
1526 */
1527static void change_port_settings(struct tty_struct *tty,
1528				 struct moschip_port *mos7720_port,
1529				 struct ktermios *old_termios)
1530{
1531	struct usb_serial_port *port;
1532	struct usb_serial *serial;
1533	int baud;
1534	unsigned cflag;
1535	unsigned iflag;
1536	__u8 mask = 0xff;
1537	__u8 lData;
1538	__u8 lParity;
1539	__u8 lStop;
1540	int status;
1541	int port_number;
1542
1543	if (mos7720_port == NULL)
1544		return ;
1545
1546	port = mos7720_port->port;
1547	serial = port->serial;
1548	port_number = port->port_number;
1549
1550	if (!mos7720_port->open) {
1551		dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1552		return;
1553	}
1554
1555	lData = UART_LCR_WLEN8;
1556	lStop = 0x00;	/* 1 stop bit */
1557	lParity = 0x00;	/* No parity */
1558
1559	cflag = tty->termios.c_cflag;
1560	iflag = tty->termios.c_iflag;
1561
1562	/* Change the number of bits */
1563	switch (cflag & CSIZE) {
1564	case CS5:
1565		lData = UART_LCR_WLEN5;
1566		mask = 0x1f;
1567		break;
1568
1569	case CS6:
1570		lData = UART_LCR_WLEN6;
1571		mask = 0x3f;
1572		break;
1573
1574	case CS7:
1575		lData = UART_LCR_WLEN7;
1576		mask = 0x7f;
1577		break;
1578	default:
1579	case CS8:
1580		lData = UART_LCR_WLEN8;
1581		break;
1582	}
1583
1584	/* Change the Parity bit */
1585	if (cflag & PARENB) {
1586		if (cflag & PARODD) {
1587			lParity = UART_LCR_PARITY;
1588			dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1589		} else {
1590			lParity = (UART_LCR_EPAR | UART_LCR_PARITY);
1591			dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1592		}
1593
1594	} else {
1595		dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1596	}
1597
1598	if (cflag & CMSPAR)
1599		lParity = lParity | 0x20;
1600
1601	/* Change the Stop bit */
1602	if (cflag & CSTOPB) {
1603		lStop = UART_LCR_STOP;
1604		dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1605	} else {
1606		lStop = 0x00;
1607		dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1608	}
1609
1610#define LCR_BITS_MASK		0x03	/* Mask for bits/char field */
1611#define LCR_STOP_MASK		0x04	/* Mask for stop bits field */
1612#define LCR_PAR_MASK		0x38	/* Mask for parity field */
1613
1614	/* Update the LCR with the correct value */
1615	mos7720_port->shadowLCR &=
1616		~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1617	mos7720_port->shadowLCR |= (lData | lParity | lStop);
1618
1619
1620	/* Disable Interrupts */
1621	write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
1622	write_mos_reg(serial, port_number, MOS7720_FCR, 0x00);
1623	write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf);
1624
1625	/* Send the updated LCR value to the mos7720 */
1626	write_mos_reg(serial, port_number, MOS7720_LCR,
1627		      mos7720_port->shadowLCR);
1628	mos7720_port->shadowMCR = 0x0b;
1629	write_mos_reg(serial, port_number, MOS7720_MCR,
1630		      mos7720_port->shadowMCR);
1631
1632	/* set up the MCR register and send it to the mos7720 */
1633	mos7720_port->shadowMCR = UART_MCR_OUT2;
1634	if (cflag & CBAUD)
1635		mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS);
1636
1637	if (cflag & CRTSCTS) {
1638		mos7720_port->shadowMCR |= (UART_MCR_XONANY);
1639		/* To set hardware flow control to the specified *
1640		 * serial port, in SP1/2_CONTROL_REG             */
1641		if (port_number)
1642			write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG,
1643				      0x01);
1644		else
1645			write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG,
1646				      0x02);
1647
1648	} else
1649		mos7720_port->shadowMCR &= ~(UART_MCR_XONANY);
1650
1651	write_mos_reg(serial, port_number, MOS7720_MCR,
1652		      mos7720_port->shadowMCR);
1653
1654	/* Determine divisor based on baud rate */
1655	baud = tty_get_baud_rate(tty);
1656	if (!baud) {
1657		/* pick a default, any default... */
1658		dev_dbg(&port->dev, "Picked default baud...\n");
1659		baud = 9600;
1660	}
1661
1662	if (baud >= 230400) {
1663		set_higher_rates(mos7720_port, baud);
1664		/* Enable Interrupts */
1665		write_mos_reg(serial, port_number, MOS7720_IER, 0x0c);
1666		return;
1667	}
1668
1669	dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1670	status = send_cmd_write_baud_rate(mos7720_port, baud);
1671	/* FIXME: needs to write actual resulting baud back not just
1672	   blindly do so */
1673	if (cflag & CBAUD)
1674		tty_encode_baud_rate(tty, baud, baud);
1675	/* Enable Interrupts */
1676	write_mos_reg(serial, port_number, MOS7720_IER, 0x0c);
1677
1678	if (port->read_urb->status != -EINPROGRESS) {
1679		status = usb_submit_urb(port->read_urb, GFP_KERNEL);
1680		if (status)
1681			dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status);
1682	}
1683}
1684
1685/*
1686 * mos7720_set_termios
1687 *	this function is called by the tty driver when it wants to change the
1688 *	termios structure.
1689 */
1690static void mos7720_set_termios(struct tty_struct *tty,
1691		struct usb_serial_port *port, struct ktermios *old_termios)
1692{
1693	int status;
1694	unsigned int cflag;
1695	struct usb_serial *serial;
1696	struct moschip_port *mos7720_port;
1697
1698	serial = port->serial;
1699
1700	mos7720_port = usb_get_serial_port_data(port);
1701
1702	if (mos7720_port == NULL)
1703		return;
1704
1705	if (!mos7720_port->open) {
1706		dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1707		return;
1708	}
1709
1710	dev_dbg(&port->dev, "setting termios - ASPIRE\n");
1711
1712	cflag = tty->termios.c_cflag;
1713
1714	dev_dbg(&port->dev, "%s - cflag %08x iflag %08x\n", __func__,
1715		tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
1716
1717	dev_dbg(&port->dev, "%s - old cflag %08x old iflag %08x\n", __func__,
1718		old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
1719
1720	/* change the port settings to the new ones specified */
1721	change_port_settings(tty, mos7720_port, old_termios);
1722
1723	if (port->read_urb->status != -EINPROGRESS) {
1724		status = usb_submit_urb(port->read_urb, GFP_KERNEL);
1725		if (status)
1726			dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status);
1727	}
1728}
1729
1730/*
1731 * get_lsr_info - get line status register info
1732 *
1733 * Purpose: Let user call ioctl() to get info when the UART physically
1734 * 	    is emptied.  On bus types like RS485, the transmitter must
1735 * 	    release the bus after transmitting. This must be done when
1736 * 	    the transmit shift register is empty, not be done when the
1737 * 	    transmit holding register is empty.  This functionality
1738 * 	    allows an RS485 driver to be written in user space.
1739 */
1740static int get_lsr_info(struct tty_struct *tty,
1741		struct moschip_port *mos7720_port, unsigned int __user *value)
1742{
1743	struct usb_serial_port *port = tty->driver_data;
1744	unsigned int result = 0;
1745	unsigned char data = 0;
1746	int port_number = port->port_number;
1747	int count;
1748
1749	count = mos7720_chars_in_buffer(tty);
1750	if (count == 0) {
1751		read_mos_reg(port->serial, port_number, MOS7720_LSR, &data);
1752		if ((data & (UART_LSR_TEMT | UART_LSR_THRE))
1753					== (UART_LSR_TEMT | UART_LSR_THRE)) {
1754			dev_dbg(&port->dev, "%s -- Empty\n", __func__);
1755			result = TIOCSER_TEMT;
1756		}
1757	}
1758	if (copy_to_user(value, &result, sizeof(int)))
1759		return -EFAULT;
1760	return 0;
1761}
1762
1763static int mos7720_tiocmget(struct tty_struct *tty)
1764{
1765	struct usb_serial_port *port = tty->driver_data;
1766	struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1767	unsigned int result = 0;
1768	unsigned int mcr ;
1769	unsigned int msr ;
1770
1771	mcr = mos7720_port->shadowMCR;
1772	msr = mos7720_port->shadowMSR;
1773
1774	result = ((mcr & UART_MCR_DTR)  ? TIOCM_DTR : 0)   /* 0x002 */
1775	  | ((mcr & UART_MCR_RTS)   ? TIOCM_RTS : 0)   /* 0x004 */
1776	  | ((msr & UART_MSR_CTS)   ? TIOCM_CTS : 0)   /* 0x020 */
1777	  | ((msr & UART_MSR_DCD)   ? TIOCM_CAR : 0)   /* 0x040 */
1778	  | ((msr & UART_MSR_RI)    ? TIOCM_RI :  0)   /* 0x080 */
1779	  | ((msr & UART_MSR_DSR)   ? TIOCM_DSR : 0);  /* 0x100 */
1780
1781	return result;
1782}
1783
1784static int mos7720_tiocmset(struct tty_struct *tty,
1785			    unsigned int set, unsigned int clear)
1786{
1787	struct usb_serial_port *port = tty->driver_data;
1788	struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1789	unsigned int mcr ;
1790
1791	mcr = mos7720_port->shadowMCR;
1792
1793	if (set & TIOCM_RTS)
1794		mcr |= UART_MCR_RTS;
1795	if (set & TIOCM_DTR)
1796		mcr |= UART_MCR_DTR;
1797	if (set & TIOCM_LOOP)
1798		mcr |= UART_MCR_LOOP;
1799
1800	if (clear & TIOCM_RTS)
1801		mcr &= ~UART_MCR_RTS;
1802	if (clear & TIOCM_DTR)
1803		mcr &= ~UART_MCR_DTR;
1804	if (clear & TIOCM_LOOP)
1805		mcr &= ~UART_MCR_LOOP;
1806
1807	mos7720_port->shadowMCR = mcr;
1808	write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
1809		      mos7720_port->shadowMCR);
1810
1811	return 0;
1812}
1813
1814static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd,
1815			  unsigned int __user *value)
1816{
1817	unsigned int mcr;
1818	unsigned int arg;
1819
1820	struct usb_serial_port *port;
1821
1822	if (mos7720_port == NULL)
1823		return -1;
1824
1825	port = (struct usb_serial_port *)mos7720_port->port;
1826	mcr = mos7720_port->shadowMCR;
1827
1828	if (copy_from_user(&arg, value, sizeof(int)))
1829		return -EFAULT;
1830
1831	switch (cmd) {
1832	case TIOCMBIS:
1833		if (arg & TIOCM_RTS)
1834			mcr |= UART_MCR_RTS;
1835		if (arg & TIOCM_DTR)
1836			mcr |= UART_MCR_RTS;
1837		if (arg & TIOCM_LOOP)
1838			mcr |= UART_MCR_LOOP;
1839		break;
1840
1841	case TIOCMBIC:
1842		if (arg & TIOCM_RTS)
1843			mcr &= ~UART_MCR_RTS;
1844		if (arg & TIOCM_DTR)
1845			mcr &= ~UART_MCR_RTS;
1846		if (arg & TIOCM_LOOP)
1847			mcr &= ~UART_MCR_LOOP;
1848		break;
1849
1850	}
1851
1852	mos7720_port->shadowMCR = mcr;
1853	write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
1854		      mos7720_port->shadowMCR);
1855
1856	return 0;
1857}
1858
1859static int get_serial_info(struct moschip_port *mos7720_port,
1860			   struct serial_struct __user *retinfo)
1861{
1862	struct serial_struct tmp;
1863
1864	if (!retinfo)
1865		return -EFAULT;
1866
1867	memset(&tmp, 0, sizeof(tmp));
1868
1869	tmp.type		= PORT_16550A;
1870	tmp.line		= mos7720_port->port->minor;
1871	tmp.port		= mos7720_port->port->port_number;
1872	tmp.irq			= 0;
1873	tmp.flags		= ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
1874	tmp.xmit_fifo_size	= NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1875	tmp.baud_base		= 9600;
1876	tmp.close_delay		= 5*HZ;
1877	tmp.closing_wait	= 30*HZ;
1878
1879	if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1880		return -EFAULT;
1881	return 0;
1882}
1883
1884static int mos7720_ioctl(struct tty_struct *tty,
1885			 unsigned int cmd, unsigned long arg)
1886{
1887	struct usb_serial_port *port = tty->driver_data;
1888	struct moschip_port *mos7720_port;
1889
1890	mos7720_port = usb_get_serial_port_data(port);
1891	if (mos7720_port == NULL)
1892		return -ENODEV;
1893
1894	switch (cmd) {
1895	case TIOCSERGETLSR:
1896		dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
1897		return get_lsr_info(tty, mos7720_port,
1898					(unsigned int __user *)arg);
1899
1900	/* FIXME: These should be using the mode methods */
1901	case TIOCMBIS:
1902	case TIOCMBIC:
1903		dev_dbg(&port->dev, "%s TIOCMSET/TIOCMBIC/TIOCMSET\n", __func__);
1904		return set_modem_info(mos7720_port, cmd,
1905				      (unsigned int __user *)arg);
1906
1907	case TIOCGSERIAL:
1908		dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
1909		return get_serial_info(mos7720_port,
1910				       (struct serial_struct __user *)arg);
1911	}
1912
1913	return -ENOIOCTLCMD;
1914}
1915
1916static int mos7720_startup(struct usb_serial *serial)
1917{
1918	struct usb_device *dev;
1919	char data;
1920	u16 product;
1921	int ret_val;
1922
1923	product = le16_to_cpu(serial->dev->descriptor.idProduct);
1924	dev = serial->dev;
1925
1926	/*
1927	 * The 7715 uses the first bulk in/out endpoint pair for the parallel
1928	 * port, and the second for the serial port.  Because the usbserial core
1929	 * assumes both pairs are serial ports, we must engage in a bit of
1930	 * subterfuge and swap the pointers for ports 0 and 1 in order to make
1931	 * port 0 point to the serial port.  However, both moschip devices use a
1932	 * single interrupt-in endpoint for both ports (as mentioned a little
1933	 * further down), and this endpoint was assigned to port 0.  So after
1934	 * the swap, we must copy the interrupt endpoint elements from port 1
1935	 * (as newly assigned) to port 0, and null out port 1 pointers.
1936	 */
1937	if (product == MOSCHIP_DEVICE_ID_7715) {
1938		struct usb_serial_port *tmp = serial->port[0];
1939		serial->port[0] = serial->port[1];
1940		serial->port[1] = tmp;
1941		serial->port[0]->interrupt_in_urb = tmp->interrupt_in_urb;
1942		serial->port[0]->interrupt_in_buffer = tmp->interrupt_in_buffer;
1943		serial->port[0]->interrupt_in_endpointAddress =
1944			tmp->interrupt_in_endpointAddress;
1945		serial->port[1]->interrupt_in_urb = NULL;
1946		serial->port[1]->interrupt_in_buffer = NULL;
1947	}
1948
1949	/* setting configuration feature to one */
1950	usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1951			(__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5000);
1952
1953	/* start the interrupt urb */
1954	ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL);
1955	if (ret_val)
1956		dev_err(&dev->dev,
1957			"%s - Error %d submitting control urb\n",
1958			__func__, ret_val);
1959
1960#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
1961	if (product == MOSCHIP_DEVICE_ID_7715) {
1962		ret_val = mos7715_parport_init(serial);
1963		if (ret_val < 0)
1964			return ret_val;
1965	}
1966#endif
1967	/* LSR For Port 1 */
1968	read_mos_reg(serial, 0, MOS7720_LSR, &data);
1969	dev_dbg(&dev->dev, "LSR:%x\n", data);
1970
1971	return 0;
1972}
1973
1974static void mos7720_release(struct usb_serial *serial)
1975{
1976#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
1977	/* close the parallel port */
1978
1979	if (le16_to_cpu(serial->dev->descriptor.idProduct)
1980	    == MOSCHIP_DEVICE_ID_7715) {
1981		struct urbtracker *urbtrack;
1982		unsigned long flags;
1983		struct mos7715_parport *mos_parport =
1984			usb_get_serial_data(serial);
1985
1986		/* prevent NULL ptr dereference in port callbacks */
1987		spin_lock(&release_lock);
1988		mos_parport->pp->private_data = NULL;
1989		spin_unlock(&release_lock);
1990
1991		/* wait for synchronous usb calls to return */
1992		if (mos_parport->msg_pending)
1993			wait_for_completion_timeout(&mos_parport->syncmsg_compl,
1994					    msecs_to_jiffies(MOS_WDR_TIMEOUT));
1995
1996		parport_remove_port(mos_parport->pp);
1997		usb_set_serial_data(serial, NULL);
1998		mos_parport->serial = NULL;
1999
2000		/* if tasklet currently scheduled, wait for it to complete */
2001		tasklet_kill(&mos_parport->urb_tasklet);
2002
2003		/* unlink any urbs sent by the tasklet  */
2004		spin_lock_irqsave(&mos_parport->listlock, flags);
2005		list_for_each_entry(urbtrack,
2006				    &mos_parport->active_urbs,
2007				    urblist_entry)
2008			usb_unlink_urb(urbtrack->urb);
2009		spin_unlock_irqrestore(&mos_parport->listlock, flags);
2010
2011		kref_put(&mos_parport->ref_count, destroy_mos_parport);
2012	}
2013#endif
2014}
2015
2016static int mos7720_port_probe(struct usb_serial_port *port)
2017{
2018	struct moschip_port *mos7720_port;
2019
2020	mos7720_port = kzalloc(sizeof(*mos7720_port), GFP_KERNEL);
2021	if (!mos7720_port)
2022		return -ENOMEM;
2023
2024	/* Initialize all port interrupt end point to port 0 int endpoint.
2025	 * Our device has only one interrupt endpoint common to all ports.
2026	 */
2027	port->interrupt_in_endpointAddress =
2028		port->serial->port[0]->interrupt_in_endpointAddress;
2029	mos7720_port->port = port;
2030
2031	usb_set_serial_port_data(port, mos7720_port);
2032
2033	return 0;
2034}
2035
2036static int mos7720_port_remove(struct usb_serial_port *port)
2037{
2038	struct moschip_port *mos7720_port;
2039
2040	mos7720_port = usb_get_serial_port_data(port);
2041	kfree(mos7720_port);
2042
2043	return 0;
2044}
2045
2046static struct usb_serial_driver moschip7720_2port_driver = {
2047	.driver = {
2048		.owner =	THIS_MODULE,
2049		.name =		"moschip7720",
2050	},
2051	.description		= "Moschip 2 port adapter",
2052	.id_table		= id_table,
2053	.calc_num_ports		= mos77xx_calc_num_ports,
2054	.open			= mos7720_open,
2055	.close			= mos7720_close,
2056	.throttle		= mos7720_throttle,
2057	.unthrottle		= mos7720_unthrottle,
2058	.probe			= mos77xx_probe,
2059	.attach			= mos7720_startup,
2060	.release		= mos7720_release,
2061	.port_probe		= mos7720_port_probe,
2062	.port_remove		= mos7720_port_remove,
2063	.ioctl			= mos7720_ioctl,
2064	.tiocmget		= mos7720_tiocmget,
2065	.tiocmset		= mos7720_tiocmset,
2066	.set_termios		= mos7720_set_termios,
2067	.write			= mos7720_write,
2068	.write_room		= mos7720_write_room,
2069	.chars_in_buffer	= mos7720_chars_in_buffer,
2070	.break_ctl		= mos7720_break,
2071	.read_bulk_callback	= mos7720_bulk_in_callback,
2072	.read_int_callback	= NULL  /* dynamically assigned in probe() */
2073};
2074
2075static struct usb_serial_driver * const serial_drivers[] = {
2076	&moschip7720_2port_driver, NULL
2077};
2078
2079module_usb_serial_driver(serial_drivers, id_table);
2080
2081MODULE_AUTHOR(DRIVER_AUTHOR);
2082MODULE_DESCRIPTION(DRIVER_DESC);
2083MODULE_LICENSE("GPL");