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Linux/drivers/usb/serial/mos7720.c

  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 */
 59 struct 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 
 68 static 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 
 74 static 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 };
 79 MODULE_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 
 87 struct 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 
 95 enum 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 
101 struct 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 */
117 static DEFINE_SPINLOCK(release_lock);
118 
119 #endif  /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
120 
121 static const unsigned int dummy; /* for clarity in register access fns */
122 
123 enum mos_regs {
124         THR,              /* serial port regs */
125         RHR,
126         IER,
127         FCR,
128         ISR,
129         LCR,
130         MCR,
131         LSR,
132         MSR,
133         SPR,
134         DLL,
135         DLM,
136         DPR,              /* parallel port regs */
137         DSR,
138         DCR,
139         ECR,
140         SP1_REG,          /* device control regs */
141         SP2_REG,          /* serial port 2 (7720 only) */
142         PP_REG,
143         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  */
150 static inline __u16 get_reg_index(enum mos_regs reg)
151 {
152         static const __u16 mos7715_index_lookup_table[] = {
153                 0x00,           /* THR */
154                 0x00,           /* RHR */
155                 0x01,           /* IER */
156                 0x02,           /* FCR */
157                 0x02,           /* ISR */
158                 0x03,           /* LCR */
159                 0x04,           /* MCR */
160                 0x05,           /* LSR */
161                 0x06,           /* MSR */
162                 0x07,           /* SPR */
163                 0x00,           /* DLL */
164                 0x01,           /* DLM */
165                 0x00,           /* DPR */
166                 0x01,           /* DSR */
167                 0x02,           /* DCR */
168                 0x0a,           /* ECR */
169                 0x01,           /* SP1_REG */
170                 0x02,           /* SP2_REG (7720 only) */
171                 0x04,           /* PP_REG (7715 only) */
172                 0x08,           /* 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  */
181 static inline __u16 get_reg_value(enum mos_regs reg,
182                                   unsigned int serial_portnum)
183 {
184         if (reg >= SP1_REG)           /* control reg */
185                 return 0x0000;
186 
187         else if (reg >= 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  */
199 static 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  */
221 static 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 
251 static inline int mos7715_change_mode(struct mos7715_parport *mos_parport,
252                                       enum mos7715_pp_modes mode)
253 {
254         mos_parport->shadowECR = mode;
255         write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR);
256         return 0;
257 }
258 
259 static void destroy_mos_parport(struct kref *kref)
260 {
261         struct mos7715_parport *mos_parport =
262                 container_of(kref, struct mos7715_parport, ref_count);
263 
264         kfree(mos_parport);
265 }
266 
267 static void destroy_urbtracker(struct kref *kref)
268 {
269         struct urbtracker *urbtrack =
270                 container_of(kref, struct urbtracker, ref_count);
271         struct mos7715_parport *mos_parport = urbtrack->mos_parport;
272 
273         usb_free_urb(urbtrack->urb);
274         kfree(urbtrack->setup);
275         kfree(urbtrack);
276         kref_put(&mos_parport->ref_count, destroy_mos_parport);
277 }
278 
279 /*
280  * This runs as a tasklet when sending an urb in a non-blocking parallel
281  * port callback had to be deferred because the disconnect mutex could not be
282  * obtained at the time.
283  */
284 static void send_deferred_urbs(unsigned long _mos_parport)
285 {
286         int ret_val;
287         unsigned long flags;
288         struct mos7715_parport *mos_parport = (void *)_mos_parport;
289         struct urbtracker *urbtrack, *tmp;
290         struct list_head *cursor, *next;
291         struct device *dev;
292 
293         /* if release function ran, game over */
294         if (unlikely(mos_parport->serial == NULL))
295                 return;
296 
297         dev = &mos_parport->serial->dev->dev;
298 
299         /* try again to get the mutex */
300         if (!mutex_trylock(&mos_parport->serial->disc_mutex)) {
301                 dev_dbg(dev, "%s: rescheduling tasklet\n", __func__);
302                 tasklet_schedule(&mos_parport->urb_tasklet);
303                 return;
304         }
305 
306         /* if device disconnected, game over */
307         if (unlikely(mos_parport->serial->disconnected)) {
308                 mutex_unlock(&mos_parport->serial->disc_mutex);
309                 return;
310         }
311 
312         spin_lock_irqsave(&mos_parport->listlock, flags);
313         if (list_empty(&mos_parport->deferred_urbs)) {
314                 spin_unlock_irqrestore(&mos_parport->listlock, flags);
315                 mutex_unlock(&mos_parport->serial->disc_mutex);
316                 dev_dbg(dev, "%s: deferred_urbs list empty\n", __func__);
317                 return;
318         }
319 
320         /* move contents of deferred_urbs list to active_urbs list and submit */
321         list_for_each_safe(cursor, next, &mos_parport->deferred_urbs)
322                 list_move_tail(cursor, &mos_parport->active_urbs);
323         list_for_each_entry_safe(urbtrack, tmp, &mos_parport->active_urbs,
324                             urblist_entry) {
325                 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
326                 dev_dbg(dev, "%s: urb submitted\n", __func__);
327                 if (ret_val) {
328                         dev_err(dev, "usb_submit_urb() failed: %d\n", ret_val);
329                         list_del(&urbtrack->urblist_entry);
330                         kref_put(&urbtrack->ref_count, destroy_urbtracker);
331                 }
332         }
333         spin_unlock_irqrestore(&mos_parport->listlock, flags);
334         mutex_unlock(&mos_parport->serial->disc_mutex);
335 }
336 
337 /* callback for parallel port control urbs submitted asynchronously */
338 static void async_complete(struct urb *urb)
339 {
340         struct urbtracker *urbtrack = urb->context;
341         int status = urb->status;
342 
343         if (unlikely(status))
344                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n", __func__, status);
345 
346         /* remove the urbtracker from the active_urbs list */
347         spin_lock(&urbtrack->mos_parport->listlock);
348         list_del(&urbtrack->urblist_entry);
349         spin_unlock(&urbtrack->mos_parport->listlock);
350         kref_put(&urbtrack->ref_count, destroy_urbtracker);
351 }
352 
353 static int write_parport_reg_nonblock(struct mos7715_parport *mos_parport,
354                                       enum mos_regs reg, __u8 data)
355 {
356         struct urbtracker *urbtrack;
357         int ret_val;
358         unsigned long flags;
359         struct usb_serial *serial = mos_parport->serial;
360         struct usb_device *usbdev = serial->dev;
361 
362         /* create and initialize the control urb and containing urbtracker */
363         urbtrack = kmalloc(sizeof(struct urbtracker), GFP_ATOMIC);
364         if (!urbtrack)
365                 return -ENOMEM;
366 
367         kref_get(&mos_parport->ref_count);
368         urbtrack->mos_parport = mos_parport;
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_init(&urbtrack->ref_count);
390         INIT_LIST_HEAD(&urbtrack->urblist_entry);
391 
392         /*
393          * get the disconnect mutex, or add tracker to the deferred_urbs list
394          * and schedule a tasklet to try again later
395          */
396         if (!mutex_trylock(&serial->disc_mutex)) {
397                 spin_lock_irqsave(&mos_parport->listlock, flags);
398                 list_add_tail(&urbtrack->urblist_entry,
399                               &mos_parport->deferred_urbs);
400                 spin_unlock_irqrestore(&mos_parport->listlock, flags);
401                 tasklet_schedule(&mos_parport->urb_tasklet);
402                 dev_dbg(&usbdev->dev, "tasklet scheduled\n");
403                 return 0;
404         }
405 
406         /* bail if device disconnected */
407         if (serial->disconnected) {
408                 kref_put(&urbtrack->ref_count, destroy_urbtracker);
409                 mutex_unlock(&serial->disc_mutex);
410                 return -ENODEV;
411         }
412 
413         /* add the tracker to the active_urbs list and submit */
414         spin_lock_irqsave(&mos_parport->listlock, flags);
415         list_add_tail(&urbtrack->urblist_entry, &mos_parport->active_urbs);
416         spin_unlock_irqrestore(&mos_parport->listlock, flags);
417         ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
418         mutex_unlock(&serial->disc_mutex);
419         if (ret_val) {
420                 dev_err(&usbdev->dev,
421                         "%s: submit_urb() failed: %d\n", __func__, ret_val);
422                 spin_lock_irqsave(&mos_parport->listlock, flags);
423                 list_del(&urbtrack->urblist_entry);
424                 spin_unlock_irqrestore(&mos_parport->listlock, flags);
425                 kref_put(&urbtrack->ref_count, destroy_urbtracker);
426                 return ret_val;
427         }
428         return 0;
429 }
430 
431 /*
432  * This is the the common top part of all parallel port callback operations that
433  * send synchronous messages to the device.  This implements convoluted locking
434  * that avoids two scenarios: (1) a port operation is called after usbserial
435  * has called our release function, at which point struct mos7715_parport has
436  * been destroyed, and (2) the device has been disconnected, but usbserial has
437  * not called the release function yet because someone has a serial port open.
438  * The shared release_lock prevents the first, and the mutex and disconnected
439  * flag maintained by usbserial covers the second.  We also use the msg_pending
440  * flag to ensure that all synchronous usb message calls have completed before
441  * our release function can return.
442  */
443 static int parport_prologue(struct parport *pp)
444 {
445         struct mos7715_parport *mos_parport;
446 
447         spin_lock(&release_lock);
448         mos_parport = pp->private_data;
449         if (unlikely(mos_parport == NULL)) {
450                 /* release fn called, port struct destroyed */
451                 spin_unlock(&release_lock);
452                 return -1;
453         }
454         mos_parport->msg_pending = true;   /* synch usb call pending */
455         reinit_completion(&mos_parport->syncmsg_compl);
456         spin_unlock(&release_lock);
457 
458         mutex_lock(&mos_parport->serial->disc_mutex);
459         if (mos_parport->serial->disconnected) {
460                 /* device disconnected */
461                 mutex_unlock(&mos_parport->serial->disc_mutex);
462                 mos_parport->msg_pending = false;
463                 complete(&mos_parport->syncmsg_compl);
464                 return -1;
465         }
466 
467         return 0;
468 }
469 
470 /*
471  * This is the common bottom part of all parallel port functions that send
472  * synchronous messages to the device.
473  */
474 static inline void parport_epilogue(struct parport *pp)
475 {
476         struct mos7715_parport *mos_parport = pp->private_data;
477         mutex_unlock(&mos_parport->serial->disc_mutex);
478         mos_parport->msg_pending = false;
479         complete(&mos_parport->syncmsg_compl);
480 }
481 
482 static void parport_mos7715_write_data(struct parport *pp, unsigned char d)
483 {
484         struct mos7715_parport *mos_parport = pp->private_data;
485 
486         if (parport_prologue(pp) < 0)
487                 return;
488         mos7715_change_mode(mos_parport, SPP);
489         write_mos_reg(mos_parport->serial, dummy, DPR, (__u8)d);
490         parport_epilogue(pp);
491 }
492 
493 static unsigned char parport_mos7715_read_data(struct parport *pp)
494 {
495         struct mos7715_parport *mos_parport = pp->private_data;
496         unsigned char d;
497 
498         if (parport_prologue(pp) < 0)
499                 return 0;
500         read_mos_reg(mos_parport->serial, dummy, DPR, &d);
501         parport_epilogue(pp);
502         return d;
503 }
504 
505 static void parport_mos7715_write_control(struct parport *pp, unsigned char d)
506 {
507         struct mos7715_parport *mos_parport = pp->private_data;
508         __u8 data;
509 
510         if (parport_prologue(pp) < 0)
511                 return;
512         data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0);
513         write_mos_reg(mos_parport->serial, dummy, DCR, data);
514         mos_parport->shadowDCR = data;
515         parport_epilogue(pp);
516 }
517 
518 static unsigned char parport_mos7715_read_control(struct parport *pp)
519 {
520         struct mos7715_parport *mos_parport = pp->private_data;
521         __u8 dcr;
522 
523         spin_lock(&release_lock);
524         mos_parport = pp->private_data;
525         if (unlikely(mos_parport == NULL)) {
526                 spin_unlock(&release_lock);
527                 return 0;
528         }
529         dcr = mos_parport->shadowDCR & 0x0f;
530         spin_unlock(&release_lock);
531         return dcr;
532 }
533 
534 static unsigned char parport_mos7715_frob_control(struct parport *pp,
535                                                   unsigned char mask,
536                                                   unsigned char val)
537 {
538         struct mos7715_parport *mos_parport = pp->private_data;
539         __u8 dcr;
540 
541         mask &= 0x0f;
542         val &= 0x0f;
543         if (parport_prologue(pp) < 0)
544                 return 0;
545         mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val;
546         write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
547         dcr = mos_parport->shadowDCR & 0x0f;
548         parport_epilogue(pp);
549         return dcr;
550 }
551 
552 static unsigned char parport_mos7715_read_status(struct parport *pp)
553 {
554         unsigned char status;
555         struct mos7715_parport *mos_parport = pp->private_data;
556 
557         spin_lock(&release_lock);
558         mos_parport = pp->private_data;
559         if (unlikely(mos_parport == NULL)) {    /* release called */
560                 spin_unlock(&release_lock);
561                 return 0;
562         }
563         status = atomic_read(&mos_parport->shadowDSR) & 0xf8;
564         spin_unlock(&release_lock);
565         return status;
566 }
567 
568 static void parport_mos7715_enable_irq(struct parport *pp)
569 {
570 }
571 
572 static void parport_mos7715_disable_irq(struct parport *pp)
573 {
574 }
575 
576 static void parport_mos7715_data_forward(struct parport *pp)
577 {
578         struct mos7715_parport *mos_parport = pp->private_data;
579 
580         if (parport_prologue(pp) < 0)
581                 return;
582         mos7715_change_mode(mos_parport, PS2);
583         mos_parport->shadowDCR &=  ~0x20;
584         write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
585         parport_epilogue(pp);
586 }
587 
588 static void parport_mos7715_data_reverse(struct parport *pp)
589 {
590         struct mos7715_parport *mos_parport = pp->private_data;
591 
592         if (parport_prologue(pp) < 0)
593                 return;
594         mos7715_change_mode(mos_parport, PS2);
595         mos_parport->shadowDCR |= 0x20;
596         write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
597         parport_epilogue(pp);
598 }
599 
600 static void parport_mos7715_init_state(struct pardevice *dev,
601                                        struct parport_state *s)
602 {
603         s->u.pc.ctr = DCR_INIT_VAL;
604         s->u.pc.ecr = ECR_INIT_VAL;
605 }
606 
607 /* N.B. Parport core code requires that this function not block */
608 static void parport_mos7715_save_state(struct parport *pp,
609                                        struct parport_state *s)
610 {
611         struct mos7715_parport *mos_parport;
612 
613         spin_lock(&release_lock);
614         mos_parport = pp->private_data;
615         if (unlikely(mos_parport == NULL)) {    /* release called */
616                 spin_unlock(&release_lock);
617                 return;
618         }
619         s->u.pc.ctr = mos_parport->shadowDCR;
620         s->u.pc.ecr = mos_parport->shadowECR;
621         spin_unlock(&release_lock);
622 }
623 
624 /* N.B. Parport core code requires that this function not block */
625 static void parport_mos7715_restore_state(struct parport *pp,
626                                           struct parport_state *s)
627 {
628         struct mos7715_parport *mos_parport;
629 
630         spin_lock(&release_lock);
631         mos_parport = pp->private_data;
632         if (unlikely(mos_parport == NULL)) {    /* release called */
633                 spin_unlock(&release_lock);
634                 return;
635         }
636         write_parport_reg_nonblock(mos_parport, DCR, mos_parport->shadowDCR);
637         write_parport_reg_nonblock(mos_parport, ECR, mos_parport->shadowECR);
638         spin_unlock(&release_lock);
639 }
640 
641 static size_t parport_mos7715_write_compat(struct parport *pp,
642                                            const void *buffer,
643                                            size_t len, int flags)
644 {
645         int retval;
646         struct mos7715_parport *mos_parport = pp->private_data;
647         int actual_len;
648 
649         if (parport_prologue(pp) < 0)
650                 return 0;
651         mos7715_change_mode(mos_parport, PPF);
652         retval = usb_bulk_msg(mos_parport->serial->dev,
653                               usb_sndbulkpipe(mos_parport->serial->dev, 2),
654                               (void *)buffer, len, &actual_len,
655                               MOS_WDR_TIMEOUT);
656         parport_epilogue(pp);
657         if (retval) {
658                 dev_err(&mos_parport->serial->dev->dev,
659                         "mos7720: usb_bulk_msg() failed: %d\n", retval);
660                 return 0;
661         }
662         return actual_len;
663 }
664 
665 static struct parport_operations parport_mos7715_ops = {
666         .owner =                THIS_MODULE,
667         .write_data =           parport_mos7715_write_data,
668         .read_data =            parport_mos7715_read_data,
669 
670         .write_control =        parport_mos7715_write_control,
671         .read_control =         parport_mos7715_read_control,
672         .frob_control =         parport_mos7715_frob_control,
673 
674         .read_status =          parport_mos7715_read_status,
675 
676         .enable_irq =           parport_mos7715_enable_irq,
677         .disable_irq =          parport_mos7715_disable_irq,
678 
679         .data_forward =         parport_mos7715_data_forward,
680         .data_reverse =         parport_mos7715_data_reverse,
681 
682         .init_state =           parport_mos7715_init_state,
683         .save_state =           parport_mos7715_save_state,
684         .restore_state =        parport_mos7715_restore_state,
685 
686         .compat_write_data =    parport_mos7715_write_compat,
687 
688         .nibble_read_data =     parport_ieee1284_read_nibble,
689         .byte_read_data =       parport_ieee1284_read_byte,
690 };
691 
692 /*
693  * Allocate and initialize parallel port control struct, initialize
694  * the parallel port hardware device, and register with the parport subsystem.
695  */
696 static int mos7715_parport_init(struct usb_serial *serial)
697 {
698         struct mos7715_parport *mos_parport;
699 
700         /* allocate and initialize parallel port control struct */
701         mos_parport = kzalloc(sizeof(struct mos7715_parport), GFP_KERNEL);
702         if (!mos_parport)
703                 return -ENOMEM;
704 
705         mos_parport->msg_pending = false;
706         kref_init(&mos_parport->ref_count);
707         spin_lock_init(&mos_parport->listlock);
708         INIT_LIST_HEAD(&mos_parport->active_urbs);
709         INIT_LIST_HEAD(&mos_parport->deferred_urbs);
710         usb_set_serial_data(serial, mos_parport); /* hijack private pointer */
711         mos_parport->serial = serial;
712         tasklet_init(&mos_parport->urb_tasklet, send_deferred_urbs,
713                      (unsigned long) mos_parport);
714         init_completion(&mos_parport->syncmsg_compl);
715 
716         /* cycle parallel port reset bit */
717         write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x80);
718         write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x00);
719 
720         /* initialize device registers */
721         mos_parport->shadowDCR = DCR_INIT_VAL;
722         write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
723         mos_parport->shadowECR = ECR_INIT_VAL;
724         write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR);
725 
726         /* register with parport core */
727         mos_parport->pp = parport_register_port(0, PARPORT_IRQ_NONE,
728                                                 PARPORT_DMA_NONE,
729                                                 &parport_mos7715_ops);
730         if (mos_parport->pp == NULL) {
731                 dev_err(&serial->interface->dev,
732                         "Could not register parport\n");
733                 kref_put(&mos_parport->ref_count, destroy_mos_parport);
734                 return -EIO;
735         }
736         mos_parport->pp->private_data = mos_parport;
737         mos_parport->pp->modes = PARPORT_MODE_COMPAT | PARPORT_MODE_PCSPP;
738         mos_parport->pp->dev = &serial->interface->dev;
739         parport_announce_port(mos_parport->pp);
740 
741         return 0;
742 }
743 #endif  /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
744 
745 /*
746  * mos7720_interrupt_callback
747  *      this is the callback function for when we have received data on the
748  *      interrupt endpoint.
749  */
750 static void mos7720_interrupt_callback(struct urb *urb)
751 {
752         int result;
753         int length;
754         int status = urb->status;
755         struct device *dev = &urb->dev->dev;
756         __u8 *data;
757         __u8 sp1;
758         __u8 sp2;
759 
760         switch (status) {
761         case 0:
762                 /* success */
763                 break;
764         case -ECONNRESET:
765         case -ENOENT:
766         case -ESHUTDOWN:
767                 /* this urb is terminated, clean up */
768                 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
769                 return;
770         default:
771                 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
772                 goto exit;
773         }
774 
775         length = urb->actual_length;
776         data = urb->transfer_buffer;
777 
778         /* Moschip get 4 bytes
779          * Byte 1 IIR Port 1 (port.number is 0)
780          * Byte 2 IIR Port 2 (port.number is 1)
781          * Byte 3 --------------
782          * Byte 4 FIFO status for both */
783 
784         /* the above description is inverted
785          *      oneukum 2007-03-14 */
786 
787         if (unlikely(length != 4)) {
788                 dev_dbg(dev, "Wrong data !!!\n");
789                 return;
790         }
791 
792         sp1 = data[3];
793         sp2 = data[2];
794 
795         if ((sp1 | sp2) & 0x01) {
796                 /* No Interrupt Pending in both the ports */
797                 dev_dbg(dev, "No Interrupt !!!\n");
798         } else {
799                 switch (sp1 & 0x0f) {
800                 case SERIAL_IIR_RLS:
801                         dev_dbg(dev, "Serial Port 1: Receiver status error or address bit detected in 9-bit mode\n");
802                         break;
803                 case SERIAL_IIR_CTI:
804                         dev_dbg(dev, "Serial Port 1: Receiver time out\n");
805                         break;
806                 case SERIAL_IIR_MS:
807                         /* dev_dbg(dev, "Serial Port 1: Modem status change\n"); */
808                         break;
809                 }
810 
811                 switch (sp2 & 0x0f) {
812                 case SERIAL_IIR_RLS:
813                         dev_dbg(dev, "Serial Port 2: Receiver status error or address bit detected in 9-bit mode\n");
814                         break;
815                 case SERIAL_IIR_CTI:
816                         dev_dbg(dev, "Serial Port 2: Receiver time out\n");
817                         break;
818                 case SERIAL_IIR_MS:
819                         /* dev_dbg(dev, "Serial Port 2: Modem status change\n"); */
820                         break;
821                 }
822         }
823 
824 exit:
825         result = usb_submit_urb(urb, GFP_ATOMIC);
826         if (result)
827                 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result);
828 }
829 
830 /*
831  * mos7715_interrupt_callback
832  *      this is the 7715's callback function for when we have received data on
833  *      the interrupt endpoint.
834  */
835 static void mos7715_interrupt_callback(struct urb *urb)
836 {
837         int result;
838         int length;
839         int status = urb->status;
840         struct device *dev = &urb->dev->dev;
841         __u8 *data;
842         __u8 iir;
843 
844         switch (status) {
845         case 0:
846                 /* success */
847                 break;
848         case -ECONNRESET:
849         case -ENOENT:
850         case -ESHUTDOWN:
851         case -ENODEV:
852                 /* this urb is terminated, clean up */
853                 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
854                 return;
855         default:
856                 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
857                 goto exit;
858         }
859 
860         length = urb->actual_length;
861         data = urb->transfer_buffer;
862 
863         /* Structure of data from 7715 device:
864          * Byte 1: IIR serial Port
865          * Byte 2: unused
866          * Byte 2: DSR parallel port
867          * Byte 4: FIFO status for both */
868 
869         if (unlikely(length != 4)) {
870                 dev_dbg(dev, "Wrong data !!!\n");
871                 return;
872         }
873 
874         iir = data[0];
875         if (!(iir & 0x01)) {    /* serial port interrupt pending */
876                 switch (iir & 0x0f) {
877                 case SERIAL_IIR_RLS:
878                         dev_dbg(dev, "Serial Port: Receiver status error or address bit detected in 9-bit mode\n");
879                         break;
880                 case SERIAL_IIR_CTI:
881                         dev_dbg(dev, "Serial Port: Receiver time out\n");
882                         break;
883                 case SERIAL_IIR_MS:
884                         /* dev_dbg(dev, "Serial Port: Modem status change\n"); */
885                         break;
886                 }
887         }
888 
889 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
890         {       /* update local copy of DSR reg */
891                 struct usb_serial_port *port = urb->context;
892                 struct mos7715_parport *mos_parport = port->serial->private;
893                 if (unlikely(mos_parport == NULL))
894                         return;
895                 atomic_set(&mos_parport->shadowDSR, data[2]);
896         }
897 #endif
898 
899 exit:
900         result = usb_submit_urb(urb, GFP_ATOMIC);
901         if (result)
902                 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result);
903 }
904 
905 /*
906  * mos7720_bulk_in_callback
907  *      this is the callback function for when we have received data on the
908  *      bulk in endpoint.
909  */
910 static void mos7720_bulk_in_callback(struct urb *urb)
911 {
912         int retval;
913         unsigned char *data ;
914         struct usb_serial_port *port;
915         int status = urb->status;
916 
917         if (status) {
918                 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
919                 return;
920         }
921 
922         port = urb->context;
923 
924         dev_dbg(&port->dev, "Entering...%s\n", __func__);
925 
926         data = urb->transfer_buffer;
927 
928         if (urb->actual_length) {
929                 tty_insert_flip_string(&port->port, data, urb->actual_length);
930                 tty_flip_buffer_push(&port->port);
931         }
932 
933         if (port->read_urb->status != -EINPROGRESS) {
934                 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
935                 if (retval)
936                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
937         }
938 }
939 
940 /*
941  * mos7720_bulk_out_data_callback
942  *      this is the callback function for when we have finished sending serial
943  *      data on the bulk out endpoint.
944  */
945 static void mos7720_bulk_out_data_callback(struct urb *urb)
946 {
947         struct moschip_port *mos7720_port;
948         int status = urb->status;
949 
950         if (status) {
951                 dev_dbg(&urb->dev->dev, "nonzero write bulk status received:%d\n", status);
952                 return;
953         }
954 
955         mos7720_port = urb->context;
956         if (!mos7720_port) {
957                 dev_dbg(&urb->dev->dev, "NULL mos7720_port pointer\n");
958                 return ;
959         }
960 
961         if (mos7720_port->open)
962                 tty_port_tty_wakeup(&mos7720_port->port->port);
963 }
964 
965 /*
966  * mos77xx_probe
967  *      this function installs the appropriate read interrupt endpoint callback
968  *      depending on whether the device is a 7720 or 7715, thus avoiding costly
969  *      run-time checks in the high-frequency callback routine itself.
970  */
971 static int mos77xx_probe(struct usb_serial *serial,
972                          const struct usb_device_id *id)
973 {
974         if (id->idProduct == MOSCHIP_DEVICE_ID_7715)
975                 moschip7720_2port_driver.read_int_callback =
976                         mos7715_interrupt_callback;
977         else
978                 moschip7720_2port_driver.read_int_callback =
979                         mos7720_interrupt_callback;
980 
981         return 0;
982 }
983 
984 static int mos77xx_calc_num_ports(struct usb_serial *serial)
985 {
986         u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
987         if (product == MOSCHIP_DEVICE_ID_7715)
988                 return 1;
989 
990         return 2;
991 }
992 
993 static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port)
994 {
995         struct usb_serial *serial;
996         struct urb *urb;
997         struct moschip_port *mos7720_port;
998         int response;
999         int port_number;
1000         __u8 data;
1001         int allocated_urbs = 0;
1002         int j;
1003 
1004         serial = port->serial;
1005 
1006         mos7720_port = usb_get_serial_port_data(port);
1007         if (mos7720_port == NULL)
1008                 return -ENODEV;
1009 
1010         usb_clear_halt(serial->dev, port->write_urb->pipe);
1011         usb_clear_halt(serial->dev, port->read_urb->pipe);
1012 
1013         /* Initialising the write urb pool */
1014         for (j = 0; j < NUM_URBS; ++j) {
1015                 urb = usb_alloc_urb(0, GFP_KERNEL);
1016                 mos7720_port->write_urb_pool[j] = urb;
1017                 if (!urb)
1018                         continue;
1019 
1020                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1021                                                GFP_KERNEL);
1022                 if (!urb->transfer_buffer) {
1023                         usb_free_urb(mos7720_port->write_urb_pool[j]);
1024                         mos7720_port->write_urb_pool[j] = NULL;
1025                         continue;
1026                 }
1027                 allocated_urbs++;
1028         }
1029 
1030         if (!allocated_urbs)
1031                 return -ENOMEM;
1032 
1033          /* Initialize MCS7720 -- Write Init values to corresponding Registers
1034           *
1035           * Register Index
1036           * 0 : THR/RHR
1037           * 1 : IER
1038           * 2 : FCR
1039           * 3 : LCR
1040           * 4 : MCR
1041           * 5 : LSR
1042           * 6 : MSR
1043           * 7 : SPR
1044           *
1045           * 0x08 : SP1/2 Control Reg
1046           */
1047         port_number = port->port_number;
1048         read_mos_reg(serial, port_number, LSR, &data);
1049 
1050         dev_dbg(&port->dev, "SS::%p LSR:%x\n", mos7720_port, data);
1051 
1052         write_mos_reg(serial, dummy, SP1_REG, 0x02);
1053         write_mos_reg(serial, dummy, SP2_REG, 0x02);
1054 
1055         write_mos_reg(serial, port_number, IER, 0x00);
1056         write_mos_reg(serial, port_number, FCR, 0x00);
1057 
1058         write_mos_reg(serial, port_number, FCR, 0xcf);
1059         mos7720_port->shadowLCR = 0x03;
1060         write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1061         mos7720_port->shadowMCR = 0x0b;
1062         write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1063 
1064         write_mos_reg(serial, port_number, SP_CONTROL_REG, 0x00);
1065         read_mos_reg(serial, dummy, SP_CONTROL_REG, &data);
1066         data = data | (port->port_number + 1);
1067         write_mos_reg(serial, dummy, SP_CONTROL_REG, data);
1068         mos7720_port->shadowLCR = 0x83;
1069         write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1070         write_mos_reg(serial, port_number, THR, 0x0c);
1071         write_mos_reg(serial, port_number, IER, 0x00);
1072         mos7720_port->shadowLCR = 0x03;
1073         write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1074         write_mos_reg(serial, port_number, IER, 0x0c);
1075 
1076         response = usb_submit_urb(port->read_urb, GFP_KERNEL);
1077         if (response)
1078                 dev_err(&port->dev, "%s - Error %d submitting read urb\n",
1079                                                         __func__, response);
1080 
1081         /* initialize our port settings */
1082         mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */
1083 
1084         /* send a open port command */
1085         mos7720_port->open = 1;
1086 
1087         return 0;
1088 }
1089 
1090 /*
1091  * mos7720_chars_in_buffer
1092  *      this function is called by the tty driver when it wants to know how many
1093  *      bytes of data we currently have outstanding in the port (data that has
1094  *      been written, but hasn't made it out the port yet)
1095  *      If successful, we return the number of bytes left to be written in the
1096  *      system,
1097  *      Otherwise we return a negative error number.
1098  */
1099 static int mos7720_chars_in_buffer(struct tty_struct *tty)
1100 {
1101         struct usb_serial_port *port = tty->driver_data;
1102         int i;
1103         int chars = 0;
1104         struct moschip_port *mos7720_port;
1105 
1106         mos7720_port = usb_get_serial_port_data(port);
1107         if (mos7720_port == NULL)
1108                 return 0;
1109 
1110         for (i = 0; i < NUM_URBS; ++i) {
1111                 if (mos7720_port->write_urb_pool[i] &&
1112                     mos7720_port->write_urb_pool[i]->status == -EINPROGRESS)
1113                         chars += URB_TRANSFER_BUFFER_SIZE;
1114         }
1115         dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1116         return chars;
1117 }
1118 
1119 static void mos7720_close(struct usb_serial_port *port)
1120 {
1121         struct usb_serial *serial;
1122         struct moschip_port *mos7720_port;
1123         int j;
1124 
1125         serial = port->serial;
1126 
1127         mos7720_port = usb_get_serial_port_data(port);
1128         if (mos7720_port == NULL)
1129                 return;
1130 
1131         for (j = 0; j < NUM_URBS; ++j)
1132                 usb_kill_urb(mos7720_port->write_urb_pool[j]);
1133 
1134         /* Freeing Write URBs */
1135         for (j = 0; j < NUM_URBS; ++j) {
1136                 if (mos7720_port->write_urb_pool[j]) {
1137                         kfree(mos7720_port->write_urb_pool[j]->transfer_buffer);
1138                         usb_free_urb(mos7720_port->write_urb_pool[j]);
1139                 }
1140         }
1141 
1142         /* While closing port, shutdown all bulk read, write  *
1143          * and interrupt read if they exists, otherwise nop   */
1144         usb_kill_urb(port->write_urb);
1145         usb_kill_urb(port->read_urb);
1146 
1147         write_mos_reg(serial, port->port_number, MCR, 0x00);
1148         write_mos_reg(serial, port->port_number, IER, 0x00);
1149 
1150         mos7720_port->open = 0;
1151 }
1152 
1153 static void mos7720_break(struct tty_struct *tty, int break_state)
1154 {
1155         struct usb_serial_port *port = tty->driver_data;
1156         unsigned char data;
1157         struct usb_serial *serial;
1158         struct moschip_port *mos7720_port;
1159 
1160         serial = port->serial;
1161 
1162         mos7720_port = usb_get_serial_port_data(port);
1163         if (mos7720_port == NULL)
1164                 return;
1165 
1166         if (break_state == -1)
1167                 data = mos7720_port->shadowLCR | UART_LCR_SBC;
1168         else
1169                 data = mos7720_port->shadowLCR & ~UART_LCR_SBC;
1170 
1171         mos7720_port->shadowLCR  = data;
1172         write_mos_reg(serial, port->port_number, LCR, mos7720_port->shadowLCR);
1173 }
1174 
1175 /*
1176  * mos7720_write_room
1177  *      this function is called by the tty driver when it wants to know how many
1178  *      bytes of data we can accept for a specific port.
1179  *      If successful, we return the amount of room that we have for this port
1180  *      Otherwise we return a negative error number.
1181  */
1182 static int mos7720_write_room(struct tty_struct *tty)
1183 {
1184         struct usb_serial_port *port = tty->driver_data;
1185         struct moschip_port *mos7720_port;
1186         int room = 0;
1187         int i;
1188 
1189         mos7720_port = usb_get_serial_port_data(port);
1190         if (mos7720_port == NULL)
1191                 return -ENODEV;
1192 
1193         /* FIXME: Locking */
1194         for (i = 0; i < NUM_URBS; ++i) {
1195                 if (mos7720_port->write_urb_pool[i] &&
1196                     mos7720_port->write_urb_pool[i]->status != -EINPROGRESS)
1197                         room += URB_TRANSFER_BUFFER_SIZE;
1198         }
1199 
1200         dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
1201         return room;
1202 }
1203 
1204 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port,
1205                                  const unsigned char *data, int count)
1206 {
1207         int status;
1208         int i;
1209         int bytes_sent = 0;
1210         int transfer_size;
1211 
1212         struct moschip_port *mos7720_port;
1213         struct usb_serial *serial;
1214         struct urb    *urb;
1215         const unsigned char *current_position = data;
1216 
1217         serial = port->serial;
1218 
1219         mos7720_port = usb_get_serial_port_data(port);
1220         if (mos7720_port == NULL)
1221                 return -ENODEV;
1222 
1223         /* try to find a free urb in the list */
1224         urb = NULL;
1225 
1226         for (i = 0; i < NUM_URBS; ++i) {
1227                 if (mos7720_port->write_urb_pool[i] &&
1228                     mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) {
1229                         urb = mos7720_port->write_urb_pool[i];
1230                         dev_dbg(&port->dev, "URB:%d\n", i);
1231                         break;
1232                 }
1233         }
1234 
1235         if (urb == NULL) {
1236                 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1237                 goto exit;
1238         }
1239 
1240         if (urb->transfer_buffer == NULL) {
1241                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1242                                                GFP_KERNEL);
1243                 if (!urb->transfer_buffer)
1244                         goto exit;
1245         }
1246         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1247 
1248         memcpy(urb->transfer_buffer, current_position, transfer_size);
1249         usb_serial_debug_data(&port->dev, __func__, transfer_size,
1250                               urb->transfer_buffer);
1251 
1252         /* fill urb with data and submit  */
1253         usb_fill_bulk_urb(urb, serial->dev,
1254                           usb_sndbulkpipe(serial->dev,
1255                                         port->bulk_out_endpointAddress),
1256                           urb->transfer_buffer, transfer_size,
1257                           mos7720_bulk_out_data_callback, mos7720_port);
1258 
1259         /* send it down the pipe */
1260         status = usb_submit_urb(urb, GFP_ATOMIC);
1261         if (status) {
1262                 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1263                         "with status = %d\n", __func__, status);
1264                 bytes_sent = status;
1265                 goto exit;
1266         }
1267         bytes_sent = transfer_size;
1268 
1269 exit:
1270         return bytes_sent;
1271 }
1272 
1273 static void mos7720_throttle(struct tty_struct *tty)
1274 {
1275         struct usb_serial_port *port = tty->driver_data;
1276         struct moschip_port *mos7720_port;
1277         int status;
1278 
1279         mos7720_port = usb_get_serial_port_data(port);
1280 
1281         if (mos7720_port == NULL)
1282                 return;
1283 
1284         if (!mos7720_port->open) {
1285                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1286                 return;
1287         }
1288 
1289         /* if we are implementing XON/XOFF, send the stop character */
1290         if (I_IXOFF(tty)) {
1291                 unsigned char stop_char = STOP_CHAR(tty);
1292                 status = mos7720_write(tty, port, &stop_char, 1);
1293                 if (status <= 0)
1294                         return;
1295         }
1296 
1297         /* if we are implementing RTS/CTS, toggle that line */
1298         if (tty->termios.c_cflag & CRTSCTS) {
1299                 mos7720_port->shadowMCR &= ~UART_MCR_RTS;
1300                 write_mos_reg(port->serial, port->port_number, MCR,
1301                               mos7720_port->shadowMCR);
1302                 if (status != 0)
1303                         return;
1304         }
1305 }
1306 
1307 static void mos7720_unthrottle(struct tty_struct *tty)
1308 {
1309         struct usb_serial_port *port = tty->driver_data;
1310         struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1311         int status;
1312 
1313         if (mos7720_port == NULL)
1314                 return;
1315 
1316         if (!mos7720_port->open) {
1317                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1318                 return;
1319         }
1320 
1321         /* if we are implementing XON/XOFF, send the start character */
1322         if (I_IXOFF(tty)) {
1323                 unsigned char start_char = START_CHAR(tty);
1324                 status = mos7720_write(tty, port, &start_char, 1);
1325                 if (status <= 0)
1326                         return;
1327         }
1328 
1329         /* if we are implementing RTS/CTS, toggle that line */
1330         if (tty->termios.c_cflag & CRTSCTS) {
1331                 mos7720_port->shadowMCR |= UART_MCR_RTS;
1332                 write_mos_reg(port->serial, port->port_number, MCR,
1333                               mos7720_port->shadowMCR);
1334                 if (status != 0)
1335                         return;
1336         }
1337 }
1338 
1339 /* FIXME: this function does not work */
1340 static int set_higher_rates(struct moschip_port *mos7720_port,
1341                             unsigned int baud)
1342 {
1343         struct usb_serial_port *port;
1344         struct usb_serial *serial;
1345         int port_number;
1346         enum mos_regs sp_reg;
1347         if (mos7720_port == NULL)
1348                 return -EINVAL;
1349 
1350         port = mos7720_port->port;
1351         serial = port->serial;
1352 
1353          /***********************************************
1354          *      Init Sequence for higher rates
1355          ***********************************************/
1356         dev_dbg(&port->dev, "Sending Setting Commands ..........\n");
1357         port_number = port->port_number;
1358 
1359         write_mos_reg(serial, port_number, IER, 0x00);
1360         write_mos_reg(serial, port_number, FCR, 0x00);
1361         write_mos_reg(serial, port_number, FCR, 0xcf);
1362         mos7720_port->shadowMCR = 0x0b;
1363         write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1364         write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x00);
1365 
1366         /***********************************************
1367          *              Set for higher rates           *
1368          ***********************************************/
1369         /* writing baud rate verbatum into uart clock field clearly not right */
1370         if (port_number == 0)
1371                 sp_reg = SP1_REG;
1372         else
1373                 sp_reg = SP2_REG;
1374         write_mos_reg(serial, dummy, sp_reg, baud * 0x10);
1375         write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x03);
1376         mos7720_port->shadowMCR = 0x2b;
1377         write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1378 
1379         /***********************************************
1380          *              Set DLL/DLM
1381          ***********************************************/
1382         mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1383         write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1384         write_mos_reg(serial, port_number, DLL, 0x01);
1385         write_mos_reg(serial, port_number, DLM, 0x00);
1386         mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1387         write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1388 
1389         return 0;
1390 }
1391 
1392 /* baud rate information */
1393 struct divisor_table_entry {
1394         __u32  baudrate;
1395         __u16  divisor;
1396 };
1397 
1398 /* Define table of divisors for moschip 7720 hardware      *
1399  * These assume a 3.6864MHz crystal, the standard /16, and *
1400  * MCR.7 = 0.                                              */
1401 static struct divisor_table_entry divisor_table[] = {
1402         {   50,         2304},
1403         {   110,        1047},  /* 2094.545455 => 230450   => .0217 % over */
1404         {   134,        857},   /* 1713.011152 => 230398.5 => .00065% under */
1405         {   150,        768},
1406         {   300,        384},
1407         {   600,        192},
1408         {   1200,       96},
1409         {   1800,       64},
1410         {   2400,       48},
1411         {   4800,       24},
1412         {   7200,       16},
1413         {   9600,       12},
1414         {   19200,      6},
1415         {   38400,      3},
1416         {   57600,      2},
1417         {   115200,     1},
1418 };
1419 
1420 /*****************************************************************************
1421  * calc_baud_rate_divisor
1422  *      this function calculates the proper baud rate divisor for the specified
1423  *      baud rate.
1424  *****************************************************************************/
1425 static int calc_baud_rate_divisor(struct usb_serial_port *port, int baudrate, int *divisor)
1426 {
1427         int i;
1428         __u16 custom;
1429         __u16 round1;
1430         __u16 round;
1431 
1432 
1433         dev_dbg(&port->dev, "%s - %d\n", __func__, baudrate);
1434 
1435         for (i = 0; i < ARRAY_SIZE(divisor_table); i++) {
1436                 if (divisor_table[i].baudrate == baudrate) {
1437                         *divisor = divisor_table[i].divisor;
1438                         return 0;
1439                 }
1440         }
1441 
1442         /* After trying for all the standard baud rates    *
1443          * Try calculating the divisor for this baud rate  */
1444         if (baudrate > 75 &&  baudrate < 230400) {
1445                 /* get the divisor */
1446                 custom = (__u16)(230400L  / baudrate);
1447 
1448                 /* Check for round off */
1449                 round1 = (__u16)(2304000L / baudrate);
1450                 round = (__u16)(round1 - (custom * 10));
1451                 if (round > 4)
1452                         custom++;
1453                 *divisor = custom;
1454 
1455                 dev_dbg(&port->dev, "Baud %d = %d\n", baudrate, custom);
1456                 return 0;
1457         }
1458 
1459         dev_dbg(&port->dev, "Baud calculation Failed...\n");
1460         return -EINVAL;
1461 }
1462 
1463 /*
1464  * send_cmd_write_baud_rate
1465  *      this function sends the proper command to change the baud rate of the
1466  *      specified port.
1467  */
1468 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port,
1469                                     int baudrate)
1470 {
1471         struct usb_serial_port *port;
1472         struct usb_serial *serial;
1473         int divisor;
1474         int status;
1475         unsigned char number;
1476 
1477         if (mos7720_port == NULL)
1478                 return -1;
1479 
1480         port = mos7720_port->port;
1481         serial = port->serial;
1482 
1483         number = port->port_number;
1484         dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudrate);
1485 
1486         /* Calculate the Divisor */
1487         status = calc_baud_rate_divisor(port, baudrate, &divisor);
1488         if (status) {
1489                 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1490                 return status;
1491         }
1492 
1493         /* Enable access to divisor latch */
1494         mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1495         write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR);
1496 
1497         /* Write the divisor */
1498         write_mos_reg(serial, number, DLL, (__u8)(divisor & 0xff));
1499         write_mos_reg(serial, number, DLM, (__u8)((divisor & 0xff00) >> 8));
1500 
1501         /* Disable access to divisor latch */
1502         mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1503         write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR);
1504 
1505         return status;
1506 }
1507 
1508 /*
1509  * change_port_settings
1510  *      This routine is called to set the UART on the device to match
1511  *      the specified new settings.
1512  */
1513 static void change_port_settings(struct tty_struct *tty,
1514                                  struct moschip_port *mos7720_port,
1515                                  struct ktermios *old_termios)
1516 {
1517         struct usb_serial_port *port;
1518         struct usb_serial *serial;
1519         int baud;
1520         unsigned cflag;
1521         unsigned iflag;
1522         __u8 mask = 0xff;
1523         __u8 lData;
1524         __u8 lParity;
1525         __u8 lStop;
1526         int status;
1527         int port_number;
1528 
1529         if (mos7720_port == NULL)
1530                 return ;
1531 
1532         port = mos7720_port->port;
1533         serial = port->serial;
1534         port_number = port->port_number;
1535 
1536         if (!mos7720_port->open) {
1537                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1538                 return;
1539         }
1540 
1541         lData = UART_LCR_WLEN8;
1542         lStop = 0x00;   /* 1 stop bit */
1543         lParity = 0x00; /* No parity */
1544 
1545         cflag = tty->termios.c_cflag;
1546         iflag = tty->termios.c_iflag;
1547 
1548         /* Change the number of bits */
1549         switch (cflag & CSIZE) {
1550         case CS5:
1551                 lData = UART_LCR_WLEN5;
1552                 mask = 0x1f;
1553                 break;
1554 
1555         case CS6:
1556                 lData = UART_LCR_WLEN6;
1557                 mask = 0x3f;
1558                 break;
1559 
1560         case CS7:
1561                 lData = UART_LCR_WLEN7;
1562                 mask = 0x7f;
1563                 break;
1564         default:
1565         case CS8:
1566                 lData = UART_LCR_WLEN8;
1567                 break;
1568         }
1569 
1570         /* Change the Parity bit */
1571         if (cflag & PARENB) {
1572                 if (cflag & PARODD) {
1573                         lParity = UART_LCR_PARITY;
1574                         dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1575                 } else {
1576                         lParity = (UART_LCR_EPAR | UART_LCR_PARITY);
1577                         dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1578                 }
1579 
1580         } else {
1581                 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1582         }
1583 
1584         if (cflag & CMSPAR)
1585                 lParity = lParity | 0x20;
1586 
1587         /* Change the Stop bit */
1588         if (cflag & CSTOPB) {
1589                 lStop = UART_LCR_STOP;
1590                 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1591         } else {
1592                 lStop = 0x00;
1593                 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1594         }
1595 
1596 #define LCR_BITS_MASK           0x03    /* Mask for bits/char field */
1597 #define LCR_STOP_MASK           0x04    /* Mask for stop bits field */
1598 #define LCR_PAR_MASK            0x38    /* Mask for parity field */
1599 
1600         /* Update the LCR with the correct value */
1601         mos7720_port->shadowLCR &=
1602                 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1603         mos7720_port->shadowLCR |= (lData | lParity | lStop);
1604 
1605 
1606         /* Disable Interrupts */
1607         write_mos_reg(serial, port_number, IER, 0x00);
1608         write_mos_reg(serial, port_number, FCR, 0x00);
1609         write_mos_reg(serial, port_number, FCR, 0xcf);
1610 
1611         /* Send the updated LCR value to the mos7720 */
1612         write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1613         mos7720_port->shadowMCR = 0x0b;
1614         write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1615 
1616         /* set up the MCR register and send it to the mos7720 */
1617         mos7720_port->shadowMCR = UART_MCR_OUT2;
1618         if (cflag & CBAUD)
1619                 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS);
1620 
1621         if (cflag & CRTSCTS) {
1622                 mos7720_port->shadowMCR |= (UART_MCR_XONANY);
1623                 /* To set hardware flow control to the specified *
1624                  * serial port, in SP1/2_CONTROL_REG             */
1625                 if (port_number)
1626                         write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x01);
1627                 else
1628                         write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x02);
1629 
1630         } else
1631                 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY);
1632 
1633         write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1634 
1635         /* Determine divisor based on baud rate */
1636         baud = tty_get_baud_rate(tty);
1637         if (!baud) {
1638                 /* pick a default, any default... */
1639                 dev_dbg(&port->dev, "Picked default baud...\n");
1640                 baud = 9600;
1641         }
1642 
1643         if (baud >= 230400) {
1644                 set_higher_rates(mos7720_port, baud);
1645                 /* Enable Interrupts */
1646                 write_mos_reg(serial, port_number, IER, 0x0c);
1647                 return;
1648         }
1649 
1650         dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1651         status = send_cmd_write_baud_rate(mos7720_port, baud);
1652         /* FIXME: needs to write actual resulting baud back not just
1653            blindly do so */
1654         if (cflag & CBAUD)
1655                 tty_encode_baud_rate(tty, baud, baud);
1656         /* Enable Interrupts */
1657         write_mos_reg(serial, port_number, IER, 0x0c);
1658 
1659         if (port->read_urb->status != -EINPROGRESS) {
1660                 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1661                 if (status)
1662                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status);
1663         }
1664 }
1665 
1666 /*
1667  * mos7720_set_termios
1668  *      this function is called by the tty driver when it wants to change the
1669  *      termios structure.
1670  */
1671 static void mos7720_set_termios(struct tty_struct *tty,
1672                 struct usb_serial_port *port, struct ktermios *old_termios)
1673 {
1674         int status;
1675         unsigned int cflag;
1676         struct usb_serial *serial;
1677         struct moschip_port *mos7720_port;
1678 
1679         serial = port->serial;
1680 
1681         mos7720_port = usb_get_serial_port_data(port);
1682 
1683         if (mos7720_port == NULL)
1684                 return;
1685 
1686         if (!mos7720_port->open) {
1687                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1688                 return;
1689         }
1690 
1691         dev_dbg(&port->dev, "setting termios - ASPIRE\n");
1692 
1693         cflag = tty->termios.c_cflag;
1694 
1695         dev_dbg(&port->dev, "%s - cflag %08x iflag %08x\n", __func__,
1696                 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
1697 
1698         dev_dbg(&port->dev, "%s - old cflag %08x old iflag %08x\n", __func__,
1699                 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
1700 
1701         /* change the port settings to the new ones specified */
1702         change_port_settings(tty, mos7720_port, old_termios);
1703 
1704         if (port->read_urb->status != -EINPROGRESS) {
1705                 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1706                 if (status)
1707                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status);
1708         }
1709 }
1710 
1711 /*
1712  * get_lsr_info - get line status register info
1713  *
1714  * Purpose: Let user call ioctl() to get info when the UART physically
1715  *          is emptied.  On bus types like RS485, the transmitter must
1716  *          release the bus after transmitting. This must be done when
1717  *          the transmit shift register is empty, not be done when the
1718  *          transmit holding register is empty.  This functionality
1719  *          allows an RS485 driver to be written in user space.
1720  */
1721 static int get_lsr_info(struct tty_struct *tty,
1722                 struct moschip_port *mos7720_port, unsigned int __user *value)
1723 {
1724         struct usb_serial_port *port = tty->driver_data;
1725         unsigned int result = 0;
1726         unsigned char data = 0;
1727         int port_number = port->port_number;
1728         int count;
1729 
1730         count = mos7720_chars_in_buffer(tty);
1731         if (count == 0) {
1732                 read_mos_reg(port->serial, port_number, LSR, &data);
1733                 if ((data & (UART_LSR_TEMT | UART_LSR_THRE))
1734                                         == (UART_LSR_TEMT | UART_LSR_THRE)) {
1735                         dev_dbg(&port->dev, "%s -- Empty\n", __func__);
1736                         result = TIOCSER_TEMT;
1737                 }
1738         }
1739         if (copy_to_user(value, &result, sizeof(int)))
1740                 return -EFAULT;
1741         return 0;
1742 }
1743 
1744 static int mos7720_tiocmget(struct tty_struct *tty)
1745 {
1746         struct usb_serial_port *port = tty->driver_data;
1747         struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1748         unsigned int result = 0;
1749         unsigned int mcr ;
1750         unsigned int msr ;
1751 
1752         mcr = mos7720_port->shadowMCR;
1753         msr = mos7720_port->shadowMSR;
1754 
1755         result = ((mcr & UART_MCR_DTR)  ? TIOCM_DTR : 0)   /* 0x002 */
1756           | ((mcr & UART_MCR_RTS)   ? TIOCM_RTS : 0)   /* 0x004 */
1757           | ((msr & UART_MSR_CTS)   ? TIOCM_CTS : 0)   /* 0x020 */
1758           | ((msr & UART_MSR_DCD)   ? TIOCM_CAR : 0)   /* 0x040 */
1759           | ((msr & UART_MSR_RI)    ? TIOCM_RI :  0)   /* 0x080 */
1760           | ((msr & UART_MSR_DSR)   ? TIOCM_DSR : 0);  /* 0x100 */
1761 
1762         return result;
1763 }
1764 
1765 static int mos7720_tiocmset(struct tty_struct *tty,
1766                             unsigned int set, unsigned int clear)
1767 {
1768         struct usb_serial_port *port = tty->driver_data;
1769         struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1770         unsigned int mcr ;
1771 
1772         mcr = mos7720_port->shadowMCR;
1773 
1774         if (set & TIOCM_RTS)
1775                 mcr |= UART_MCR_RTS;
1776         if (set & TIOCM_DTR)
1777                 mcr |= UART_MCR_DTR;
1778         if (set & TIOCM_LOOP)
1779                 mcr |= UART_MCR_LOOP;
1780 
1781         if (clear & TIOCM_RTS)
1782                 mcr &= ~UART_MCR_RTS;
1783         if (clear & TIOCM_DTR)
1784                 mcr &= ~UART_MCR_DTR;
1785         if (clear & TIOCM_LOOP)
1786                 mcr &= ~UART_MCR_LOOP;
1787 
1788         mos7720_port->shadowMCR = mcr;
1789         write_mos_reg(port->serial, port->port_number, MCR,
1790                       mos7720_port->shadowMCR);
1791 
1792         return 0;
1793 }
1794 
1795 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd,
1796                           unsigned int __user *value)
1797 {
1798         unsigned int mcr;
1799         unsigned int arg;
1800 
1801         struct usb_serial_port *port;
1802 
1803         if (mos7720_port == NULL)
1804                 return -1;
1805 
1806         port = (struct usb_serial_port *)mos7720_port->port;
1807         mcr = mos7720_port->shadowMCR;
1808 
1809         if (copy_from_user(&arg, value, sizeof(int)))
1810                 return -EFAULT;
1811 
1812         switch (cmd) {
1813         case TIOCMBIS:
1814                 if (arg & TIOCM_RTS)
1815                         mcr |= UART_MCR_RTS;
1816                 if (arg & TIOCM_DTR)
1817                         mcr |= UART_MCR_RTS;
1818                 if (arg & TIOCM_LOOP)
1819                         mcr |= UART_MCR_LOOP;
1820                 break;
1821 
1822         case TIOCMBIC:
1823                 if (arg & TIOCM_RTS)
1824                         mcr &= ~UART_MCR_RTS;
1825                 if (arg & TIOCM_DTR)
1826                         mcr &= ~UART_MCR_RTS;
1827                 if (arg & TIOCM_LOOP)
1828                         mcr &= ~UART_MCR_LOOP;
1829                 break;
1830 
1831         }
1832 
1833         mos7720_port->shadowMCR = mcr;
1834         write_mos_reg(port->serial, port->port_number, MCR,
1835                       mos7720_port->shadowMCR);
1836 
1837         return 0;
1838 }
1839 
1840 static int get_serial_info(struct moschip_port *mos7720_port,
1841                            struct serial_struct __user *retinfo)
1842 {
1843         struct serial_struct tmp;
1844 
1845         if (!retinfo)
1846                 return -EFAULT;
1847 
1848         memset(&tmp, 0, sizeof(tmp));
1849 
1850         tmp.type                = PORT_16550A;
1851         tmp.line                = mos7720_port->port->minor;
1852         tmp.port                = mos7720_port->port->port_number;
1853         tmp.irq                 = 0;
1854         tmp.flags               = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
1855         tmp.xmit_fifo_size      = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1856         tmp.baud_base           = 9600;
1857         tmp.close_delay         = 5*HZ;
1858         tmp.closing_wait        = 30*HZ;
1859 
1860         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1861                 return -EFAULT;
1862         return 0;
1863 }
1864 
1865 static int mos7720_ioctl(struct tty_struct *tty,
1866                          unsigned int cmd, unsigned long arg)
1867 {
1868         struct usb_serial_port *port = tty->driver_data;
1869         struct moschip_port *mos7720_port;
1870 
1871         mos7720_port = usb_get_serial_port_data(port);
1872         if (mos7720_port == NULL)
1873                 return -ENODEV;
1874 
1875         switch (cmd) {
1876         case TIOCSERGETLSR:
1877                 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
1878                 return get_lsr_info(tty, mos7720_port,
1879                                         (unsigned int __user *)arg);
1880 
1881         /* FIXME: These should be using the mode methods */
1882         case TIOCMBIS:
1883         case TIOCMBIC:
1884                 dev_dbg(&port->dev, "%s TIOCMSET/TIOCMBIC/TIOCMSET\n", __func__);
1885                 return set_modem_info(mos7720_port, cmd,
1886                                       (unsigned int __user *)arg);
1887 
1888         case TIOCGSERIAL:
1889                 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
1890                 return get_serial_info(mos7720_port,
1891                                        (struct serial_struct __user *)arg);
1892         }
1893 
1894         return -ENOIOCTLCMD;
1895 }
1896 
1897 static int mos7720_startup(struct usb_serial *serial)
1898 {
1899         struct usb_device *dev;
1900         char data;
1901         u16 product;
1902         int ret_val;
1903 
1904         product = le16_to_cpu(serial->dev->descriptor.idProduct);
1905         dev = serial->dev;
1906 
1907         /*
1908          * The 7715 uses the first bulk in/out endpoint pair for the parallel
1909          * port, and the second for the serial port.  Because the usbserial core
1910          * assumes both pairs are serial ports, we must engage in a bit of
1911          * subterfuge and swap the pointers for ports 0 and 1 in order to make
1912          * port 0 point to the serial port.  However, both moschip devices use a
1913          * single interrupt-in endpoint for both ports (as mentioned a little
1914          * further down), and this endpoint was assigned to port 0.  So after
1915          * the swap, we must copy the interrupt endpoint elements from port 1
1916          * (as newly assigned) to port 0, and null out port 1 pointers.
1917          */
1918         if (product == MOSCHIP_DEVICE_ID_7715) {
1919                 struct usb_serial_port *tmp = serial->port[0];
1920                 serial->port[0] = serial->port[1];
1921                 serial->port[1] = tmp;
1922                 serial->port[0]->interrupt_in_urb = tmp->interrupt_in_urb;
1923                 serial->port[0]->interrupt_in_buffer = tmp->interrupt_in_buffer;
1924                 serial->port[0]->interrupt_in_endpointAddress =
1925                         tmp->interrupt_in_endpointAddress;
1926                 serial->port[1]->interrupt_in_urb = NULL;
1927                 serial->port[1]->interrupt_in_buffer = NULL;
1928         }
1929 
1930         /* setting configuration feature to one */
1931         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1932                         (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5000);
1933 
1934         /* start the interrupt urb */
1935         ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL);
1936         if (ret_val)
1937                 dev_err(&dev->dev,
1938                         "%s - Error %d submitting control urb\n",
1939                         __func__, ret_val);
1940 
1941 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
1942         if (product == MOSCHIP_DEVICE_ID_7715) {
1943                 ret_val = mos7715_parport_init(serial);
1944                 if (ret_val < 0)
1945                         return ret_val;
1946         }
1947 #endif
1948         /* LSR For Port 1 */
1949         read_mos_reg(serial, 0, LSR, &data);
1950         dev_dbg(&dev->dev, "LSR:%x\n", data);
1951 
1952         return 0;
1953 }
1954 
1955 static void mos7720_release(struct usb_serial *serial)
1956 {
1957 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
1958         /* close the parallel port */
1959 
1960         if (le16_to_cpu(serial->dev->descriptor.idProduct)
1961             == MOSCHIP_DEVICE_ID_7715) {
1962                 struct urbtracker *urbtrack;
1963                 unsigned long flags;
1964                 struct mos7715_parport *mos_parport =
1965                         usb_get_serial_data(serial);
1966 
1967                 /* prevent NULL ptr dereference in port callbacks */
1968                 spin_lock(&release_lock);
1969                 mos_parport->pp->private_data = NULL;
1970                 spin_unlock(&release_lock);
1971 
1972                 /* wait for synchronous usb calls to return */
1973                 if (mos_parport->msg_pending)
1974                         wait_for_completion_timeout(&mos_parport->syncmsg_compl,
1975                                             msecs_to_jiffies(MOS_WDR_TIMEOUT));
1976 
1977                 parport_remove_port(mos_parport->pp);
1978                 usb_set_serial_data(serial, NULL);
1979                 mos_parport->serial = NULL;
1980 
1981                 /* if tasklet currently scheduled, wait for it to complete */
1982                 tasklet_kill(&mos_parport->urb_tasklet);
1983 
1984                 /* unlink any urbs sent by the tasklet  */
1985                 spin_lock_irqsave(&mos_parport->listlock, flags);
1986                 list_for_each_entry(urbtrack,
1987                                     &mos_parport->active_urbs,
1988                                     urblist_entry)
1989                         usb_unlink_urb(urbtrack->urb);
1990                 spin_unlock_irqrestore(&mos_parport->listlock, flags);
1991 
1992                 kref_put(&mos_parport->ref_count, destroy_mos_parport);
1993         }
1994 #endif
1995 }
1996 
1997 static int mos7720_port_probe(struct usb_serial_port *port)
1998 {
1999         struct moschip_port *mos7720_port;
2000 
2001         mos7720_port = kzalloc(sizeof(*mos7720_port), GFP_KERNEL);
2002         if (!mos7720_port)
2003                 return -ENOMEM;
2004 
2005         /* Initialize all port interrupt end point to port 0 int endpoint.
2006          * Our device has only one interrupt endpoint common to all ports.
2007          */
2008         port->interrupt_in_endpointAddress =
2009                 port->serial->port[0]->interrupt_in_endpointAddress;
2010         mos7720_port->port = port;
2011 
2012         usb_set_serial_port_data(port, mos7720_port);
2013 
2014         return 0;
2015 }
2016 
2017 static int mos7720_port_remove(struct usb_serial_port *port)
2018 {
2019         struct moschip_port *mos7720_port;
2020 
2021         mos7720_port = usb_get_serial_port_data(port);
2022         kfree(mos7720_port);
2023 
2024         return 0;
2025 }
2026 
2027 static struct usb_serial_driver moschip7720_2port_driver = {
2028         .driver = {
2029                 .owner =        THIS_MODULE,
2030                 .name =         "moschip7720",
2031         },
2032         .description            = "Moschip 2 port adapter",
2033         .id_table               = id_table,
2034         .calc_num_ports         = mos77xx_calc_num_ports,
2035         .open                   = mos7720_open,
2036         .close                  = mos7720_close,
2037         .throttle               = mos7720_throttle,
2038         .unthrottle             = mos7720_unthrottle,
2039         .probe                  = mos77xx_probe,
2040         .attach                 = mos7720_startup,
2041         .release                = mos7720_release,
2042         .port_probe             = mos7720_port_probe,
2043         .port_remove            = mos7720_port_remove,
2044         .ioctl                  = mos7720_ioctl,
2045         .tiocmget               = mos7720_tiocmget,
2046         .tiocmset               = mos7720_tiocmset,
2047         .set_termios            = mos7720_set_termios,
2048         .write                  = mos7720_write,
2049         .write_room             = mos7720_write_room,
2050         .chars_in_buffer        = mos7720_chars_in_buffer,
2051         .break_ctl              = mos7720_break,
2052         .read_bulk_callback     = mos7720_bulk_in_callback,
2053         .read_int_callback      = NULL  /* dynamically assigned in probe() */
2054 };
2055 
2056 static struct usb_serial_driver * const serial_drivers[] = {
2057         &moschip7720_2port_driver, NULL
2058 };
2059 
2060 module_usb_serial_driver(serial_drivers, id_table);
2061 
2062 MODULE_AUTHOR(DRIVER_AUTHOR);
2063 MODULE_DESCRIPTION(DRIVER_DESC);
2064 MODULE_LICENSE("GPL");
2065 

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