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Merge git://www.linux-watchdog.org/linux-watchdog
[linux/fpc-iii.git] / drivers / usb / serial / mos7720.c
blob51da424327b0f7c1f64ac90fe482df9e063548ea
1 /*
2 * mos7720.c
3 * Controls the Moschip 7720 usb to dual port serial convertor
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/init.h>
26 #include <linux/slab.h>
27 #include <linux/tty.h>
28 #include <linux/tty_driver.h>
29 #include <linux/tty_flip.h>
30 #include <linux/module.h>
31 #include <linux/spinlock.h>
32 #include <linux/serial.h>
33 #include <linux/serial_reg.h>
34 #include <linux/usb.h>
35 #include <linux/usb/serial.h>
36 #include <linux/uaccess.h>
37 #include <linux/parport.h>
38
39 #define DRIVER_AUTHOR "Aspire Communications pvt Ltd."
40 #define DRIVER_DESC "Moschip USB Serial Driver"
41
42 /* default urb timeout */
43 #define MOS_WDR_TIMEOUT 5000
44
45 #define MOS_MAX_PORT 0x02
46 #define MOS_WRITE 0x0E
47 #define MOS_READ 0x0D
48
49 /* Interrupt Rotinue Defines */
50 #define SERIAL_IIR_RLS 0x06
51 #define SERIAL_IIR_RDA 0x04
52 #define SERIAL_IIR_CTI 0x0c
53 #define SERIAL_IIR_THR 0x02
54 #define SERIAL_IIR_MS 0x00
55
56 #define NUM_URBS 16 /* URB Count */
57 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
58
59 /* This structure holds all of the local serial port information */
60 struct moschip_port {
61 __u8 shadowLCR; /* last LCR value received */
62 __u8 shadowMCR; /* last MCR value received */
63 __u8 shadowMSR; /* last MSR value received */
64 char open;
65 struct usb_serial_port *port; /* loop back to the owner */
66 struct urb *write_urb_pool[NUM_URBS];
67 };
68
69 static struct usb_serial_driver moschip7720_2port_driver;
70
71 #define USB_VENDOR_ID_MOSCHIP 0x9710
72 #define MOSCHIP_DEVICE_ID_7720 0x7720
73 #define MOSCHIP_DEVICE_ID_7715 0x7715
74
75 static const struct usb_device_id id_table[] = {
76 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7720) },
77 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7715) },
78 { } /* terminating entry */
79 };
80 MODULE_DEVICE_TABLE(usb, id_table);
81
82 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
83
84 /* initial values for parport regs */
85 #define DCR_INIT_VAL 0x0c /* SLCTIN, nINIT */
86 #define ECR_INIT_VAL 0x00 /* SPP mode */
87
88 struct urbtracker {
89 struct mos7715_parport *mos_parport;
90 struct list_head urblist_entry;
91 struct kref ref_count;
92 struct urb *urb;
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", 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", 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);
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_ctrlrequest setup;
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 == NULL) {
365 dev_err(&usbdev->dev, "out of memory");
366 return -ENOMEM;
367 }
368 kref_get(&mos_parport->ref_count);
369 urbtrack->mos_parport = mos_parport;
370 urbtrack->urb = usb_alloc_urb(0, GFP_ATOMIC);
371 if (urbtrack->urb == NULL) {
372 dev_err(&usbdev->dev, "out of urbs");
373 kfree(urbtrack);
374 return -ENOMEM;
375 }
376 setup.bRequestType = (__u8)0x40;
377 setup.bRequest = (__u8)0x0e;
378 setup.wValue = get_reg_value(reg, dummy);
379 setup.wIndex = get_reg_index(reg);
380 setup.wLength = 0;
381 usb_fill_control_urb(urbtrack->urb, usbdev,
382 usb_sndctrlpipe(usbdev, 0),
383 (unsigned char *)&setup,
384 NULL, 0, async_complete, urbtrack);
385 kref_init(&urbtrack->ref_count);
386 INIT_LIST_HEAD(&urbtrack->urblist_entry);
387
388 /*
389 * get the disconnect mutex, or add tracker to the deferred_urbs list
390 * and schedule a tasklet to try again later
391 */
392 if (!mutex_trylock(&serial->disc_mutex)) {
393 spin_lock_irqsave(&mos_parport->listlock, flags);
394 list_add_tail(&urbtrack->urblist_entry,
395 &mos_parport->deferred_urbs);
396 spin_unlock_irqrestore(&mos_parport->listlock, flags);
397 tasklet_schedule(&mos_parport->urb_tasklet);
398 dev_dbg(&usbdev->dev, "tasklet scheduled");
399 return 0;
400 }
401
402 /* bail if device disconnected */
403 if (serial->disconnected) {
404 kref_put(&urbtrack->ref_count, destroy_urbtracker);
405 mutex_unlock(&serial->disc_mutex);
406 return -ENODEV;
407 }
408
409 /* add the tracker to the active_urbs list and submit */
410 spin_lock_irqsave(&mos_parport->listlock, flags);
411 list_add_tail(&urbtrack->urblist_entry, &mos_parport->active_urbs);
412 spin_unlock_irqrestore(&mos_parport->listlock, flags);
413 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
414 mutex_unlock(&serial->disc_mutex);
415 if (ret_val) {
416 dev_err(&usbdev->dev,
417 "%s: submit_urb() failed: %d", __func__, ret_val);
418 spin_lock_irqsave(&mos_parport->listlock, flags);
419 list_del(&urbtrack->urblist_entry);
420 spin_unlock_irqrestore(&mos_parport->listlock, flags);
421 kref_put(&urbtrack->ref_count, destroy_urbtracker);
422 return ret_val;
423 }
424 return 0;
425 }
426
427 /*
428 * This is the the common top part of all parallel port callback operations that
429 * send synchronous messages to the device. This implements convoluted locking
430 * that avoids two scenarios: (1) a port operation is called after usbserial
431 * has called our release function, at which point struct mos7715_parport has
432 * been destroyed, and (2) the device has been disconnected, but usbserial has
433 * not called the release function yet because someone has a serial port open.
434 * The shared release_lock prevents the first, and the mutex and disconnected
435 * flag maintained by usbserial covers the second. We also use the msg_pending
436 * flag to ensure that all synchronous usb messgage calls have completed before
437 * our release function can return.
438 */
439 static int parport_prologue(struct parport *pp)
440 {
441 struct mos7715_parport *mos_parport;
442
443 spin_lock(&release_lock);
444 mos_parport = pp->private_data;
445 if (unlikely(mos_parport == NULL)) {
446 /* release fn called, port struct destroyed */
447 spin_unlock(&release_lock);
448 return -1;
449 }
450 mos_parport->msg_pending = true; /* synch usb call pending */
451 INIT_COMPLETION(mos_parport->syncmsg_compl);
452 spin_unlock(&release_lock);
453
454 mutex_lock(&mos_parport->serial->disc_mutex);
455 if (mos_parport->serial->disconnected) {
456 /* device disconnected */
457 mutex_unlock(&mos_parport->serial->disc_mutex);
458 mos_parport->msg_pending = false;
459 complete(&mos_parport->syncmsg_compl);
460 return -1;
461 }
462
463 return 0;
464 }
465
466 /*
467 * This is the the common bottom part of all parallel port functions that send
468 * synchronous messages to the device.
469 */
470 static inline void parport_epilogue(struct parport *pp)
471 {
472 struct mos7715_parport *mos_parport = pp->private_data;
473 mutex_unlock(&mos_parport->serial->disc_mutex);
474 mos_parport->msg_pending = false;
475 complete(&mos_parport->syncmsg_compl);
476 }
477
478 static void parport_mos7715_write_data(struct parport *pp, unsigned char d)
479 {
480 struct mos7715_parport *mos_parport = pp->private_data;
481
482 if (parport_prologue(pp) < 0)
483 return;
484 mos7715_change_mode(mos_parport, SPP);
485 write_mos_reg(mos_parport->serial, dummy, DPR, (__u8)d);
486 parport_epilogue(pp);
487 }
488
489 static unsigned char parport_mos7715_read_data(struct parport *pp)
490 {
491 struct mos7715_parport *mos_parport = pp->private_data;
492 unsigned char d;
493
494 if (parport_prologue(pp) < 0)
495 return 0;
496 read_mos_reg(mos_parport->serial, dummy, DPR, &d);
497 parport_epilogue(pp);
498 return d;
499 }
500
501 static void parport_mos7715_write_control(struct parport *pp, unsigned char d)
502 {
503 struct mos7715_parport *mos_parport = pp->private_data;
504 __u8 data;
505
506 if (parport_prologue(pp) < 0)
507 return;
508 data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0);
509 write_mos_reg(mos_parport->serial, dummy, DCR, data);
510 mos_parport->shadowDCR = data;
511 parport_epilogue(pp);
512 }
513
514 static unsigned char parport_mos7715_read_control(struct parport *pp)
515 {
516 struct mos7715_parport *mos_parport = pp->private_data;
517 __u8 dcr;
518
519 spin_lock(&release_lock);
520 mos_parport = pp->private_data;
521 if (unlikely(mos_parport == NULL)) {
522 spin_unlock(&release_lock);
523 return 0;
524 }
525 dcr = mos_parport->shadowDCR & 0x0f;
526 spin_unlock(&release_lock);
527 return dcr;
528 }
529
530 static unsigned char parport_mos7715_frob_control(struct parport *pp,
531 unsigned char mask,
532 unsigned char val)
533 {
534 struct mos7715_parport *mos_parport = pp->private_data;
535 __u8 dcr;
536
537 mask &= 0x0f;
538 val &= 0x0f;
539 if (parport_prologue(pp) < 0)
540 return 0;
541 mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val;
542 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
543 dcr = mos_parport->shadowDCR & 0x0f;
544 parport_epilogue(pp);
545 return dcr;
546 }
547
548 static unsigned char parport_mos7715_read_status(struct parport *pp)
549 {
550 unsigned char status;
551 struct mos7715_parport *mos_parport = pp->private_data;
552
553 spin_lock(&release_lock);
554 mos_parport = pp->private_data;
555 if (unlikely(mos_parport == NULL)) { /* release called */
556 spin_unlock(&release_lock);
557 return 0;
558 }
559 status = atomic_read(&mos_parport->shadowDSR) & 0xf8;
560 spin_unlock(&release_lock);
561 return status;
562 }
563
564 static void parport_mos7715_enable_irq(struct parport *pp)
565 {
566 }
567
568 static void parport_mos7715_disable_irq(struct parport *pp)
569 {
570 }
571
572 static void parport_mos7715_data_forward(struct parport *pp)
573 {
574 struct mos7715_parport *mos_parport = pp->private_data;
575
576 if (parport_prologue(pp) < 0)
577 return;
578 mos7715_change_mode(mos_parport, PS2);
579 mos_parport->shadowDCR &= ~0x20;
580 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
581 parport_epilogue(pp);
582 }
583
584 static void parport_mos7715_data_reverse(struct parport *pp)
585 {
586 struct mos7715_parport *mos_parport = pp->private_data;
587
588 if (parport_prologue(pp) < 0)
589 return;
590 mos7715_change_mode(mos_parport, PS2);
591 mos_parport->shadowDCR |= 0x20;
592 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
593 parport_epilogue(pp);
594 }
595
596 static void parport_mos7715_init_state(struct pardevice *dev,
597 struct parport_state *s)
598 {
599 s->u.pc.ctr = DCR_INIT_VAL;
600 s->u.pc.ecr = ECR_INIT_VAL;
601 }
602
603 /* N.B. Parport core code requires that this function not block */
604 static void parport_mos7715_save_state(struct parport *pp,
605 struct parport_state *s)
606 {
607 struct mos7715_parport *mos_parport;
608
609 spin_lock(&release_lock);
610 mos_parport = pp->private_data;
611 if (unlikely(mos_parport == NULL)) { /* release called */
612 spin_unlock(&release_lock);
613 return;
614 }
615 s->u.pc.ctr = mos_parport->shadowDCR;
616 s->u.pc.ecr = mos_parport->shadowECR;
617 spin_unlock(&release_lock);
618 }
619
620 /* N.B. Parport core code requires that this function not block */
621 static void parport_mos7715_restore_state(struct parport *pp,
622 struct parport_state *s)
623 {
624 struct mos7715_parport *mos_parport;
625
626 spin_lock(&release_lock);
627 mos_parport = pp->private_data;
628 if (unlikely(mos_parport == NULL)) { /* release called */
629 spin_unlock(&release_lock);
630 return;
631 }
632 write_parport_reg_nonblock(mos_parport, DCR, mos_parport->shadowDCR);
633 write_parport_reg_nonblock(mos_parport, ECR, mos_parport->shadowECR);
634 spin_unlock(&release_lock);
635 }
636
637 static size_t parport_mos7715_write_compat(struct parport *pp,
638 const void *buffer,
639 size_t len, int flags)
640 {
641 int retval;
642 struct mos7715_parport *mos_parport = pp->private_data;
643 int actual_len;
644
645 if (parport_prologue(pp) < 0)
646 return 0;
647 mos7715_change_mode(mos_parport, PPF);
648 retval = usb_bulk_msg(mos_parport->serial->dev,
649 usb_sndbulkpipe(mos_parport->serial->dev, 2),
650 (void *)buffer, len, &actual_len,
651 MOS_WDR_TIMEOUT);
652 parport_epilogue(pp);
653 if (retval) {
654 dev_err(&mos_parport->serial->dev->dev,
655 "mos7720: usb_bulk_msg() failed: %d", retval);
656 return 0;
657 }
658 return actual_len;
659 }
660
661 static struct parport_operations parport_mos7715_ops = {
662 .owner = THIS_MODULE,
663 .write_data = parport_mos7715_write_data,
664 .read_data = parport_mos7715_read_data,
665
666 .write_control = parport_mos7715_write_control,
667 .read_control = parport_mos7715_read_control,
668 .frob_control = parport_mos7715_frob_control,
669
670 .read_status = parport_mos7715_read_status,
671
672 .enable_irq = parport_mos7715_enable_irq,
673 .disable_irq = parport_mos7715_disable_irq,
674
675 .data_forward = parport_mos7715_data_forward,
676 .data_reverse = parport_mos7715_data_reverse,
677
678 .init_state = parport_mos7715_init_state,
679 .save_state = parport_mos7715_save_state,
680 .restore_state = parport_mos7715_restore_state,
681
682 .compat_write_data = parport_mos7715_write_compat,
683
684 .nibble_read_data = parport_ieee1284_read_nibble,
685 .byte_read_data = parport_ieee1284_read_byte,
686 };
687
688 /*
689 * Allocate and initialize parallel port control struct, initialize
690 * the parallel port hardware device, and register with the parport subsystem.
691 */
692 static int mos7715_parport_init(struct usb_serial *serial)
693 {
694 struct mos7715_parport *mos_parport;
695
696 /* allocate and initialize parallel port control struct */
697 mos_parport = kzalloc(sizeof(struct mos7715_parport), GFP_KERNEL);
698 if (mos_parport == NULL) {
699 dev_dbg(&serial->dev->dev, "%s: kzalloc failed\n", __func__);
700 return -ENOMEM;
701 }
702 mos_parport->msg_pending = false;
703 kref_init(&mos_parport->ref_count);
704 spin_lock_init(&mos_parport->listlock);
705 INIT_LIST_HEAD(&mos_parport->active_urbs);
706 INIT_LIST_HEAD(&mos_parport->deferred_urbs);
707 usb_set_serial_data(serial, mos_parport); /* hijack private pointer */
708 mos_parport->serial = serial;
709 tasklet_init(&mos_parport->urb_tasklet, send_deferred_urbs,
710 (unsigned long) mos_parport);
711 init_completion(&mos_parport->syncmsg_compl);
712
713 /* cycle parallel port reset bit */
714 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x80);
715 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x00);
716
717 /* initialize device registers */
718 mos_parport->shadowDCR = DCR_INIT_VAL;
719 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
720 mos_parport->shadowECR = ECR_INIT_VAL;
721 write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR);
722
723 /* register with parport core */
724 mos_parport->pp = parport_register_port(0, PARPORT_IRQ_NONE,
725 PARPORT_DMA_NONE,
726 &parport_mos7715_ops);
727 if (mos_parport->pp == NULL) {
728 dev_err(&serial->interface->dev,
729 "Could not register parport\n");
730 kref_put(&mos_parport->ref_count, destroy_mos_parport);
731 return -EIO;
732 }
733 mos_parport->pp->private_data = mos_parport;
734 mos_parport->pp->modes = PARPORT_MODE_COMPAT | PARPORT_MODE_PCSPP;
735 mos_parport->pp->dev = &serial->interface->dev;
736 parport_announce_port(mos_parport->pp);
737
738 return 0;
739 }
740 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
741
742 /*
743 * mos7720_interrupt_callback
744 * this is the callback function for when we have received data on the
745 * interrupt endpoint.
746 */
747 static void mos7720_interrupt_callback(struct urb *urb)
748 {
749 int result;
750 int length;
751 int status = urb->status;
752 struct device *dev = &urb->dev->dev;
753 __u8 *data;
754 __u8 sp1;
755 __u8 sp2;
756
757 switch (status) {
758 case 0:
759 /* success */
760 break;
761 case -ECONNRESET:
762 case -ENOENT:
763 case -ESHUTDOWN:
764 /* this urb is terminated, clean up */
765 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
766 return;
767 default:
768 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
769 goto exit;
770 }
771
772 length = urb->actual_length;
773 data = urb->transfer_buffer;
774
775 /* Moschip get 4 bytes
776 * Byte 1 IIR Port 1 (port.number is 0)
777 * Byte 2 IIR Port 2 (port.number is 1)
778 * Byte 3 --------------
779 * Byte 4 FIFO status for both */
780
781 /* the above description is inverted
782 * oneukum 2007-03-14 */
783
784 if (unlikely(length != 4)) {
785 dev_dbg(dev, "Wrong data !!!\n");
786 return;
787 }
788
789 sp1 = data[3];
790 sp2 = data[2];
791
792 if ((sp1 | sp2) & 0x01) {
793 /* No Interrupt Pending in both the ports */
794 dev_dbg(dev, "No Interrupt !!!\n");
795 } else {
796 switch (sp1 & 0x0f) {
797 case SERIAL_IIR_RLS:
798 dev_dbg(dev, "Serial Port 1: Receiver status error or address bit detected in 9-bit mode\n");
799 break;
800 case SERIAL_IIR_CTI:
801 dev_dbg(dev, "Serial Port 1: Receiver time out\n");
802 break;
803 case SERIAL_IIR_MS:
804 /* dev_dbg(dev, "Serial Port 1: Modem status change\n"); */
805 break;
806 }
807
808 switch (sp2 & 0x0f) {
809 case SERIAL_IIR_RLS:
810 dev_dbg(dev, "Serial Port 2: Receiver status error or address bit detected in 9-bit mode\n");
811 break;
812 case SERIAL_IIR_CTI:
813 dev_dbg(dev, "Serial Port 2: Receiver time out\n");
814 break;
815 case SERIAL_IIR_MS:
816 /* dev_dbg(dev, "Serial Port 2: Modem status change\n"); */
817 break;
818 }
819 }
820
821 exit:
822 result = usb_submit_urb(urb, GFP_ATOMIC);
823 if (result)
824 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result);
825 }
826
827 /*
828 * mos7715_interrupt_callback
829 * this is the 7715's callback function for when we have received data on
830 * the interrupt endpoint.
831 */
832 static void mos7715_interrupt_callback(struct urb *urb)
833 {
834 int result;
835 int length;
836 int status = urb->status;
837 struct device *dev = &urb->dev->dev;
838 __u8 *data;
839 __u8 iir;
840
841 switch (status) {
842 case 0:
843 /* success */
844 break;
845 case -ECONNRESET:
846 case -ENOENT:
847 case -ESHUTDOWN:
848 case -ENODEV:
849 /* this urb is terminated, clean up */
850 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
851 return;
852 default:
853 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
854 goto exit;
855 }
856
857 length = urb->actual_length;
858 data = urb->transfer_buffer;
859
860 /* Structure of data from 7715 device:
861 * Byte 1: IIR serial Port
862 * Byte 2: unused
863 * Byte 2: DSR parallel port
864 * Byte 4: FIFO status for both */
865
866 if (unlikely(length != 4)) {
867 dev_dbg(dev, "Wrong data !!!\n");
868 return;
869 }
870
871 iir = data[0];
872 if (!(iir & 0x01)) { /* serial port interrupt pending */
873 switch (iir & 0x0f) {
874 case SERIAL_IIR_RLS:
875 dev_dbg(dev, "Serial Port: Receiver status error or address bit detected in 9-bit mode\n\n");
876 break;
877 case SERIAL_IIR_CTI:
878 dev_dbg(dev, "Serial Port: Receiver time out\n");
879 break;
880 case SERIAL_IIR_MS:
881 /* dev_dbg(dev, "Serial Port: Modem status change\n"); */
882 break;
883 }
884 }
885
886 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
887 { /* update local copy of DSR reg */
888 struct usb_serial_port *port = urb->context;
889 struct mos7715_parport *mos_parport = port->serial->private;
890 if (unlikely(mos_parport == NULL))
891 return;
892 atomic_set(&mos_parport->shadowDSR, data[2]);
893 }
894 #endif
895
896 exit:
897 result = usb_submit_urb(urb, GFP_ATOMIC);
898 if (result)
899 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result);
900 }
901
902 /*
903 * mos7720_bulk_in_callback
904 * this is the callback function for when we have received data on the
905 * bulk in endpoint.
906 */
907 static void mos7720_bulk_in_callback(struct urb *urb)
908 {
909 int retval;
910 unsigned char *data ;
911 struct usb_serial_port *port;
912 int status = urb->status;
913
914 if (status) {
915 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
916 return;
917 }
918
919 port = urb->context;
920
921 dev_dbg(&port->dev, "Entering...%s\n", __func__);
922
923 data = urb->transfer_buffer;
924
925 if (urb->actual_length) {
926 tty_insert_flip_string(&port->port, data, urb->actual_length);
927 tty_flip_buffer_push(&port->port);
928 }
929
930 if (port->read_urb->status != -EINPROGRESS) {
931 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
932 if (retval)
933 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
934 }
935 }
936
937 /*
938 * mos7720_bulk_out_data_callback
939 * this is the callback function for when we have finished sending serial
940 * data on the bulk out endpoint.
941 */
942 static void mos7720_bulk_out_data_callback(struct urb *urb)
943 {
944 struct moschip_port *mos7720_port;
945 int status = urb->status;
946
947 if (status) {
948 dev_dbg(&urb->dev->dev, "nonzero write bulk status received:%d\n", status);
949 return;
950 }
951
952 mos7720_port = urb->context;
953 if (!mos7720_port) {
954 dev_dbg(&urb->dev->dev, "NULL mos7720_port pointer\n");
955 return ;
956 }
957
958 if (mos7720_port->open)
959 tty_port_tty_wakeup(&mos7720_port->port->port);
960 }
961
962 /*
963 * mos77xx_probe
964 * this function installs the appropriate read interrupt endpoint callback
965 * depending on whether the device is a 7720 or 7715, thus avoiding costly
966 * run-time checks in the high-frequency callback routine itself.
967 */
968 static int mos77xx_probe(struct usb_serial *serial,
969 const struct usb_device_id *id)
970 {
971 if (id->idProduct == MOSCHIP_DEVICE_ID_7715)
972 moschip7720_2port_driver.read_int_callback =
973 mos7715_interrupt_callback;
974 else
975 moschip7720_2port_driver.read_int_callback =
976 mos7720_interrupt_callback;
977
978 return 0;
979 }
980
981 static int mos77xx_calc_num_ports(struct usb_serial *serial)
982 {
983 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
984 if (product == MOSCHIP_DEVICE_ID_7715)
985 return 1;
986
987 return 2;
988 }
989
990 static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port)
991 {
992 struct usb_serial *serial;
993 struct urb *urb;
994 struct moschip_port *mos7720_port;
995 int response;
996 int port_number;
997 __u8 data;
998 int allocated_urbs = 0;
999 int j;
1000
1001 serial = port->serial;
1002
1003 mos7720_port = usb_get_serial_port_data(port);
1004 if (mos7720_port == NULL)
1005 return -ENODEV;
1006
1007 usb_clear_halt(serial->dev, port->write_urb->pipe);
1008 usb_clear_halt(serial->dev, port->read_urb->pipe);
1009
1010 /* Initialising the write urb pool */
1011 for (j = 0; j < NUM_URBS; ++j) {
1012 urb = usb_alloc_urb(0, GFP_KERNEL);
1013 mos7720_port->write_urb_pool[j] = urb;
1014
1015 if (urb == NULL) {
1016 dev_err(&port->dev, "No more urbs???\n");
1017 continue;
1018 }
1019
1020 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1021 GFP_KERNEL);
1022 if (!urb->transfer_buffer) {
1023 dev_err(&port->dev,
1024 "%s-out of memory for urb buffers.\n",
1025 __func__);
1026 usb_free_urb(mos7720_port->write_urb_pool[j]);
1027 mos7720_port->write_urb_pool[j] = NULL;
1028 continue;
1029 }
1030 allocated_urbs++;
1031 }
1032
1033 if (!allocated_urbs)
1034 return -ENOMEM;
1035
1036 /* Initialize MCS7720 -- Write Init values to corresponding Registers
1037 *
1038 * Register Index
1039 * 0 : THR/RHR
1040 * 1 : IER
1041 * 2 : FCR
1042 * 3 : LCR
1043 * 4 : MCR
1044 * 5 : LSR
1045 * 6 : MSR
1046 * 7 : SPR
1047 *
1048 * 0x08 : SP1/2 Control Reg
1049 */
1050 port_number = port->port_number;
1051 read_mos_reg(serial, port_number, LSR, &data);
1052
1053 dev_dbg(&port->dev, "SS::%p LSR:%x\n", mos7720_port, data);
1054
1055 write_mos_reg(serial, dummy, SP1_REG, 0x02);
1056 write_mos_reg(serial, dummy, SP2_REG, 0x02);
1057
1058 write_mos_reg(serial, port_number, IER, 0x00);
1059 write_mos_reg(serial, port_number, FCR, 0x00);
1060
1061 write_mos_reg(serial, port_number, FCR, 0xcf);
1062 mos7720_port->shadowLCR = 0x03;
1063 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1064 mos7720_port->shadowMCR = 0x0b;
1065 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1066
1067 write_mos_reg(serial, port_number, SP_CONTROL_REG, 0x00);
1068 read_mos_reg(serial, dummy, SP_CONTROL_REG, &data);
1069 data = data | (port->port_number + 1);
1070 write_mos_reg(serial, dummy, SP_CONTROL_REG, data);
1071 mos7720_port->shadowLCR = 0x83;
1072 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1073 write_mos_reg(serial, port_number, THR, 0x0c);
1074 write_mos_reg(serial, port_number, IER, 0x00);
1075 mos7720_port->shadowLCR = 0x03;
1076 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1077 write_mos_reg(serial, port_number, IER, 0x0c);
1078
1079 response = usb_submit_urb(port->read_urb, GFP_KERNEL);
1080 if (response)
1081 dev_err(&port->dev, "%s - Error %d submitting read urb\n",
1082 __func__, response);
1083
1084 /* initialize our port settings */
1085 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */
1086
1087 /* send a open port command */
1088 mos7720_port->open = 1;
1089
1090 return 0;
1091 }
1092
1093 /*
1094 * mos7720_chars_in_buffer
1095 * this function is called by the tty driver when it wants to know how many
1096 * bytes of data we currently have outstanding in the port (data that has
1097 * been written, but hasn't made it out the port yet)
1098 * If successful, we return the number of bytes left to be written in the
1099 * system,
1100 * Otherwise we return a negative error number.
1101 */
1102 static int mos7720_chars_in_buffer(struct tty_struct *tty)
1103 {
1104 struct usb_serial_port *port = tty->driver_data;
1105 int i;
1106 int chars = 0;
1107 struct moschip_port *mos7720_port;
1108
1109 mos7720_port = usb_get_serial_port_data(port);
1110 if (mos7720_port == NULL)
1111 return 0;
1112
1113 for (i = 0; i < NUM_URBS; ++i) {
1114 if (mos7720_port->write_urb_pool[i] &&
1115 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS)
1116 chars += URB_TRANSFER_BUFFER_SIZE;
1117 }
1118 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1119 return chars;
1120 }
1121
1122 static void mos7720_close(struct usb_serial_port *port)
1123 {
1124 struct usb_serial *serial;
1125 struct moschip_port *mos7720_port;
1126 int j;
1127
1128 serial = port->serial;
1129
1130 mos7720_port = usb_get_serial_port_data(port);
1131 if (mos7720_port == NULL)
1132 return;
1133
1134 for (j = 0; j < NUM_URBS; ++j)
1135 usb_kill_urb(mos7720_port->write_urb_pool[j]);
1136
1137 /* Freeing Write URBs */
1138 for (j = 0; j < NUM_URBS; ++j) {
1139 if (mos7720_port->write_urb_pool[j]) {
1140 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer);
1141 usb_free_urb(mos7720_port->write_urb_pool[j]);
1142 }
1143 }
1144
1145 /* While closing port, shutdown all bulk read, write *
1146 * and interrupt read if they exists, otherwise nop */
1147 usb_kill_urb(port->write_urb);
1148 usb_kill_urb(port->read_urb);
1149
1150 write_mos_reg(serial, port->port_number, MCR, 0x00);
1151 write_mos_reg(serial, port->port_number, IER, 0x00);
1152
1153 mos7720_port->open = 0;
1154 }
1155
1156 static void mos7720_break(struct tty_struct *tty, int break_state)
1157 {
1158 struct usb_serial_port *port = tty->driver_data;
1159 unsigned char data;
1160 struct usb_serial *serial;
1161 struct moschip_port *mos7720_port;
1162
1163 serial = port->serial;
1164
1165 mos7720_port = usb_get_serial_port_data(port);
1166 if (mos7720_port == NULL)
1167 return;
1168
1169 if (break_state == -1)
1170 data = mos7720_port->shadowLCR | UART_LCR_SBC;
1171 else
1172 data = mos7720_port->shadowLCR & ~UART_LCR_SBC;
1173
1174 mos7720_port->shadowLCR = data;
1175 write_mos_reg(serial, port->port_number, LCR, mos7720_port->shadowLCR);
1176 }
1177
1178 /*
1179 * mos7720_write_room
1180 * this function is called by the tty driver when it wants to know how many
1181 * bytes of data we can accept for a specific port.
1182 * If successful, we return the amount of room that we have for this port
1183 * Otherwise we return a negative error number.
1184 */
1185 static int mos7720_write_room(struct tty_struct *tty)
1186 {
1187 struct usb_serial_port *port = tty->driver_data;
1188 struct moschip_port *mos7720_port;
1189 int room = 0;
1190 int i;
1191
1192 mos7720_port = usb_get_serial_port_data(port);
1193 if (mos7720_port == NULL)
1194 return -ENODEV;
1195
1196 /* FIXME: Locking */
1197 for (i = 0; i < NUM_URBS; ++i) {
1198 if (mos7720_port->write_urb_pool[i] &&
1199 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS)
1200 room += URB_TRANSFER_BUFFER_SIZE;
1201 }
1202
1203 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
1204 return room;
1205 }
1206
1207 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port,
1208 const unsigned char *data, int count)
1209 {
1210 int status;
1211 int i;
1212 int bytes_sent = 0;
1213 int transfer_size;
1214
1215 struct moschip_port *mos7720_port;
1216 struct usb_serial *serial;
1217 struct urb *urb;
1218 const unsigned char *current_position = data;
1219
1220 serial = port->serial;
1221
1222 mos7720_port = usb_get_serial_port_data(port);
1223 if (mos7720_port == NULL)
1224 return -ENODEV;
1225
1226 /* try to find a free urb in the list */
1227 urb = NULL;
1228
1229 for (i = 0; i < NUM_URBS; ++i) {
1230 if (mos7720_port->write_urb_pool[i] &&
1231 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) {
1232 urb = mos7720_port->write_urb_pool[i];
1233 dev_dbg(&port->dev, "URB:%d\n", i);
1234 break;
1235 }
1236 }
1237
1238 if (urb == NULL) {
1239 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1240 goto exit;
1241 }
1242
1243 if (urb->transfer_buffer == NULL) {
1244 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1245 GFP_KERNEL);
1246 if (urb->transfer_buffer == NULL) {
1247 dev_err_console(port, "%s no more kernel memory...\n",
1248 __func__);
1249 goto exit;
1250 }
1251 }
1252 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1253
1254 memcpy(urb->transfer_buffer, current_position, transfer_size);
1255 usb_serial_debug_data(&port->dev, __func__, transfer_size,
1256 urb->transfer_buffer);
1257
1258 /* fill urb with data and submit */
1259 usb_fill_bulk_urb(urb, serial->dev,
1260 usb_sndbulkpipe(serial->dev,
1261 port->bulk_out_endpointAddress),
1262 urb->transfer_buffer, transfer_size,
1263 mos7720_bulk_out_data_callback, mos7720_port);
1264
1265 /* send it down the pipe */
1266 status = usb_submit_urb(urb, GFP_ATOMIC);
1267 if (status) {
1268 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1269 "with status = %d\n", __func__, status);
1270 bytes_sent = status;
1271 goto exit;
1272 }
1273 bytes_sent = transfer_size;
1274
1275 exit:
1276 return bytes_sent;
1277 }
1278
1279 static void mos7720_throttle(struct tty_struct *tty)
1280 {
1281 struct usb_serial_port *port = tty->driver_data;
1282 struct moschip_port *mos7720_port;
1283 int status;
1284
1285 mos7720_port = usb_get_serial_port_data(port);
1286
1287 if (mos7720_port == NULL)
1288 return;
1289
1290 if (!mos7720_port->open) {
1291 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1292 return;
1293 }
1294
1295 /* if we are implementing XON/XOFF, send the stop character */
1296 if (I_IXOFF(tty)) {
1297 unsigned char stop_char = STOP_CHAR(tty);
1298 status = mos7720_write(tty, port, &stop_char, 1);
1299 if (status <= 0)
1300 return;
1301 }
1302
1303 /* if we are implementing RTS/CTS, toggle that line */
1304 if (tty->termios.c_cflag & CRTSCTS) {
1305 mos7720_port->shadowMCR &= ~UART_MCR_RTS;
1306 write_mos_reg(port->serial, port->port_number, MCR,
1307 mos7720_port->shadowMCR);
1308 if (status != 0)
1309 return;
1310 }
1311 }
1312
1313 static void mos7720_unthrottle(struct tty_struct *tty)
1314 {
1315 struct usb_serial_port *port = tty->driver_data;
1316 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1317 int status;
1318
1319 if (mos7720_port == NULL)
1320 return;
1321
1322 if (!mos7720_port->open) {
1323 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1324 return;
1325 }
1326
1327 /* if we are implementing XON/XOFF, send the start character */
1328 if (I_IXOFF(tty)) {
1329 unsigned char start_char = START_CHAR(tty);
1330 status = mos7720_write(tty, port, &start_char, 1);
1331 if (status <= 0)
1332 return;
1333 }
1334
1335 /* if we are implementing RTS/CTS, toggle that line */
1336 if (tty->termios.c_cflag & CRTSCTS) {
1337 mos7720_port->shadowMCR |= UART_MCR_RTS;
1338 write_mos_reg(port->serial, port->port_number, MCR,
1339 mos7720_port->shadowMCR);
1340 if (status != 0)
1341 return;
1342 }
1343 }
1344
1345 /* FIXME: this function does not work */
1346 static int set_higher_rates(struct moschip_port *mos7720_port,
1347 unsigned int baud)
1348 {
1349 struct usb_serial_port *port;
1350 struct usb_serial *serial;
1351 int port_number;
1352 enum mos_regs sp_reg;
1353 if (mos7720_port == NULL)
1354 return -EINVAL;
1355
1356 port = mos7720_port->port;
1357 serial = port->serial;
1358
1359 /***********************************************
1360 * Init Sequence for higher rates
1361 ***********************************************/
1362 dev_dbg(&port->dev, "Sending Setting Commands ..........\n");
1363 port_number = port->port_number;
1364
1365 write_mos_reg(serial, port_number, IER, 0x00);
1366 write_mos_reg(serial, port_number, FCR, 0x00);
1367 write_mos_reg(serial, port_number, FCR, 0xcf);
1368 mos7720_port->shadowMCR = 0x0b;
1369 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1370 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x00);
1371
1372 /***********************************************
1373 * Set for higher rates *
1374 ***********************************************/
1375 /* writing baud rate verbatum into uart clock field clearly not right */
1376 if (port_number == 0)
1377 sp_reg = SP1_REG;
1378 else
1379 sp_reg = SP2_REG;
1380 write_mos_reg(serial, dummy, sp_reg, baud * 0x10);
1381 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x03);
1382 mos7720_port->shadowMCR = 0x2b;
1383 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1384
1385 /***********************************************
1386 * Set DLL/DLM
1387 ***********************************************/
1388 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1389 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1390 write_mos_reg(serial, port_number, DLL, 0x01);
1391 write_mos_reg(serial, port_number, DLM, 0x00);
1392 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1393 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1394
1395 return 0;
1396 }
1397
1398 /* baud rate information */
1399 struct divisor_table_entry {
1400 __u32 baudrate;
1401 __u16 divisor;
1402 };
1403
1404 /* Define table of divisors for moschip 7720 hardware *
1405 * These assume a 3.6864MHz crystal, the standard /16, and *
1406 * MCR.7 = 0. */
1407 static struct divisor_table_entry divisor_table[] = {
1408 { 50, 2304},
1409 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */
1410 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */
1411 { 150, 768},
1412 { 300, 384},
1413 { 600, 192},
1414 { 1200, 96},
1415 { 1800, 64},
1416 { 2400, 48},
1417 { 4800, 24},
1418 { 7200, 16},
1419 { 9600, 12},
1420 { 19200, 6},
1421 { 38400, 3},
1422 { 57600, 2},
1423 { 115200, 1},
1424 };
1425
1426 /*****************************************************************************
1427 * calc_baud_rate_divisor
1428 * this function calculates the proper baud rate divisor for the specified
1429 * baud rate.
1430 *****************************************************************************/
1431 static int calc_baud_rate_divisor(struct usb_serial_port *port, int baudrate, int *divisor)
1432 {
1433 int i;
1434 __u16 custom;
1435 __u16 round1;
1436 __u16 round;
1437
1438
1439 dev_dbg(&port->dev, "%s - %d\n", __func__, baudrate);
1440
1441 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) {
1442 if (divisor_table[i].baudrate == baudrate) {
1443 *divisor = divisor_table[i].divisor;
1444 return 0;
1445 }
1446 }
1447
1448 /* After trying for all the standard baud rates *
1449 * Try calculating the divisor for this baud rate */
1450 if (baudrate > 75 && baudrate < 230400) {
1451 /* get the divisor */
1452 custom = (__u16)(230400L / baudrate);
1453
1454 /* Check for round off */
1455 round1 = (__u16)(2304000L / baudrate);
1456 round = (__u16)(round1 - (custom * 10));
1457 if (round > 4)
1458 custom++;
1459 *divisor = custom;
1460
1461 dev_dbg(&port->dev, "Baud %d = %d\n", baudrate, custom);
1462 return 0;
1463 }
1464
1465 dev_dbg(&port->dev, "Baud calculation Failed...\n");
1466 return -EINVAL;
1467 }
1468
1469 /*
1470 * send_cmd_write_baud_rate
1471 * this function sends the proper command to change the baud rate of the
1472 * specified port.
1473 */
1474 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port,
1475 int baudrate)
1476 {
1477 struct usb_serial_port *port;
1478 struct usb_serial *serial;
1479 int divisor;
1480 int status;
1481 unsigned char number;
1482
1483 if (mos7720_port == NULL)
1484 return -1;
1485
1486 port = mos7720_port->port;
1487 serial = port->serial;
1488
1489 number = port->port_number;
1490 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudrate);
1491
1492 /* Calculate the Divisor */
1493 status = calc_baud_rate_divisor(port, baudrate, &divisor);
1494 if (status) {
1495 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1496 return status;
1497 }
1498
1499 /* Enable access to divisor latch */
1500 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1501 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR);
1502
1503 /* Write the divisor */
1504 write_mos_reg(serial, number, DLL, (__u8)(divisor & 0xff));
1505 write_mos_reg(serial, number, DLM, (__u8)((divisor & 0xff00) >> 8));
1506
1507 /* Disable access to divisor latch */
1508 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1509 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR);
1510
1511 return status;
1512 }
1513
1514 /*
1515 * change_port_settings
1516 * This routine is called to set the UART on the device to match
1517 * the specified new settings.
1518 */
1519 static void change_port_settings(struct tty_struct *tty,
1520 struct moschip_port *mos7720_port,
1521 struct ktermios *old_termios)
1522 {
1523 struct usb_serial_port *port;
1524 struct usb_serial *serial;
1525 int baud;
1526 unsigned cflag;
1527 unsigned iflag;
1528 __u8 mask = 0xff;
1529 __u8 lData;
1530 __u8 lParity;
1531 __u8 lStop;
1532 int status;
1533 int port_number;
1534
1535 if (mos7720_port == NULL)
1536 return ;
1537
1538 port = mos7720_port->port;
1539 serial = port->serial;
1540 port_number = port->port_number;
1541
1542 if (!mos7720_port->open) {
1543 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1544 return;
1545 }
1546
1547 lData = UART_LCR_WLEN8;
1548 lStop = 0x00; /* 1 stop bit */
1549 lParity = 0x00; /* No parity */
1550
1551 cflag = tty->termios.c_cflag;
1552 iflag = tty->termios.c_iflag;
1553
1554 /* Change the number of bits */
1555 switch (cflag & CSIZE) {
1556 case CS5:
1557 lData = UART_LCR_WLEN5;
1558 mask = 0x1f;
1559 break;
1560
1561 case CS6:
1562 lData = UART_LCR_WLEN6;
1563 mask = 0x3f;
1564 break;
1565
1566 case CS7:
1567 lData = UART_LCR_WLEN7;
1568 mask = 0x7f;
1569 break;
1570 default:
1571 case CS8:
1572 lData = UART_LCR_WLEN8;
1573 break;
1574 }
1575
1576 /* Change the Parity bit */
1577 if (cflag & PARENB) {
1578 if (cflag & PARODD) {
1579 lParity = UART_LCR_PARITY;
1580 dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1581 } else {
1582 lParity = (UART_LCR_EPAR | UART_LCR_PARITY);
1583 dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1584 }
1585
1586 } else {
1587 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1588 }
1589
1590 if (cflag & CMSPAR)
1591 lParity = lParity | 0x20;
1592
1593 /* Change the Stop bit */
1594 if (cflag & CSTOPB) {
1595 lStop = UART_LCR_STOP;
1596 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1597 } else {
1598 lStop = 0x00;
1599 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1600 }
1601
1602 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
1603 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
1604 #define LCR_PAR_MASK 0x38 /* Mask for parity field */
1605
1606 /* Update the LCR with the correct value */
1607 mos7720_port->shadowLCR &=
1608 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1609 mos7720_port->shadowLCR |= (lData | lParity | lStop);
1610
1611
1612 /* Disable Interrupts */
1613 write_mos_reg(serial, port_number, IER, 0x00);
1614 write_mos_reg(serial, port_number, FCR, 0x00);
1615 write_mos_reg(serial, port_number, FCR, 0xcf);
1616
1617 /* Send the updated LCR value to the mos7720 */
1618 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1619 mos7720_port->shadowMCR = 0x0b;
1620 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1621
1622 /* set up the MCR register and send it to the mos7720 */
1623 mos7720_port->shadowMCR = UART_MCR_OUT2;
1624 if (cflag & CBAUD)
1625 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS);
1626
1627 if (cflag & CRTSCTS) {
1628 mos7720_port->shadowMCR |= (UART_MCR_XONANY);
1629 /* To set hardware flow control to the specified *
1630 * serial port, in SP1/2_CONTROL_REG */
1631 if (port_number)
1632 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x01);
1633 else
1634 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x02);
1635
1636 } else
1637 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY);
1638
1639 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1640
1641 /* Determine divisor based on baud rate */
1642 baud = tty_get_baud_rate(tty);
1643 if (!baud) {
1644 /* pick a default, any default... */
1645 dev_dbg(&port->dev, "Picked default baud...\n");
1646 baud = 9600;
1647 }
1648
1649 if (baud >= 230400) {
1650 set_higher_rates(mos7720_port, baud);
1651 /* Enable Interrupts */
1652 write_mos_reg(serial, port_number, IER, 0x0c);
1653 return;
1654 }
1655
1656 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1657 status = send_cmd_write_baud_rate(mos7720_port, baud);
1658 /* FIXME: needs to write actual resulting baud back not just
1659 blindly do so */
1660 if (cflag & CBAUD)
1661 tty_encode_baud_rate(tty, baud, baud);
1662 /* Enable Interrupts */
1663 write_mos_reg(serial, port_number, IER, 0x0c);
1664
1665 if (port->read_urb->status != -EINPROGRESS) {
1666 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1667 if (status)
1668 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status);
1669 }
1670 }
1671
1672 /*
1673 * mos7720_set_termios
1674 * this function is called by the tty driver when it wants to change the
1675 * termios structure.
1676 */
1677 static void mos7720_set_termios(struct tty_struct *tty,
1678 struct usb_serial_port *port, struct ktermios *old_termios)
1679 {
1680 int status;
1681 unsigned int cflag;
1682 struct usb_serial *serial;
1683 struct moschip_port *mos7720_port;
1684
1685 serial = port->serial;
1686
1687 mos7720_port = usb_get_serial_port_data(port);
1688
1689 if (mos7720_port == NULL)
1690 return;
1691
1692 if (!mos7720_port->open) {
1693 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1694 return;
1695 }
1696
1697 dev_dbg(&port->dev, "setting termios - ASPIRE\n");
1698
1699 cflag = tty->termios.c_cflag;
1700
1701 dev_dbg(&port->dev, "%s - cflag %08x iflag %08x\n", __func__,
1702 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
1703
1704 dev_dbg(&port->dev, "%s - old cflag %08x old iflag %08x\n", __func__,
1705 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
1706
1707 /* change the port settings to the new ones specified */
1708 change_port_settings(tty, mos7720_port, old_termios);
1709
1710 if (port->read_urb->status != -EINPROGRESS) {
1711 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1712 if (status)
1713 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status);
1714 }
1715 }
1716
1717 /*
1718 * get_lsr_info - get line status register info
1719 *
1720 * Purpose: Let user call ioctl() to get info when the UART physically
1721 * is emptied. On bus types like RS485, the transmitter must
1722 * release the bus after transmitting. This must be done when
1723 * the transmit shift register is empty, not be done when the
1724 * transmit holding register is empty. This functionality
1725 * allows an RS485 driver to be written in user space.
1726 */
1727 static int get_lsr_info(struct tty_struct *tty,
1728 struct moschip_port *mos7720_port, unsigned int __user *value)
1729 {
1730 struct usb_serial_port *port = tty->driver_data;
1731 unsigned int result = 0;
1732 unsigned char data = 0;
1733 int port_number = port->port_number;
1734 int count;
1735
1736 count = mos7720_chars_in_buffer(tty);
1737 if (count == 0) {
1738 read_mos_reg(port->serial, port_number, LSR, &data);
1739 if ((data & (UART_LSR_TEMT | UART_LSR_THRE))
1740 == (UART_LSR_TEMT | UART_LSR_THRE)) {
1741 dev_dbg(&port->dev, "%s -- Empty\n", __func__);
1742 result = TIOCSER_TEMT;
1743 }
1744 }
1745 if (copy_to_user(value, &result, sizeof(int)))
1746 return -EFAULT;
1747 return 0;
1748 }
1749
1750 static int mos7720_tiocmget(struct tty_struct *tty)
1751 {
1752 struct usb_serial_port *port = tty->driver_data;
1753 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1754 unsigned int result = 0;
1755 unsigned int mcr ;
1756 unsigned int msr ;
1757
1758 mcr = mos7720_port->shadowMCR;
1759 msr = mos7720_port->shadowMSR;
1760
1761 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */
1762 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */
1763 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */
1764 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */
1765 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */
1766 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
1767
1768 return result;
1769 }
1770
1771 static int mos7720_tiocmset(struct tty_struct *tty,
1772 unsigned int set, unsigned int clear)
1773 {
1774 struct usb_serial_port *port = tty->driver_data;
1775 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1776 unsigned int mcr ;
1777
1778 mcr = mos7720_port->shadowMCR;
1779
1780 if (set & TIOCM_RTS)
1781 mcr |= UART_MCR_RTS;
1782 if (set & TIOCM_DTR)
1783 mcr |= UART_MCR_DTR;
1784 if (set & TIOCM_LOOP)
1785 mcr |= UART_MCR_LOOP;
1786
1787 if (clear & TIOCM_RTS)
1788 mcr &= ~UART_MCR_RTS;
1789 if (clear & TIOCM_DTR)
1790 mcr &= ~UART_MCR_DTR;
1791 if (clear & TIOCM_LOOP)
1792 mcr &= ~UART_MCR_LOOP;
1793
1794 mos7720_port->shadowMCR = mcr;
1795 write_mos_reg(port->serial, port->port_number, MCR,
1796 mos7720_port->shadowMCR);
1797
1798 return 0;
1799 }
1800
1801 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd,
1802 unsigned int __user *value)
1803 {
1804 unsigned int mcr;
1805 unsigned int arg;
1806
1807 struct usb_serial_port *port;
1808
1809 if (mos7720_port == NULL)
1810 return -1;
1811
1812 port = (struct usb_serial_port *)mos7720_port->port;
1813 mcr = mos7720_port->shadowMCR;
1814
1815 if (copy_from_user(&arg, value, sizeof(int)))
1816 return -EFAULT;
1817
1818 switch (cmd) {
1819 case TIOCMBIS:
1820 if (arg & TIOCM_RTS)
1821 mcr |= UART_MCR_RTS;
1822 if (arg & TIOCM_DTR)
1823 mcr |= UART_MCR_RTS;
1824 if (arg & TIOCM_LOOP)
1825 mcr |= UART_MCR_LOOP;
1826 break;
1827
1828 case TIOCMBIC:
1829 if (arg & TIOCM_RTS)
1830 mcr &= ~UART_MCR_RTS;
1831 if (arg & TIOCM_DTR)
1832 mcr &= ~UART_MCR_RTS;
1833 if (arg & TIOCM_LOOP)
1834 mcr &= ~UART_MCR_LOOP;
1835 break;
1836
1837 }
1838
1839 mos7720_port->shadowMCR = mcr;
1840 write_mos_reg(port->serial, port->port_number, MCR,
1841 mos7720_port->shadowMCR);
1842
1843 return 0;
1844 }
1845
1846 static int get_serial_info(struct moschip_port *mos7720_port,
1847 struct serial_struct __user *retinfo)
1848 {
1849 struct serial_struct tmp;
1850
1851 if (!retinfo)
1852 return -EFAULT;
1853
1854 memset(&tmp, 0, sizeof(tmp));
1855
1856 tmp.type = PORT_16550A;
1857 tmp.line = mos7720_port->port->minor;
1858 tmp.port = mos7720_port->port->port_number;
1859 tmp.irq = 0;
1860 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
1861 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1862 tmp.baud_base = 9600;
1863 tmp.close_delay = 5*HZ;
1864 tmp.closing_wait = 30*HZ;
1865
1866 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1867 return -EFAULT;
1868 return 0;
1869 }
1870
1871 static int mos7720_ioctl(struct tty_struct *tty,
1872 unsigned int cmd, unsigned long arg)
1873 {
1874 struct usb_serial_port *port = tty->driver_data;
1875 struct moschip_port *mos7720_port;
1876
1877 mos7720_port = usb_get_serial_port_data(port);
1878 if (mos7720_port == NULL)
1879 return -ENODEV;
1880
1881 dev_dbg(&port->dev, "%s - cmd = 0x%x", __func__, cmd);
1882
1883 switch (cmd) {
1884 case TIOCSERGETLSR:
1885 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
1886 return get_lsr_info(tty, mos7720_port,
1887 (unsigned int __user *)arg);
1888
1889 /* FIXME: These should be using the mode methods */
1890 case TIOCMBIS:
1891 case TIOCMBIC:
1892 dev_dbg(&port->dev, "%s TIOCMSET/TIOCMBIC/TIOCMSET\n", __func__);
1893 return set_modem_info(mos7720_port, cmd,
1894 (unsigned int __user *)arg);
1895
1896 case TIOCGSERIAL:
1897 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
1898 return get_serial_info(mos7720_port,
1899 (struct serial_struct __user *)arg);
1900 }
1901
1902 return -ENOIOCTLCMD;
1903 }
1904
1905 static int mos7720_startup(struct usb_serial *serial)
1906 {
1907 struct usb_device *dev;
1908 char data;
1909 u16 product;
1910 int ret_val;
1911
1912 product = le16_to_cpu(serial->dev->descriptor.idProduct);
1913 dev = serial->dev;
1914
1915 /*
1916 * The 7715 uses the first bulk in/out endpoint pair for the parallel
1917 * port, and the second for the serial port. Because the usbserial core
1918 * assumes both pairs are serial ports, we must engage in a bit of
1919 * subterfuge and swap the pointers for ports 0 and 1 in order to make
1920 * port 0 point to the serial port. However, both moschip devices use a
1921 * single interrupt-in endpoint for both ports (as mentioned a little
1922 * further down), and this endpoint was assigned to port 0. So after
1923 * the swap, we must copy the interrupt endpoint elements from port 1
1924 * (as newly assigned) to port 0, and null out port 1 pointers.
1925 */
1926 if (product == MOSCHIP_DEVICE_ID_7715) {
1927 struct usb_serial_port *tmp = serial->port[0];
1928 serial->port[0] = serial->port[1];
1929 serial->port[1] = tmp;
1930 serial->port[0]->interrupt_in_urb = tmp->interrupt_in_urb;
1931 serial->port[0]->interrupt_in_buffer = tmp->interrupt_in_buffer;
1932 serial->port[0]->interrupt_in_endpointAddress =
1933 tmp->interrupt_in_endpointAddress;
1934 serial->port[1]->interrupt_in_urb = NULL;
1935 serial->port[1]->interrupt_in_buffer = NULL;
1936 }
1937
1938 /* setting configuration feature to one */
1939 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1940 (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5000);
1941
1942 /* start the interrupt urb */
1943 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL);
1944 if (ret_val)
1945 dev_err(&dev->dev,
1946 "%s - Error %d submitting control urb\n",
1947 __func__, ret_val);
1948
1949 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
1950 if (product == MOSCHIP_DEVICE_ID_7715) {
1951 ret_val = mos7715_parport_init(serial);
1952 if (ret_val < 0)
1953 return ret_val;
1954 }
1955 #endif
1956 /* LSR For Port 1 */
1957 read_mos_reg(serial, 0, LSR, &data);
1958 dev_dbg(&dev->dev, "LSR:%x\n", data);
1959
1960 return 0;
1961 }
1962
1963 static void mos7720_release(struct usb_serial *serial)
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
2000 kref_put(&mos_parport->ref_count, destroy_mos_parport);
2001 }
2002 #endif
2003 }
2004
2005 static int mos7720_port_probe(struct usb_serial_port *port)
2006 {
2007 struct moschip_port *mos7720_port;
2008
2009 mos7720_port = kzalloc(sizeof(*mos7720_port), GFP_KERNEL);
2010 if (!mos7720_port)
2011 return -ENOMEM;
2012
2013 /* Initialize all port interrupt end point to port 0 int endpoint.
2014 * Our device has only one interrupt endpoint common to all ports.
2015 */
2016 port->interrupt_in_endpointAddress =
2017 port->serial->port[0]->interrupt_in_endpointAddress;
2018 mos7720_port->port = port;
2019
2020 usb_set_serial_port_data(port, mos7720_port);
2021
2022 return 0;
2023 }
2024
2025 static int mos7720_port_remove(struct usb_serial_port *port)
2026 {
2027 struct moschip_port *mos7720_port;
2028
2029 mos7720_port = usb_get_serial_port_data(port);
2030 kfree(mos7720_port);
2031
2032 return 0;
2033 }
2034
2035 static struct usb_serial_driver moschip7720_2port_driver = {
2036 .driver = {
2037 .owner = THIS_MODULE,
2038 .name = "moschip7720",
2039 },
2040 .description = "Moschip 2 port adapter",
2041 .id_table = id_table,
2042 .calc_num_ports = mos77xx_calc_num_ports,
2043 .open = mos7720_open,
2044 .close = mos7720_close,
2045 .throttle = mos7720_throttle,
2046 .unthrottle = mos7720_unthrottle,
2047 .probe = mos77xx_probe,
2048 .attach = mos7720_startup,
2049 .release = mos7720_release,
2050 .port_probe = mos7720_port_probe,
2051 .port_remove = mos7720_port_remove,
2052 .ioctl = mos7720_ioctl,
2053 .tiocmget = mos7720_tiocmget,
2054 .tiocmset = mos7720_tiocmset,
2055 .set_termios = mos7720_set_termios,
2056 .write = mos7720_write,
2057 .write_room = mos7720_write_room,
2058 .chars_in_buffer = mos7720_chars_in_buffer,
2059 .break_ctl = mos7720_break,
2060 .read_bulk_callback = mos7720_bulk_in_callback,
2061 .read_int_callback = NULL /* dynamically assigned in probe() */
2062 };
2063
2064 static struct usb_serial_driver * const serial_drivers[] = {
2065 &moschip7720_2port_driver, NULL
2066 };
2067
2068 module_usb_serial_driver(serial_drivers, id_table);
2069
2070 MODULE_AUTHOR(DRIVER_AUTHOR);
2071 MODULE_DESCRIPTION(DRIVER_DESC);
2072 MODULE_LICENSE("GPL");
Linux with added FPC-III support