Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

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 #define USB_VENDOR_ID_MOSCHIP           0x9710
 69 #define MOSCHIP_DEVICE_ID_7720          0x7720
 70 #define MOSCHIP_DEVICE_ID_7715          0x7715
 71 
 72 static const struct usb_device_id id_table[] = {
 73         { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7720) },
 74         { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7715) },
 75         { } /* terminating entry */
 76 };
 77 MODULE_DEVICE_TABLE(usb, id_table);
 78 
 79 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
 80 
 81 /* initial values for parport regs */
 82 #define DCR_INIT_VAL       0x0c /* SLCTIN, nINIT */
 83 #define ECR_INIT_VAL       0x00 /* SPP mode */
 84 
 85 struct urbtracker {
 86         struct mos7715_parport  *mos_parport;
 87         struct list_head        urblist_entry;
 88         struct kref             ref_count;
 89         struct urb              *urb;
 90         struct usb_ctrlrequest  *setup;
 91 };
 92 
 93 enum mos7715_pp_modes {
 94         SPP = 0<<5,
 95         PS2 = 1<<5,      /* moschip calls this 'NIBBLE' mode */
 96         PPF = 2<<5,      /* moschip calls this 'CB-FIFO mode */
 97 };
 98 
 99 struct mos7715_parport {
100         struct parport          *pp;           /* back to containing struct */
101         struct kref             ref_count;     /* to instance of this struct */
102         struct list_head        deferred_urbs; /* list deferred async urbs */
103         struct list_head        active_urbs;   /* list async urbs in flight */
104         spinlock_t              listlock;      /* protects list access */
105         bool                    msg_pending;   /* usb sync call pending */
106         struct completion       syncmsg_compl; /* usb sync call completed */
107         struct tasklet_struct   urb_tasklet;   /* for sending deferred urbs */
108         struct usb_serial       *serial;       /* back to containing struct */
109         __u8                    shadowECR;     /* parallel port regs... */
110         __u8                    shadowDCR;
111         atomic_t                shadowDSR;     /* updated in int-in callback */
112 };
113 
114 /* lock guards against dereferencing NULL ptr in parport ops callbacks */
115 static DEFINE_SPINLOCK(release_lock);
116 
117 #endif  /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
118 
119 static const unsigned int dummy; /* for clarity in register access fns */
120 
121 enum mos_regs {
122         MOS7720_THR,              /* serial port regs */
123         MOS7720_RHR,
124         MOS7720_IER,
125         MOS7720_FCR,
126         MOS7720_ISR,
127         MOS7720_LCR,
128         MOS7720_MCR,
129         MOS7720_LSR,
130         MOS7720_MSR,
131         MOS7720_SPR,
132         MOS7720_DLL,
133         MOS7720_DLM,
134         MOS7720_DPR,              /* parallel port regs */
135         MOS7720_DSR,
136         MOS7720_DCR,
137         MOS7720_ECR,
138         MOS7720_SP1_REG,          /* device control regs */
139         MOS7720_SP2_REG,          /* serial port 2 (7720 only) */
140         MOS7720_PP_REG,
141         MOS7720_SP_CONTROL_REG,
142 };
143 
144 /*
145  * Return the correct value for the Windex field of the setup packet
146  * for a control endpoint message.  See the 7715 datasheet.
147  */
148 static inline __u16 get_reg_index(enum mos_regs reg)
149 {
150         static const __u16 mos7715_index_lookup_table[] = {
151                 0x00,           /* MOS7720_THR */
152                 0x00,           /* MOS7720_RHR */
153                 0x01,           /* MOS7720_IER */
154                 0x02,           /* MOS7720_FCR */
155                 0x02,           /* MOS7720_ISR */
156                 0x03,           /* MOS7720_LCR */
157                 0x04,           /* MOS7720_MCR */
158                 0x05,           /* MOS7720_LSR */
159                 0x06,           /* MOS7720_MSR */
160                 0x07,           /* MOS7720_SPR */
161                 0x00,           /* MOS7720_DLL */
162                 0x01,           /* MOS7720_DLM */
163                 0x00,           /* MOS7720_DPR */
164                 0x01,           /* MOS7720_DSR */
165                 0x02,           /* MOS7720_DCR */
166                 0x0a,           /* MOS7720_ECR */
167                 0x01,           /* MOS7720_SP1_REG */
168                 0x02,           /* MOS7720_SP2_REG (7720 only) */
169                 0x04,           /* MOS7720_PP_REG (7715 only) */
170                 0x08,           /* MOS7720_SP_CONTROL_REG */
171         };
172         return mos7715_index_lookup_table[reg];
173 }
174 
175 /*
176  * Return the correct value for the upper byte of the Wvalue field of
177  * the setup packet for a control endpoint message.
178  */
179 static inline __u16 get_reg_value(enum mos_regs reg,
180                                   unsigned int serial_portnum)
181 {
182         if (reg >= MOS7720_SP1_REG)     /* control reg */
183                 return 0x0000;
184 
185         else if (reg >= MOS7720_DPR)    /* parallel port reg (7715 only) */
186                 return 0x0100;
187 
188         else                          /* serial port reg */
189                 return (serial_portnum + 2) << 8;
190 }
191 
192 /*
193  * Write data byte to the specified device register.  The data is embedded in
194  * the value field of the setup packet. serial_portnum is ignored for registers
195  * not specific to a particular serial port.
196  */
197 static int write_mos_reg(struct usb_serial *serial, unsigned int serial_portnum,
198                          enum mos_regs reg, __u8 data)
199 {
200         struct usb_device *usbdev = serial->dev;
201         unsigned int pipe = usb_sndctrlpipe(usbdev, 0);
202         __u8 request = (__u8)0x0e;
203         __u8 requesttype = (__u8)0x40;
204         __u16 index = get_reg_index(reg);
205         __u16 value = get_reg_value(reg, serial_portnum) + data;
206         int status = usb_control_msg(usbdev, pipe, request, requesttype, value,
207                                      index, NULL, 0, MOS_WDR_TIMEOUT);
208         if (status < 0)
209                 dev_err(&usbdev->dev,
210                         "mos7720: usb_control_msg() failed: %d\n", status);
211         return status;
212 }
213 
214 /*
215  * Read data byte from the specified device register.  The data returned by the
216  * device is embedded in the value field of the setup packet.  serial_portnum is
217  * ignored for registers that are not specific to a particular serial port.
218  */
219 static int read_mos_reg(struct usb_serial *serial, unsigned int serial_portnum,
220                         enum mos_regs reg, __u8 *data)
221 {
222         struct usb_device *usbdev = serial->dev;
223         unsigned int pipe = usb_rcvctrlpipe(usbdev, 0);
224         __u8 request = (__u8)0x0d;
225         __u8 requesttype = (__u8)0xc0;
226         __u16 index = get_reg_index(reg);
227         __u16 value = get_reg_value(reg, serial_portnum);
228         u8 *buf;
229         int status;
230 
231         buf = kmalloc(1, GFP_KERNEL);
232         if (!buf)
233                 return -ENOMEM;
234 
235         status = usb_control_msg(usbdev, pipe, request, requesttype, value,
236                                      index, buf, 1, MOS_WDR_TIMEOUT);
237         if (status == 1)
238                 *data = *buf;
239         else if (status < 0)
240                 dev_err(&usbdev->dev,
241                         "mos7720: usb_control_msg() failed: %d\n", status);
242         kfree(buf);
243 
244         return status;
245 }
246 
247 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
248 
249 static inline int mos7715_change_mode(struct mos7715_parport *mos_parport,
250                                       enum mos7715_pp_modes mode)
251 {
252         mos_parport->shadowECR = mode;
253         write_mos_reg(mos_parport->serial, dummy, MOS7720_ECR,
254                       mos_parport->shadowECR);
255         return 0;
256 }
257 
258 static void destroy_mos_parport(struct kref *kref)
259 {
260         struct mos7715_parport *mos_parport =
261                 container_of(kref, struct mos7715_parport, ref_count);
262 
263         kfree(mos_parport);
264 }
265 
266 static void destroy_urbtracker(struct kref *kref)
267 {
268         struct urbtracker *urbtrack =
269                 container_of(kref, struct urbtracker, ref_count);
270         struct mos7715_parport *mos_parport = urbtrack->mos_parport;
271 
272         usb_free_urb(urbtrack->urb);
273         kfree(urbtrack->setup);
274         kfree(urbtrack);
275         kref_put(&mos_parport->ref_count, destroy_mos_parport);
276 }
277 
278 /*
279  * This runs as a tasklet when sending an urb in a non-blocking parallel
280  * port callback had to be deferred because the disconnect mutex could not be
281  * obtained at the time.
282  */
283 static void send_deferred_urbs(unsigned long _mos_parport)
284 {
285         int ret_val;
286         unsigned long flags;
287         struct mos7715_parport *mos_parport = (void *)_mos_parport;
288         struct urbtracker *urbtrack, *tmp;
289         struct list_head *cursor, *next;
290         struct device *dev;
291 
292         /* if release function ran, game over */
293         if (unlikely(mos_parport->serial == NULL))
294                 return;
295 
296         dev = &mos_parport->serial->dev->dev;
297 
298         /* try again to get the mutex */
299         if (!mutex_trylock(&mos_parport->serial->disc_mutex)) {
300                 dev_dbg(dev, "%s: rescheduling tasklet\n", __func__);
301                 tasklet_schedule(&mos_parport->urb_tasklet);
302                 return;
303         }
304 
305         /* if device disconnected, game over */
306         if (unlikely(mos_parport->serial->disconnected)) {
307                 mutex_unlock(&mos_parport->serial->disc_mutex);
308                 return;
309         }
310 
311         spin_lock_irqsave(&mos_parport->listlock, flags);
312         if (list_empty(&mos_parport->deferred_urbs)) {
313                 spin_unlock_irqrestore(&mos_parport->listlock, flags);
314                 mutex_unlock(&mos_parport->serial->disc_mutex);
315                 dev_dbg(dev, "%s: deferred_urbs list empty\n", __func__);
316                 return;
317         }
318 
319         /* move contents of deferred_urbs list to active_urbs list and submit */
320         list_for_each_safe(cursor, next, &mos_parport->deferred_urbs)
321                 list_move_tail(cursor, &mos_parport->active_urbs);
322         list_for_each_entry_safe(urbtrack, tmp, &mos_parport->active_urbs,
323                             urblist_entry) {
324                 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
325                 dev_dbg(dev, "%s: urb submitted\n", __func__);
326                 if (ret_val) {
327                         dev_err(dev, "usb_submit_urb() failed: %d\n", ret_val);
328                         list_del(&urbtrack->urblist_entry);
329                         kref_put(&urbtrack->ref_count, destroy_urbtracker);
330                 }
331         }
332         spin_unlock_irqrestore(&mos_parport->listlock, flags);
333         mutex_unlock(&mos_parport->serial->disc_mutex);
334 }
335 
336 /* callback for parallel port control urbs submitted asynchronously */
337 static void async_complete(struct urb *urb)
338 {
339         struct urbtracker *urbtrack = urb->context;
340         int status = urb->status;
341 
342         if (unlikely(status))
343                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n", __func__, status);
344 
345         /* remove the urbtracker from the active_urbs list */
346         spin_lock(&urbtrack->mos_parport->listlock);
347         list_del(&urbtrack->urblist_entry);
348         spin_unlock(&urbtrack->mos_parport->listlock);
349         kref_put(&urbtrack->ref_count, destroy_urbtracker);
350 }
351 
352 static int write_parport_reg_nonblock(struct mos7715_parport *mos_parport,
353                                       enum mos_regs reg, __u8 data)
354 {
355         struct urbtracker *urbtrack;
356         int ret_val;
357         unsigned long flags;
358         struct usb_serial *serial = mos_parport->serial;
359         struct usb_device *usbdev = serial->dev;
360 
361         /* create and initialize the control urb and containing urbtracker */
362         urbtrack = kmalloc(sizeof(struct urbtracker), GFP_ATOMIC);
363         if (!urbtrack)
364                 return -ENOMEM;
365 
366         kref_get(&mos_parport->ref_count);
367         urbtrack->mos_parport = mos_parport;
368         urbtrack->urb = usb_alloc_urb(0, GFP_ATOMIC);
369         if (!urbtrack->urb) {
370                 kfree(urbtrack);
371                 return -ENOMEM;
372         }
373         urbtrack->setup = kmalloc(sizeof(*urbtrack->setup), GFP_ATOMIC);
374         if (!urbtrack->setup) {
375                 usb_free_urb(urbtrack->urb);
376                 kfree(urbtrack);
377                 return -ENOMEM;
378         }
379         urbtrack->setup->bRequestType = (__u8)0x40;
380         urbtrack->setup->bRequest = (__u8)0x0e;
381         urbtrack->setup->wValue = cpu_to_le16(get_reg_value(reg, dummy));
382         urbtrack->setup->wIndex = cpu_to_le16(get_reg_index(reg));
383         urbtrack->setup->wLength = 0;
384         usb_fill_control_urb(urbtrack->urb, usbdev,
385                              usb_sndctrlpipe(usbdev, 0),
386                              (unsigned char *)urbtrack->setup,
387                              NULL, 0, async_complete, urbtrack);
388         kref_init(&urbtrack->ref_count);
389         INIT_LIST_HEAD(&urbtrack->urblist_entry);
390 
391         /*
392          * get the disconnect mutex, or add tracker to the deferred_urbs list
393          * and schedule a tasklet to try again later
394          */
395         if (!mutex_trylock(&serial->disc_mutex)) {
396                 spin_lock_irqsave(&mos_parport->listlock, flags);
397                 list_add_tail(&urbtrack->urblist_entry,
398                               &mos_parport->deferred_urbs);
399                 spin_unlock_irqrestore(&mos_parport->listlock, flags);
400                 tasklet_schedule(&mos_parport->urb_tasklet);
401                 dev_dbg(&usbdev->dev, "tasklet scheduled\n");
402                 return 0;
403         }
404 
405         /* bail if device disconnected */
406         if (serial->disconnected) {
407                 kref_put(&urbtrack->ref_count, destroy_urbtracker);
408                 mutex_unlock(&serial->disc_mutex);
409                 return -ENODEV;
410         }
411 
412         /* add the tracker to the active_urbs list and submit */
413         spin_lock_irqsave(&mos_parport->listlock, flags);
414         list_add_tail(&urbtrack->urblist_entry, &mos_parport->active_urbs);
415         spin_unlock_irqrestore(&mos_parport->listlock, flags);
416         ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
417         mutex_unlock(&serial->disc_mutex);
418         if (ret_val) {
419                 dev_err(&usbdev->dev,
420                         "%s: submit_urb() failed: %d\n", __func__, ret_val);
421                 spin_lock_irqsave(&mos_parport->listlock, flags);
422                 list_del(&urbtrack->urblist_entry);
423                 spin_unlock_irqrestore(&mos_parport->listlock, flags);
424                 kref_put(&urbtrack->ref_count, destroy_urbtracker);
425                 return ret_val;
426         }
427         return 0;
428 }
429 
430 /*
431  * This is the the common top part of all parallel port callback operations that
432  * send synchronous messages to the device.  This implements convoluted locking
433  * that avoids two scenarios: (1) a port operation is called after usbserial
434  * has called our release function, at which point struct mos7715_parport has
435  * been destroyed, and (2) the device has been disconnected, but usbserial has
436  * not called the release function yet because someone has a serial port open.
437  * The shared release_lock prevents the first, and the mutex and disconnected
438  * flag maintained by usbserial covers the second.  We also use the msg_pending
439  * flag to ensure that all synchronous usb message calls have completed before
440  * our release function can return.
441  */
442 static int parport_prologue(struct parport *pp)
443 {
444         struct mos7715_parport *mos_parport;
445 
446         spin_lock(&release_lock);
447         mos_parport = pp->private_data;
448         if (unlikely(mos_parport == NULL)) {
449                 /* release fn called, port struct destroyed */
450                 spin_unlock(&release_lock);
451                 return -1;
452         }
453         mos_parport->msg_pending = true;   /* synch usb call pending */
454         reinit_completion(&mos_parport->syncmsg_compl);
455         spin_unlock(&release_lock);
456 
457         mutex_lock(&mos_parport->serial->disc_mutex);
458         if (mos_parport->serial->disconnected) {
459                 /* device disconnected */
460                 mutex_unlock(&mos_parport->serial->disc_mutex);
461                 mos_parport->msg_pending = false;
462                 complete(&mos_parport->syncmsg_compl);
463                 return -1;
464         }
465 
466         return 0;
467 }
468 
469 /*
470  * This is the common bottom part of all parallel port functions that send
471  * synchronous messages to the device.
472  */
473 static inline void parport_epilogue(struct parport *pp)
474 {
475         struct mos7715_parport *mos_parport = pp->private_data;
476         mutex_unlock(&mos_parport->serial->disc_mutex);
477         mos_parport->msg_pending = false;
478         complete(&mos_parport->syncmsg_compl);
479 }
480 
481 static void parport_mos7715_write_data(struct parport *pp, unsigned char d)
482 {
483         struct mos7715_parport *mos_parport = pp->private_data;
484 
485         if (parport_prologue(pp) < 0)
486                 return;
487         mos7715_change_mode(mos_parport, SPP);
488         write_mos_reg(mos_parport->serial, dummy, MOS7720_DPR, (__u8)d);
489         parport_epilogue(pp);
490 }
491 
492 static unsigned char parport_mos7715_read_data(struct parport *pp)
493 {
494         struct mos7715_parport *mos_parport = pp->private_data;
495         unsigned char d;
496 
497         if (parport_prologue(pp) < 0)
498                 return 0;
499         read_mos_reg(mos_parport->serial, dummy, MOS7720_DPR, &d);
500         parport_epilogue(pp);
501         return d;
502 }
503 
504 static void parport_mos7715_write_control(struct parport *pp, unsigned char d)
505 {
506         struct mos7715_parport *mos_parport = pp->private_data;
507         __u8 data;
508 
509         if (parport_prologue(pp) < 0)
510                 return;
511         data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0);
512         write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, data);
513         mos_parport->shadowDCR = data;
514         parport_epilogue(pp);
515 }
516 
517 static unsigned char parport_mos7715_read_control(struct parport *pp)
518 {
519         struct mos7715_parport *mos_parport = pp->private_data;
520         __u8 dcr;
521 
522         spin_lock(&release_lock);
523         mos_parport = pp->private_data;
524         if (unlikely(mos_parport == NULL)) {
525                 spin_unlock(&release_lock);
526                 return 0;
527         }
528         dcr = mos_parport->shadowDCR & 0x0f;
529         spin_unlock(&release_lock);
530         return dcr;
531 }
532 
533 static unsigned char parport_mos7715_frob_control(struct parport *pp,
534                                                   unsigned char mask,
535                                                   unsigned char val)
536 {
537         struct mos7715_parport *mos_parport = pp->private_data;
538         __u8 dcr;
539 
540         mask &= 0x0f;
541         val &= 0x0f;
542         if (parport_prologue(pp) < 0)
543                 return 0;
544         mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val;
545         write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
546                       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, MOS7720_DCR,
585                       mos_parport->shadowDCR);
586         parport_epilogue(pp);
587 }
588 
589 static void parport_mos7715_data_reverse(struct parport *pp)
590 {
591         struct mos7715_parport *mos_parport = pp->private_data;
592 
593         if (parport_prologue(pp) < 0)
594                 return;
595         mos7715_change_mode(mos_parport, PS2);
596         mos_parport->shadowDCR |= 0x20;
597         write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
598                       mos_parport->shadowDCR);
599         parport_epilogue(pp);
600 }
601 
602 static void parport_mos7715_init_state(struct pardevice *dev,
603                                        struct parport_state *s)
604 {
605         s->u.pc.ctr = DCR_INIT_VAL;
606         s->u.pc.ecr = ECR_INIT_VAL;
607 }
608 
609 /* N.B. Parport core code requires that this function not block */
610 static void parport_mos7715_save_state(struct parport *pp,
611                                        struct parport_state *s)
612 {
613         struct mos7715_parport *mos_parport;
614 
615         spin_lock(&release_lock);
616         mos_parport = pp->private_data;
617         if (unlikely(mos_parport == NULL)) {    /* release called */
618                 spin_unlock(&release_lock);
619                 return;
620         }
621         s->u.pc.ctr = mos_parport->shadowDCR;
622         s->u.pc.ecr = mos_parport->shadowECR;
623         spin_unlock(&release_lock);
624 }
625 
626 /* N.B. Parport core code requires that this function not block */
627 static void parport_mos7715_restore_state(struct parport *pp,
628                                           struct parport_state *s)
629 {
630         struct mos7715_parport *mos_parport;
631 
632         spin_lock(&release_lock);
633         mos_parport = pp->private_data;
634         if (unlikely(mos_parport == NULL)) {    /* release called */
635                 spin_unlock(&release_lock);
636                 return;
637         }
638         write_parport_reg_nonblock(mos_parport, MOS7720_DCR,
639                                    mos_parport->shadowDCR);
640         write_parport_reg_nonblock(mos_parport, MOS7720_ECR,
641                                    mos_parport->shadowECR);
642         spin_unlock(&release_lock);
643 }
644 
645 static size_t parport_mos7715_write_compat(struct parport *pp,
646                                            const void *buffer,
647                                            size_t len, int flags)
648 {
649         int retval;
650         struct mos7715_parport *mos_parport = pp->private_data;
651         int actual_len;
652 
653         if (parport_prologue(pp) < 0)
654                 return 0;
655         mos7715_change_mode(mos_parport, PPF);
656         retval = usb_bulk_msg(mos_parport->serial->dev,
657                               usb_sndbulkpipe(mos_parport->serial->dev, 2),
658                               (void *)buffer, len, &actual_len,
659                               MOS_WDR_TIMEOUT);
660         parport_epilogue(pp);
661         if (retval) {
662                 dev_err(&mos_parport->serial->dev->dev,
663                         "mos7720: usb_bulk_msg() failed: %d\n", retval);
664                 return 0;
665         }
666         return actual_len;
667 }
668 
669 static struct parport_operations parport_mos7715_ops = {
670         .owner =                THIS_MODULE,
671         .write_data =           parport_mos7715_write_data,
672         .read_data =            parport_mos7715_read_data,
673 
674         .write_control =        parport_mos7715_write_control,
675         .read_control =         parport_mos7715_read_control,
676         .frob_control =         parport_mos7715_frob_control,
677 
678         .read_status =          parport_mos7715_read_status,
679 
680         .enable_irq =           parport_mos7715_enable_irq,
681         .disable_irq =          parport_mos7715_disable_irq,
682 
683         .data_forward =         parport_mos7715_data_forward,
684         .data_reverse =         parport_mos7715_data_reverse,
685 
686         .init_state =           parport_mos7715_init_state,
687         .save_state =           parport_mos7715_save_state,
688         .restore_state =        parport_mos7715_restore_state,
689 
690         .compat_write_data =    parport_mos7715_write_compat,
691 
692         .nibble_read_data =     parport_ieee1284_read_nibble,
693         .byte_read_data =       parport_ieee1284_read_byte,
694 };
695 
696 /*
697  * Allocate and initialize parallel port control struct, initialize
698  * the parallel port hardware device, and register with the parport subsystem.
699  */
700 static int mos7715_parport_init(struct usb_serial *serial)
701 {
702         struct mos7715_parport *mos_parport;
703 
704         /* allocate and initialize parallel port control struct */
705         mos_parport = kzalloc(sizeof(struct mos7715_parport), GFP_KERNEL);
706         if (!mos_parport)
707                 return -ENOMEM;
708 
709         mos_parport->msg_pending = false;
710         kref_init(&mos_parport->ref_count);
711         spin_lock_init(&mos_parport->listlock);
712         INIT_LIST_HEAD(&mos_parport->active_urbs);
713         INIT_LIST_HEAD(&mos_parport->deferred_urbs);
714         usb_set_serial_data(serial, mos_parport); /* hijack private pointer */
715         mos_parport->serial = serial;
716         tasklet_init(&mos_parport->urb_tasklet, send_deferred_urbs,
717                      (unsigned long) mos_parport);
718         init_completion(&mos_parport->syncmsg_compl);
719 
720         /* cycle parallel port reset bit */
721         write_mos_reg(mos_parport->serial, dummy, MOS7720_PP_REG, (__u8)0x80);
722         write_mos_reg(mos_parport->serial, dummy, MOS7720_PP_REG, (__u8)0x00);
723 
724         /* initialize device registers */
725         mos_parport->shadowDCR = DCR_INIT_VAL;
726         write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
727                       mos_parport->shadowDCR);
728         mos_parport->shadowECR = ECR_INIT_VAL;
729         write_mos_reg(mos_parport->serial, dummy, MOS7720_ECR,
730                       mos_parport->shadowECR);
731 
732         /* register with parport core */
733         mos_parport->pp = parport_register_port(0, PARPORT_IRQ_NONE,
734                                                 PARPORT_DMA_NONE,
735                                                 &parport_mos7715_ops);
736         if (mos_parport->pp == NULL) {
737                 dev_err(&serial->interface->dev,
738                         "Could not register parport\n");
739                 kref_put(&mos_parport->ref_count, destroy_mos_parport);
740                 return -EIO;
741         }
742         mos_parport->pp->private_data = mos_parport;
743         mos_parport->pp->modes = PARPORT_MODE_COMPAT | PARPORT_MODE_PCSPP;
744         mos_parport->pp->dev = &serial->interface->dev;
745         parport_announce_port(mos_parport->pp);
746 
747         return 0;
748 }
749 #endif  /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
750 
751 /*
752  * mos7720_interrupt_callback
753  *      this is the callback function for when we have received data on the
754  *      interrupt endpoint.
755  */
756 static void mos7720_interrupt_callback(struct urb *urb)
757 {
758         int result;
759         int length;
760         int status = urb->status;
761         struct device *dev = &urb->dev->dev;
762         __u8 *data;
763         __u8 sp1;
764         __u8 sp2;
765 
766         switch (status) {
767         case 0:
768                 /* success */
769                 break;
770         case -ECONNRESET:
771         case -ENOENT:
772         case -ESHUTDOWN:
773                 /* this urb is terminated, clean up */
774                 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
775                 return;
776         default:
777                 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
778                 goto exit;
779         }
780 
781         length = urb->actual_length;
782         data = urb->transfer_buffer;
783 
784         /* Moschip get 4 bytes
785          * Byte 1 IIR Port 1 (port.number is 0)
786          * Byte 2 IIR Port 2 (port.number is 1)
787          * Byte 3 --------------
788          * Byte 4 FIFO status for both */
789 
790         /* the above description is inverted
791          *      oneukum 2007-03-14 */
792 
793         if (unlikely(length != 4)) {
794                 dev_dbg(dev, "Wrong data !!!\n");
795                 return;
796         }
797 
798         sp1 = data[3];
799         sp2 = data[2];
800 
801         if ((sp1 | sp2) & 0x01) {
802                 /* No Interrupt Pending in both the ports */
803                 dev_dbg(dev, "No Interrupt !!!\n");
804         } else {
805                 switch (sp1 & 0x0f) {
806                 case SERIAL_IIR_RLS:
807                         dev_dbg(dev, "Serial Port 1: Receiver status error or address bit detected in 9-bit mode\n");
808                         break;
809                 case SERIAL_IIR_CTI:
810                         dev_dbg(dev, "Serial Port 1: Receiver time out\n");
811                         break;
812                 case SERIAL_IIR_MS:
813                         /* dev_dbg(dev, "Serial Port 1: Modem status change\n"); */
814                         break;
815                 }
816 
817                 switch (sp2 & 0x0f) {
818                 case SERIAL_IIR_RLS:
819                         dev_dbg(dev, "Serial Port 2: Receiver status error or address bit detected in 9-bit mode\n");
820                         break;
821                 case SERIAL_IIR_CTI:
822                         dev_dbg(dev, "Serial Port 2: Receiver time out\n");
823                         break;
824                 case SERIAL_IIR_MS:
825                         /* dev_dbg(dev, "Serial Port 2: Modem status change\n"); */
826                         break;
827                 }
828         }
829 
830 exit:
831         result = usb_submit_urb(urb, GFP_ATOMIC);
832         if (result)
833                 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result);
834 }
835 
836 /*
837  * mos7715_interrupt_callback
838  *      this is the 7715's callback function for when we have received data on
839  *      the interrupt endpoint.
840  */
841 static void mos7715_interrupt_callback(struct urb *urb)
842 {
843         int result;
844         int length;
845         int status = urb->status;
846         struct device *dev = &urb->dev->dev;
847         __u8 *data;
848         __u8 iir;
849 
850         switch (status) {
851         case 0:
852                 /* success */
853                 break;
854         case -ECONNRESET:
855         case -ENOENT:
856         case -ESHUTDOWN:
857         case -ENODEV:
858                 /* this urb is terminated, clean up */
859                 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
860                 return;
861         default:
862                 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
863                 goto exit;
864         }
865 
866         length = urb->actual_length;
867         data = urb->transfer_buffer;
868 
869         /* Structure of data from 7715 device:
870          * Byte 1: IIR serial Port
871          * Byte 2: unused
872          * Byte 2: DSR parallel port
873          * Byte 4: FIFO status for both */
874 
875         if (unlikely(length != 4)) {
876                 dev_dbg(dev, "Wrong data !!!\n");
877                 return;
878         }
879 
880         iir = data[0];
881         if (!(iir & 0x01)) {    /* serial port interrupt pending */
882                 switch (iir & 0x0f) {
883                 case SERIAL_IIR_RLS:
884                         dev_dbg(dev, "Serial Port: Receiver status error or address bit detected in 9-bit mode\n");
885                         break;
886                 case SERIAL_IIR_CTI:
887                         dev_dbg(dev, "Serial Port: Receiver time out\n");
888                         break;
889                 case SERIAL_IIR_MS:
890                         /* dev_dbg(dev, "Serial Port: Modem status change\n"); */
891                         break;
892                 }
893         }
894 
895 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
896         {       /* update local copy of DSR reg */
897                 struct usb_serial_port *port = urb->context;
898                 struct mos7715_parport *mos_parport = port->serial->private;
899                 if (unlikely(mos_parport == NULL))
900                         return;
901                 atomic_set(&mos_parport->shadowDSR, data[2]);
902         }
903 #endif
904 
905 exit:
906         result = usb_submit_urb(urb, GFP_ATOMIC);
907         if (result)
908                 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result);
909 }
910 
911 /*
912  * mos7720_bulk_in_callback
913  *      this is the callback function for when we have received data on the
914  *      bulk in endpoint.
915  */
916 static void mos7720_bulk_in_callback(struct urb *urb)
917 {
918         int retval;
919         unsigned char *data ;
920         struct usb_serial_port *port;
921         int status = urb->status;
922 
923         if (status) {
924                 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
925                 return;
926         }
927 
928         port = urb->context;
929 
930         dev_dbg(&port->dev, "Entering...%s\n", __func__);
931 
932         data = urb->transfer_buffer;
933 
934         if (urb->actual_length) {
935                 tty_insert_flip_string(&port->port, data, urb->actual_length);
936                 tty_flip_buffer_push(&port->port);
937         }
938 
939         if (port->read_urb->status != -EINPROGRESS) {
940                 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
941                 if (retval)
942                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
943         }
944 }
945 
946 /*
947  * mos7720_bulk_out_data_callback
948  *      this is the callback function for when we have finished sending serial
949  *      data on the bulk out endpoint.
950  */
951 static void mos7720_bulk_out_data_callback(struct urb *urb)
952 {
953         struct moschip_port *mos7720_port;
954         int status = urb->status;
955 
956         if (status) {
957                 dev_dbg(&urb->dev->dev, "nonzero write bulk status received:%d\n", status);
958                 return;
959         }
960 
961         mos7720_port = urb->context;
962         if (!mos7720_port) {
963                 dev_dbg(&urb->dev->dev, "NULL mos7720_port pointer\n");
964                 return ;
965         }
966 
967         if (mos7720_port->open)
968                 tty_port_tty_wakeup(&mos7720_port->port->port);
969 }
970 
971 static int mos77xx_calc_num_ports(struct usb_serial *serial)
972 {
973         u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
974         if (product == MOSCHIP_DEVICE_ID_7715)
975                 return 1;
976 
977         return 2;
978 }
979 
980 static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port)
981 {
982         struct usb_serial *serial;
983         struct urb *urb;
984         struct moschip_port *mos7720_port;
985         int response;
986         int port_number;
987         __u8 data;
988         int allocated_urbs = 0;
989         int j;
990 
991         serial = port->serial;
992 
993         mos7720_port = usb_get_serial_port_data(port);
994         if (mos7720_port == NULL)
995                 return -ENODEV;
996 
997         usb_clear_halt(serial->dev, port->write_urb->pipe);
998         usb_clear_halt(serial->dev, port->read_urb->pipe);
999 
1000         /* Initialising the write urb pool */
1001         for (j = 0; j < NUM_URBS; ++j) {
1002                 urb = usb_alloc_urb(0, GFP_KERNEL);
1003                 mos7720_port->write_urb_pool[j] = urb;
1004                 if (!urb)
1005                         continue;
1006 
1007                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1008                                                GFP_KERNEL);
1009                 if (!urb->transfer_buffer) {
1010                         usb_free_urb(mos7720_port->write_urb_pool[j]);
1011                         mos7720_port->write_urb_pool[j] = NULL;
1012                         continue;
1013                 }
1014                 allocated_urbs++;
1015         }
1016 
1017         if (!allocated_urbs)
1018                 return -ENOMEM;
1019 
1020          /* Initialize MCS7720 -- Write Init values to corresponding Registers
1021           *
1022           * Register Index
1023           * 0 : MOS7720_THR/MOS7720_RHR
1024           * 1 : MOS7720_IER
1025           * 2 : MOS7720_FCR
1026           * 3 : MOS7720_LCR
1027           * 4 : MOS7720_MCR
1028           * 5 : MOS7720_LSR
1029           * 6 : MOS7720_MSR
1030           * 7 : MOS7720_SPR
1031           *
1032           * 0x08 : SP1/2 Control Reg
1033           */
1034         port_number = port->port_number;
1035         read_mos_reg(serial, port_number, MOS7720_LSR, &data);
1036 
1037         dev_dbg(&port->dev, "SS::%p LSR:%x\n", mos7720_port, data);
1038 
1039         write_mos_reg(serial, dummy, MOS7720_SP1_REG, 0x02);
1040         write_mos_reg(serial, dummy, MOS7720_SP2_REG, 0x02);
1041 
1042         write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
1043         write_mos_reg(serial, port_number, MOS7720_FCR, 0x00);
1044 
1045         write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf);
1046         mos7720_port->shadowLCR = 0x03;
1047         write_mos_reg(serial, port_number, MOS7720_LCR,
1048                       mos7720_port->shadowLCR);
1049         mos7720_port->shadowMCR = 0x0b;
1050         write_mos_reg(serial, port_number, MOS7720_MCR,
1051                       mos7720_port->shadowMCR);
1052 
1053         write_mos_reg(serial, port_number, MOS7720_SP_CONTROL_REG, 0x00);
1054         read_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, &data);
1055         data = data | (port->port_number + 1);
1056         write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, data);
1057         mos7720_port->shadowLCR = 0x83;
1058         write_mos_reg(serial, port_number, MOS7720_LCR,
1059                       mos7720_port->shadowLCR);
1060         write_mos_reg(serial, port_number, MOS7720_THR, 0x0c);
1061         write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
1062         mos7720_port->shadowLCR = 0x03;
1063         write_mos_reg(serial, port_number, MOS7720_LCR,
1064                       mos7720_port->shadowLCR);
1065         write_mos_reg(serial, port_number, MOS7720_IER, 0x0c);
1066 
1067         response = usb_submit_urb(port->read_urb, GFP_KERNEL);
1068         if (response)
1069                 dev_err(&port->dev, "%s - Error %d submitting read urb\n",
1070                                                         __func__, response);
1071 
1072         /* initialize our port settings */
1073         mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */
1074 
1075         /* send a open port command */
1076         mos7720_port->open = 1;
1077 
1078         return 0;
1079 }
1080 
1081 /*
1082  * mos7720_chars_in_buffer
1083  *      this function is called by the tty driver when it wants to know how many
1084  *      bytes of data we currently have outstanding in the port (data that has
1085  *      been written, but hasn't made it out the port yet)
1086  *      If successful, we return the number of bytes left to be written in the
1087  *      system,
1088  *      Otherwise we return a negative error number.
1089  */
1090 static int mos7720_chars_in_buffer(struct tty_struct *tty)
1091 {
1092         struct usb_serial_port *port = tty->driver_data;
1093         int i;
1094         int chars = 0;
1095         struct moschip_port *mos7720_port;
1096 
1097         mos7720_port = usb_get_serial_port_data(port);
1098         if (mos7720_port == NULL)
1099                 return 0;
1100 
1101         for (i = 0; i < NUM_URBS; ++i) {
1102                 if (mos7720_port->write_urb_pool[i] &&
1103                     mos7720_port->write_urb_pool[i]->status == -EINPROGRESS)
1104                         chars += URB_TRANSFER_BUFFER_SIZE;
1105         }
1106         dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1107         return chars;
1108 }
1109 
1110 static void mos7720_close(struct usb_serial_port *port)
1111 {
1112         struct usb_serial *serial;
1113         struct moschip_port *mos7720_port;
1114         int j;
1115 
1116         serial = port->serial;
1117 
1118         mos7720_port = usb_get_serial_port_data(port);
1119         if (mos7720_port == NULL)
1120                 return;
1121 
1122         for (j = 0; j < NUM_URBS; ++j)
1123                 usb_kill_urb(mos7720_port->write_urb_pool[j]);
1124 
1125         /* Freeing Write URBs */
1126         for (j = 0; j < NUM_URBS; ++j) {
1127                 if (mos7720_port->write_urb_pool[j]) {
1128                         kfree(mos7720_port->write_urb_pool[j]->transfer_buffer);
1129                         usb_free_urb(mos7720_port->write_urb_pool[j]);
1130                 }
1131         }
1132 
1133         /* While closing port, shutdown all bulk read, write  *
1134          * and interrupt read if they exists, otherwise nop   */
1135         usb_kill_urb(port->write_urb);
1136         usb_kill_urb(port->read_urb);
1137 
1138         write_mos_reg(serial, port->port_number, MOS7720_MCR, 0x00);
1139         write_mos_reg(serial, port->port_number, MOS7720_IER, 0x00);
1140 
1141         mos7720_port->open = 0;
1142 }
1143 
1144 static void mos7720_break(struct tty_struct *tty, int break_state)
1145 {
1146         struct usb_serial_port *port = tty->driver_data;
1147         unsigned char data;
1148         struct usb_serial *serial;
1149         struct moschip_port *mos7720_port;
1150 
1151         serial = port->serial;
1152 
1153         mos7720_port = usb_get_serial_port_data(port);
1154         if (mos7720_port == NULL)
1155                 return;
1156 
1157         if (break_state == -1)
1158                 data = mos7720_port->shadowLCR | UART_LCR_SBC;
1159         else
1160                 data = mos7720_port->shadowLCR & ~UART_LCR_SBC;
1161 
1162         mos7720_port->shadowLCR  = data;
1163         write_mos_reg(serial, port->port_number, MOS7720_LCR,
1164                       mos7720_port->shadowLCR);
1165 }
1166 
1167 /*
1168  * mos7720_write_room
1169  *      this function is called by the tty driver when it wants to know how many
1170  *      bytes of data we can accept for a specific port.
1171  *      If successful, we return the amount of room that we have for this port
1172  *      Otherwise we return a negative error number.
1173  */
1174 static int mos7720_write_room(struct tty_struct *tty)
1175 {
1176         struct usb_serial_port *port = tty->driver_data;
1177         struct moschip_port *mos7720_port;
1178         int room = 0;
1179         int i;
1180 
1181         mos7720_port = usb_get_serial_port_data(port);
1182         if (mos7720_port == NULL)
1183                 return -ENODEV;
1184 
1185         /* FIXME: Locking */
1186         for (i = 0; i < NUM_URBS; ++i) {
1187                 if (mos7720_port->write_urb_pool[i] &&
1188                     mos7720_port->write_urb_pool[i]->status != -EINPROGRESS)
1189                         room += URB_TRANSFER_BUFFER_SIZE;
1190         }
1191 
1192         dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
1193         return room;
1194 }
1195 
1196 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port,
1197                                  const unsigned char *data, int count)
1198 {
1199         int status;
1200         int i;
1201         int bytes_sent = 0;
1202         int transfer_size;
1203 
1204         struct moschip_port *mos7720_port;
1205         struct usb_serial *serial;
1206         struct urb    *urb;
1207         const unsigned char *current_position = data;
1208 
1209         serial = port->serial;
1210 
1211         mos7720_port = usb_get_serial_port_data(port);
1212         if (mos7720_port == NULL)
1213                 return -ENODEV;
1214 
1215         /* try to find a free urb in the list */
1216         urb = NULL;
1217 
1218         for (i = 0; i < NUM_URBS; ++i) {
1219                 if (mos7720_port->write_urb_pool[i] &&
1220                     mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) {
1221                         urb = mos7720_port->write_urb_pool[i];
1222                         dev_dbg(&port->dev, "URB:%d\n", i);
1223                         break;
1224                 }
1225         }
1226 
1227         if (urb == NULL) {
1228                 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1229                 goto exit;
1230         }
1231 
1232         if (urb->transfer_buffer == NULL) {
1233                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1234                                                GFP_ATOMIC);
1235                 if (!urb->transfer_buffer)
1236                         goto exit;
1237         }
1238         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1239 
1240         memcpy(urb->transfer_buffer, current_position, transfer_size);
1241         usb_serial_debug_data(&port->dev, __func__, transfer_size,
1242                               urb->transfer_buffer);
1243 
1244         /* fill urb with data and submit  */
1245         usb_fill_bulk_urb(urb, serial->dev,
1246                           usb_sndbulkpipe(serial->dev,
1247                                         port->bulk_out_endpointAddress),
1248                           urb->transfer_buffer, transfer_size,
1249                           mos7720_bulk_out_data_callback, mos7720_port);
1250 
1251         /* send it down the pipe */
1252         status = usb_submit_urb(urb, GFP_ATOMIC);
1253         if (status) {
1254                 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1255                         "with status = %d\n", __func__, status);
1256                 bytes_sent = status;
1257                 goto exit;
1258         }
1259         bytes_sent = transfer_size;
1260 
1261 exit:
1262         return bytes_sent;
1263 }
1264 
1265 static void mos7720_throttle(struct tty_struct *tty)
1266 {
1267         struct usb_serial_port *port = tty->driver_data;
1268         struct moschip_port *mos7720_port;
1269         int status;
1270 
1271         mos7720_port = usb_get_serial_port_data(port);
1272 
1273         if (mos7720_port == NULL)
1274                 return;
1275 
1276         if (!mos7720_port->open) {
1277                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1278                 return;
1279         }
1280 
1281         /* if we are implementing XON/XOFF, send the stop character */
1282         if (I_IXOFF(tty)) {
1283                 unsigned char stop_char = STOP_CHAR(tty);
1284                 status = mos7720_write(tty, port, &stop_char, 1);
1285                 if (status <= 0)
1286                         return;
1287         }
1288 
1289         /* if we are implementing RTS/CTS, toggle that line */
1290         if (C_CRTSCTS(tty)) {
1291                 mos7720_port->shadowMCR &= ~UART_MCR_RTS;
1292                 write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
1293                               mos7720_port->shadowMCR);
1294         }
1295 }
1296 
1297 static void mos7720_unthrottle(struct tty_struct *tty)
1298 {
1299         struct usb_serial_port *port = tty->driver_data;
1300         struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1301         int status;
1302 
1303         if (mos7720_port == NULL)
1304                 return;
1305 
1306         if (!mos7720_port->open) {
1307                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1308                 return;
1309         }
1310 
1311         /* if we are implementing XON/XOFF, send the start character */
1312         if (I_IXOFF(tty)) {
1313                 unsigned char start_char = START_CHAR(tty);
1314                 status = mos7720_write(tty, port, &start_char, 1);
1315                 if (status <= 0)
1316                         return;
1317         }
1318 
1319         /* if we are implementing RTS/CTS, toggle that line */
1320         if (C_CRTSCTS(tty)) {
1321                 mos7720_port->shadowMCR |= UART_MCR_RTS;
1322                 write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
1323                               mos7720_port->shadowMCR);
1324         }
1325 }
1326 
1327 /* FIXME: this function does not work */
1328 static int set_higher_rates(struct moschip_port *mos7720_port,
1329                             unsigned int baud)
1330 {
1331         struct usb_serial_port *port;
1332         struct usb_serial *serial;
1333         int port_number;
1334         enum mos_regs sp_reg;
1335         if (mos7720_port == NULL)
1336                 return -EINVAL;
1337 
1338         port = mos7720_port->port;
1339         serial = port->serial;
1340 
1341          /***********************************************
1342          *      Init Sequence for higher rates
1343          ***********************************************/
1344         dev_dbg(&port->dev, "Sending Setting Commands ..........\n");
1345         port_number = port->port_number;
1346 
1347         write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
1348         write_mos_reg(serial, port_number, MOS7720_FCR, 0x00);
1349         write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf);
1350         mos7720_port->shadowMCR = 0x0b;
1351         write_mos_reg(serial, port_number, MOS7720_MCR,
1352                       mos7720_port->shadowMCR);
1353         write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 0x00);
1354 
1355         /***********************************************
1356          *              Set for higher rates           *
1357          ***********************************************/
1358         /* writing baud rate verbatum into uart clock field clearly not right */
1359         if (port_number == 0)
1360                 sp_reg = MOS7720_SP1_REG;
1361         else
1362                 sp_reg = MOS7720_SP2_REG;
1363         write_mos_reg(serial, dummy, sp_reg, baud * 0x10);
1364         write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 0x03);
1365         mos7720_port->shadowMCR = 0x2b;
1366         write_mos_reg(serial, port_number, MOS7720_MCR,
1367                       mos7720_port->shadowMCR);
1368 
1369         /***********************************************
1370          *              Set DLL/DLM
1371          ***********************************************/
1372         mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1373         write_mos_reg(serial, port_number, MOS7720_LCR,
1374                       mos7720_port->shadowLCR);
1375         write_mos_reg(serial, port_number, MOS7720_DLL, 0x01);
1376         write_mos_reg(serial, port_number, MOS7720_DLM, 0x00);
1377         mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1378         write_mos_reg(serial, port_number, MOS7720_LCR,
1379                       mos7720_port->shadowLCR);
1380 
1381         return 0;
1382 }
1383 
1384 /* baud rate information */
1385 struct divisor_table_entry {
1386         __u32  baudrate;
1387         __u16  divisor;
1388 };
1389 
1390 /* Define table of divisors for moschip 7720 hardware      *
1391  * These assume a 3.6864MHz crystal, the standard /16, and *
1392  * MCR.7 = 0.                                              */
1393 static struct divisor_table_entry divisor_table[] = {
1394         {   50,         2304},
1395         {   110,        1047},  /* 2094.545455 => 230450   => .0217 % over */
1396         {   134,        857},   /* 1713.011152 => 230398.5 => .00065% under */
1397         {   150,        768},
1398         {   300,        384},
1399         {   600,        192},
1400         {   1200,       96},
1401         {   1800,       64},
1402         {   2400,       48},
1403         {   4800,       24},
1404         {   7200,       16},
1405         {   9600,       12},
1406         {   19200,      6},
1407         {   38400,      3},
1408         {   57600,      2},
1409         {   115200,     1},
1410 };
1411 
1412 /*****************************************************************************
1413  * calc_baud_rate_divisor
1414  *      this function calculates the proper baud rate divisor for the specified
1415  *      baud rate.
1416  *****************************************************************************/
1417 static int calc_baud_rate_divisor(struct usb_serial_port *port, int baudrate, int *divisor)
1418 {
1419         int i;
1420         __u16 custom;
1421         __u16 round1;
1422         __u16 round;
1423 
1424 
1425         dev_dbg(&port->dev, "%s - %d\n", __func__, baudrate);
1426 
1427         for (i = 0; i < ARRAY_SIZE(divisor_table); i++) {
1428                 if (divisor_table[i].baudrate == baudrate) {
1429                         *divisor = divisor_table[i].divisor;
1430                         return 0;
1431                 }
1432         }
1433 
1434         /* After trying for all the standard baud rates    *
1435          * Try calculating the divisor for this baud rate  */
1436         if (baudrate > 75 &&  baudrate < 230400) {
1437                 /* get the divisor */
1438                 custom = (__u16)(230400L  / baudrate);
1439 
1440                 /* Check for round off */
1441                 round1 = (__u16)(2304000L / baudrate);
1442                 round = (__u16)(round1 - (custom * 10));
1443                 if (round > 4)
1444                         custom++;
1445                 *divisor = custom;
1446 
1447                 dev_dbg(&port->dev, "Baud %d = %d\n", baudrate, custom);
1448                 return 0;
1449         }
1450 
1451         dev_dbg(&port->dev, "Baud calculation Failed...\n");
1452         return -EINVAL;
1453 }
1454 
1455 /*
1456  * send_cmd_write_baud_rate
1457  *      this function sends the proper command to change the baud rate of the
1458  *      specified port.
1459  */
1460 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port,
1461                                     int baudrate)
1462 {
1463         struct usb_serial_port *port;
1464         struct usb_serial *serial;
1465         int divisor;
1466         int status;
1467         unsigned char number;
1468 
1469         if (mos7720_port == NULL)
1470                 return -1;
1471 
1472         port = mos7720_port->port;
1473         serial = port->serial;
1474 
1475         number = port->port_number;
1476         dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudrate);
1477 
1478         /* Calculate the Divisor */
1479         status = calc_baud_rate_divisor(port, baudrate, &divisor);
1480         if (status) {
1481                 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1482                 return status;
1483         }
1484 
1485         /* Enable access to divisor latch */
1486         mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1487         write_mos_reg(serial, number, MOS7720_LCR, mos7720_port->shadowLCR);
1488 
1489         /* Write the divisor */
1490         write_mos_reg(serial, number, MOS7720_DLL, (__u8)(divisor & 0xff));
1491         write_mos_reg(serial, number, MOS7720_DLM,
1492                       (__u8)((divisor & 0xff00) >> 8));
1493 
1494         /* Disable access to divisor latch */
1495         mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1496         write_mos_reg(serial, number, MOS7720_LCR, mos7720_port->shadowLCR);
1497 
1498         return status;
1499 }
1500 
1501 /*
1502  * change_port_settings
1503  *      This routine is called to set the UART on the device to match
1504  *      the specified new settings.
1505  */
1506 static void change_port_settings(struct tty_struct *tty,
1507                                  struct moschip_port *mos7720_port,
1508                                  struct ktermios *old_termios)
1509 {
1510         struct usb_serial_port *port;
1511         struct usb_serial *serial;
1512         int baud;
1513         unsigned cflag;
1514         unsigned iflag;
1515         __u8 mask = 0xff;
1516         __u8 lData;
1517         __u8 lParity;
1518         __u8 lStop;
1519         int status;
1520         int port_number;
1521 
1522         if (mos7720_port == NULL)
1523                 return ;
1524 
1525         port = mos7720_port->port;
1526         serial = port->serial;
1527         port_number = port->port_number;
1528 
1529         if (!mos7720_port->open) {
1530                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1531                 return;
1532         }
1533 
1534         lData = UART_LCR_WLEN8;
1535         lStop = 0x00;   /* 1 stop bit */
1536         lParity = 0x00; /* No parity */
1537 
1538         cflag = tty->termios.c_cflag;
1539         iflag = tty->termios.c_iflag;
1540 
1541         /* Change the number of bits */
1542         switch (cflag & CSIZE) {
1543         case CS5:
1544                 lData = UART_LCR_WLEN5;
1545                 mask = 0x1f;
1546                 break;
1547 
1548         case CS6:
1549                 lData = UART_LCR_WLEN6;
1550                 mask = 0x3f;
1551                 break;
1552 
1553         case CS7:
1554                 lData = UART_LCR_WLEN7;
1555                 mask = 0x7f;
1556                 break;
1557         default:
1558         case CS8:
1559                 lData = UART_LCR_WLEN8;
1560                 break;
1561         }
1562 
1563         /* Change the Parity bit */
1564         if (cflag & PARENB) {
1565                 if (cflag & PARODD) {
1566                         lParity = UART_LCR_PARITY;
1567                         dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1568                 } else {
1569                         lParity = (UART_LCR_EPAR | UART_LCR_PARITY);
1570                         dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1571                 }
1572 
1573         } else {
1574                 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1575         }
1576 
1577         if (cflag & CMSPAR)
1578                 lParity = lParity | 0x20;
1579 
1580         /* Change the Stop bit */
1581         if (cflag & CSTOPB) {
1582                 lStop = UART_LCR_STOP;
1583                 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1584         } else {
1585                 lStop = 0x00;
1586                 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1587         }
1588 
1589 #define LCR_BITS_MASK           0x03    /* Mask for bits/char field */
1590 #define LCR_STOP_MASK           0x04    /* Mask for stop bits field */
1591 #define LCR_PAR_MASK            0x38    /* Mask for parity field */
1592 
1593         /* Update the LCR with the correct value */
1594         mos7720_port->shadowLCR &=
1595                 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1596         mos7720_port->shadowLCR |= (lData | lParity | lStop);
1597 
1598 
1599         /* Disable Interrupts */
1600         write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
1601         write_mos_reg(serial, port_number, MOS7720_FCR, 0x00);
1602         write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf);
1603 
1604         /* Send the updated LCR value to the mos7720 */
1605         write_mos_reg(serial, port_number, MOS7720_LCR,
1606                       mos7720_port->shadowLCR);
1607         mos7720_port->shadowMCR = 0x0b;
1608         write_mos_reg(serial, port_number, MOS7720_MCR,
1609                       mos7720_port->shadowMCR);
1610 
1611         /* set up the MCR register and send it to the mos7720 */
1612         mos7720_port->shadowMCR = UART_MCR_OUT2;
1613         if (cflag & CBAUD)
1614                 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS);
1615 
1616         if (cflag & CRTSCTS) {
1617                 mos7720_port->shadowMCR |= (UART_MCR_XONANY);
1618                 /* To set hardware flow control to the specified *
1619                  * serial port, in SP1/2_CONTROL_REG             */
1620                 if (port_number)
1621                         write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG,
1622                                       0x01);
1623                 else
1624                         write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG,
1625                                       0x02);
1626 
1627         } else
1628                 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY);
1629 
1630         write_mos_reg(serial, port_number, MOS7720_MCR,
1631                       mos7720_port->shadowMCR);
1632 
1633         /* Determine divisor based on baud rate */
1634         baud = tty_get_baud_rate(tty);
1635         if (!baud) {
1636                 /* pick a default, any default... */
1637                 dev_dbg(&port->dev, "Picked default baud...\n");
1638                 baud = 9600;
1639         }
1640 
1641         if (baud >= 230400) {
1642                 set_higher_rates(mos7720_port, baud);
1643                 /* Enable Interrupts */
1644                 write_mos_reg(serial, port_number, MOS7720_IER, 0x0c);
1645                 return;
1646         }
1647 
1648         dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1649         status = send_cmd_write_baud_rate(mos7720_port, baud);
1650         /* FIXME: needs to write actual resulting baud back not just
1651            blindly do so */
1652         if (cflag & CBAUD)
1653                 tty_encode_baud_rate(tty, baud, baud);
1654         /* Enable Interrupts */
1655         write_mos_reg(serial, port_number, MOS7720_IER, 0x0c);
1656 
1657         if (port->read_urb->status != -EINPROGRESS) {
1658                 status = usb_submit_urb(port->read_urb, GFP_KERNEL);
1659                 if (status)
1660                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status);
1661         }
1662 }
1663 
1664 /*
1665  * mos7720_set_termios
1666  *      this function is called by the tty driver when it wants to change the
1667  *      termios structure.
1668  */
1669 static void mos7720_set_termios(struct tty_struct *tty,
1670                 struct usb_serial_port *port, struct ktermios *old_termios)
1671 {
1672         int status;
1673         unsigned int cflag;
1674         struct usb_serial *serial;
1675         struct moschip_port *mos7720_port;
1676 
1677         serial = port->serial;
1678 
1679         mos7720_port = usb_get_serial_port_data(port);
1680 
1681         if (mos7720_port == NULL)
1682                 return;
1683 
1684         if (!mos7720_port->open) {
1685                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1686                 return;
1687         }
1688 
1689         dev_dbg(&port->dev, "setting termios - ASPIRE\n");
1690 
1691         cflag = tty->termios.c_cflag;
1692 
1693         dev_dbg(&port->dev, "%s - cflag %08x iflag %08x\n", __func__,
1694                 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
1695 
1696         dev_dbg(&port->dev, "%s - old cflag %08x old iflag %08x\n", __func__,
1697                 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
1698 
1699         /* change the port settings to the new ones specified */
1700         change_port_settings(tty, mos7720_port, old_termios);
1701 
1702         if (port->read_urb->status != -EINPROGRESS) {
1703                 status = usb_submit_urb(port->read_urb, GFP_KERNEL);
1704                 if (status)
1705                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status);
1706         }
1707 }
1708 
1709 /*
1710  * get_lsr_info - get line status register info
1711  *
1712  * Purpose: Let user call ioctl() to get info when the UART physically
1713  *          is emptied.  On bus types like RS485, the transmitter must
1714  *          release the bus after transmitting. This must be done when
1715  *          the transmit shift register is empty, not be done when the
1716  *          transmit holding register is empty.  This functionality
1717  *          allows an RS485 driver to be written in user space.
1718  */
1719 static int get_lsr_info(struct tty_struct *tty,
1720                 struct moschip_port *mos7720_port, unsigned int __user *value)
1721 {
1722         struct usb_serial_port *port = tty->driver_data;
1723         unsigned int result = 0;
1724         unsigned char data = 0;
1725         int port_number = port->port_number;
1726         int count;
1727 
1728         count = mos7720_chars_in_buffer(tty);
1729         if (count == 0) {
1730                 read_mos_reg(port->serial, port_number, MOS7720_LSR, &data);
1731                 if ((data & (UART_LSR_TEMT | UART_LSR_THRE))
1732                                         == (UART_LSR_TEMT | UART_LSR_THRE)) {
1733                         dev_dbg(&port->dev, "%s -- Empty\n", __func__);
1734                         result = TIOCSER_TEMT;
1735                 }
1736         }
1737         if (copy_to_user(value, &result, sizeof(int)))
1738                 return -EFAULT;
1739         return 0;
1740 }
1741 
1742 static int mos7720_tiocmget(struct tty_struct *tty)
1743 {
1744         struct usb_serial_port *port = tty->driver_data;
1745         struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1746         unsigned int result = 0;
1747         unsigned int mcr ;
1748         unsigned int msr ;
1749 
1750         mcr = mos7720_port->shadowMCR;
1751         msr = mos7720_port->shadowMSR;
1752 
1753         result = ((mcr & UART_MCR_DTR)  ? TIOCM_DTR : 0)   /* 0x002 */
1754           | ((mcr & UART_MCR_RTS)   ? TIOCM_RTS : 0)   /* 0x004 */
1755           | ((msr & UART_MSR_CTS)   ? TIOCM_CTS : 0)   /* 0x020 */
1756           | ((msr & UART_MSR_DCD)   ? TIOCM_CAR : 0)   /* 0x040 */
1757           | ((msr & UART_MSR_RI)    ? TIOCM_RI :  0)   /* 0x080 */
1758           | ((msr & UART_MSR_DSR)   ? TIOCM_DSR : 0);  /* 0x100 */
1759 
1760         return result;
1761 }
1762 
1763 static int mos7720_tiocmset(struct tty_struct *tty,
1764                             unsigned int set, unsigned int clear)
1765 {
1766         struct usb_serial_port *port = tty->driver_data;
1767         struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1768         unsigned int mcr ;
1769 
1770         mcr = mos7720_port->shadowMCR;
1771 
1772         if (set & TIOCM_RTS)
1773                 mcr |= UART_MCR_RTS;
1774         if (set & TIOCM_DTR)
1775                 mcr |= UART_MCR_DTR;
1776         if (set & TIOCM_LOOP)
1777                 mcr |= UART_MCR_LOOP;
1778 
1779         if (clear & TIOCM_RTS)
1780                 mcr &= ~UART_MCR_RTS;
1781         if (clear & TIOCM_DTR)
1782                 mcr &= ~UART_MCR_DTR;
1783         if (clear & TIOCM_LOOP)
1784                 mcr &= ~UART_MCR_LOOP;
1785 
1786         mos7720_port->shadowMCR = mcr;
1787         write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
1788                       mos7720_port->shadowMCR);
1789 
1790         return 0;
1791 }
1792 
1793 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd,
1794                           unsigned int __user *value)
1795 {
1796         unsigned int mcr;
1797         unsigned int arg;
1798 
1799         struct usb_serial_port *port;
1800 
1801         if (mos7720_port == NULL)
1802                 return -1;
1803 
1804         port = (struct usb_serial_port *)mos7720_port->port;
1805         mcr = mos7720_port->shadowMCR;
1806 
1807         if (copy_from_user(&arg, value, sizeof(int)))
1808                 return -EFAULT;
1809 
1810         switch (cmd) {
1811         case TIOCMBIS:
1812                 if (arg & TIOCM_RTS)
1813                         mcr |= UART_MCR_RTS;
1814                 if (arg & TIOCM_DTR)
1815                         mcr |= UART_MCR_RTS;
1816                 if (arg & TIOCM_LOOP)
1817                         mcr |= UART_MCR_LOOP;
1818                 break;
1819 
1820         case TIOCMBIC:
1821                 if (arg & TIOCM_RTS)
1822                         mcr &= ~UART_MCR_RTS;
1823                 if (arg & TIOCM_DTR)
1824                         mcr &= ~UART_MCR_RTS;
1825                 if (arg & TIOCM_LOOP)
1826                         mcr &= ~UART_MCR_LOOP;
1827                 break;
1828 
1829         }
1830 
1831         mos7720_port->shadowMCR = mcr;
1832         write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
1833                       mos7720_port->shadowMCR);
1834 
1835         return 0;
1836 }
1837 
1838 static int get_serial_info(struct moschip_port *mos7720_port,
1839                            struct serial_struct __user *retinfo)
1840 {
1841         struct serial_struct tmp;
1842 
1843         memset(&tmp, 0, sizeof(tmp));
1844 
1845         tmp.type                = PORT_16550A;
1846         tmp.line                = mos7720_port->port->minor;
1847         tmp.port                = mos7720_port->port->port_number;
1848         tmp.irq                 = 0;
1849         tmp.flags               = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
1850         tmp.xmit_fifo_size      = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1851         tmp.baud_base           = 9600;
1852         tmp.close_delay         = 5*HZ;
1853         tmp.closing_wait        = 30*HZ;
1854 
1855         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1856                 return -EFAULT;
1857         return 0;
1858 }
1859 
1860 static int mos7720_ioctl(struct tty_struct *tty,
1861                          unsigned int cmd, unsigned long arg)
1862 {
1863         struct usb_serial_port *port = tty->driver_data;
1864         struct moschip_port *mos7720_port;
1865 
1866         mos7720_port = usb_get_serial_port_data(port);
1867         if (mos7720_port == NULL)
1868                 return -ENODEV;
1869 
1870         switch (cmd) {
1871         case TIOCSERGETLSR:
1872                 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
1873                 return get_lsr_info(tty, mos7720_port,
1874                                         (unsigned int __user *)arg);
1875 
1876         /* FIXME: These should be using the mode methods */
1877         case TIOCMBIS:
1878         case TIOCMBIC:
1879                 dev_dbg(&port->dev, "%s TIOCMSET/TIOCMBIC/TIOCMSET\n", __func__);
1880                 return set_modem_info(mos7720_port, cmd,
1881                                       (unsigned int __user *)arg);
1882 
1883         case TIOCGSERIAL:
1884                 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
1885                 return get_serial_info(mos7720_port,
1886                                        (struct serial_struct __user *)arg);
1887         }
1888 
1889         return -ENOIOCTLCMD;
1890 }
1891 
1892 static int mos7720_startup(struct usb_serial *serial)
1893 {
1894         struct usb_device *dev;
1895         char data;
1896         u16 product;
1897         int ret_val;
1898 
1899         if (serial->num_bulk_in < 2 || serial->num_bulk_out < 2) {
1900                 dev_err(&serial->interface->dev, "missing bulk endpoints\n");
1901                 return -ENODEV;
1902         }
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                 if (serial->port[0]->interrupt_in_urb) {
1930                         struct urb *urb = serial->port[0]->interrupt_in_urb;
1931 
1932                         urb->complete = mos7715_interrupt_callback;
1933                 }
1934         }
1935 
1936         /* setting configuration feature to one */
1937         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1938                         (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5000);
1939 
1940 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
1941         if (product == MOSCHIP_DEVICE_ID_7715) {
1942                 ret_val = mos7715_parport_init(serial);
1943                 if (ret_val < 0)
1944                         return ret_val;
1945         }
1946 #endif
1947         /* start the interrupt urb */
1948         ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL);
1949         if (ret_val) {
1950                 dev_err(&dev->dev, "failed to submit interrupt urb: %d\n",
1951                         ret_val);
1952         }
1953 
1954         /* LSR For Port 1 */
1955         read_mos_reg(serial, 0, MOS7720_LSR, &data);
1956         dev_dbg(&dev->dev, "LSR:%x\n", data);
1957 
1958         return 0;
1959 }
1960 
1961 static void mos7720_release(struct usb_serial *serial)
1962 {
1963         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1964 
1965 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
1966         /* close the parallel port */
1967 
1968         if (le16_to_cpu(serial->dev->descriptor.idProduct)
1969             == MOSCHIP_DEVICE_ID_7715) {
1970                 struct urbtracker *urbtrack;
1971                 unsigned long flags;
1972                 struct mos7715_parport *mos_parport =
1973                         usb_get_serial_data(serial);
1974 
1975                 /* prevent NULL ptr dereference in port callbacks */
1976                 spin_lock(&release_lock);
1977                 mos_parport->pp->private_data = NULL;
1978                 spin_unlock(&release_lock);
1979 
1980                 /* wait for synchronous usb calls to return */
1981                 if (mos_parport->msg_pending)
1982                         wait_for_completion_timeout(&mos_parport->syncmsg_compl,
1983                                             msecs_to_jiffies(MOS_WDR_TIMEOUT));
1984 
1985                 parport_remove_port(mos_parport->pp);
1986                 usb_set_serial_data(serial, NULL);
1987                 mos_parport->serial = NULL;
1988 
1989                 /* if tasklet currently scheduled, wait for it to complete */
1990                 tasklet_kill(&mos_parport->urb_tasklet);
1991 
1992                 /* unlink any urbs sent by the tasklet  */
1993                 spin_lock_irqsave(&mos_parport->listlock, flags);
1994                 list_for_each_entry(urbtrack,
1995                                     &mos_parport->active_urbs,
1996                                     urblist_entry)
1997                         usb_unlink_urb(urbtrack->urb);
1998                 spin_unlock_irqrestore(&mos_parport->listlock, flags);
1999                 parport_del_port(mos_parport->pp);
2000 
2001                 kref_put(&mos_parport->ref_count, destroy_mos_parport);
2002         }
2003 #endif
2004 }
2005 
2006 static int mos7720_port_probe(struct usb_serial_port *port)
2007 {
2008         struct moschip_port *mos7720_port;
2009 
2010         mos7720_port = kzalloc(sizeof(*mos7720_port), GFP_KERNEL);
2011         if (!mos7720_port)
2012                 return -ENOMEM;
2013 
2014         mos7720_port->port = port;
2015 
2016         usb_set_serial_port_data(port, mos7720_port);
2017 
2018         return 0;
2019 }
2020 
2021 static int mos7720_port_remove(struct usb_serial_port *port)
2022 {
2023         struct moschip_port *mos7720_port;
2024 
2025         mos7720_port = usb_get_serial_port_data(port);
2026         kfree(mos7720_port);
2027 
2028         return 0;
2029 }
2030 
2031 static struct usb_serial_driver moschip7720_2port_driver = {
2032         .driver = {
2033                 .owner =        THIS_MODULE,
2034                 .name =         "moschip7720",
2035         },
2036         .description            = "Moschip 2 port adapter",
2037         .id_table               = id_table,
2038         .calc_num_ports         = mos77xx_calc_num_ports,
2039         .open                   = mos7720_open,
2040         .close                  = mos7720_close,
2041         .throttle               = mos7720_throttle,
2042         .unthrottle             = mos7720_unthrottle,
2043         .attach                 = mos7720_startup,
2044         .release                = mos7720_release,
2045         .port_probe             = mos7720_port_probe,
2046         .port_remove            = mos7720_port_remove,
2047         .ioctl                  = mos7720_ioctl,
2048         .tiocmget               = mos7720_tiocmget,
2049         .tiocmset               = mos7720_tiocmset,
2050         .set_termios            = mos7720_set_termios,
2051         .write                  = mos7720_write,
2052         .write_room             = mos7720_write_room,
2053         .chars_in_buffer        = mos7720_chars_in_buffer,
2054         .break_ctl              = mos7720_break,
2055         .read_bulk_callback     = mos7720_bulk_in_callback,
2056         .read_int_callback      = mos7720_interrupt_callback,
2057 };
2058 
2059 static struct usb_serial_driver * const serial_drivers[] = {
2060         &moschip7720_2port_driver, NULL
2061 };
2062 
2063 module_usb_serial_driver(serial_drivers, id_table);
2064 
2065 MODULE_AUTHOR(DRIVER_AUTHOR);
2066 MODULE_DESCRIPTION(DRIVER_DESC);
2067 MODULE_LICENSE("GPL");
2068 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us