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Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
[deliverable/linux.git] / drivers / usb / serial / mos7720.c
1 /*
2 * mos7720.c
3 * Controls the Moschip 7720 usb to dual port serial converter
4 *
5 * Copyright 2006 Moschip Semiconductor Tech. Ltd.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, version 2 of the License.
10 *
11 * Developed by:
12 * Vijaya Kumar <vijaykumar.gn@gmail.com>
13 * Ajay Kumar <naanuajay@yahoo.com>
14 * Gurudeva <ngurudeva@yahoo.com>
15 *
16 * Cleaned up from the original by:
17 * Greg Kroah-Hartman <gregkh@suse.de>
18 *
19 * Originally based on drivers/usb/serial/io_edgeport.c which is:
20 * Copyright (C) 2000 Inside Out Networks, All rights reserved.
21 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
22 */
23 #include <linux/kernel.h>
24 #include <linux/errno.h>
25 #include <linux/slab.h>
26 #include <linux/tty.h>
27 #include <linux/tty_driver.h>
28 #include <linux/tty_flip.h>
29 #include <linux/module.h>
30 #include <linux/spinlock.h>
31 #include <linux/serial.h>
32 #include <linux/serial_reg.h>
33 #include <linux/usb.h>
34 #include <linux/usb/serial.h>
35 #include <linux/uaccess.h>
36 #include <linux/parport.h>
37
38 #define DRIVER_AUTHOR "Aspire Communications pvt Ltd."
39 #define DRIVER_DESC "Moschip USB Serial Driver"
40
41 /* default urb timeout */
42 #define MOS_WDR_TIMEOUT 5000
43
44 #define MOS_MAX_PORT 0x02
45 #define MOS_WRITE 0x0E
46 #define MOS_READ 0x0D
47
48 /* Interrupt Routines Defines */
49 #define SERIAL_IIR_RLS 0x06
50 #define SERIAL_IIR_RDA 0x04
51 #define SERIAL_IIR_CTI 0x0c
52 #define SERIAL_IIR_THR 0x02
53 #define SERIAL_IIR_MS 0x00
54
55 #define NUM_URBS 16 /* URB Count */
56 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
57
58 /* This structure holds all of the local serial port information */
59 struct moschip_port {
60 __u8 shadowLCR; /* last LCR value received */
61 __u8 shadowMCR; /* last MCR value received */
62 __u8 shadowMSR; /* last MSR value received */
63 char open;
64 struct usb_serial_port *port; /* loop back to the owner */
65 struct urb *write_urb_pool[NUM_URBS];
66 };
67
68 static struct usb_serial_driver moschip7720_2port_driver;
69
70 #define USB_VENDOR_ID_MOSCHIP 0x9710
71 #define MOSCHIP_DEVICE_ID_7720 0x7720
72 #define MOSCHIP_DEVICE_ID_7715 0x7715
73
74 static const struct usb_device_id id_table[] = {
75 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7720) },
76 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7715) },
77 { } /* terminating entry */
78 };
79 MODULE_DEVICE_TABLE(usb, id_table);
80
81 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
82
83 /* initial values for parport regs */
84 #define DCR_INIT_VAL 0x0c /* SLCTIN, nINIT */
85 #define ECR_INIT_VAL 0x00 /* SPP mode */
86
87 struct urbtracker {
88 struct mos7715_parport *mos_parport;
89 struct list_head urblist_entry;
90 struct kref ref_count;
91 struct urb *urb;
92 struct usb_ctrlrequest *setup;
93 };
94
95 enum mos7715_pp_modes {
96 SPP = 0<<5,
97 PS2 = 1<<5, /* moschip calls this 'NIBBLE' mode */
98 PPF = 2<<5, /* moschip calls this 'CB-FIFO mode */
99 };
100
101 struct mos7715_parport {
102 struct parport *pp; /* back to containing struct */
103 struct kref ref_count; /* to instance of this struct */
104 struct list_head deferred_urbs; /* list deferred async urbs */
105 struct list_head active_urbs; /* list async urbs in flight */
106 spinlock_t listlock; /* protects list access */
107 bool msg_pending; /* usb sync call pending */
108 struct completion syncmsg_compl; /* usb sync call completed */
109 struct tasklet_struct urb_tasklet; /* for sending deferred urbs */
110 struct usb_serial *serial; /* back to containing struct */
111 __u8 shadowECR; /* parallel port regs... */
112 __u8 shadowDCR;
113 atomic_t shadowDSR; /* updated in int-in callback */
114 };
115
116 /* lock guards against dereferencing NULL ptr in parport ops callbacks */
117 static DEFINE_SPINLOCK(release_lock);
118
119 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
120
121 static const unsigned int dummy; /* for clarity in register access fns */
122
123 enum mos_regs {
124 THR, /* serial port regs */
125 RHR,
126 IER,
127 FCR,
128 ISR,
129 LCR,
130 MCR,
131 LSR,
132 MSR,
133 SPR,
134 DLL,
135 DLM,
136 DPR, /* parallel port regs */
137 DSR,
138 DCR,
139 ECR,
140 SP1_REG, /* device control regs */
141 SP2_REG, /* serial port 2 (7720 only) */
142 PP_REG,
143 SP_CONTROL_REG,
144 };
145
146 /*
147 * Return the correct value for the Windex field of the setup packet
148 * for a control endpoint message. See the 7715 datasheet.
149 */
150 static inline __u16 get_reg_index(enum mos_regs reg)
151 {
152 static const __u16 mos7715_index_lookup_table[] = {
153 0x00, /* THR */
154 0x00, /* RHR */
155 0x01, /* IER */
156 0x02, /* FCR */
157 0x02, /* ISR */
158 0x03, /* LCR */
159 0x04, /* MCR */
160 0x05, /* LSR */
161 0x06, /* MSR */
162 0x07, /* SPR */
163 0x00, /* DLL */
164 0x01, /* DLM */
165 0x00, /* DPR */
166 0x01, /* DSR */
167 0x02, /* DCR */
168 0x0a, /* ECR */
169 0x01, /* SP1_REG */
170 0x02, /* SP2_REG (7720 only) */
171 0x04, /* PP_REG (7715 only) */
172 0x08, /* SP_CONTROL_REG */
173 };
174 return mos7715_index_lookup_table[reg];
175 }
176
177 /*
178 * Return the correct value for the upper byte of the Wvalue field of
179 * the setup packet for a control endpoint message.
180 */
181 static inline __u16 get_reg_value(enum mos_regs reg,
182 unsigned int serial_portnum)
183 {
184 if (reg >= SP1_REG) /* control reg */
185 return 0x0000;
186
187 else if (reg >= DPR) /* parallel port reg (7715 only) */
188 return 0x0100;
189
190 else /* serial port reg */
191 return (serial_portnum + 2) << 8;
192 }
193
194 /*
195 * Write data byte to the specified device register. The data is embedded in
196 * the value field of the setup packet. serial_portnum is ignored for registers
197 * not specific to a particular serial port.
198 */
199 static int write_mos_reg(struct usb_serial *serial, unsigned int serial_portnum,
200 enum mos_regs reg, __u8 data)
201 {
202 struct usb_device *usbdev = serial->dev;
203 unsigned int pipe = usb_sndctrlpipe(usbdev, 0);
204 __u8 request = (__u8)0x0e;
205 __u8 requesttype = (__u8)0x40;
206 __u16 index = get_reg_index(reg);
207 __u16 value = get_reg_value(reg, serial_portnum) + data;
208 int status = usb_control_msg(usbdev, pipe, request, requesttype, value,
209 index, NULL, 0, MOS_WDR_TIMEOUT);
210 if (status < 0)
211 dev_err(&usbdev->dev,
212 "mos7720: usb_control_msg() failed: %d\n", status);
213 return status;
214 }
215
216 /*
217 * Read data byte from the specified device register. The data returned by the
218 * device is embedded in the value field of the setup packet. serial_portnum is
219 * ignored for registers that are not specific to a particular serial port.
220 */
221 static int read_mos_reg(struct usb_serial *serial, unsigned int serial_portnum,
222 enum mos_regs reg, __u8 *data)
223 {
224 struct usb_device *usbdev = serial->dev;
225 unsigned int pipe = usb_rcvctrlpipe(usbdev, 0);
226 __u8 request = (__u8)0x0d;
227 __u8 requesttype = (__u8)0xc0;
228 __u16 index = get_reg_index(reg);
229 __u16 value = get_reg_value(reg, serial_portnum);
230 u8 *buf;
231 int status;
232
233 buf = kmalloc(1, GFP_KERNEL);
234 if (!buf)
235 return -ENOMEM;
236
237 status = usb_control_msg(usbdev, pipe, request, requesttype, value,
238 index, buf, 1, MOS_WDR_TIMEOUT);
239 if (status == 1)
240 *data = *buf;
241 else if (status < 0)
242 dev_err(&usbdev->dev,
243 "mos7720: usb_control_msg() failed: %d\n", status);
244 kfree(buf);
245
246 return status;
247 }
248
249 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
250
251 static inline int mos7715_change_mode(struct mos7715_parport *mos_parport,
252 enum mos7715_pp_modes mode)
253 {
254 mos_parport->shadowECR = mode;
255 write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR);
256 return 0;
257 }
258
259 static void destroy_mos_parport(struct kref *kref)
260 {
261 struct mos7715_parport *mos_parport =
262 container_of(kref, struct mos7715_parport, ref_count);
263
264 kfree(mos_parport);
265 }
266
267 static void destroy_urbtracker(struct kref *kref)
268 {
269 struct urbtracker *urbtrack =
270 container_of(kref, struct urbtracker, ref_count);
271 struct mos7715_parport *mos_parport = urbtrack->mos_parport;
272
273 usb_free_urb(urbtrack->urb);
274 kfree(urbtrack->setup);
275 kfree(urbtrack);
276 kref_put(&mos_parport->ref_count, destroy_mos_parport);
277 }
278
279 /*
280 * This runs as a tasklet when sending an urb in a non-blocking parallel
281 * port callback had to be deferred because the disconnect mutex could not be
282 * obtained at the time.
283 */
284 static void send_deferred_urbs(unsigned long _mos_parport)
285 {
286 int ret_val;
287 unsigned long flags;
288 struct mos7715_parport *mos_parport = (void *)_mos_parport;
289 struct urbtracker *urbtrack, *tmp;
290 struct list_head *cursor, *next;
291 struct device *dev;
292
293 /* if release function ran, game over */
294 if (unlikely(mos_parport->serial == NULL))
295 return;
296
297 dev = &mos_parport->serial->dev->dev;
298
299 /* try again to get the mutex */
300 if (!mutex_trylock(&mos_parport->serial->disc_mutex)) {
301 dev_dbg(dev, "%s: rescheduling tasklet\n", __func__);
302 tasklet_schedule(&mos_parport->urb_tasklet);
303 return;
304 }
305
306 /* if device disconnected, game over */
307 if (unlikely(mos_parport->serial->disconnected)) {
308 mutex_unlock(&mos_parport->serial->disc_mutex);
309 return;
310 }
311
312 spin_lock_irqsave(&mos_parport->listlock, flags);
313 if (list_empty(&mos_parport->deferred_urbs)) {
314 spin_unlock_irqrestore(&mos_parport->listlock, flags);
315 mutex_unlock(&mos_parport->serial->disc_mutex);
316 dev_dbg(dev, "%s: deferred_urbs list empty\n", __func__);
317 return;
318 }
319
320 /* move contents of deferred_urbs list to active_urbs list and submit */
321 list_for_each_safe(cursor, next, &mos_parport->deferred_urbs)
322 list_move_tail(cursor, &mos_parport->active_urbs);
323 list_for_each_entry_safe(urbtrack, tmp, &mos_parport->active_urbs,
324 urblist_entry) {
325 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
326 dev_dbg(dev, "%s: urb submitted\n", __func__);
327 if (ret_val) {
328 dev_err(dev, "usb_submit_urb() failed: %d\n", ret_val);
329 list_del(&urbtrack->urblist_entry);
330 kref_put(&urbtrack->ref_count, destroy_urbtracker);
331 }
332 }
333 spin_unlock_irqrestore(&mos_parport->listlock, flags);
334 mutex_unlock(&mos_parport->serial->disc_mutex);
335 }
336
337 /* callback for parallel port control urbs submitted asynchronously */
338 static void async_complete(struct urb *urb)
339 {
340 struct urbtracker *urbtrack = urb->context;
341 int status = urb->status;
342
343 if (unlikely(status))
344 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n", __func__, status);
345
346 /* remove the urbtracker from the active_urbs list */
347 spin_lock(&urbtrack->mos_parport->listlock);
348 list_del(&urbtrack->urblist_entry);
349 spin_unlock(&urbtrack->mos_parport->listlock);
350 kref_put(&urbtrack->ref_count, destroy_urbtracker);
351 }
352
353 static int write_parport_reg_nonblock(struct mos7715_parport *mos_parport,
354 enum mos_regs reg, __u8 data)
355 {
356 struct urbtracker *urbtrack;
357 int ret_val;
358 unsigned long flags;
359 struct usb_serial *serial = mos_parport->serial;
360 struct usb_device *usbdev = serial->dev;
361
362 /* create and initialize the control urb and containing urbtracker */
363 urbtrack = kmalloc(sizeof(struct urbtracker), GFP_ATOMIC);
364 if (!urbtrack)
365 return -ENOMEM;
366
367 kref_get(&mos_parport->ref_count);
368 urbtrack->mos_parport = mos_parport;
369 urbtrack->urb = usb_alloc_urb(0, GFP_ATOMIC);
370 if (!urbtrack->urb) {
371 kfree(urbtrack);
372 return -ENOMEM;
373 }
374 urbtrack->setup = kmalloc(sizeof(*urbtrack->setup), GFP_ATOMIC);
375 if (!urbtrack->setup) {
376 usb_free_urb(urbtrack->urb);
377 kfree(urbtrack);
378 return -ENOMEM;
379 }
380 urbtrack->setup->bRequestType = (__u8)0x40;
381 urbtrack->setup->bRequest = (__u8)0x0e;
382 urbtrack->setup->wValue = cpu_to_le16(get_reg_value(reg, dummy));
383 urbtrack->setup->wIndex = cpu_to_le16(get_reg_index(reg));
384 urbtrack->setup->wLength = 0;
385 usb_fill_control_urb(urbtrack->urb, usbdev,
386 usb_sndctrlpipe(usbdev, 0),
387 (unsigned char *)urbtrack->setup,
388 NULL, 0, async_complete, urbtrack);
389 kref_init(&urbtrack->ref_count);
390 INIT_LIST_HEAD(&urbtrack->urblist_entry);
391
392 /*
393 * get the disconnect mutex, or add tracker to the deferred_urbs list
394 * and schedule a tasklet to try again later
395 */
396 if (!mutex_trylock(&serial->disc_mutex)) {
397 spin_lock_irqsave(&mos_parport->listlock, flags);
398 list_add_tail(&urbtrack->urblist_entry,
399 &mos_parport->deferred_urbs);
400 spin_unlock_irqrestore(&mos_parport->listlock, flags);
401 tasklet_schedule(&mos_parport->urb_tasklet);
402 dev_dbg(&usbdev->dev, "tasklet scheduled\n");
403 return 0;
404 }
405
406 /* bail if device disconnected */
407 if (serial->disconnected) {
408 kref_put(&urbtrack->ref_count, destroy_urbtracker);
409 mutex_unlock(&serial->disc_mutex);
410 return -ENODEV;
411 }
412
413 /* add the tracker to the active_urbs list and submit */
414 spin_lock_irqsave(&mos_parport->listlock, flags);
415 list_add_tail(&urbtrack->urblist_entry, &mos_parport->active_urbs);
416 spin_unlock_irqrestore(&mos_parport->listlock, flags);
417 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
418 mutex_unlock(&serial->disc_mutex);
419 if (ret_val) {
420 dev_err(&usbdev->dev,
421 "%s: submit_urb() failed: %d\n", __func__, ret_val);
422 spin_lock_irqsave(&mos_parport->listlock, flags);
423 list_del(&urbtrack->urblist_entry);
424 spin_unlock_irqrestore(&mos_parport->listlock, flags);
425 kref_put(&urbtrack->ref_count, destroy_urbtracker);
426 return ret_val;
427 }
428 return 0;
429 }
430
431 /*
432 * This is the the common top part of all parallel port callback operations that
433 * send synchronous messages to the device. This implements convoluted locking
434 * that avoids two scenarios: (1) a port operation is called after usbserial
435 * has called our release function, at which point struct mos7715_parport has
436 * been destroyed, and (2) the device has been disconnected, but usbserial has
437 * not called the release function yet because someone has a serial port open.
438 * The shared release_lock prevents the first, and the mutex and disconnected
439 * flag maintained by usbserial covers the second. We also use the msg_pending
440 * flag to ensure that all synchronous usb message calls have completed before
441 * our release function can return.
442 */
443 static int parport_prologue(struct parport *pp)
444 {
445 struct mos7715_parport *mos_parport;
446
447 spin_lock(&release_lock);
448 mos_parport = pp->private_data;
449 if (unlikely(mos_parport == NULL)) {
450 /* release fn called, port struct destroyed */
451 spin_unlock(&release_lock);
452 return -1;
453 }
454 mos_parport->msg_pending = true; /* synch usb call pending */
455 reinit_completion(&mos_parport->syncmsg_compl);
456 spin_unlock(&release_lock);
457
458 mutex_lock(&mos_parport->serial->disc_mutex);
459 if (mos_parport->serial->disconnected) {
460 /* device disconnected */
461 mutex_unlock(&mos_parport->serial->disc_mutex);
462 mos_parport->msg_pending = false;
463 complete(&mos_parport->syncmsg_compl);
464 return -1;
465 }
466
467 return 0;
468 }
469
470 /*
471 * This is the common bottom part of all parallel port functions that send
472 * synchronous messages to the device.
473 */
474 static inline void parport_epilogue(struct parport *pp)
475 {
476 struct mos7715_parport *mos_parport = pp->private_data;
477 mutex_unlock(&mos_parport->serial->disc_mutex);
478 mos_parport->msg_pending = false;
479 complete(&mos_parport->syncmsg_compl);
480 }
481
482 static void parport_mos7715_write_data(struct parport *pp, unsigned char d)
483 {
484 struct mos7715_parport *mos_parport = pp->private_data;
485
486 if (parport_prologue(pp) < 0)
487 return;
488 mos7715_change_mode(mos_parport, SPP);
489 write_mos_reg(mos_parport->serial, dummy, DPR, (__u8)d);
490 parport_epilogue(pp);
491 }
492
493 static unsigned char parport_mos7715_read_data(struct parport *pp)
494 {
495 struct mos7715_parport *mos_parport = pp->private_data;
496 unsigned char d;
497
498 if (parport_prologue(pp) < 0)
499 return 0;
500 read_mos_reg(mos_parport->serial, dummy, DPR, &d);
501 parport_epilogue(pp);
502 return d;
503 }
504
505 static void parport_mos7715_write_control(struct parport *pp, unsigned char d)
506 {
507 struct mos7715_parport *mos_parport = pp->private_data;
508 __u8 data;
509
510 if (parport_prologue(pp) < 0)
511 return;
512 data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0);
513 write_mos_reg(mos_parport->serial, dummy, DCR, data);
514 mos_parport->shadowDCR = data;
515 parport_epilogue(pp);
516 }
517
518 static unsigned char parport_mos7715_read_control(struct parport *pp)
519 {
520 struct mos7715_parport *mos_parport = pp->private_data;
521 __u8 dcr;
522
523 spin_lock(&release_lock);
524 mos_parport = pp->private_data;
525 if (unlikely(mos_parport == NULL)) {
526 spin_unlock(&release_lock);
527 return 0;
528 }
529 dcr = mos_parport->shadowDCR & 0x0f;
530 spin_unlock(&release_lock);
531 return dcr;
532 }
533
534 static unsigned char parport_mos7715_frob_control(struct parport *pp,
535 unsigned char mask,
536 unsigned char val)
537 {
538 struct mos7715_parport *mos_parport = pp->private_data;
539 __u8 dcr;
540
541 mask &= 0x0f;
542 val &= 0x0f;
543 if (parport_prologue(pp) < 0)
544 return 0;
545 mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val;
546 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
547 dcr = mos_parport->shadowDCR & 0x0f;
548 parport_epilogue(pp);
549 return dcr;
550 }
551
552 static unsigned char parport_mos7715_read_status(struct parport *pp)
553 {
554 unsigned char status;
555 struct mos7715_parport *mos_parport = pp->private_data;
556
557 spin_lock(&release_lock);
558 mos_parport = pp->private_data;
559 if (unlikely(mos_parport == NULL)) { /* release called */
560 spin_unlock(&release_lock);
561 return 0;
562 }
563 status = atomic_read(&mos_parport->shadowDSR) & 0xf8;
564 spin_unlock(&release_lock);
565 return status;
566 }
567
568 static void parport_mos7715_enable_irq(struct parport *pp)
569 {
570 }
571
572 static void parport_mos7715_disable_irq(struct parport *pp)
573 {
574 }
575
576 static void parport_mos7715_data_forward(struct parport *pp)
577 {
578 struct mos7715_parport *mos_parport = pp->private_data;
579
580 if (parport_prologue(pp) < 0)
581 return;
582 mos7715_change_mode(mos_parport, PS2);
583 mos_parport->shadowDCR &= ~0x20;
584 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
585 parport_epilogue(pp);
586 }
587
588 static void parport_mos7715_data_reverse(struct parport *pp)
589 {
590 struct mos7715_parport *mos_parport = pp->private_data;
591
592 if (parport_prologue(pp) < 0)
593 return;
594 mos7715_change_mode(mos_parport, PS2);
595 mos_parport->shadowDCR |= 0x20;
596 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
597 parport_epilogue(pp);
598 }
599
600 static void parport_mos7715_init_state(struct pardevice *dev,
601 struct parport_state *s)
602 {
603 s->u.pc.ctr = DCR_INIT_VAL;
604 s->u.pc.ecr = ECR_INIT_VAL;
605 }
606
607 /* N.B. Parport core code requires that this function not block */
608 static void parport_mos7715_save_state(struct parport *pp,
609 struct parport_state *s)
610 {
611 struct mos7715_parport *mos_parport;
612
613 spin_lock(&release_lock);
614 mos_parport = pp->private_data;
615 if (unlikely(mos_parport == NULL)) { /* release called */
616 spin_unlock(&release_lock);
617 return;
618 }
619 s->u.pc.ctr = mos_parport->shadowDCR;
620 s->u.pc.ecr = mos_parport->shadowECR;
621 spin_unlock(&release_lock);
622 }
623
624 /* N.B. Parport core code requires that this function not block */
625 static void parport_mos7715_restore_state(struct parport *pp,
626 struct parport_state *s)
627 {
628 struct mos7715_parport *mos_parport;
629
630 spin_lock(&release_lock);
631 mos_parport = pp->private_data;
632 if (unlikely(mos_parport == NULL)) { /* release called */
633 spin_unlock(&release_lock);
634 return;
635 }
636 write_parport_reg_nonblock(mos_parport, DCR, mos_parport->shadowDCR);
637 write_parport_reg_nonblock(mos_parport, ECR, mos_parport->shadowECR);
638 spin_unlock(&release_lock);
639 }
640
641 static size_t parport_mos7715_write_compat(struct parport *pp,
642 const void *buffer,
643 size_t len, int flags)
644 {
645 int retval;
646 struct mos7715_parport *mos_parport = pp->private_data;
647 int actual_len;
648
649 if (parport_prologue(pp) < 0)
650 return 0;
651 mos7715_change_mode(mos_parport, PPF);
652 retval = usb_bulk_msg(mos_parport->serial->dev,
653 usb_sndbulkpipe(mos_parport->serial->dev, 2),
654 (void *)buffer, len, &actual_len,
655 MOS_WDR_TIMEOUT);
656 parport_epilogue(pp);
657 if (retval) {
658 dev_err(&mos_parport->serial->dev->dev,
659 "mos7720: usb_bulk_msg() failed: %d\n", retval);
660 return 0;
661 }
662 return actual_len;
663 }
664
665 static struct parport_operations parport_mos7715_ops = {
666 .owner = THIS_MODULE,
667 .write_data = parport_mos7715_write_data,
668 .read_data = parport_mos7715_read_data,
669
670 .write_control = parport_mos7715_write_control,
671 .read_control = parport_mos7715_read_control,
672 .frob_control = parport_mos7715_frob_control,
673
674 .read_status = parport_mos7715_read_status,
675
676 .enable_irq = parport_mos7715_enable_irq,
677 .disable_irq = parport_mos7715_disable_irq,
678
679 .data_forward = parport_mos7715_data_forward,
680 .data_reverse = parport_mos7715_data_reverse,
681
682 .init_state = parport_mos7715_init_state,
683 .save_state = parport_mos7715_save_state,
684 .restore_state = parport_mos7715_restore_state,
685
686 .compat_write_data = parport_mos7715_write_compat,
687
688 .nibble_read_data = parport_ieee1284_read_nibble,
689 .byte_read_data = parport_ieee1284_read_byte,
690 };
691
692 /*
693 * Allocate and initialize parallel port control struct, initialize
694 * the parallel port hardware device, and register with the parport subsystem.
695 */
696 static int mos7715_parport_init(struct usb_serial *serial)
697 {
698 struct mos7715_parport *mos_parport;
699
700 /* allocate and initialize parallel port control struct */
701 mos_parport = kzalloc(sizeof(struct mos7715_parport), GFP_KERNEL);
702 if (!mos_parport)
703 return -ENOMEM;
704
705 mos_parport->msg_pending = false;
706 kref_init(&mos_parport->ref_count);
707 spin_lock_init(&mos_parport->listlock);
708 INIT_LIST_HEAD(&mos_parport->active_urbs);
709 INIT_LIST_HEAD(&mos_parport->deferred_urbs);
710 usb_set_serial_data(serial, mos_parport); /* hijack private pointer */
711 mos_parport->serial = serial;
712 tasklet_init(&mos_parport->urb_tasklet, send_deferred_urbs,
713 (unsigned long) mos_parport);
714 init_completion(&mos_parport->syncmsg_compl);
715
716 /* cycle parallel port reset bit */
717 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x80);
718 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x00);
719
720 /* initialize device registers */
721 mos_parport->shadowDCR = DCR_INIT_VAL;
722 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
723 mos_parport->shadowECR = ECR_INIT_VAL;
724 write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR);
725
726 /* register with parport core */
727 mos_parport->pp = parport_register_port(0, PARPORT_IRQ_NONE,
728 PARPORT_DMA_NONE,
729 &parport_mos7715_ops);
730 if (mos_parport->pp == NULL) {
731 dev_err(&serial->interface->dev,
732 "Could not register parport\n");
733 kref_put(&mos_parport->ref_count, destroy_mos_parport);
734 return -EIO;
735 }
736 mos_parport->pp->private_data = mos_parport;
737 mos_parport->pp->modes = PARPORT_MODE_COMPAT | PARPORT_MODE_PCSPP;
738 mos_parport->pp->dev = &serial->interface->dev;
739 parport_announce_port(mos_parport->pp);
740
741 return 0;
742 }
743 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
744
745 /*
746 * mos7720_interrupt_callback
747 * this is the callback function for when we have received data on the
748 * interrupt endpoint.
749 */
750 static void mos7720_interrupt_callback(struct urb *urb)
751 {
752 int result;
753 int length;
754 int status = urb->status;
755 struct device *dev = &urb->dev->dev;
756 __u8 *data;
757 __u8 sp1;
758 __u8 sp2;
759
760 switch (status) {
761 case 0:
762 /* success */
763 break;
764 case -ECONNRESET:
765 case -ENOENT:
766 case -ESHUTDOWN:
767 /* this urb is terminated, clean up */
768 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
769 return;
770 default:
771 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
772 goto exit;
773 }
774
775 length = urb->actual_length;
776 data = urb->transfer_buffer;
777
778 /* Moschip get 4 bytes
779 * Byte 1 IIR Port 1 (port.number is 0)
780 * Byte 2 IIR Port 2 (port.number is 1)
781 * Byte 3 --------------
782 * Byte 4 FIFO status for both */
783
784 /* the above description is inverted
785 * oneukum 2007-03-14 */
786
787 if (unlikely(length != 4)) {
788 dev_dbg(dev, "Wrong data !!!\n");
789 return;
790 }
791
792 sp1 = data[3];
793 sp2 = data[2];
794
795 if ((sp1 | sp2) & 0x01) {
796 /* No Interrupt Pending in both the ports */
797 dev_dbg(dev, "No Interrupt !!!\n");
798 } else {
799 switch (sp1 & 0x0f) {
800 case SERIAL_IIR_RLS:
801 dev_dbg(dev, "Serial Port 1: Receiver status error or address bit detected in 9-bit mode\n");
802 break;
803 case SERIAL_IIR_CTI:
804 dev_dbg(dev, "Serial Port 1: Receiver time out\n");
805 break;
806 case SERIAL_IIR_MS:
807 /* dev_dbg(dev, "Serial Port 1: Modem status change\n"); */
808 break;
809 }
810
811 switch (sp2 & 0x0f) {
812 case SERIAL_IIR_RLS:
813 dev_dbg(dev, "Serial Port 2: Receiver status error or address bit detected in 9-bit mode\n");
814 break;
815 case SERIAL_IIR_CTI:
816 dev_dbg(dev, "Serial Port 2: Receiver time out\n");
817 break;
818 case SERIAL_IIR_MS:
819 /* dev_dbg(dev, "Serial Port 2: Modem status change\n"); */
820 break;
821 }
822 }
823
824 exit:
825 result = usb_submit_urb(urb, GFP_ATOMIC);
826 if (result)
827 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result);
828 }
829
830 /*
831 * mos7715_interrupt_callback
832 * this is the 7715's callback function for when we have received data on
833 * the interrupt endpoint.
834 */
835 static void mos7715_interrupt_callback(struct urb *urb)
836 {
837 int result;
838 int length;
839 int status = urb->status;
840 struct device *dev = &urb->dev->dev;
841 __u8 *data;
842 __u8 iir;
843
844 switch (status) {
845 case 0:
846 /* success */
847 break;
848 case -ECONNRESET:
849 case -ENOENT:
850 case -ESHUTDOWN:
851 case -ENODEV:
852 /* this urb is terminated, clean up */
853 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
854 return;
855 default:
856 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
857 goto exit;
858 }
859
860 length = urb->actual_length;
861 data = urb->transfer_buffer;
862
863 /* Structure of data from 7715 device:
864 * Byte 1: IIR serial Port
865 * Byte 2: unused
866 * Byte 2: DSR parallel port
867 * Byte 4: FIFO status for both */
868
869 if (unlikely(length != 4)) {
870 dev_dbg(dev, "Wrong data !!!\n");
871 return;
872 }
873
874 iir = data[0];
875 if (!(iir & 0x01)) { /* serial port interrupt pending */
876 switch (iir & 0x0f) {
877 case SERIAL_IIR_RLS:
878 dev_dbg(dev, "Serial Port: Receiver status error or address bit detected in 9-bit mode\n");
879 break;
880 case SERIAL_IIR_CTI:
881 dev_dbg(dev, "Serial Port: Receiver time out\n");
882 break;
883 case SERIAL_IIR_MS:
884 /* dev_dbg(dev, "Serial Port: Modem status change\n"); */
885 break;
886 }
887 }
888
889 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
890 { /* update local copy of DSR reg */
891 struct usb_serial_port *port = urb->context;
892 struct mos7715_parport *mos_parport = port->serial->private;
893 if (unlikely(mos_parport == NULL))
894 return;
895 atomic_set(&mos_parport->shadowDSR, data[2]);
896 }
897 #endif
898
899 exit:
900 result = usb_submit_urb(urb, GFP_ATOMIC);
901 if (result)
902 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result);
903 }
904
905 /*
906 * mos7720_bulk_in_callback
907 * this is the callback function for when we have received data on the
908 * bulk in endpoint.
909 */
910 static void mos7720_bulk_in_callback(struct urb *urb)
911 {
912 int retval;
913 unsigned char *data ;
914 struct usb_serial_port *port;
915 int status = urb->status;
916
917 if (status) {
918 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
919 return;
920 }
921
922 port = urb->context;
923
924 dev_dbg(&port->dev, "Entering...%s\n", __func__);
925
926 data = urb->transfer_buffer;
927
928 if (urb->actual_length) {
929 tty_insert_flip_string(&port->port, data, urb->actual_length);
930 tty_flip_buffer_push(&port->port);
931 }
932
933 if (port->read_urb->status != -EINPROGRESS) {
934 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
935 if (retval)
936 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
937 }
938 }
939
940 /*
941 * mos7720_bulk_out_data_callback
942 * this is the callback function for when we have finished sending serial
943 * data on the bulk out endpoint.
944 */
945 static void mos7720_bulk_out_data_callback(struct urb *urb)
946 {
947 struct moschip_port *mos7720_port;
948 int status = urb->status;
949
950 if (status) {
951 dev_dbg(&urb->dev->dev, "nonzero write bulk status received:%d\n", status);
952 return;
953 }
954
955 mos7720_port = urb->context;
956 if (!mos7720_port) {
957 dev_dbg(&urb->dev->dev, "NULL mos7720_port pointer\n");
958 return ;
959 }
960
961 if (mos7720_port->open)
962 tty_port_tty_wakeup(&mos7720_port->port->port);
963 }
964
965 /*
966 * mos77xx_probe
967 * this function installs the appropriate read interrupt endpoint callback
968 * depending on whether the device is a 7720 or 7715, thus avoiding costly
969 * run-time checks in the high-frequency callback routine itself.
970 */
971 static int mos77xx_probe(struct usb_serial *serial,
972 const struct usb_device_id *id)
973 {
974 if (id->idProduct == MOSCHIP_DEVICE_ID_7715)
975 moschip7720_2port_driver.read_int_callback =
976 mos7715_interrupt_callback;
977 else
978 moschip7720_2port_driver.read_int_callback =
979 mos7720_interrupt_callback;
980
981 return 0;
982 }
983
984 static int mos77xx_calc_num_ports(struct usb_serial *serial)
985 {
986 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
987 if (product == MOSCHIP_DEVICE_ID_7715)
988 return 1;
989
990 return 2;
991 }
992
993 static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port)
994 {
995 struct usb_serial *serial;
996 struct urb *urb;
997 struct moschip_port *mos7720_port;
998 int response;
999 int port_number;
1000 __u8 data;
1001 int allocated_urbs = 0;
1002 int j;
1003
1004 serial = port->serial;
1005
1006 mos7720_port = usb_get_serial_port_data(port);
1007 if (mos7720_port == NULL)
1008 return -ENODEV;
1009
1010 usb_clear_halt(serial->dev, port->write_urb->pipe);
1011 usb_clear_halt(serial->dev, port->read_urb->pipe);
1012
1013 /* Initialising the write urb pool */
1014 for (j = 0; j < NUM_URBS; ++j) {
1015 urb = usb_alloc_urb(0, GFP_KERNEL);
1016 mos7720_port->write_urb_pool[j] = urb;
1017 if (!urb)
1018 continue;
1019
1020 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1021 GFP_KERNEL);
1022 if (!urb->transfer_buffer) {
1023 usb_free_urb(mos7720_port->write_urb_pool[j]);
1024 mos7720_port->write_urb_pool[j] = NULL;
1025 continue;
1026 }
1027 allocated_urbs++;
1028 }
1029
1030 if (!allocated_urbs)
1031 return -ENOMEM;
1032
1033 /* Initialize MCS7720 -- Write Init values to corresponding Registers
1034 *
1035 * Register Index
1036 * 0 : THR/RHR
1037 * 1 : IER
1038 * 2 : FCR
1039 * 3 : LCR
1040 * 4 : MCR
1041 * 5 : LSR
1042 * 6 : MSR
1043 * 7 : SPR
1044 *
1045 * 0x08 : SP1/2 Control Reg
1046 */
1047 port_number = port->port_number;
1048 read_mos_reg(serial, port_number, LSR, &data);
1049
1050 dev_dbg(&port->dev, "SS::%p LSR:%x\n", mos7720_port, data);
1051
1052 write_mos_reg(serial, dummy, SP1_REG, 0x02);
1053 write_mos_reg(serial, dummy, SP2_REG, 0x02);
1054
1055 write_mos_reg(serial, port_number, IER, 0x00);
1056 write_mos_reg(serial, port_number, FCR, 0x00);
1057
1058 write_mos_reg(serial, port_number, FCR, 0xcf);
1059 mos7720_port->shadowLCR = 0x03;
1060 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1061 mos7720_port->shadowMCR = 0x0b;
1062 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1063
1064 write_mos_reg(serial, port_number, SP_CONTROL_REG, 0x00);
1065 read_mos_reg(serial, dummy, SP_CONTROL_REG, &data);
1066 data = data | (port->port_number + 1);
1067 write_mos_reg(serial, dummy, SP_CONTROL_REG, data);
1068 mos7720_port->shadowLCR = 0x83;
1069 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1070 write_mos_reg(serial, port_number, THR, 0x0c);
1071 write_mos_reg(serial, port_number, IER, 0x00);
1072 mos7720_port->shadowLCR = 0x03;
1073 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1074 write_mos_reg(serial, port_number, IER, 0x0c);
1075
1076 response = usb_submit_urb(port->read_urb, GFP_KERNEL);
1077 if (response)
1078 dev_err(&port->dev, "%s - Error %d submitting read urb\n",
1079 __func__, response);
1080
1081 /* initialize our port settings */
1082 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */
1083
1084 /* send a open port command */
1085 mos7720_port->open = 1;
1086
1087 return 0;
1088 }
1089
1090 /*
1091 * mos7720_chars_in_buffer
1092 * this function is called by the tty driver when it wants to know how many
1093 * bytes of data we currently have outstanding in the port (data that has
1094 * been written, but hasn't made it out the port yet)
1095 * If successful, we return the number of bytes left to be written in the
1096 * system,
1097 * Otherwise we return a negative error number.
1098 */
1099 static int mos7720_chars_in_buffer(struct tty_struct *tty)
1100 {
1101 struct usb_serial_port *port = tty->driver_data;
1102 int i;
1103 int chars = 0;
1104 struct moschip_port *mos7720_port;
1105
1106 mos7720_port = usb_get_serial_port_data(port);
1107 if (mos7720_port == NULL)
1108 return 0;
1109
1110 for (i = 0; i < NUM_URBS; ++i) {
1111 if (mos7720_port->write_urb_pool[i] &&
1112 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS)
1113 chars += URB_TRANSFER_BUFFER_SIZE;
1114 }
1115 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1116 return chars;
1117 }
1118
1119 static void mos7720_close(struct usb_serial_port *port)
1120 {
1121 struct usb_serial *serial;
1122 struct moschip_port *mos7720_port;
1123 int j;
1124
1125 serial = port->serial;
1126
1127 mos7720_port = usb_get_serial_port_data(port);
1128 if (mos7720_port == NULL)
1129 return;
1130
1131 for (j = 0; j < NUM_URBS; ++j)
1132 usb_kill_urb(mos7720_port->write_urb_pool[j]);
1133
1134 /* Freeing Write URBs */
1135 for (j = 0; j < NUM_URBS; ++j) {
1136 if (mos7720_port->write_urb_pool[j]) {
1137 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer);
1138 usb_free_urb(mos7720_port->write_urb_pool[j]);
1139 }
1140 }
1141
1142 /* While closing port, shutdown all bulk read, write *
1143 * and interrupt read if they exists, otherwise nop */
1144 usb_kill_urb(port->write_urb);
1145 usb_kill_urb(port->read_urb);
1146
1147 write_mos_reg(serial, port->port_number, MCR, 0x00);
1148 write_mos_reg(serial, port->port_number, IER, 0x00);
1149
1150 mos7720_port->open = 0;
1151 }
1152
1153 static void mos7720_break(struct tty_struct *tty, int break_state)
1154 {
1155 struct usb_serial_port *port = tty->driver_data;
1156 unsigned char data;
1157 struct usb_serial *serial;
1158 struct moschip_port *mos7720_port;
1159
1160 serial = port->serial;
1161
1162 mos7720_port = usb_get_serial_port_data(port);
1163 if (mos7720_port == NULL)
1164 return;
1165
1166 if (break_state == -1)
1167 data = mos7720_port->shadowLCR | UART_LCR_SBC;
1168 else
1169 data = mos7720_port->shadowLCR & ~UART_LCR_SBC;
1170
1171 mos7720_port->shadowLCR = data;
1172 write_mos_reg(serial, port->port_number, LCR, mos7720_port->shadowLCR);
1173 }
1174
1175 /*
1176 * mos7720_write_room
1177 * this function is called by the tty driver when it wants to know how many
1178 * bytes of data we can accept for a specific port.
1179 * If successful, we return the amount of room that we have for this port
1180 * Otherwise we return a negative error number.
1181 */
1182 static int mos7720_write_room(struct tty_struct *tty)
1183 {
1184 struct usb_serial_port *port = tty->driver_data;
1185 struct moschip_port *mos7720_port;
1186 int room = 0;
1187 int i;
1188
1189 mos7720_port = usb_get_serial_port_data(port);
1190 if (mos7720_port == NULL)
1191 return -ENODEV;
1192
1193 /* FIXME: Locking */
1194 for (i = 0; i < NUM_URBS; ++i) {
1195 if (mos7720_port->write_urb_pool[i] &&
1196 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS)
1197 room += URB_TRANSFER_BUFFER_SIZE;
1198 }
1199
1200 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
1201 return room;
1202 }
1203
1204 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port,
1205 const unsigned char *data, int count)
1206 {
1207 int status;
1208 int i;
1209 int bytes_sent = 0;
1210 int transfer_size;
1211
1212 struct moschip_port *mos7720_port;
1213 struct usb_serial *serial;
1214 struct urb *urb;
1215 const unsigned char *current_position = data;
1216
1217 serial = port->serial;
1218
1219 mos7720_port = usb_get_serial_port_data(port);
1220 if (mos7720_port == NULL)
1221 return -ENODEV;
1222
1223 /* try to find a free urb in the list */
1224 urb = NULL;
1225
1226 for (i = 0; i < NUM_URBS; ++i) {
1227 if (mos7720_port->write_urb_pool[i] &&
1228 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) {
1229 urb = mos7720_port->write_urb_pool[i];
1230 dev_dbg(&port->dev, "URB:%d\n", i);
1231 break;
1232 }
1233 }
1234
1235 if (urb == NULL) {
1236 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1237 goto exit;
1238 }
1239
1240 if (urb->transfer_buffer == NULL) {
1241 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1242 GFP_KERNEL);
1243 if (!urb->transfer_buffer)
1244 goto exit;
1245 }
1246 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1247
1248 memcpy(urb->transfer_buffer, current_position, transfer_size);
1249 usb_serial_debug_data(&port->dev, __func__, transfer_size,
1250 urb->transfer_buffer);
1251
1252 /* fill urb with data and submit */
1253 usb_fill_bulk_urb(urb, serial->dev,
1254 usb_sndbulkpipe(serial->dev,
1255 port->bulk_out_endpointAddress),
1256 urb->transfer_buffer, transfer_size,
1257 mos7720_bulk_out_data_callback, mos7720_port);
1258
1259 /* send it down the pipe */
1260 status = usb_submit_urb(urb, GFP_ATOMIC);
1261 if (status) {
1262 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1263 "with status = %d\n", __func__, status);
1264 bytes_sent = status;
1265 goto exit;
1266 }
1267 bytes_sent = transfer_size;
1268
1269 exit:
1270 return bytes_sent;
1271 }
1272
1273 static void mos7720_throttle(struct tty_struct *tty)
1274 {
1275 struct usb_serial_port *port = tty->driver_data;
1276 struct moschip_port *mos7720_port;
1277 int status;
1278
1279 mos7720_port = usb_get_serial_port_data(port);
1280
1281 if (mos7720_port == NULL)
1282 return;
1283
1284 if (!mos7720_port->open) {
1285 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1286 return;
1287 }
1288
1289 /* if we are implementing XON/XOFF, send the stop character */
1290 if (I_IXOFF(tty)) {
1291 unsigned char stop_char = STOP_CHAR(tty);
1292 status = mos7720_write(tty, port, &stop_char, 1);
1293 if (status <= 0)
1294 return;
1295 }
1296
1297 /* if we are implementing RTS/CTS, toggle that line */
1298 if (tty->termios.c_cflag & CRTSCTS) {
1299 mos7720_port->shadowMCR &= ~UART_MCR_RTS;
1300 write_mos_reg(port->serial, port->port_number, MCR,
1301 mos7720_port->shadowMCR);
1302 if (status != 0)
1303 return;
1304 }
1305 }
1306
1307 static void mos7720_unthrottle(struct tty_struct *tty)
1308 {
1309 struct usb_serial_port *port = tty->driver_data;
1310 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1311 int status;
1312
1313 if (mos7720_port == NULL)
1314 return;
1315
1316 if (!mos7720_port->open) {
1317 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1318 return;
1319 }
1320
1321 /* if we are implementing XON/XOFF, send the start character */
1322 if (I_IXOFF(tty)) {
1323 unsigned char start_char = START_CHAR(tty);
1324 status = mos7720_write(tty, port, &start_char, 1);
1325 if (status <= 0)
1326 return;
1327 }
1328
1329 /* if we are implementing RTS/CTS, toggle that line */
1330 if (tty->termios.c_cflag & CRTSCTS) {
1331 mos7720_port->shadowMCR |= UART_MCR_RTS;
1332 write_mos_reg(port->serial, port->port_number, MCR,
1333 mos7720_port->shadowMCR);
1334 if (status != 0)
1335 return;
1336 }
1337 }
1338
1339 /* FIXME: this function does not work */
1340 static int set_higher_rates(struct moschip_port *mos7720_port,
1341 unsigned int baud)
1342 {
1343 struct usb_serial_port *port;
1344 struct usb_serial *serial;
1345 int port_number;
1346 enum mos_regs sp_reg;
1347 if (mos7720_port == NULL)
1348 return -EINVAL;
1349
1350 port = mos7720_port->port;
1351 serial = port->serial;
1352
1353 /***********************************************
1354 * Init Sequence for higher rates
1355 ***********************************************/
1356 dev_dbg(&port->dev, "Sending Setting Commands ..........\n");
1357 port_number = port->port_number;
1358
1359 write_mos_reg(serial, port_number, IER, 0x00);
1360 write_mos_reg(serial, port_number, FCR, 0x00);
1361 write_mos_reg(serial, port_number, FCR, 0xcf);
1362 mos7720_port->shadowMCR = 0x0b;
1363 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1364 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x00);
1365
1366 /***********************************************
1367 * Set for higher rates *
1368 ***********************************************/
1369 /* writing baud rate verbatum into uart clock field clearly not right */
1370 if (port_number == 0)
1371 sp_reg = SP1_REG;
1372 else
1373 sp_reg = SP2_REG;
1374 write_mos_reg(serial, dummy, sp_reg, baud * 0x10);
1375 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x03);
1376 mos7720_port->shadowMCR = 0x2b;
1377 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1378
1379 /***********************************************
1380 * Set DLL/DLM
1381 ***********************************************/
1382 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1383 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1384 write_mos_reg(serial, port_number, DLL, 0x01);
1385 write_mos_reg(serial, port_number, DLM, 0x00);
1386 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1387 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1388
1389 return 0;
1390 }
1391
1392 /* baud rate information */
1393 struct divisor_table_entry {
1394 __u32 baudrate;
1395 __u16 divisor;
1396 };
1397
1398 /* Define table of divisors for moschip 7720 hardware *
1399 * These assume a 3.6864MHz crystal, the standard /16, and *
1400 * MCR.7 = 0. */
1401 static struct divisor_table_entry divisor_table[] = {
1402 { 50, 2304},
1403 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */
1404 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */
1405 { 150, 768},
1406 { 300, 384},
1407 { 600, 192},
1408 { 1200, 96},
1409 { 1800, 64},
1410 { 2400, 48},
1411 { 4800, 24},
1412 { 7200, 16},
1413 { 9600, 12},
1414 { 19200, 6},
1415 { 38400, 3},
1416 { 57600, 2},
1417 { 115200, 1},
1418 };
1419
1420 /*****************************************************************************
1421 * calc_baud_rate_divisor
1422 * this function calculates the proper baud rate divisor for the specified
1423 * baud rate.
1424 *****************************************************************************/
1425 static int calc_baud_rate_divisor(struct usb_serial_port *port, int baudrate, int *divisor)
1426 {
1427 int i;
1428 __u16 custom;
1429 __u16 round1;
1430 __u16 round;
1431
1432
1433 dev_dbg(&port->dev, "%s - %d\n", __func__, baudrate);
1434
1435 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) {
1436 if (divisor_table[i].baudrate == baudrate) {
1437 *divisor = divisor_table[i].divisor;
1438 return 0;
1439 }
1440 }
1441
1442 /* After trying for all the standard baud rates *
1443 * Try calculating the divisor for this baud rate */
1444 if (baudrate > 75 && baudrate < 230400) {
1445 /* get the divisor */
1446 custom = (__u16)(230400L / baudrate);
1447
1448 /* Check for round off */
1449 round1 = (__u16)(2304000L / baudrate);
1450 round = (__u16)(round1 - (custom * 10));
1451 if (round > 4)
1452 custom++;
1453 *divisor = custom;
1454
1455 dev_dbg(&port->dev, "Baud %d = %d\n", baudrate, custom);
1456 return 0;
1457 }
1458
1459 dev_dbg(&port->dev, "Baud calculation Failed...\n");
1460 return -EINVAL;
1461 }
1462
1463 /*
1464 * send_cmd_write_baud_rate
1465 * this function sends the proper command to change the baud rate of the
1466 * specified port.
1467 */
1468 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port,
1469 int baudrate)
1470 {
1471 struct usb_serial_port *port;
1472 struct usb_serial *serial;
1473 int divisor;
1474 int status;
1475 unsigned char number;
1476
1477 if (mos7720_port == NULL)
1478 return -1;
1479
1480 port = mos7720_port->port;
1481 serial = port->serial;
1482
1483 number = port->port_number;
1484 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudrate);
1485
1486 /* Calculate the Divisor */
1487 status = calc_baud_rate_divisor(port, baudrate, &divisor);
1488 if (status) {
1489 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1490 return status;
1491 }
1492
1493 /* Enable access to divisor latch */
1494 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1495 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR);
1496
1497 /* Write the divisor */
1498 write_mos_reg(serial, number, DLL, (__u8)(divisor & 0xff));
1499 write_mos_reg(serial, number, DLM, (__u8)((divisor & 0xff00) >> 8));
1500
1501 /* Disable access to divisor latch */
1502 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1503 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR);
1504
1505 return status;
1506 }
1507
1508 /*
1509 * change_port_settings
1510 * This routine is called to set the UART on the device to match
1511 * the specified new settings.
1512 */
1513 static void change_port_settings(struct tty_struct *tty,
1514 struct moschip_port *mos7720_port,
1515 struct ktermios *old_termios)
1516 {
1517 struct usb_serial_port *port;
1518 struct usb_serial *serial;
1519 int baud;
1520 unsigned cflag;
1521 unsigned iflag;
1522 __u8 mask = 0xff;
1523 __u8 lData;
1524 __u8 lParity;
1525 __u8 lStop;
1526 int status;
1527 int port_number;
1528
1529 if (mos7720_port == NULL)
1530 return ;
1531
1532 port = mos7720_port->port;
1533 serial = port->serial;
1534 port_number = port->port_number;
1535
1536 if (!mos7720_port->open) {
1537 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1538 return;
1539 }
1540
1541 lData = UART_LCR_WLEN8;
1542 lStop = 0x00; /* 1 stop bit */
1543 lParity = 0x00; /* No parity */
1544
1545 cflag = tty->termios.c_cflag;
1546 iflag = tty->termios.c_iflag;
1547
1548 /* Change the number of bits */
1549 switch (cflag & CSIZE) {
1550 case CS5:
1551 lData = UART_LCR_WLEN5;
1552 mask = 0x1f;
1553 break;
1554
1555 case CS6:
1556 lData = UART_LCR_WLEN6;
1557 mask = 0x3f;
1558 break;
1559
1560 case CS7:
1561 lData = UART_LCR_WLEN7;
1562 mask = 0x7f;
1563 break;
1564 default:
1565 case CS8:
1566 lData = UART_LCR_WLEN8;
1567 break;
1568 }
1569
1570 /* Change the Parity bit */
1571 if (cflag & PARENB) {
1572 if (cflag & PARODD) {
1573 lParity = UART_LCR_PARITY;
1574 dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1575 } else {
1576 lParity = (UART_LCR_EPAR | UART_LCR_PARITY);
1577 dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1578 }
1579
1580 } else {
1581 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1582 }
1583
1584 if (cflag & CMSPAR)
1585 lParity = lParity | 0x20;
1586
1587 /* Change the Stop bit */
1588 if (cflag & CSTOPB) {
1589 lStop = UART_LCR_STOP;
1590 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1591 } else {
1592 lStop = 0x00;
1593 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1594 }
1595
1596 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
1597 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
1598 #define LCR_PAR_MASK 0x38 /* Mask for parity field */
1599
1600 /* Update the LCR with the correct value */
1601 mos7720_port->shadowLCR &=
1602 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1603 mos7720_port->shadowLCR |= (lData | lParity | lStop);
1604
1605
1606 /* Disable Interrupts */
1607 write_mos_reg(serial, port_number, IER, 0x00);
1608 write_mos_reg(serial, port_number, FCR, 0x00);
1609 write_mos_reg(serial, port_number, FCR, 0xcf);
1610
1611 /* Send the updated LCR value to the mos7720 */
1612 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1613 mos7720_port->shadowMCR = 0x0b;
1614 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1615
1616 /* set up the MCR register and send it to the mos7720 */
1617 mos7720_port->shadowMCR = UART_MCR_OUT2;
1618 if (cflag & CBAUD)
1619 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS);
1620
1621 if (cflag & CRTSCTS) {
1622 mos7720_port->shadowMCR |= (UART_MCR_XONANY);
1623 /* To set hardware flow control to the specified *
1624 * serial port, in SP1/2_CONTROL_REG */
1625 if (port_number)
1626 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x01);
1627 else
1628 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x02);
1629
1630 } else
1631 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY);
1632
1633 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1634
1635 /* Determine divisor based on baud rate */
1636 baud = tty_get_baud_rate(tty);
1637 if (!baud) {
1638 /* pick a default, any default... */
1639 dev_dbg(&port->dev, "Picked default baud...\n");
1640 baud = 9600;
1641 }
1642
1643 if (baud >= 230400) {
1644 set_higher_rates(mos7720_port, baud);
1645 /* Enable Interrupts */
1646 write_mos_reg(serial, port_number, IER, 0x0c);
1647 return;
1648 }
1649
1650 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1651 status = send_cmd_write_baud_rate(mos7720_port, baud);
1652 /* FIXME: needs to write actual resulting baud back not just
1653 blindly do so */
1654 if (cflag & CBAUD)
1655 tty_encode_baud_rate(tty, baud, baud);
1656 /* Enable Interrupts */
1657 write_mos_reg(serial, port_number, IER, 0x0c);
1658
1659 if (port->read_urb->status != -EINPROGRESS) {
1660 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1661 if (status)
1662 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status);
1663 }
1664 }
1665
1666 /*
1667 * mos7720_set_termios
1668 * this function is called by the tty driver when it wants to change the
1669 * termios structure.
1670 */
1671 static void mos7720_set_termios(struct tty_struct *tty,
1672 struct usb_serial_port *port, struct ktermios *old_termios)
1673 {
1674 int status;
1675 unsigned int cflag;
1676 struct usb_serial *serial;
1677 struct moschip_port *mos7720_port;
1678
1679 serial = port->serial;
1680
1681 mos7720_port = usb_get_serial_port_data(port);
1682
1683 if (mos7720_port == NULL)
1684 return;
1685
1686 if (!mos7720_port->open) {
1687 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1688 return;
1689 }
1690
1691 dev_dbg(&port->dev, "setting termios - ASPIRE\n");
1692
1693 cflag = tty->termios.c_cflag;
1694
1695 dev_dbg(&port->dev, "%s - cflag %08x iflag %08x\n", __func__,
1696 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
1697
1698 dev_dbg(&port->dev, "%s - old cflag %08x old iflag %08x\n", __func__,
1699 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
1700
1701 /* change the port settings to the new ones specified */
1702 change_port_settings(tty, mos7720_port, old_termios);
1703
1704 if (port->read_urb->status != -EINPROGRESS) {
1705 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1706 if (status)
1707 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status);
1708 }
1709 }
1710
1711 /*
1712 * get_lsr_info - get line status register info
1713 *
1714 * Purpose: Let user call ioctl() to get info when the UART physically
1715 * is emptied. On bus types like RS485, the transmitter must
1716 * release the bus after transmitting. This must be done when
1717 * the transmit shift register is empty, not be done when the
1718 * transmit holding register is empty. This functionality
1719 * allows an RS485 driver to be written in user space.
1720 */
1721 static int get_lsr_info(struct tty_struct *tty,
1722 struct moschip_port *mos7720_port, unsigned int __user *value)
1723 {
1724 struct usb_serial_port *port = tty->driver_data;
1725 unsigned int result = 0;
1726 unsigned char data = 0;
1727 int port_number = port->port_number;
1728 int count;
1729
1730 count = mos7720_chars_in_buffer(tty);
1731 if (count == 0) {
1732 read_mos_reg(port->serial, port_number, LSR, &data);
1733 if ((data & (UART_LSR_TEMT | UART_LSR_THRE))
1734 == (UART_LSR_TEMT | UART_LSR_THRE)) {
1735 dev_dbg(&port->dev, "%s -- Empty\n", __func__);
1736 result = TIOCSER_TEMT;
1737 }
1738 }
1739 if (copy_to_user(value, &result, sizeof(int)))
1740 return -EFAULT;
1741 return 0;
1742 }
1743
1744 static int mos7720_tiocmget(struct tty_struct *tty)
1745 {
1746 struct usb_serial_port *port = tty->driver_data;
1747 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1748 unsigned int result = 0;
1749 unsigned int mcr ;
1750 unsigned int msr ;
1751
1752 mcr = mos7720_port->shadowMCR;
1753 msr = mos7720_port->shadowMSR;
1754
1755 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */
1756 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */
1757 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */
1758 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */
1759 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */
1760 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
1761
1762 return result;
1763 }
1764
1765 static int mos7720_tiocmset(struct tty_struct *tty,
1766 unsigned int set, unsigned int clear)
1767 {
1768 struct usb_serial_port *port = tty->driver_data;
1769 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1770 unsigned int mcr ;
1771
1772 mcr = mos7720_port->shadowMCR;
1773
1774 if (set & TIOCM_RTS)
1775 mcr |= UART_MCR_RTS;
1776 if (set & TIOCM_DTR)
1777 mcr |= UART_MCR_DTR;
1778 if (set & TIOCM_LOOP)
1779 mcr |= UART_MCR_LOOP;
1780
1781 if (clear & TIOCM_RTS)
1782 mcr &= ~UART_MCR_RTS;
1783 if (clear & TIOCM_DTR)
1784 mcr &= ~UART_MCR_DTR;
1785 if (clear & TIOCM_LOOP)
1786 mcr &= ~UART_MCR_LOOP;
1787
1788 mos7720_port->shadowMCR = mcr;
1789 write_mos_reg(port->serial, port->port_number, MCR,
1790 mos7720_port->shadowMCR);
1791
1792 return 0;
1793 }
1794
1795 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd,
1796 unsigned int __user *value)
1797 {
1798 unsigned int mcr;
1799 unsigned int arg;
1800
1801 struct usb_serial_port *port;
1802
1803 if (mos7720_port == NULL)
1804 return -1;
1805
1806 port = (struct usb_serial_port *)mos7720_port->port;
1807 mcr = mos7720_port->shadowMCR;
1808
1809 if (copy_from_user(&arg, value, sizeof(int)))
1810 return -EFAULT;
1811
1812 switch (cmd) {
1813 case TIOCMBIS:
1814 if (arg & TIOCM_RTS)
1815 mcr |= UART_MCR_RTS;
1816 if (arg & TIOCM_DTR)
1817 mcr |= UART_MCR_RTS;
1818 if (arg & TIOCM_LOOP)
1819 mcr |= UART_MCR_LOOP;
1820 break;
1821
1822 case TIOCMBIC:
1823 if (arg & TIOCM_RTS)
1824 mcr &= ~UART_MCR_RTS;
1825 if (arg & TIOCM_DTR)
1826 mcr &= ~UART_MCR_RTS;
1827 if (arg & TIOCM_LOOP)
1828 mcr &= ~UART_MCR_LOOP;
1829 break;
1830
1831 }
1832
1833 mos7720_port->shadowMCR = mcr;
1834 write_mos_reg(port->serial, port->port_number, MCR,
1835 mos7720_port->shadowMCR);
1836
1837 return 0;
1838 }
1839
1840 static int get_serial_info(struct moschip_port *mos7720_port,
1841 struct serial_struct __user *retinfo)
1842 {
1843 struct serial_struct tmp;
1844
1845 if (!retinfo)
1846 return -EFAULT;
1847
1848 memset(&tmp, 0, sizeof(tmp));
1849
1850 tmp.type = PORT_16550A;
1851 tmp.line = mos7720_port->port->minor;
1852 tmp.port = mos7720_port->port->port_number;
1853 tmp.irq = 0;
1854 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
1855 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1856 tmp.baud_base = 9600;
1857 tmp.close_delay = 5*HZ;
1858 tmp.closing_wait = 30*HZ;
1859
1860 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1861 return -EFAULT;
1862 return 0;
1863 }
1864
1865 static int mos7720_ioctl(struct tty_struct *tty,
1866 unsigned int cmd, unsigned long arg)
1867 {
1868 struct usb_serial_port *port = tty->driver_data;
1869 struct moschip_port *mos7720_port;
1870
1871 mos7720_port = usb_get_serial_port_data(port);
1872 if (mos7720_port == NULL)
1873 return -ENODEV;
1874
1875 switch (cmd) {
1876 case TIOCSERGETLSR:
1877 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
1878 return get_lsr_info(tty, mos7720_port,
1879 (unsigned int __user *)arg);
1880
1881 /* FIXME: These should be using the mode methods */
1882 case TIOCMBIS:
1883 case TIOCMBIC:
1884 dev_dbg(&port->dev, "%s TIOCMSET/TIOCMBIC/TIOCMSET\n", __func__);
1885 return set_modem_info(mos7720_port, cmd,
1886 (unsigned int __user *)arg);
1887
1888 case TIOCGSERIAL:
1889 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
1890 return get_serial_info(mos7720_port,
1891 (struct serial_struct __user *)arg);
1892 }
1893
1894 return -ENOIOCTLCMD;
1895 }
1896
1897 static int mos7720_startup(struct usb_serial *serial)
1898 {
1899 struct usb_device *dev;
1900 char data;
1901 u16 product;
1902 int ret_val;
1903
1904 product = le16_to_cpu(serial->dev->descriptor.idProduct);
1905 dev = serial->dev;
1906
1907 /*
1908 * The 7715 uses the first bulk in/out endpoint pair for the parallel
1909 * port, and the second for the serial port. Because the usbserial core
1910 * assumes both pairs are serial ports, we must engage in a bit of
1911 * subterfuge and swap the pointers for ports 0 and 1 in order to make
1912 * port 0 point to the serial port. However, both moschip devices use a
1913 * single interrupt-in endpoint for both ports (as mentioned a little
1914 * further down), and this endpoint was assigned to port 0. So after
1915 * the swap, we must copy the interrupt endpoint elements from port 1
1916 * (as newly assigned) to port 0, and null out port 1 pointers.
1917 */
1918 if (product == MOSCHIP_DEVICE_ID_7715) {
1919 struct usb_serial_port *tmp = serial->port[0];
1920 serial->port[0] = serial->port[1];
1921 serial->port[1] = tmp;
1922 serial->port[0]->interrupt_in_urb = tmp->interrupt_in_urb;
1923 serial->port[0]->interrupt_in_buffer = tmp->interrupt_in_buffer;
1924 serial->port[0]->interrupt_in_endpointAddress =
1925 tmp->interrupt_in_endpointAddress;
1926 serial->port[1]->interrupt_in_urb = NULL;
1927 serial->port[1]->interrupt_in_buffer = NULL;
1928 }
1929
1930 /* setting configuration feature to one */
1931 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1932 (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5000);
1933
1934 /* start the interrupt urb */
1935 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL);
1936 if (ret_val)
1937 dev_err(&dev->dev,
1938 "%s - Error %d submitting control urb\n",
1939 __func__, ret_val);
1940
1941 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
1942 if (product == MOSCHIP_DEVICE_ID_7715) {
1943 ret_val = mos7715_parport_init(serial);
1944 if (ret_val < 0)
1945 return ret_val;
1946 }
1947 #endif
1948 /* LSR For Port 1 */
1949 read_mos_reg(serial, 0, LSR, &data);
1950 dev_dbg(&dev->dev, "LSR:%x\n", data);
1951
1952 return 0;
1953 }
1954
1955 static void mos7720_release(struct usb_serial *serial)
1956 {
1957 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
1958 /* close the parallel port */
1959
1960 if (le16_to_cpu(serial->dev->descriptor.idProduct)
1961 == MOSCHIP_DEVICE_ID_7715) {
1962 struct urbtracker *urbtrack;
1963 unsigned long flags;
1964 struct mos7715_parport *mos_parport =
1965 usb_get_serial_data(serial);
1966
1967 /* prevent NULL ptr dereference in port callbacks */
1968 spin_lock(&release_lock);
1969 mos_parport->pp->private_data = NULL;
1970 spin_unlock(&release_lock);
1971
1972 /* wait for synchronous usb calls to return */
1973 if (mos_parport->msg_pending)
1974 wait_for_completion_timeout(&mos_parport->syncmsg_compl,
1975 msecs_to_jiffies(MOS_WDR_TIMEOUT));
1976
1977 parport_remove_port(mos_parport->pp);
1978 usb_set_serial_data(serial, NULL);
1979 mos_parport->serial = NULL;
1980
1981 /* if tasklet currently scheduled, wait for it to complete */
1982 tasklet_kill(&mos_parport->urb_tasklet);
1983
1984 /* unlink any urbs sent by the tasklet */
1985 spin_lock_irqsave(&mos_parport->listlock, flags);
1986 list_for_each_entry(urbtrack,
1987 &mos_parport->active_urbs,
1988 urblist_entry)
1989 usb_unlink_urb(urbtrack->urb);
1990 spin_unlock_irqrestore(&mos_parport->listlock, flags);
1991
1992 kref_put(&mos_parport->ref_count, destroy_mos_parport);
1993 }
1994 #endif
1995 }
1996
1997 static int mos7720_port_probe(struct usb_serial_port *port)
1998 {
1999 struct moschip_port *mos7720_port;
2000
2001 mos7720_port = kzalloc(sizeof(*mos7720_port), GFP_KERNEL);
2002 if (!mos7720_port)
2003 return -ENOMEM;
2004
2005 /* Initialize all port interrupt end point to port 0 int endpoint.
2006 * Our device has only one interrupt endpoint common to all ports.
2007 */
2008 port->interrupt_in_endpointAddress =
2009 port->serial->port[0]->interrupt_in_endpointAddress;
2010 mos7720_port->port = port;
2011
2012 usb_set_serial_port_data(port, mos7720_port);
2013
2014 return 0;
2015 }
2016
2017 static int mos7720_port_remove(struct usb_serial_port *port)
2018 {
2019 struct moschip_port *mos7720_port;
2020
2021 mos7720_port = usb_get_serial_port_data(port);
2022 kfree(mos7720_port);
2023
2024 return 0;
2025 }
2026
2027 static struct usb_serial_driver moschip7720_2port_driver = {
2028 .driver = {
2029 .owner = THIS_MODULE,
2030 .name = "moschip7720",
2031 },
2032 .description = "Moschip 2 port adapter",
2033 .id_table = id_table,
2034 .calc_num_ports = mos77xx_calc_num_ports,
2035 .open = mos7720_open,
2036 .close = mos7720_close,
2037 .throttle = mos7720_throttle,
2038 .unthrottle = mos7720_unthrottle,
2039 .probe = mos77xx_probe,
2040 .attach = mos7720_startup,
2041 .release = mos7720_release,
2042 .port_probe = mos7720_port_probe,
2043 .port_remove = mos7720_port_remove,
2044 .ioctl = mos7720_ioctl,
2045 .tiocmget = mos7720_tiocmget,
2046 .tiocmset = mos7720_tiocmset,
2047 .set_termios = mos7720_set_termios,
2048 .write = mos7720_write,
2049 .write_room = mos7720_write_room,
2050 .chars_in_buffer = mos7720_chars_in_buffer,
2051 .break_ctl = mos7720_break,
2052 .read_bulk_callback = mos7720_bulk_in_callback,
2053 .read_int_callback = NULL /* dynamically assigned in probe() */
2054 };
2055
2056 static struct usb_serial_driver * const serial_drivers[] = {
2057 &moschip7720_2port_driver, NULL
2058 };
2059
2060 module_usb_serial_driver(serial_drivers, id_table);
2061
2062 MODULE_AUTHOR(DRIVER_AUTHOR);
2063 MODULE_DESCRIPTION(DRIVER_DESC);
2064 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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