?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Linux 3.12.39
[linux/fpc-iii.git] / drivers / usb / serial / mos7720.c
blob84657e07dc5d6b914bd88da4697ab2f8c8b22de1
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 struct usb_ctrlrequest *setup;
94 };
95
96 enum mos7715_pp_modes {
97 SPP = 0<<5,
98 PS2 = 1<<5, /* moschip calls this 'NIBBLE' mode */
99 PPF = 2<<5, /* moschip calls this 'CB-FIFO mode */
100 };
101
102 struct mos7715_parport {
103 struct parport *pp; /* back to containing struct */
104 struct kref ref_count; /* to instance of this struct */
105 struct list_head deferred_urbs; /* list deferred async urbs */
106 struct list_head active_urbs; /* list async urbs in flight */
107 spinlock_t listlock; /* protects list access */
108 bool msg_pending; /* usb sync call pending */
109 struct completion syncmsg_compl; /* usb sync call completed */
110 struct tasklet_struct urb_tasklet; /* for sending deferred urbs */
111 struct usb_serial *serial; /* back to containing struct */
112 __u8 shadowECR; /* parallel port regs... */
113 __u8 shadowDCR;
114 atomic_t shadowDSR; /* updated in int-in callback */
115 };
116
117 /* lock guards against dereferencing NULL ptr in parport ops callbacks */
118 static DEFINE_SPINLOCK(release_lock);
119
120 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
121
122 static const unsigned int dummy; /* for clarity in register access fns */
123
124 enum mos_regs {
125 THR, /* serial port regs */
126 RHR,
127 IER,
128 FCR,
129 ISR,
130 LCR,
131 MCR,
132 LSR,
133 MSR,
134 SPR,
135 DLL,
136 DLM,
137 DPR, /* parallel port regs */
138 DSR,
139 DCR,
140 ECR,
141 SP1_REG, /* device control regs */
142 SP2_REG, /* serial port 2 (7720 only) */
143 PP_REG,
144 SP_CONTROL_REG,
145 };
146
147 /*
148 * Return the correct value for the Windex field of the setup packet
149 * for a control endpoint message. See the 7715 datasheet.
150 */
151 static inline __u16 get_reg_index(enum mos_regs reg)
152 {
153 static const __u16 mos7715_index_lookup_table[] = {
154 0x00, /* THR */
155 0x00, /* RHR */
156 0x01, /* IER */
157 0x02, /* FCR */
158 0x02, /* ISR */
159 0x03, /* LCR */
160 0x04, /* MCR */
161 0x05, /* LSR */
162 0x06, /* MSR */
163 0x07, /* SPR */
164 0x00, /* DLL */
165 0x01, /* DLM */
166 0x00, /* DPR */
167 0x01, /* DSR */
168 0x02, /* DCR */
169 0x0a, /* ECR */
170 0x01, /* SP1_REG */
171 0x02, /* SP2_REG (7720 only) */
172 0x04, /* PP_REG (7715 only) */
173 0x08, /* SP_CONTROL_REG */
174 };
175 return mos7715_index_lookup_table[reg];
176 }
177
178 /*
179 * Return the correct value for the upper byte of the Wvalue field of
180 * the setup packet for a control endpoint message.
181 */
182 static inline __u16 get_reg_value(enum mos_regs reg,
183 unsigned int serial_portnum)
184 {
185 if (reg >= SP1_REG) /* control reg */
186 return 0x0000;
187
188 else if (reg >= DPR) /* parallel port reg (7715 only) */
189 return 0x0100;
190
191 else /* serial port reg */
192 return (serial_portnum + 2) << 8;
193 }
194
195 /*
196 * Write data byte to the specified device register. The data is embedded in
197 * the value field of the setup packet. serial_portnum is ignored for registers
198 * not specific to a particular serial port.
199 */
200 static int write_mos_reg(struct usb_serial *serial, unsigned int serial_portnum,
201 enum mos_regs reg, __u8 data)
202 {
203 struct usb_device *usbdev = serial->dev;
204 unsigned int pipe = usb_sndctrlpipe(usbdev, 0);
205 __u8 request = (__u8)0x0e;
206 __u8 requesttype = (__u8)0x40;
207 __u16 index = get_reg_index(reg);
208 __u16 value = get_reg_value(reg, serial_portnum) + data;
209 int status = usb_control_msg(usbdev, pipe, request, requesttype, value,
210 index, NULL, 0, MOS_WDR_TIMEOUT);
211 if (status < 0)
212 dev_err(&usbdev->dev,
213 "mos7720: usb_control_msg() failed: %d", status);
214 return status;
215 }
216
217 /*
218 * Read data byte from the specified device register. The data returned by the
219 * device is embedded in the value field of the setup packet. serial_portnum is
220 * ignored for registers that are not specific to a particular serial port.
221 */
222 static int read_mos_reg(struct usb_serial *serial, unsigned int serial_portnum,
223 enum mos_regs reg, __u8 *data)
224 {
225 struct usb_device *usbdev = serial->dev;
226 unsigned int pipe = usb_rcvctrlpipe(usbdev, 0);
227 __u8 request = (__u8)0x0d;
228 __u8 requesttype = (__u8)0xc0;
229 __u16 index = get_reg_index(reg);
230 __u16 value = get_reg_value(reg, serial_portnum);
231 u8 *buf;
232 int status;
233
234 buf = kmalloc(1, GFP_KERNEL);
235 if (!buf)
236 return -ENOMEM;
237
238 status = usb_control_msg(usbdev, pipe, request, requesttype, value,
239 index, buf, 1, MOS_WDR_TIMEOUT);
240 if (status == 1)
241 *data = *buf;
242 else if (status < 0)
243 dev_err(&usbdev->dev,
244 "mos7720: usb_control_msg() failed: %d", status);
245 kfree(buf);
246
247 return status;
248 }
249
250 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
251
252 static inline int mos7715_change_mode(struct mos7715_parport *mos_parport,
253 enum mos7715_pp_modes mode)
254 {
255 mos_parport->shadowECR = mode;
256 write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR);
257 return 0;
258 }
259
260 static void destroy_mos_parport(struct kref *kref)
261 {
262 struct mos7715_parport *mos_parport =
263 container_of(kref, struct mos7715_parport, ref_count);
264
265 kfree(mos_parport);
266 }
267
268 static void destroy_urbtracker(struct kref *kref)
269 {
270 struct urbtracker *urbtrack =
271 container_of(kref, struct urbtracker, ref_count);
272 struct mos7715_parport *mos_parport = urbtrack->mos_parport;
273
274 usb_free_urb(urbtrack->urb);
275 kfree(urbtrack->setup);
276 kfree(urbtrack);
277 kref_put(&mos_parport->ref_count, destroy_mos_parport);
278 }
279
280 /*
281 * This runs as a tasklet when sending an urb in a non-blocking parallel
282 * port callback had to be deferred because the disconnect mutex could not be
283 * obtained at the time.
284 */
285 static void send_deferred_urbs(unsigned long _mos_parport)
286 {
287 int ret_val;
288 unsigned long flags;
289 struct mos7715_parport *mos_parport = (void *)_mos_parport;
290 struct urbtracker *urbtrack, *tmp;
291 struct list_head *cursor, *next;
292 struct device *dev;
293
294 /* if release function ran, game over */
295 if (unlikely(mos_parport->serial == NULL))
296 return;
297
298 dev = &mos_parport->serial->dev->dev;
299
300 /* try again to get the mutex */
301 if (!mutex_trylock(&mos_parport->serial->disc_mutex)) {
302 dev_dbg(dev, "%s: rescheduling tasklet\n", __func__);
303 tasklet_schedule(&mos_parport->urb_tasklet);
304 return;
305 }
306
307 /* if device disconnected, game over */
308 if (unlikely(mos_parport->serial->disconnected)) {
309 mutex_unlock(&mos_parport->serial->disc_mutex);
310 return;
311 }
312
313 spin_lock_irqsave(&mos_parport->listlock, flags);
314 if (list_empty(&mos_parport->deferred_urbs)) {
315 spin_unlock_irqrestore(&mos_parport->listlock, flags);
316 mutex_unlock(&mos_parport->serial->disc_mutex);
317 dev_dbg(dev, "%s: deferred_urbs list empty\n", __func__);
318 return;
319 }
320
321 /* move contents of deferred_urbs list to active_urbs list and submit */
322 list_for_each_safe(cursor, next, &mos_parport->deferred_urbs)
323 list_move_tail(cursor, &mos_parport->active_urbs);
324 list_for_each_entry_safe(urbtrack, tmp, &mos_parport->active_urbs,
325 urblist_entry) {
326 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
327 dev_dbg(dev, "%s: urb submitted\n", __func__);
328 if (ret_val) {
329 dev_err(dev, "usb_submit_urb() failed: %d\n", ret_val);
330 list_del(&urbtrack->urblist_entry);
331 kref_put(&urbtrack->ref_count, destroy_urbtracker);
332 }
333 }
334 spin_unlock_irqrestore(&mos_parport->listlock, flags);
335 mutex_unlock(&mos_parport->serial->disc_mutex);
336 }
337
338 /* callback for parallel port control urbs submitted asynchronously */
339 static void async_complete(struct urb *urb)
340 {
341 struct urbtracker *urbtrack = urb->context;
342 int status = urb->status;
343
344 if (unlikely(status))
345 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n", __func__, status);
346
347 /* remove the urbtracker from the active_urbs list */
348 spin_lock(&urbtrack->mos_parport->listlock);
349 list_del(&urbtrack->urblist_entry);
350 spin_unlock(&urbtrack->mos_parport->listlock);
351 kref_put(&urbtrack->ref_count, destroy_urbtracker);
352 }
353
354 static int write_parport_reg_nonblock(struct mos7715_parport *mos_parport,
355 enum mos_regs reg, __u8 data)
356 {
357 struct urbtracker *urbtrack;
358 int ret_val;
359 unsigned long flags;
360 struct usb_serial *serial = mos_parport->serial;
361 struct usb_device *usbdev = serial->dev;
362
363 /* create and initialize the control urb and containing urbtracker */
364 urbtrack = kmalloc(sizeof(struct urbtracker), GFP_ATOMIC);
365 if (urbtrack == NULL) {
366 dev_err(&usbdev->dev, "out of memory");
367 return -ENOMEM;
368 }
369 kref_get(&mos_parport->ref_count);
370 urbtrack->mos_parport = mos_parport;
371 urbtrack->urb = usb_alloc_urb(0, GFP_ATOMIC);
372 if (urbtrack->urb == NULL) {
373 dev_err(&usbdev->dev, "out of urbs");
374 kfree(urbtrack);
375 return -ENOMEM;
376 }
377 urbtrack->setup = kmalloc(sizeof(*urbtrack->setup), GFP_ATOMIC);
378 if (!urbtrack->setup) {
379 usb_free_urb(urbtrack->urb);
380 kfree(urbtrack);
381 return -ENOMEM;
382 }
383 urbtrack->setup->bRequestType = (__u8)0x40;
384 urbtrack->setup->bRequest = (__u8)0x0e;
385 urbtrack->setup->wValue = cpu_to_le16(get_reg_value(reg, dummy));
386 urbtrack->setup->wIndex = cpu_to_le16(get_reg_index(reg));
387 urbtrack->setup->wLength = 0;
388 usb_fill_control_urb(urbtrack->urb, usbdev,
389 usb_sndctrlpipe(usbdev, 0),
390 (unsigned char *)urbtrack->setup,
391 NULL, 0, async_complete, urbtrack);
392 kref_init(&urbtrack->ref_count);
393 INIT_LIST_HEAD(&urbtrack->urblist_entry);
394
395 /*
396 * get the disconnect mutex, or add tracker to the deferred_urbs list
397 * and schedule a tasklet to try again later
398 */
399 if (!mutex_trylock(&serial->disc_mutex)) {
400 spin_lock_irqsave(&mos_parport->listlock, flags);
401 list_add_tail(&urbtrack->urblist_entry,
402 &mos_parport->deferred_urbs);
403 spin_unlock_irqrestore(&mos_parport->listlock, flags);
404 tasklet_schedule(&mos_parport->urb_tasklet);
405 dev_dbg(&usbdev->dev, "tasklet scheduled");
406 return 0;
407 }
408
409 /* bail if device disconnected */
410 if (serial->disconnected) {
411 kref_put(&urbtrack->ref_count, destroy_urbtracker);
412 mutex_unlock(&serial->disc_mutex);
413 return -ENODEV;
414 }
415
416 /* add the tracker to the active_urbs list and submit */
417 spin_lock_irqsave(&mos_parport->listlock, flags);
418 list_add_tail(&urbtrack->urblist_entry, &mos_parport->active_urbs);
419 spin_unlock_irqrestore(&mos_parport->listlock, flags);
420 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
421 mutex_unlock(&serial->disc_mutex);
422 if (ret_val) {
423 dev_err(&usbdev->dev,
424 "%s: submit_urb() failed: %d", __func__, ret_val);
425 spin_lock_irqsave(&mos_parport->listlock, flags);
426 list_del(&urbtrack->urblist_entry);
427 spin_unlock_irqrestore(&mos_parport->listlock, flags);
428 kref_put(&urbtrack->ref_count, destroy_urbtracker);
429 return ret_val;
430 }
431 return 0;
432 }
433
434 /*
435 * This is the the common top part of all parallel port callback operations that
436 * send synchronous messages to the device. This implements convoluted locking
437 * that avoids two scenarios: (1) a port operation is called after usbserial
438 * has called our release function, at which point struct mos7715_parport has
439 * been destroyed, and (2) the device has been disconnected, but usbserial has
440 * not called the release function yet because someone has a serial port open.
441 * The shared release_lock prevents the first, and the mutex and disconnected
442 * flag maintained by usbserial covers the second. We also use the msg_pending
443 * flag to ensure that all synchronous usb messgage calls have completed before
444 * our release function can return.
445 */
446 static int parport_prologue(struct parport *pp)
447 {
448 struct mos7715_parport *mos_parport;
449
450 spin_lock(&release_lock);
451 mos_parport = pp->private_data;
452 if (unlikely(mos_parport == NULL)) {
453 /* release fn called, port struct destroyed */
454 spin_unlock(&release_lock);
455 return -1;
456 }
457 mos_parport->msg_pending = true; /* synch usb call pending */
458 INIT_COMPLETION(mos_parport->syncmsg_compl);
459 spin_unlock(&release_lock);
460
461 mutex_lock(&mos_parport->serial->disc_mutex);
462 if (mos_parport->serial->disconnected) {
463 /* device disconnected */
464 mutex_unlock(&mos_parport->serial->disc_mutex);
465 mos_parport->msg_pending = false;
466 complete(&mos_parport->syncmsg_compl);
467 return -1;
468 }
469
470 return 0;
471 }
472
473 /*
474 * This is the the common bottom part of all parallel port functions that send
475 * synchronous messages to the device.
476 */
477 static inline void parport_epilogue(struct parport *pp)
478 {
479 struct mos7715_parport *mos_parport = pp->private_data;
480 mutex_unlock(&mos_parport->serial->disc_mutex);
481 mos_parport->msg_pending = false;
482 complete(&mos_parport->syncmsg_compl);
483 }
484
485 static void parport_mos7715_write_data(struct parport *pp, unsigned char d)
486 {
487 struct mos7715_parport *mos_parport = pp->private_data;
488
489 if (parport_prologue(pp) < 0)
490 return;
491 mos7715_change_mode(mos_parport, SPP);
492 write_mos_reg(mos_parport->serial, dummy, DPR, (__u8)d);
493 parport_epilogue(pp);
494 }
495
496 static unsigned char parport_mos7715_read_data(struct parport *pp)
497 {
498 struct mos7715_parport *mos_parport = pp->private_data;
499 unsigned char d;
500
501 if (parport_prologue(pp) < 0)
502 return 0;
503 read_mos_reg(mos_parport->serial, dummy, DPR, &d);
504 parport_epilogue(pp);
505 return d;
506 }
507
508 static void parport_mos7715_write_control(struct parport *pp, unsigned char d)
509 {
510 struct mos7715_parport *mos_parport = pp->private_data;
511 __u8 data;
512
513 if (parport_prologue(pp) < 0)
514 return;
515 data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0);
516 write_mos_reg(mos_parport->serial, dummy, DCR, data);
517 mos_parport->shadowDCR = data;
518 parport_epilogue(pp);
519 }
520
521 static unsigned char parport_mos7715_read_control(struct parport *pp)
522 {
523 struct mos7715_parport *mos_parport = pp->private_data;
524 __u8 dcr;
525
526 spin_lock(&release_lock);
527 mos_parport = pp->private_data;
528 if (unlikely(mos_parport == NULL)) {
529 spin_unlock(&release_lock);
530 return 0;
531 }
532 dcr = mos_parport->shadowDCR & 0x0f;
533 spin_unlock(&release_lock);
534 return dcr;
535 }
536
537 static unsigned char parport_mos7715_frob_control(struct parport *pp,
538 unsigned char mask,
539 unsigned char val)
540 {
541 struct mos7715_parport *mos_parport = pp->private_data;
542 __u8 dcr;
543
544 mask &= 0x0f;
545 val &= 0x0f;
546 if (parport_prologue(pp) < 0)
547 return 0;
548 mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val;
549 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
550 dcr = mos_parport->shadowDCR & 0x0f;
551 parport_epilogue(pp);
552 return dcr;
553 }
554
555 static unsigned char parport_mos7715_read_status(struct parport *pp)
556 {
557 unsigned char status;
558 struct mos7715_parport *mos_parport = pp->private_data;
559
560 spin_lock(&release_lock);
561 mos_parport = pp->private_data;
562 if (unlikely(mos_parport == NULL)) { /* release called */
563 spin_unlock(&release_lock);
564 return 0;
565 }
566 status = atomic_read(&mos_parport->shadowDSR) & 0xf8;
567 spin_unlock(&release_lock);
568 return status;
569 }
570
571 static void parport_mos7715_enable_irq(struct parport *pp)
572 {
573 }
574
575 static void parport_mos7715_disable_irq(struct parport *pp)
576 {
577 }
578
579 static void parport_mos7715_data_forward(struct parport *pp)
580 {
581 struct mos7715_parport *mos_parport = pp->private_data;
582
583 if (parport_prologue(pp) < 0)
584 return;
585 mos7715_change_mode(mos_parport, PS2);
586 mos_parport->shadowDCR &= ~0x20;
587 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
588 parport_epilogue(pp);
589 }
590
591 static void parport_mos7715_data_reverse(struct parport *pp)
592 {
593 struct mos7715_parport *mos_parport = pp->private_data;
594
595 if (parport_prologue(pp) < 0)
596 return;
597 mos7715_change_mode(mos_parport, PS2);
598 mos_parport->shadowDCR |= 0x20;
599 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
600 parport_epilogue(pp);
601 }
602
603 static void parport_mos7715_init_state(struct pardevice *dev,
604 struct parport_state *s)
605 {
606 s->u.pc.ctr = DCR_INIT_VAL;
607 s->u.pc.ecr = ECR_INIT_VAL;
608 }
609
610 /* N.B. Parport core code requires that this function not block */
611 static void parport_mos7715_save_state(struct parport *pp,
612 struct parport_state *s)
613 {
614 struct mos7715_parport *mos_parport;
615
616 spin_lock(&release_lock);
617 mos_parport = pp->private_data;
618 if (unlikely(mos_parport == NULL)) { /* release called */
619 spin_unlock(&release_lock);
620 return;
621 }
622 s->u.pc.ctr = mos_parport->shadowDCR;
623 s->u.pc.ecr = mos_parport->shadowECR;
624 spin_unlock(&release_lock);
625 }
626
627 /* N.B. Parport core code requires that this function not block */
628 static void parport_mos7715_restore_state(struct parport *pp,
629 struct parport_state *s)
630 {
631 struct mos7715_parport *mos_parport;
632
633 spin_lock(&release_lock);
634 mos_parport = pp->private_data;
635 if (unlikely(mos_parport == NULL)) { /* release called */
636 spin_unlock(&release_lock);
637 return;
638 }
639 write_parport_reg_nonblock(mos_parport, DCR, mos_parport->shadowDCR);
640 write_parport_reg_nonblock(mos_parport, ECR, mos_parport->shadowECR);
641 spin_unlock(&release_lock);
642 }
643
644 static size_t parport_mos7715_write_compat(struct parport *pp,
645 const void *buffer,
646 size_t len, int flags)
647 {
648 int retval;
649 struct mos7715_parport *mos_parport = pp->private_data;
650 int actual_len;
651
652 if (parport_prologue(pp) < 0)
653 return 0;
654 mos7715_change_mode(mos_parport, PPF);
655 retval = usb_bulk_msg(mos_parport->serial->dev,
656 usb_sndbulkpipe(mos_parport->serial->dev, 2),
657 (void *)buffer, len, &actual_len,
658 MOS_WDR_TIMEOUT);
659 parport_epilogue(pp);
660 if (retval) {
661 dev_err(&mos_parport->serial->dev->dev,
662 "mos7720: usb_bulk_msg() failed: %d", retval);
663 return 0;
664 }
665 return actual_len;
666 }
667
668 static struct parport_operations parport_mos7715_ops = {
669 .owner = THIS_MODULE,
670 .write_data = parport_mos7715_write_data,
671 .read_data = parport_mos7715_read_data,
672
673 .write_control = parport_mos7715_write_control,
674 .read_control = parport_mos7715_read_control,
675 .frob_control = parport_mos7715_frob_control,
676
677 .read_status = parport_mos7715_read_status,
678
679 .enable_irq = parport_mos7715_enable_irq,
680 .disable_irq = parport_mos7715_disable_irq,
681
682 .data_forward = parport_mos7715_data_forward,
683 .data_reverse = parport_mos7715_data_reverse,
684
685 .init_state = parport_mos7715_init_state,
686 .save_state = parport_mos7715_save_state,
687 .restore_state = parport_mos7715_restore_state,
688
689 .compat_write_data = parport_mos7715_write_compat,
690
691 .nibble_read_data = parport_ieee1284_read_nibble,
692 .byte_read_data = parport_ieee1284_read_byte,
693 };
694
695 /*
696 * Allocate and initialize parallel port control struct, initialize
697 * the parallel port hardware device, and register with the parport subsystem.
698 */
699 static int mos7715_parport_init(struct usb_serial *serial)
700 {
701 struct mos7715_parport *mos_parport;
702
703 /* allocate and initialize parallel port control struct */
704 mos_parport = kzalloc(sizeof(struct mos7715_parport), GFP_KERNEL);
705 if (mos_parport == NULL) {
706 dev_dbg(&serial->dev->dev, "%s: kzalloc failed\n", __func__);
707 return -ENOMEM;
708 }
709 mos_parport->msg_pending = false;
710 kref_init(&mos_parport->ref_count);
711 spin_lock_init(&mos_parport->listlock);
712 INIT_LIST_HEAD(&mos_parport->active_urbs);
713 INIT_LIST_HEAD(&mos_parport->deferred_urbs);
714 usb_set_serial_data(serial, mos_parport); /* hijack private pointer */
715 mos_parport->serial = serial;
716 tasklet_init(&mos_parport->urb_tasklet, send_deferred_urbs,
717 (unsigned long) mos_parport);
718 init_completion(&mos_parport->syncmsg_compl);
719
720 /* cycle parallel port reset bit */
721 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x80);
722 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x00);
723
724 /* initialize device registers */
725 mos_parport->shadowDCR = DCR_INIT_VAL;
726 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
727 mos_parport->shadowECR = ECR_INIT_VAL;
728 write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR);
729
730 /* register with parport core */
731 mos_parport->pp = parport_register_port(0, PARPORT_IRQ_NONE,
732 PARPORT_DMA_NONE,
733 &parport_mos7715_ops);
734 if (mos_parport->pp == NULL) {
735 dev_err(&serial->interface->dev,
736 "Could not register parport\n");
737 kref_put(&mos_parport->ref_count, destroy_mos_parport);
738 return -EIO;
739 }
740 mos_parport->pp->private_data = mos_parport;
741 mos_parport->pp->modes = PARPORT_MODE_COMPAT | PARPORT_MODE_PCSPP;
742 mos_parport->pp->dev = &serial->interface->dev;
743 parport_announce_port(mos_parport->pp);
744
745 return 0;
746 }
747 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
748
749 /*
750 * mos7720_interrupt_callback
751 * this is the callback function for when we have received data on the
752 * interrupt endpoint.
753 */
754 static void mos7720_interrupt_callback(struct urb *urb)
755 {
756 int result;
757 int length;
758 int status = urb->status;
759 struct device *dev = &urb->dev->dev;
760 __u8 *data;
761 __u8 sp1;
762 __u8 sp2;
763
764 switch (status) {
765 case 0:
766 /* success */
767 break;
768 case -ECONNRESET:
769 case -ENOENT:
770 case -ESHUTDOWN:
771 /* this urb is terminated, clean up */
772 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
773 return;
774 default:
775 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
776 goto exit;
777 }
778
779 length = urb->actual_length;
780 data = urb->transfer_buffer;
781
782 /* Moschip get 4 bytes
783 * Byte 1 IIR Port 1 (port.number is 0)
784 * Byte 2 IIR Port 2 (port.number is 1)
785 * Byte 3 --------------
786 * Byte 4 FIFO status for both */
787
788 /* the above description is inverted
789 * oneukum 2007-03-14 */
790
791 if (unlikely(length != 4)) {
792 dev_dbg(dev, "Wrong data !!!\n");
793 return;
794 }
795
796 sp1 = data[3];
797 sp2 = data[2];
798
799 if ((sp1 | sp2) & 0x01) {
800 /* No Interrupt Pending in both the ports */
801 dev_dbg(dev, "No Interrupt !!!\n");
802 } else {
803 switch (sp1 & 0x0f) {
804 case SERIAL_IIR_RLS:
805 dev_dbg(dev, "Serial Port 1: Receiver status error or address bit detected in 9-bit mode\n");
806 break;
807 case SERIAL_IIR_CTI:
808 dev_dbg(dev, "Serial Port 1: Receiver time out\n");
809 break;
810 case SERIAL_IIR_MS:
811 /* dev_dbg(dev, "Serial Port 1: Modem status change\n"); */
812 break;
813 }
814
815 switch (sp2 & 0x0f) {
816 case SERIAL_IIR_RLS:
817 dev_dbg(dev, "Serial Port 2: Receiver status error or address bit detected in 9-bit mode\n");
818 break;
819 case SERIAL_IIR_CTI:
820 dev_dbg(dev, "Serial Port 2: Receiver time out\n");
821 break;
822 case SERIAL_IIR_MS:
823 /* dev_dbg(dev, "Serial Port 2: Modem status change\n"); */
824 break;
825 }
826 }
827
828 exit:
829 result = usb_submit_urb(urb, GFP_ATOMIC);
830 if (result)
831 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result);
832 }
833
834 /*
835 * mos7715_interrupt_callback
836 * this is the 7715's callback function for when we have received data on
837 * the interrupt endpoint.
838 */
839 static void mos7715_interrupt_callback(struct urb *urb)
840 {
841 int result;
842 int length;
843 int status = urb->status;
844 struct device *dev = &urb->dev->dev;
845 __u8 *data;
846 __u8 iir;
847
848 switch (status) {
849 case 0:
850 /* success */
851 break;
852 case -ECONNRESET:
853 case -ENOENT:
854 case -ESHUTDOWN:
855 case -ENODEV:
856 /* this urb is terminated, clean up */
857 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
858 return;
859 default:
860 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
861 goto exit;
862 }
863
864 length = urb->actual_length;
865 data = urb->transfer_buffer;
866
867 /* Structure of data from 7715 device:
868 * Byte 1: IIR serial Port
869 * Byte 2: unused
870 * Byte 2: DSR parallel port
871 * Byte 4: FIFO status for both */
872
873 if (unlikely(length != 4)) {
874 dev_dbg(dev, "Wrong data !!!\n");
875 return;
876 }
877
878 iir = data[0];
879 if (!(iir & 0x01)) { /* serial port interrupt pending */
880 switch (iir & 0x0f) {
881 case SERIAL_IIR_RLS:
882 dev_dbg(dev, "Serial Port: Receiver status error or address bit detected in 9-bit mode\n\n");
883 break;
884 case SERIAL_IIR_CTI:
885 dev_dbg(dev, "Serial Port: Receiver time out\n");
886 break;
887 case SERIAL_IIR_MS:
888 /* dev_dbg(dev, "Serial Port: Modem status change\n"); */
889 break;
890 }
891 }
892
893 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
894 { /* update local copy of DSR reg */
895 struct usb_serial_port *port = urb->context;
896 struct mos7715_parport *mos_parport = port->serial->private;
897 if (unlikely(mos_parport == NULL))
898 return;
899 atomic_set(&mos_parport->shadowDSR, data[2]);
900 }
901 #endif
902
903 exit:
904 result = usb_submit_urb(urb, GFP_ATOMIC);
905 if (result)
906 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result);
907 }
908
909 /*
910 * mos7720_bulk_in_callback
911 * this is the callback function for when we have received data on the
912 * bulk in endpoint.
913 */
914 static void mos7720_bulk_in_callback(struct urb *urb)
915 {
916 int retval;
917 unsigned char *data ;
918 struct usb_serial_port *port;
919 int status = urb->status;
920
921 if (status) {
922 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
923 return;
924 }
925
926 port = urb->context;
927
928 dev_dbg(&port->dev, "Entering...%s\n", __func__);
929
930 data = urb->transfer_buffer;
931
932 if (urb->actual_length) {
933 tty_insert_flip_string(&port->port, data, urb->actual_length);
934 tty_flip_buffer_push(&port->port);
935 }
936
937 if (port->read_urb->status != -EINPROGRESS) {
938 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
939 if (retval)
940 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
941 }
942 }
943
944 /*
945 * mos7720_bulk_out_data_callback
946 * this is the callback function for when we have finished sending serial
947 * data on the bulk out endpoint.
948 */
949 static void mos7720_bulk_out_data_callback(struct urb *urb)
950 {
951 struct moschip_port *mos7720_port;
952 int status = urb->status;
953
954 if (status) {
955 dev_dbg(&urb->dev->dev, "nonzero write bulk status received:%d\n", status);
956 return;
957 }
958
959 mos7720_port = urb->context;
960 if (!mos7720_port) {
961 dev_dbg(&urb->dev->dev, "NULL mos7720_port pointer\n");
962 return ;
963 }
964
965 if (mos7720_port->open)
966 tty_port_tty_wakeup(&mos7720_port->port->port);
967 }
968
969 /*
970 * mos77xx_probe
971 * this function installs the appropriate read interrupt endpoint callback
972 * depending on whether the device is a 7720 or 7715, thus avoiding costly
973 * run-time checks in the high-frequency callback routine itself.
974 */
975 static int mos77xx_probe(struct usb_serial *serial,
976 const struct usb_device_id *id)
977 {
978 if (id->idProduct == MOSCHIP_DEVICE_ID_7715)
979 moschip7720_2port_driver.read_int_callback =
980 mos7715_interrupt_callback;
981 else
982 moschip7720_2port_driver.read_int_callback =
983 mos7720_interrupt_callback;
984
985 return 0;
986 }
987
988 static int mos77xx_calc_num_ports(struct usb_serial *serial)
989 {
990 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
991 if (product == MOSCHIP_DEVICE_ID_7715)
992 return 1;
993
994 return 2;
995 }
996
997 static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port)
998 {
999 struct usb_serial *serial;
1000 struct urb *urb;
1001 struct moschip_port *mos7720_port;
1002 int response;
1003 int port_number;
1004 __u8 data;
1005 int allocated_urbs = 0;
1006 int j;
1007
1008 serial = port->serial;
1009
1010 mos7720_port = usb_get_serial_port_data(port);
1011 if (mos7720_port == NULL)
1012 return -ENODEV;
1013
1014 usb_clear_halt(serial->dev, port->write_urb->pipe);
1015 usb_clear_halt(serial->dev, port->read_urb->pipe);
1016
1017 /* Initialising the write urb pool */
1018 for (j = 0; j < NUM_URBS; ++j) {
1019 urb = usb_alloc_urb(0, GFP_KERNEL);
1020 mos7720_port->write_urb_pool[j] = urb;
1021
1022 if (urb == NULL) {
1023 dev_err(&port->dev, "No more urbs???\n");
1024 continue;
1025 }
1026
1027 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1028 GFP_KERNEL);
1029 if (!urb->transfer_buffer) {
1030 dev_err(&port->dev,
1031 "%s-out of memory for urb buffers.\n",
1032 __func__);
1033 usb_free_urb(mos7720_port->write_urb_pool[j]);
1034 mos7720_port->write_urb_pool[j] = NULL;
1035 continue;
1036 }
1037 allocated_urbs++;
1038 }
1039
1040 if (!allocated_urbs)
1041 return -ENOMEM;
1042
1043 /* Initialize MCS7720 -- Write Init values to corresponding Registers
1044 *
1045 * Register Index
1046 * 0 : THR/RHR
1047 * 1 : IER
1048 * 2 : FCR
1049 * 3 : LCR
1050 * 4 : MCR
1051 * 5 : LSR
1052 * 6 : MSR
1053 * 7 : SPR
1054 *
1055 * 0x08 : SP1/2 Control Reg
1056 */
1057 port_number = port->port_number;
1058 read_mos_reg(serial, port_number, LSR, &data);
1059
1060 dev_dbg(&port->dev, "SS::%p LSR:%x\n", mos7720_port, data);
1061
1062 write_mos_reg(serial, dummy, SP1_REG, 0x02);
1063 write_mos_reg(serial, dummy, SP2_REG, 0x02);
1064
1065 write_mos_reg(serial, port_number, IER, 0x00);
1066 write_mos_reg(serial, port_number, FCR, 0x00);
1067
1068 write_mos_reg(serial, port_number, FCR, 0xcf);
1069 mos7720_port->shadowLCR = 0x03;
1070 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1071 mos7720_port->shadowMCR = 0x0b;
1072 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1073
1074 write_mos_reg(serial, port_number, SP_CONTROL_REG, 0x00);
1075 read_mos_reg(serial, dummy, SP_CONTROL_REG, &data);
1076 data = data | (port->port_number + 1);
1077 write_mos_reg(serial, dummy, SP_CONTROL_REG, data);
1078 mos7720_port->shadowLCR = 0x83;
1079 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1080 write_mos_reg(serial, port_number, THR, 0x0c);
1081 write_mos_reg(serial, port_number, IER, 0x00);
1082 mos7720_port->shadowLCR = 0x03;
1083 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1084 write_mos_reg(serial, port_number, IER, 0x0c);
1085
1086 response = usb_submit_urb(port->read_urb, GFP_KERNEL);
1087 if (response)
1088 dev_err(&port->dev, "%s - Error %d submitting read urb\n",
1089 __func__, response);
1090
1091 /* initialize our port settings */
1092 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */
1093
1094 /* send a open port command */
1095 mos7720_port->open = 1;
1096
1097 return 0;
1098 }
1099
1100 /*
1101 * mos7720_chars_in_buffer
1102 * this function is called by the tty driver when it wants to know how many
1103 * bytes of data we currently have outstanding in the port (data that has
1104 * been written, but hasn't made it out the port yet)
1105 * If successful, we return the number of bytes left to be written in the
1106 * system,
1107 * Otherwise we return a negative error number.
1108 */
1109 static int mos7720_chars_in_buffer(struct tty_struct *tty)
1110 {
1111 struct usb_serial_port *port = tty->driver_data;
1112 int i;
1113 int chars = 0;
1114 struct moschip_port *mos7720_port;
1115
1116 mos7720_port = usb_get_serial_port_data(port);
1117 if (mos7720_port == NULL)
1118 return 0;
1119
1120 for (i = 0; i < NUM_URBS; ++i) {
1121 if (mos7720_port->write_urb_pool[i] &&
1122 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS)
1123 chars += URB_TRANSFER_BUFFER_SIZE;
1124 }
1125 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1126 return chars;
1127 }
1128
1129 static void mos7720_close(struct usb_serial_port *port)
1130 {
1131 struct usb_serial *serial;
1132 struct moschip_port *mos7720_port;
1133 int j;
1134
1135 serial = port->serial;
1136
1137 mos7720_port = usb_get_serial_port_data(port);
1138 if (mos7720_port == NULL)
1139 return;
1140
1141 for (j = 0; j < NUM_URBS; ++j)
1142 usb_kill_urb(mos7720_port->write_urb_pool[j]);
1143
1144 /* Freeing Write URBs */
1145 for (j = 0; j < NUM_URBS; ++j) {
1146 if (mos7720_port->write_urb_pool[j]) {
1147 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer);
1148 usb_free_urb(mos7720_port->write_urb_pool[j]);
1149 }
1150 }
1151
1152 /* While closing port, shutdown all bulk read, write *
1153 * and interrupt read if they exists, otherwise nop */
1154 usb_kill_urb(port->write_urb);
1155 usb_kill_urb(port->read_urb);
1156
1157 write_mos_reg(serial, port->port_number, MCR, 0x00);
1158 write_mos_reg(serial, port->port_number, IER, 0x00);
1159
1160 mos7720_port->open = 0;
1161 }
1162
1163 static void mos7720_break(struct tty_struct *tty, int break_state)
1164 {
1165 struct usb_serial_port *port = tty->driver_data;
1166 unsigned char data;
1167 struct usb_serial *serial;
1168 struct moschip_port *mos7720_port;
1169
1170 serial = port->serial;
1171
1172 mos7720_port = usb_get_serial_port_data(port);
1173 if (mos7720_port == NULL)
1174 return;
1175
1176 if (break_state == -1)
1177 data = mos7720_port->shadowLCR | UART_LCR_SBC;
1178 else
1179 data = mos7720_port->shadowLCR & ~UART_LCR_SBC;
1180
1181 mos7720_port->shadowLCR = data;
1182 write_mos_reg(serial, port->port_number, LCR, mos7720_port->shadowLCR);
1183 }
1184
1185 /*
1186 * mos7720_write_room
1187 * this function is called by the tty driver when it wants to know how many
1188 * bytes of data we can accept for a specific port.
1189 * If successful, we return the amount of room that we have for this port
1190 * Otherwise we return a negative error number.
1191 */
1192 static int mos7720_write_room(struct tty_struct *tty)
1193 {
1194 struct usb_serial_port *port = tty->driver_data;
1195 struct moschip_port *mos7720_port;
1196 int room = 0;
1197 int i;
1198
1199 mos7720_port = usb_get_serial_port_data(port);
1200 if (mos7720_port == NULL)
1201 return -ENODEV;
1202
1203 /* FIXME: Locking */
1204 for (i = 0; i < NUM_URBS; ++i) {
1205 if (mos7720_port->write_urb_pool[i] &&
1206 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS)
1207 room += URB_TRANSFER_BUFFER_SIZE;
1208 }
1209
1210 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
1211 return room;
1212 }
1213
1214 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port,
1215 const unsigned char *data, int count)
1216 {
1217 int status;
1218 int i;
1219 int bytes_sent = 0;
1220 int transfer_size;
1221
1222 struct moschip_port *mos7720_port;
1223 struct usb_serial *serial;
1224 struct urb *urb;
1225 const unsigned char *current_position = data;
1226
1227 serial = port->serial;
1228
1229 mos7720_port = usb_get_serial_port_data(port);
1230 if (mos7720_port == NULL)
1231 return -ENODEV;
1232
1233 /* try to find a free urb in the list */
1234 urb = NULL;
1235
1236 for (i = 0; i < NUM_URBS; ++i) {
1237 if (mos7720_port->write_urb_pool[i] &&
1238 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) {
1239 urb = mos7720_port->write_urb_pool[i];
1240 dev_dbg(&port->dev, "URB:%d\n", i);
1241 break;
1242 }
1243 }
1244
1245 if (urb == NULL) {
1246 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1247 goto exit;
1248 }
1249
1250 if (urb->transfer_buffer == NULL) {
1251 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1252 GFP_KERNEL);
1253 if (urb->transfer_buffer == NULL) {
1254 dev_err_console(port, "%s no more kernel memory...\n",
1255 __func__);
1256 goto exit;
1257 }
1258 }
1259 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1260
1261 memcpy(urb->transfer_buffer, current_position, transfer_size);
1262 usb_serial_debug_data(&port->dev, __func__, transfer_size,
1263 urb->transfer_buffer);
1264
1265 /* fill urb with data and submit */
1266 usb_fill_bulk_urb(urb, serial->dev,
1267 usb_sndbulkpipe(serial->dev,
1268 port->bulk_out_endpointAddress),
1269 urb->transfer_buffer, transfer_size,
1270 mos7720_bulk_out_data_callback, mos7720_port);
1271
1272 /* send it down the pipe */
1273 status = usb_submit_urb(urb, GFP_ATOMIC);
1274 if (status) {
1275 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1276 "with status = %d\n", __func__, status);
1277 bytes_sent = status;
1278 goto exit;
1279 }
1280 bytes_sent = transfer_size;
1281
1282 exit:
1283 return bytes_sent;
1284 }
1285
1286 static void mos7720_throttle(struct tty_struct *tty)
1287 {
1288 struct usb_serial_port *port = tty->driver_data;
1289 struct moschip_port *mos7720_port;
1290 int status;
1291
1292 mos7720_port = usb_get_serial_port_data(port);
1293
1294 if (mos7720_port == NULL)
1295 return;
1296
1297 if (!mos7720_port->open) {
1298 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1299 return;
1300 }
1301
1302 /* if we are implementing XON/XOFF, send the stop character */
1303 if (I_IXOFF(tty)) {
1304 unsigned char stop_char = STOP_CHAR(tty);
1305 status = mos7720_write(tty, port, &stop_char, 1);
1306 if (status <= 0)
1307 return;
1308 }
1309
1310 /* if we are implementing RTS/CTS, toggle that line */
1311 if (tty->termios.c_cflag & CRTSCTS) {
1312 mos7720_port->shadowMCR &= ~UART_MCR_RTS;
1313 write_mos_reg(port->serial, port->port_number, MCR,
1314 mos7720_port->shadowMCR);
1315 if (status != 0)
1316 return;
1317 }
1318 }
1319
1320 static void mos7720_unthrottle(struct tty_struct *tty)
1321 {
1322 struct usb_serial_port *port = tty->driver_data;
1323 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1324 int status;
1325
1326 if (mos7720_port == NULL)
1327 return;
1328
1329 if (!mos7720_port->open) {
1330 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1331 return;
1332 }
1333
1334 /* if we are implementing XON/XOFF, send the start character */
1335 if (I_IXOFF(tty)) {
1336 unsigned char start_char = START_CHAR(tty);
1337 status = mos7720_write(tty, port, &start_char, 1);
1338 if (status <= 0)
1339 return;
1340 }
1341
1342 /* if we are implementing RTS/CTS, toggle that line */
1343 if (tty->termios.c_cflag & CRTSCTS) {
1344 mos7720_port->shadowMCR |= UART_MCR_RTS;
1345 write_mos_reg(port->serial, port->port_number, MCR,
1346 mos7720_port->shadowMCR);
1347 if (status != 0)
1348 return;
1349 }
1350 }
1351
1352 /* FIXME: this function does not work */
1353 static int set_higher_rates(struct moschip_port *mos7720_port,
1354 unsigned int baud)
1355 {
1356 struct usb_serial_port *port;
1357 struct usb_serial *serial;
1358 int port_number;
1359 enum mos_regs sp_reg;
1360 if (mos7720_port == NULL)
1361 return -EINVAL;
1362
1363 port = mos7720_port->port;
1364 serial = port->serial;
1365
1366 /***********************************************
1367 * Init Sequence for higher rates
1368 ***********************************************/
1369 dev_dbg(&port->dev, "Sending Setting Commands ..........\n");
1370 port_number = port->port_number;
1371
1372 write_mos_reg(serial, port_number, IER, 0x00);
1373 write_mos_reg(serial, port_number, FCR, 0x00);
1374 write_mos_reg(serial, port_number, FCR, 0xcf);
1375 mos7720_port->shadowMCR = 0x0b;
1376 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1377 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x00);
1378
1379 /***********************************************
1380 * Set for higher rates *
1381 ***********************************************/
1382 /* writing baud rate verbatum into uart clock field clearly not right */
1383 if (port_number == 0)
1384 sp_reg = SP1_REG;
1385 else
1386 sp_reg = SP2_REG;
1387 write_mos_reg(serial, dummy, sp_reg, baud * 0x10);
1388 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x03);
1389 mos7720_port->shadowMCR = 0x2b;
1390 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1391
1392 /***********************************************
1393 * Set DLL/DLM
1394 ***********************************************/
1395 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1396 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1397 write_mos_reg(serial, port_number, DLL, 0x01);
1398 write_mos_reg(serial, port_number, DLM, 0x00);
1399 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1400 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1401
1402 return 0;
1403 }
1404
1405 /* baud rate information */
1406 struct divisor_table_entry {
1407 __u32 baudrate;
1408 __u16 divisor;
1409 };
1410
1411 /* Define table of divisors for moschip 7720 hardware *
1412 * These assume a 3.6864MHz crystal, the standard /16, and *
1413 * MCR.7 = 0. */
1414 static struct divisor_table_entry divisor_table[] = {
1415 { 50, 2304},
1416 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */
1417 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */
1418 { 150, 768},
1419 { 300, 384},
1420 { 600, 192},
1421 { 1200, 96},
1422 { 1800, 64},
1423 { 2400, 48},
1424 { 4800, 24},
1425 { 7200, 16},
1426 { 9600, 12},
1427 { 19200, 6},
1428 { 38400, 3},
1429 { 57600, 2},
1430 { 115200, 1},
1431 };
1432
1433 /*****************************************************************************
1434 * calc_baud_rate_divisor
1435 * this function calculates the proper baud rate divisor for the specified
1436 * baud rate.
1437 *****************************************************************************/
1438 static int calc_baud_rate_divisor(struct usb_serial_port *port, int baudrate, int *divisor)
1439 {
1440 int i;
1441 __u16 custom;
1442 __u16 round1;
1443 __u16 round;
1444
1445
1446 dev_dbg(&port->dev, "%s - %d\n", __func__, baudrate);
1447
1448 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) {
1449 if (divisor_table[i].baudrate == baudrate) {
1450 *divisor = divisor_table[i].divisor;
1451 return 0;
1452 }
1453 }
1454
1455 /* After trying for all the standard baud rates *
1456 * Try calculating the divisor for this baud rate */
1457 if (baudrate > 75 && baudrate < 230400) {
1458 /* get the divisor */
1459 custom = (__u16)(230400L / baudrate);
1460
1461 /* Check for round off */
1462 round1 = (__u16)(2304000L / baudrate);
1463 round = (__u16)(round1 - (custom * 10));
1464 if (round > 4)
1465 custom++;
1466 *divisor = custom;
1467
1468 dev_dbg(&port->dev, "Baud %d = %d\n", baudrate, custom);
1469 return 0;
1470 }
1471
1472 dev_dbg(&port->dev, "Baud calculation Failed...\n");
1473 return -EINVAL;
1474 }
1475
1476 /*
1477 * send_cmd_write_baud_rate
1478 * this function sends the proper command to change the baud rate of the
1479 * specified port.
1480 */
1481 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port,
1482 int baudrate)
1483 {
1484 struct usb_serial_port *port;
1485 struct usb_serial *serial;
1486 int divisor;
1487 int status;
1488 unsigned char number;
1489
1490 if (mos7720_port == NULL)
1491 return -1;
1492
1493 port = mos7720_port->port;
1494 serial = port->serial;
1495
1496 number = port->port_number;
1497 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudrate);
1498
1499 /* Calculate the Divisor */
1500 status = calc_baud_rate_divisor(port, baudrate, &divisor);
1501 if (status) {
1502 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1503 return status;
1504 }
1505
1506 /* Enable access to divisor latch */
1507 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1508 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR);
1509
1510 /* Write the divisor */
1511 write_mos_reg(serial, number, DLL, (__u8)(divisor & 0xff));
1512 write_mos_reg(serial, number, DLM, (__u8)((divisor & 0xff00) >> 8));
1513
1514 /* Disable access to divisor latch */
1515 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1516 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR);
1517
1518 return status;
1519 }
1520
1521 /*
1522 * change_port_settings
1523 * This routine is called to set the UART on the device to match
1524 * the specified new settings.
1525 */
1526 static void change_port_settings(struct tty_struct *tty,
1527 struct moschip_port *mos7720_port,
1528 struct ktermios *old_termios)
1529 {
1530 struct usb_serial_port *port;
1531 struct usb_serial *serial;
1532 int baud;
1533 unsigned cflag;
1534 unsigned iflag;
1535 __u8 mask = 0xff;
1536 __u8 lData;
1537 __u8 lParity;
1538 __u8 lStop;
1539 int status;
1540 int port_number;
1541
1542 if (mos7720_port == NULL)
1543 return ;
1544
1545 port = mos7720_port->port;
1546 serial = port->serial;
1547 port_number = port->port_number;
1548
1549 if (!mos7720_port->open) {
1550 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1551 return;
1552 }
1553
1554 lData = UART_LCR_WLEN8;
1555 lStop = 0x00; /* 1 stop bit */
1556 lParity = 0x00; /* No parity */
1557
1558 cflag = tty->termios.c_cflag;
1559 iflag = tty->termios.c_iflag;
1560
1561 /* Change the number of bits */
1562 switch (cflag & CSIZE) {
1563 case CS5:
1564 lData = UART_LCR_WLEN5;
1565 mask = 0x1f;
1566 break;
1567
1568 case CS6:
1569 lData = UART_LCR_WLEN6;
1570 mask = 0x3f;
1571 break;
1572
1573 case CS7:
1574 lData = UART_LCR_WLEN7;
1575 mask = 0x7f;
1576 break;
1577 default:
1578 case CS8:
1579 lData = UART_LCR_WLEN8;
1580 break;
1581 }
1582
1583 /* Change the Parity bit */
1584 if (cflag & PARENB) {
1585 if (cflag & PARODD) {
1586 lParity = UART_LCR_PARITY;
1587 dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1588 } else {
1589 lParity = (UART_LCR_EPAR | UART_LCR_PARITY);
1590 dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1591 }
1592
1593 } else {
1594 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1595 }
1596
1597 if (cflag & CMSPAR)
1598 lParity = lParity | 0x20;
1599
1600 /* Change the Stop bit */
1601 if (cflag & CSTOPB) {
1602 lStop = UART_LCR_STOP;
1603 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1604 } else {
1605 lStop = 0x00;
1606 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1607 }
1608
1609 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
1610 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
1611 #define LCR_PAR_MASK 0x38 /* Mask for parity field */
1612
1613 /* Update the LCR with the correct value */
1614 mos7720_port->shadowLCR &=
1615 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1616 mos7720_port->shadowLCR |= (lData | lParity | lStop);
1617
1618
1619 /* Disable Interrupts */
1620 write_mos_reg(serial, port_number, IER, 0x00);
1621 write_mos_reg(serial, port_number, FCR, 0x00);
1622 write_mos_reg(serial, port_number, FCR, 0xcf);
1623
1624 /* Send the updated LCR value to the mos7720 */
1625 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1626 mos7720_port->shadowMCR = 0x0b;
1627 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1628
1629 /* set up the MCR register and send it to the mos7720 */
1630 mos7720_port->shadowMCR = UART_MCR_OUT2;
1631 if (cflag & CBAUD)
1632 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS);
1633
1634 if (cflag & CRTSCTS) {
1635 mos7720_port->shadowMCR |= (UART_MCR_XONANY);
1636 /* To set hardware flow control to the specified *
1637 * serial port, in SP1/2_CONTROL_REG */
1638 if (port_number)
1639 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x01);
1640 else
1641 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x02);
1642
1643 } else
1644 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY);
1645
1646 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1647
1648 /* Determine divisor based on baud rate */
1649 baud = tty_get_baud_rate(tty);
1650 if (!baud) {
1651 /* pick a default, any default... */
1652 dev_dbg(&port->dev, "Picked default baud...\n");
1653 baud = 9600;
1654 }
1655
1656 if (baud >= 230400) {
1657 set_higher_rates(mos7720_port, baud);
1658 /* Enable Interrupts */
1659 write_mos_reg(serial, port_number, IER, 0x0c);
1660 return;
1661 }
1662
1663 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1664 status = send_cmd_write_baud_rate(mos7720_port, baud);
1665 /* FIXME: needs to write actual resulting baud back not just
1666 blindly do so */
1667 if (cflag & CBAUD)
1668 tty_encode_baud_rate(tty, baud, baud);
1669 /* Enable Interrupts */
1670 write_mos_reg(serial, port_number, IER, 0x0c);
1671
1672 if (port->read_urb->status != -EINPROGRESS) {
1673 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1674 if (status)
1675 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status);
1676 }
1677 }
1678
1679 /*
1680 * mos7720_set_termios
1681 * this function is called by the tty driver when it wants to change the
1682 * termios structure.
1683 */
1684 static void mos7720_set_termios(struct tty_struct *tty,
1685 struct usb_serial_port *port, struct ktermios *old_termios)
1686 {
1687 int status;
1688 unsigned int cflag;
1689 struct usb_serial *serial;
1690 struct moschip_port *mos7720_port;
1691
1692 serial = port->serial;
1693
1694 mos7720_port = usb_get_serial_port_data(port);
1695
1696 if (mos7720_port == NULL)
1697 return;
1698
1699 if (!mos7720_port->open) {
1700 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1701 return;
1702 }
1703
1704 dev_dbg(&port->dev, "setting termios - ASPIRE\n");
1705
1706 cflag = tty->termios.c_cflag;
1707
1708 dev_dbg(&port->dev, "%s - cflag %08x iflag %08x\n", __func__,
1709 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
1710
1711 dev_dbg(&port->dev, "%s - old cflag %08x old iflag %08x\n", __func__,
1712 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
1713
1714 /* change the port settings to the new ones specified */
1715 change_port_settings(tty, mos7720_port, old_termios);
1716
1717 if (port->read_urb->status != -EINPROGRESS) {
1718 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1719 if (status)
1720 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status);
1721 }
1722 }
1723
1724 /*
1725 * get_lsr_info - get line status register info
1726 *
1727 * Purpose: Let user call ioctl() to get info when the UART physically
1728 * is emptied. On bus types like RS485, the transmitter must
1729 * release the bus after transmitting. This must be done when
1730 * the transmit shift register is empty, not be done when the
1731 * transmit holding register is empty. This functionality
1732 * allows an RS485 driver to be written in user space.
1733 */
1734 static int get_lsr_info(struct tty_struct *tty,
1735 struct moschip_port *mos7720_port, unsigned int __user *value)
1736 {
1737 struct usb_serial_port *port = tty->driver_data;
1738 unsigned int result = 0;
1739 unsigned char data = 0;
1740 int port_number = port->port_number;
1741 int count;
1742
1743 count = mos7720_chars_in_buffer(tty);
1744 if (count == 0) {
1745 read_mos_reg(port->serial, port_number, LSR, &data);
1746 if ((data & (UART_LSR_TEMT | UART_LSR_THRE))
1747 == (UART_LSR_TEMT | UART_LSR_THRE)) {
1748 dev_dbg(&port->dev, "%s -- Empty\n", __func__);
1749 result = TIOCSER_TEMT;
1750 }
1751 }
1752 if (copy_to_user(value, &result, sizeof(int)))
1753 return -EFAULT;
1754 return 0;
1755 }
1756
1757 static int mos7720_tiocmget(struct tty_struct *tty)
1758 {
1759 struct usb_serial_port *port = tty->driver_data;
1760 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1761 unsigned int result = 0;
1762 unsigned int mcr ;
1763 unsigned int msr ;
1764
1765 mcr = mos7720_port->shadowMCR;
1766 msr = mos7720_port->shadowMSR;
1767
1768 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */
1769 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */
1770 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */
1771 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */
1772 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */
1773 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
1774
1775 return result;
1776 }
1777
1778 static int mos7720_tiocmset(struct tty_struct *tty,
1779 unsigned int set, unsigned int clear)
1780 {
1781 struct usb_serial_port *port = tty->driver_data;
1782 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1783 unsigned int mcr ;
1784
1785 mcr = mos7720_port->shadowMCR;
1786
1787 if (set & TIOCM_RTS)
1788 mcr |= UART_MCR_RTS;
1789 if (set & TIOCM_DTR)
1790 mcr |= UART_MCR_DTR;
1791 if (set & TIOCM_LOOP)
1792 mcr |= UART_MCR_LOOP;
1793
1794 if (clear & TIOCM_RTS)
1795 mcr &= ~UART_MCR_RTS;
1796 if (clear & TIOCM_DTR)
1797 mcr &= ~UART_MCR_DTR;
1798 if (clear & TIOCM_LOOP)
1799 mcr &= ~UART_MCR_LOOP;
1800
1801 mos7720_port->shadowMCR = mcr;
1802 write_mos_reg(port->serial, port->port_number, MCR,
1803 mos7720_port->shadowMCR);
1804
1805 return 0;
1806 }
1807
1808 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd,
1809 unsigned int __user *value)
1810 {
1811 unsigned int mcr;
1812 unsigned int arg;
1813
1814 struct usb_serial_port *port;
1815
1816 if (mos7720_port == NULL)
1817 return -1;
1818
1819 port = (struct usb_serial_port *)mos7720_port->port;
1820 mcr = mos7720_port->shadowMCR;
1821
1822 if (copy_from_user(&arg, value, sizeof(int)))
1823 return -EFAULT;
1824
1825 switch (cmd) {
1826 case TIOCMBIS:
1827 if (arg & TIOCM_RTS)
1828 mcr |= UART_MCR_RTS;
1829 if (arg & TIOCM_DTR)
1830 mcr |= UART_MCR_RTS;
1831 if (arg & TIOCM_LOOP)
1832 mcr |= UART_MCR_LOOP;
1833 break;
1834
1835 case TIOCMBIC:
1836 if (arg & TIOCM_RTS)
1837 mcr &= ~UART_MCR_RTS;
1838 if (arg & TIOCM_DTR)
1839 mcr &= ~UART_MCR_RTS;
1840 if (arg & TIOCM_LOOP)
1841 mcr &= ~UART_MCR_LOOP;
1842 break;
1843
1844 }
1845
1846 mos7720_port->shadowMCR = mcr;
1847 write_mos_reg(port->serial, port->port_number, MCR,
1848 mos7720_port->shadowMCR);
1849
1850 return 0;
1851 }
1852
1853 static int get_serial_info(struct moschip_port *mos7720_port,
1854 struct serial_struct __user *retinfo)
1855 {
1856 struct serial_struct tmp;
1857
1858 if (!retinfo)
1859 return -EFAULT;
1860
1861 memset(&tmp, 0, sizeof(tmp));
1862
1863 tmp.type = PORT_16550A;
1864 tmp.line = mos7720_port->port->minor;
1865 tmp.port = mos7720_port->port->port_number;
1866 tmp.irq = 0;
1867 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
1868 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1869 tmp.baud_base = 9600;
1870 tmp.close_delay = 5*HZ;
1871 tmp.closing_wait = 30*HZ;
1872
1873 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1874 return -EFAULT;
1875 return 0;
1876 }
1877
1878 static int mos7720_ioctl(struct tty_struct *tty,
1879 unsigned int cmd, unsigned long arg)
1880 {
1881 struct usb_serial_port *port = tty->driver_data;
1882 struct moschip_port *mos7720_port;
1883
1884 mos7720_port = usb_get_serial_port_data(port);
1885 if (mos7720_port == NULL)
1886 return -ENODEV;
1887
1888 dev_dbg(&port->dev, "%s - cmd = 0x%x", __func__, cmd);
1889
1890 switch (cmd) {
1891 case TIOCSERGETLSR:
1892 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
1893 return get_lsr_info(tty, mos7720_port,
1894 (unsigned int __user *)arg);
1895
1896 /* FIXME: These should be using the mode methods */
1897 case TIOCMBIS:
1898 case TIOCMBIC:
1899 dev_dbg(&port->dev, "%s TIOCMSET/TIOCMBIC/TIOCMSET\n", __func__);
1900 return set_modem_info(mos7720_port, cmd,
1901 (unsigned int __user *)arg);
1902
1903 case TIOCGSERIAL:
1904 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
1905 return get_serial_info(mos7720_port,
1906 (struct serial_struct __user *)arg);
1907 }
1908
1909 return -ENOIOCTLCMD;
1910 }
1911
1912 static int mos7720_startup(struct usb_serial *serial)
1913 {
1914 struct usb_device *dev;
1915 char data;
1916 u16 product;
1917 int ret_val;
1918
1919 product = le16_to_cpu(serial->dev->descriptor.idProduct);
1920 dev = serial->dev;
1921
1922 /*
1923 * The 7715 uses the first bulk in/out endpoint pair for the parallel
1924 * port, and the second for the serial port. Because the usbserial core
1925 * assumes both pairs are serial ports, we must engage in a bit of
1926 * subterfuge and swap the pointers for ports 0 and 1 in order to make
1927 * port 0 point to the serial port. However, both moschip devices use a
1928 * single interrupt-in endpoint for both ports (as mentioned a little
1929 * further down), and this endpoint was assigned to port 0. So after
1930 * the swap, we must copy the interrupt endpoint elements from port 1
1931 * (as newly assigned) to port 0, and null out port 1 pointers.
1932 */
1933 if (product == MOSCHIP_DEVICE_ID_7715) {
1934 struct usb_serial_port *tmp = serial->port[0];
1935 serial->port[0] = serial->port[1];
1936 serial->port[1] = tmp;
1937 serial->port[0]->interrupt_in_urb = tmp->interrupt_in_urb;
1938 serial->port[0]->interrupt_in_buffer = tmp->interrupt_in_buffer;
1939 serial->port[0]->interrupt_in_endpointAddress =
1940 tmp->interrupt_in_endpointAddress;
1941 serial->port[1]->interrupt_in_urb = NULL;
1942 serial->port[1]->interrupt_in_buffer = NULL;
1943 }
1944
1945 /* setting configuration feature to one */
1946 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1947 (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5000);
1948
1949 /* start the interrupt urb */
1950 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL);
1951 if (ret_val)
1952 dev_err(&dev->dev,
1953 "%s - Error %d submitting control urb\n",
1954 __func__, ret_val);
1955
1956 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
1957 if (product == MOSCHIP_DEVICE_ID_7715) {
1958 ret_val = mos7715_parport_init(serial);
1959 if (ret_val < 0)
1960 return ret_val;
1961 }
1962 #endif
1963 /* LSR For Port 1 */
1964 read_mos_reg(serial, 0, LSR, &data);
1965 dev_dbg(&dev->dev, "LSR:%x\n", data);
1966
1967 return 0;
1968 }
1969
1970 static void mos7720_release(struct usb_serial *serial)
1971 {
1972 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
1973 /* close the parallel port */
1974
1975 if (le16_to_cpu(serial->dev->descriptor.idProduct)
1976 == MOSCHIP_DEVICE_ID_7715) {
1977 struct urbtracker *urbtrack;
1978 unsigned long flags;
1979 struct mos7715_parport *mos_parport =
1980 usb_get_serial_data(serial);
1981
1982 /* prevent NULL ptr dereference in port callbacks */
1983 spin_lock(&release_lock);
1984 mos_parport->pp->private_data = NULL;
1985 spin_unlock(&release_lock);
1986
1987 /* wait for synchronous usb calls to return */
1988 if (mos_parport->msg_pending)
1989 wait_for_completion_timeout(&mos_parport->syncmsg_compl,
1990 msecs_to_jiffies(MOS_WDR_TIMEOUT));
1991
1992 parport_remove_port(mos_parport->pp);
1993 usb_set_serial_data(serial, NULL);
1994 mos_parport->serial = NULL;
1995
1996 /* if tasklet currently scheduled, wait for it to complete */
1997 tasklet_kill(&mos_parport->urb_tasklet);
1998
1999 /* unlink any urbs sent by the tasklet */
2000 spin_lock_irqsave(&mos_parport->listlock, flags);
2001 list_for_each_entry(urbtrack,
2002 &mos_parport->active_urbs,
2003 urblist_entry)
2004 usb_unlink_urb(urbtrack->urb);
2005 spin_unlock_irqrestore(&mos_parport->listlock, flags);
2006
2007 kref_put(&mos_parport->ref_count, destroy_mos_parport);
2008 }
2009 #endif
2010 }
2011
2012 static int mos7720_port_probe(struct usb_serial_port *port)
2013 {
2014 struct moschip_port *mos7720_port;
2015
2016 mos7720_port = kzalloc(sizeof(*mos7720_port), GFP_KERNEL);
2017 if (!mos7720_port)
2018 return -ENOMEM;
2019
2020 /* Initialize all port interrupt end point to port 0 int endpoint.
2021 * Our device has only one interrupt endpoint common to all ports.
2022 */
2023 port->interrupt_in_endpointAddress =
2024 port->serial->port[0]->interrupt_in_endpointAddress;
2025 mos7720_port->port = port;
2026
2027 usb_set_serial_port_data(port, mos7720_port);
2028
2029 return 0;
2030 }
2031
2032 static int mos7720_port_remove(struct usb_serial_port *port)
2033 {
2034 struct moschip_port *mos7720_port;
2035
2036 mos7720_port = usb_get_serial_port_data(port);
2037 kfree(mos7720_port);
2038
2039 return 0;
2040 }
2041
2042 static struct usb_serial_driver moschip7720_2port_driver = {
2043 .driver = {
2044 .owner = THIS_MODULE,
2045 .name = "moschip7720",
2046 },
2047 .description = "Moschip 2 port adapter",
2048 .id_table = id_table,
2049 .calc_num_ports = mos77xx_calc_num_ports,
2050 .open = mos7720_open,
2051 .close = mos7720_close,
2052 .throttle = mos7720_throttle,
2053 .unthrottle = mos7720_unthrottle,
2054 .probe = mos77xx_probe,
2055 .attach = mos7720_startup,
2056 .release = mos7720_release,
2057 .port_probe = mos7720_port_probe,
2058 .port_remove = mos7720_port_remove,
2059 .ioctl = mos7720_ioctl,
2060 .tiocmget = mos7720_tiocmget,
2061 .tiocmset = mos7720_tiocmset,
2062 .set_termios = mos7720_set_termios,
2063 .write = mos7720_write,
2064 .write_room = mos7720_write_room,
2065 .chars_in_buffer = mos7720_chars_in_buffer,
2066 .break_ctl = mos7720_break,
2067 .read_bulk_callback = mos7720_bulk_in_callback,
2068 .read_int_callback = NULL /* dynamically assigned in probe() */
2069 };
2070
2071 static struct usb_serial_driver * const serial_drivers[] = {
2072 &moschip7720_2port_driver, NULL
2073 };
2074
2075 module_usb_serial_driver(serial_drivers, id_table);
2076
2077 MODULE_AUTHOR(DRIVER_AUTHOR);
2078 MODULE_DESCRIPTION(DRIVER_DESC);
2079 MODULE_LICENSE("GPL");
Linux with added FPC-III support