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pty: Repair TIOCGPTPEER
[cris-mirror.git] / drivers / usb / serial / mos7720.c
bloba453965f9e9a3153ffcbb28d4a6257a4db094cd3
1 /*
2 * mos7720.c
3 * Controls the Moschip 7720 usb to dual port serial converter
4 *
5 * Copyright 2006 Moschip Semiconductor Tech. Ltd.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, version 2 of the License.
10 *
11 * Developed by:
12 * Vijaya Kumar <vijaykumar.gn@gmail.com>
13 * Ajay Kumar <naanuajay@yahoo.com>
14 * Gurudeva <ngurudeva@yahoo.com>
15 *
16 * Cleaned up from the original by:
17 * Greg Kroah-Hartman <gregkh@suse.de>
18 *
19 * Originally based on drivers/usb/serial/io_edgeport.c which is:
20 * Copyright (C) 2000 Inside Out Networks, All rights reserved.
21 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
22 */
23 #include <linux/kernel.h>
24 #include <linux/errno.h>
25 #include <linux/slab.h>
26 #include <linux/tty.h>
27 #include <linux/tty_driver.h>
28 #include <linux/tty_flip.h>
29 #include <linux/module.h>
30 #include <linux/spinlock.h>
31 #include <linux/serial.h>
32 #include <linux/serial_reg.h>
33 #include <linux/usb.h>
34 #include <linux/usb/serial.h>
35 #include <linux/uaccess.h>
36 #include <linux/parport.h>
37
38 #define DRIVER_AUTHOR "Aspire Communications pvt Ltd."
39 #define DRIVER_DESC "Moschip USB Serial Driver"
40
41 /* default urb timeout */
42 #define MOS_WDR_TIMEOUT 5000
43
44 #define MOS_MAX_PORT 0x02
45 #define MOS_WRITE 0x0E
46 #define MOS_READ 0x0D
47
48 /* Interrupt Routines Defines */
49 #define SERIAL_IIR_RLS 0x06
50 #define SERIAL_IIR_RDA 0x04
51 #define SERIAL_IIR_CTI 0x0c
52 #define SERIAL_IIR_THR 0x02
53 #define SERIAL_IIR_MS 0x00
54
55 #define NUM_URBS 16 /* URB Count */
56 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
57
58 /* This structure holds all of the local serial port information */
59 struct moschip_port {
60 __u8 shadowLCR; /* last LCR value received */
61 __u8 shadowMCR; /* last MCR value received */
62 __u8 shadowMSR; /* last MSR value received */
63 char open;
64 struct usb_serial_port *port; /* loop back to the owner */
65 struct urb *write_urb_pool[NUM_URBS];
66 };
67
68 #define USB_VENDOR_ID_MOSCHIP 0x9710
69 #define MOSCHIP_DEVICE_ID_7720 0x7720
70 #define MOSCHIP_DEVICE_ID_7715 0x7715
71
72 static const struct usb_device_id id_table[] = {
73 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7720) },
74 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7715) },
75 { } /* terminating entry */
76 };
77 MODULE_DEVICE_TABLE(usb, id_table);
78
79 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
80
81 /* initial values for parport regs */
82 #define DCR_INIT_VAL 0x0c /* SLCTIN, nINIT */
83 #define ECR_INIT_VAL 0x00 /* SPP mode */
84
85 struct urbtracker {
86 struct mos7715_parport *mos_parport;
87 struct list_head urblist_entry;
88 struct kref ref_count;
89 struct urb *urb;
90 struct usb_ctrlrequest *setup;
91 };
92
93 enum mos7715_pp_modes {
94 SPP = 0<<5,
95 PS2 = 1<<5, /* moschip calls this 'NIBBLE' mode */
96 PPF = 2<<5, /* moschip calls this 'CB-FIFO mode */
97 };
98
99 struct mos7715_parport {
100 struct parport *pp; /* back to containing struct */
101 struct kref ref_count; /* to instance of this struct */
102 struct list_head deferred_urbs; /* list deferred async urbs */
103 struct list_head active_urbs; /* list async urbs in flight */
104 spinlock_t listlock; /* protects list access */
105 bool msg_pending; /* usb sync call pending */
106 struct completion syncmsg_compl; /* usb sync call completed */
107 struct tasklet_struct urb_tasklet; /* for sending deferred urbs */
108 struct usb_serial *serial; /* back to containing struct */
109 __u8 shadowECR; /* parallel port regs... */
110 __u8 shadowDCR;
111 atomic_t shadowDSR; /* updated in int-in callback */
112 };
113
114 /* lock guards against dereferencing NULL ptr in parport ops callbacks */
115 static DEFINE_SPINLOCK(release_lock);
116
117 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
118
119 static const unsigned int dummy; /* for clarity in register access fns */
120
121 enum mos_regs {
122 MOS7720_THR, /* serial port regs */
123 MOS7720_RHR,
124 MOS7720_IER,
125 MOS7720_FCR,
126 MOS7720_ISR,
127 MOS7720_LCR,
128 MOS7720_MCR,
129 MOS7720_LSR,
130 MOS7720_MSR,
131 MOS7720_SPR,
132 MOS7720_DLL,
133 MOS7720_DLM,
134 MOS7720_DPR, /* parallel port regs */
135 MOS7720_DSR,
136 MOS7720_DCR,
137 MOS7720_ECR,
138 MOS7720_SP1_REG, /* device control regs */
139 MOS7720_SP2_REG, /* serial port 2 (7720 only) */
140 MOS7720_PP_REG,
141 MOS7720_SP_CONTROL_REG,
142 };
143
144 /*
145 * Return the correct value for the Windex field of the setup packet
146 * for a control endpoint message. See the 7715 datasheet.
147 */
148 static inline __u16 get_reg_index(enum mos_regs reg)
149 {
150 static const __u16 mos7715_index_lookup_table[] = {
151 0x00, /* MOS7720_THR */
152 0x00, /* MOS7720_RHR */
153 0x01, /* MOS7720_IER */
154 0x02, /* MOS7720_FCR */
155 0x02, /* MOS7720_ISR */
156 0x03, /* MOS7720_LCR */
157 0x04, /* MOS7720_MCR */
158 0x05, /* MOS7720_LSR */
159 0x06, /* MOS7720_MSR */
160 0x07, /* MOS7720_SPR */
161 0x00, /* MOS7720_DLL */
162 0x01, /* MOS7720_DLM */
163 0x00, /* MOS7720_DPR */
164 0x01, /* MOS7720_DSR */
165 0x02, /* MOS7720_DCR */
166 0x0a, /* MOS7720_ECR */
167 0x01, /* MOS7720_SP1_REG */
168 0x02, /* MOS7720_SP2_REG (7720 only) */
169 0x04, /* MOS7720_PP_REG (7715 only) */
170 0x08, /* MOS7720_SP_CONTROL_REG */
171 };
172 return mos7715_index_lookup_table[reg];
173 }
174
175 /*
176 * Return the correct value for the upper byte of the Wvalue field of
177 * the setup packet for a control endpoint message.
178 */
179 static inline __u16 get_reg_value(enum mos_regs reg,
180 unsigned int serial_portnum)
181 {
182 if (reg >= MOS7720_SP1_REG) /* control reg */
183 return 0x0000;
184
185 else if (reg >= MOS7720_DPR) /* parallel port reg (7715 only) */
186 return 0x0100;
187
188 else /* serial port reg */
189 return (serial_portnum + 2) << 8;
190 }
191
192 /*
193 * Write data byte to the specified device register. The data is embedded in
194 * the value field of the setup packet. serial_portnum is ignored for registers
195 * not specific to a particular serial port.
196 */
197 static int write_mos_reg(struct usb_serial *serial, unsigned int serial_portnum,
198 enum mos_regs reg, __u8 data)
199 {
200 struct usb_device *usbdev = serial->dev;
201 unsigned int pipe = usb_sndctrlpipe(usbdev, 0);
202 __u8 request = (__u8)0x0e;
203 __u8 requesttype = (__u8)0x40;
204 __u16 index = get_reg_index(reg);
205 __u16 value = get_reg_value(reg, serial_portnum) + data;
206 int status = usb_control_msg(usbdev, pipe, request, requesttype, value,
207 index, NULL, 0, MOS_WDR_TIMEOUT);
208 if (status < 0)
209 dev_err(&usbdev->dev,
210 "mos7720: usb_control_msg() failed: %d\n", status);
211 return status;
212 }
213
214 /*
215 * Read data byte from the specified device register. The data returned by the
216 * device is embedded in the value field of the setup packet. serial_portnum is
217 * ignored for registers that are not specific to a particular serial port.
218 */
219 static int read_mos_reg(struct usb_serial *serial, unsigned int serial_portnum,
220 enum mos_regs reg, __u8 *data)
221 {
222 struct usb_device *usbdev = serial->dev;
223 unsigned int pipe = usb_rcvctrlpipe(usbdev, 0);
224 __u8 request = (__u8)0x0d;
225 __u8 requesttype = (__u8)0xc0;
226 __u16 index = get_reg_index(reg);
227 __u16 value = get_reg_value(reg, serial_portnum);
228 u8 *buf;
229 int status;
230
231 buf = kmalloc(1, GFP_KERNEL);
232 if (!buf)
233 return -ENOMEM;
234
235 status = usb_control_msg(usbdev, pipe, request, requesttype, value,
236 index, buf, 1, MOS_WDR_TIMEOUT);
237 if (status == 1) {
238 *data = *buf;
239 } else {
240 dev_err(&usbdev->dev,
241 "mos7720: usb_control_msg() failed: %d\n", status);
242 if (status >= 0)
243 status = -EIO;
244 *data = 0;
245 }
246
247 kfree(buf);
248
249 return status;
250 }
251
252 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
253
254 static inline int mos7715_change_mode(struct mos7715_parport *mos_parport,
255 enum mos7715_pp_modes mode)
256 {
257 mos_parport->shadowECR = mode;
258 write_mos_reg(mos_parport->serial, dummy, MOS7720_ECR,
259 mos_parport->shadowECR);
260 return 0;
261 }
262
263 static void destroy_mos_parport(struct kref *kref)
264 {
265 struct mos7715_parport *mos_parport =
266 container_of(kref, struct mos7715_parport, ref_count);
267
268 kfree(mos_parport);
269 }
270
271 static void destroy_urbtracker(struct kref *kref)
272 {
273 struct urbtracker *urbtrack =
274 container_of(kref, struct urbtracker, ref_count);
275 struct mos7715_parport *mos_parport = urbtrack->mos_parport;
276
277 usb_free_urb(urbtrack->urb);
278 kfree(urbtrack->setup);
279 kfree(urbtrack);
280 kref_put(&mos_parport->ref_count, destroy_mos_parport);
281 }
282
283 /*
284 * This runs as a tasklet when sending an urb in a non-blocking parallel
285 * port callback had to be deferred because the disconnect mutex could not be
286 * obtained at the time.
287 */
288 static void send_deferred_urbs(unsigned long _mos_parport)
289 {
290 int ret_val;
291 unsigned long flags;
292 struct mos7715_parport *mos_parport = (void *)_mos_parport;
293 struct urbtracker *urbtrack, *tmp;
294 struct list_head *cursor, *next;
295 struct device *dev;
296
297 /* if release function ran, game over */
298 if (unlikely(mos_parport->serial == NULL))
299 return;
300
301 dev = &mos_parport->serial->dev->dev;
302
303 /* try again to get the mutex */
304 if (!mutex_trylock(&mos_parport->serial->disc_mutex)) {
305 dev_dbg(dev, "%s: rescheduling tasklet\n", __func__);
306 tasklet_schedule(&mos_parport->urb_tasklet);
307 return;
308 }
309
310 /* if device disconnected, game over */
311 if (unlikely(mos_parport->serial->disconnected)) {
312 mutex_unlock(&mos_parport->serial->disc_mutex);
313 return;
314 }
315
316 spin_lock_irqsave(&mos_parport->listlock, flags);
317 if (list_empty(&mos_parport->deferred_urbs)) {
318 spin_unlock_irqrestore(&mos_parport->listlock, flags);
319 mutex_unlock(&mos_parport->serial->disc_mutex);
320 dev_dbg(dev, "%s: deferred_urbs list empty\n", __func__);
321 return;
322 }
323
324 /* move contents of deferred_urbs list to active_urbs list and submit */
325 list_for_each_safe(cursor, next, &mos_parport->deferred_urbs)
326 list_move_tail(cursor, &mos_parport->active_urbs);
327 list_for_each_entry_safe(urbtrack, tmp, &mos_parport->active_urbs,
328 urblist_entry) {
329 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
330 dev_dbg(dev, "%s: urb submitted\n", __func__);
331 if (ret_val) {
332 dev_err(dev, "usb_submit_urb() failed: %d\n", ret_val);
333 list_del(&urbtrack->urblist_entry);
334 kref_put(&urbtrack->ref_count, destroy_urbtracker);
335 }
336 }
337 spin_unlock_irqrestore(&mos_parport->listlock, flags);
338 mutex_unlock(&mos_parport->serial->disc_mutex);
339 }
340
341 /* callback for parallel port control urbs submitted asynchronously */
342 static void async_complete(struct urb *urb)
343 {
344 struct urbtracker *urbtrack = urb->context;
345 int status = urb->status;
346
347 if (unlikely(status))
348 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n", __func__, status);
349
350 /* remove the urbtracker from the active_urbs list */
351 spin_lock(&urbtrack->mos_parport->listlock);
352 list_del(&urbtrack->urblist_entry);
353 spin_unlock(&urbtrack->mos_parport->listlock);
354 kref_put(&urbtrack->ref_count, destroy_urbtracker);
355 }
356
357 static int write_parport_reg_nonblock(struct mos7715_parport *mos_parport,
358 enum mos_regs reg, __u8 data)
359 {
360 struct urbtracker *urbtrack;
361 int ret_val;
362 unsigned long flags;
363 struct usb_serial *serial = mos_parport->serial;
364 struct usb_device *usbdev = serial->dev;
365
366 /* create and initialize the control urb and containing urbtracker */
367 urbtrack = kmalloc(sizeof(struct urbtracker), GFP_ATOMIC);
368 if (!urbtrack)
369 return -ENOMEM;
370
371 kref_get(&mos_parport->ref_count);
372 urbtrack->mos_parport = mos_parport;
373 urbtrack->urb = usb_alloc_urb(0, GFP_ATOMIC);
374 if (!urbtrack->urb) {
375 kfree(urbtrack);
376 return -ENOMEM;
377 }
378 urbtrack->setup = kmalloc(sizeof(*urbtrack->setup), GFP_ATOMIC);
379 if (!urbtrack->setup) {
380 usb_free_urb(urbtrack->urb);
381 kfree(urbtrack);
382 return -ENOMEM;
383 }
384 urbtrack->setup->bRequestType = (__u8)0x40;
385 urbtrack->setup->bRequest = (__u8)0x0e;
386 urbtrack->setup->wValue = cpu_to_le16(get_reg_value(reg, dummy));
387 urbtrack->setup->wIndex = cpu_to_le16(get_reg_index(reg));
388 urbtrack->setup->wLength = 0;
389 usb_fill_control_urb(urbtrack->urb, usbdev,
390 usb_sndctrlpipe(usbdev, 0),
391 (unsigned char *)urbtrack->setup,
392 NULL, 0, async_complete, urbtrack);
393 kref_init(&urbtrack->ref_count);
394 INIT_LIST_HEAD(&urbtrack->urblist_entry);
395
396 /*
397 * get the disconnect mutex, or add tracker to the deferred_urbs list
398 * and schedule a tasklet to try again later
399 */
400 if (!mutex_trylock(&serial->disc_mutex)) {
401 spin_lock_irqsave(&mos_parport->listlock, flags);
402 list_add_tail(&urbtrack->urblist_entry,
403 &mos_parport->deferred_urbs);
404 spin_unlock_irqrestore(&mos_parport->listlock, flags);
405 tasklet_schedule(&mos_parport->urb_tasklet);
406 dev_dbg(&usbdev->dev, "tasklet scheduled\n");
407 return 0;
408 }
409
410 /* bail if device disconnected */
411 if (serial->disconnected) {
412 kref_put(&urbtrack->ref_count, destroy_urbtracker);
413 mutex_unlock(&serial->disc_mutex);
414 return -ENODEV;
415 }
416
417 /* add the tracker to the active_urbs list and submit */
418 spin_lock_irqsave(&mos_parport->listlock, flags);
419 list_add_tail(&urbtrack->urblist_entry, &mos_parport->active_urbs);
420 spin_unlock_irqrestore(&mos_parport->listlock, flags);
421 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
422 mutex_unlock(&serial->disc_mutex);
423 if (ret_val) {
424 dev_err(&usbdev->dev,
425 "%s: submit_urb() failed: %d\n", __func__, ret_val);
426 spin_lock_irqsave(&mos_parport->listlock, flags);
427 list_del(&urbtrack->urblist_entry);
428 spin_unlock_irqrestore(&mos_parport->listlock, flags);
429 kref_put(&urbtrack->ref_count, destroy_urbtracker);
430 return ret_val;
431 }
432 return 0;
433 }
434
435 /*
436 * This is the the common top part of all parallel port callback operations that
437 * send synchronous messages to the device. This implements convoluted locking
438 * that avoids two scenarios: (1) a port operation is called after usbserial
439 * has called our release function, at which point struct mos7715_parport has
440 * been destroyed, and (2) the device has been disconnected, but usbserial has
441 * not called the release function yet because someone has a serial port open.
442 * The shared release_lock prevents the first, and the mutex and disconnected
443 * flag maintained by usbserial covers the second. We also use the msg_pending
444 * flag to ensure that all synchronous usb message calls have completed before
445 * our release function can return.
446 */
447 static int parport_prologue(struct parport *pp)
448 {
449 struct mos7715_parport *mos_parport;
450
451 spin_lock(&release_lock);
452 mos_parport = pp->private_data;
453 if (unlikely(mos_parport == NULL)) {
454 /* release fn called, port struct destroyed */
455 spin_unlock(&release_lock);
456 return -1;
457 }
458 mos_parport->msg_pending = true; /* synch usb call pending */
459 reinit_completion(&mos_parport->syncmsg_compl);
460 spin_unlock(&release_lock);
461
462 mutex_lock(&mos_parport->serial->disc_mutex);
463 if (mos_parport->serial->disconnected) {
464 /* device disconnected */
465 mutex_unlock(&mos_parport->serial->disc_mutex);
466 mos_parport->msg_pending = false;
467 complete(&mos_parport->syncmsg_compl);
468 return -1;
469 }
470
471 return 0;
472 }
473
474 /*
475 * This is the common bottom part of all parallel port functions that send
476 * synchronous messages to the device.
477 */
478 static inline void parport_epilogue(struct parport *pp)
479 {
480 struct mos7715_parport *mos_parport = pp->private_data;
481 mutex_unlock(&mos_parport->serial->disc_mutex);
482 mos_parport->msg_pending = false;
483 complete(&mos_parport->syncmsg_compl);
484 }
485
486 static void parport_mos7715_write_data(struct parport *pp, unsigned char d)
487 {
488 struct mos7715_parport *mos_parport = pp->private_data;
489
490 if (parport_prologue(pp) < 0)
491 return;
492 mos7715_change_mode(mos_parport, SPP);
493 write_mos_reg(mos_parport->serial, dummy, MOS7720_DPR, (__u8)d);
494 parport_epilogue(pp);
495 }
496
497 static unsigned char parport_mos7715_read_data(struct parport *pp)
498 {
499 struct mos7715_parport *mos_parport = pp->private_data;
500 unsigned char d;
501
502 if (parport_prologue(pp) < 0)
503 return 0;
504 read_mos_reg(mos_parport->serial, dummy, MOS7720_DPR, &d);
505 parport_epilogue(pp);
506 return d;
507 }
508
509 static void parport_mos7715_write_control(struct parport *pp, unsigned char d)
510 {
511 struct mos7715_parport *mos_parport = pp->private_data;
512 __u8 data;
513
514 if (parport_prologue(pp) < 0)
515 return;
516 data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0);
517 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, data);
518 mos_parport->shadowDCR = data;
519 parport_epilogue(pp);
520 }
521
522 static unsigned char parport_mos7715_read_control(struct parport *pp)
523 {
524 struct mos7715_parport *mos_parport = pp->private_data;
525 __u8 dcr;
526
527 spin_lock(&release_lock);
528 mos_parport = pp->private_data;
529 if (unlikely(mos_parport == NULL)) {
530 spin_unlock(&release_lock);
531 return 0;
532 }
533 dcr = mos_parport->shadowDCR & 0x0f;
534 spin_unlock(&release_lock);
535 return dcr;
536 }
537
538 static unsigned char parport_mos7715_frob_control(struct parport *pp,
539 unsigned char mask,
540 unsigned char val)
541 {
542 struct mos7715_parport *mos_parport = pp->private_data;
543 __u8 dcr;
544
545 mask &= 0x0f;
546 val &= 0x0f;
547 if (parport_prologue(pp) < 0)
548 return 0;
549 mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val;
550 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
551 mos_parport->shadowDCR);
552 dcr = mos_parport->shadowDCR & 0x0f;
553 parport_epilogue(pp);
554 return dcr;
555 }
556
557 static unsigned char parport_mos7715_read_status(struct parport *pp)
558 {
559 unsigned char status;
560 struct mos7715_parport *mos_parport = pp->private_data;
561
562 spin_lock(&release_lock);
563 mos_parport = pp->private_data;
564 if (unlikely(mos_parport == NULL)) { /* release called */
565 spin_unlock(&release_lock);
566 return 0;
567 }
568 status = atomic_read(&mos_parport->shadowDSR) & 0xf8;
569 spin_unlock(&release_lock);
570 return status;
571 }
572
573 static void parport_mos7715_enable_irq(struct parport *pp)
574 {
575 }
576
577 static void parport_mos7715_disable_irq(struct parport *pp)
578 {
579 }
580
581 static void parport_mos7715_data_forward(struct parport *pp)
582 {
583 struct mos7715_parport *mos_parport = pp->private_data;
584
585 if (parport_prologue(pp) < 0)
586 return;
587 mos7715_change_mode(mos_parport, PS2);
588 mos_parport->shadowDCR &= ~0x20;
589 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
590 mos_parport->shadowDCR);
591 parport_epilogue(pp);
592 }
593
594 static void parport_mos7715_data_reverse(struct parport *pp)
595 {
596 struct mos7715_parport *mos_parport = pp->private_data;
597
598 if (parport_prologue(pp) < 0)
599 return;
600 mos7715_change_mode(mos_parport, PS2);
601 mos_parport->shadowDCR |= 0x20;
602 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
603 mos_parport->shadowDCR);
604 parport_epilogue(pp);
605 }
606
607 static void parport_mos7715_init_state(struct pardevice *dev,
608 struct parport_state *s)
609 {
610 s->u.pc.ctr = DCR_INIT_VAL;
611 s->u.pc.ecr = ECR_INIT_VAL;
612 }
613
614 /* N.B. Parport core code requires that this function not block */
615 static void parport_mos7715_save_state(struct parport *pp,
616 struct parport_state *s)
617 {
618 struct mos7715_parport *mos_parport;
619
620 spin_lock(&release_lock);
621 mos_parport = pp->private_data;
622 if (unlikely(mos_parport == NULL)) { /* release called */
623 spin_unlock(&release_lock);
624 return;
625 }
626 s->u.pc.ctr = mos_parport->shadowDCR;
627 s->u.pc.ecr = mos_parport->shadowECR;
628 spin_unlock(&release_lock);
629 }
630
631 /* N.B. Parport core code requires that this function not block */
632 static void parport_mos7715_restore_state(struct parport *pp,
633 struct parport_state *s)
634 {
635 struct mos7715_parport *mos_parport;
636
637 spin_lock(&release_lock);
638 mos_parport = pp->private_data;
639 if (unlikely(mos_parport == NULL)) { /* release called */
640 spin_unlock(&release_lock);
641 return;
642 }
643 write_parport_reg_nonblock(mos_parport, MOS7720_DCR,
644 mos_parport->shadowDCR);
645 write_parport_reg_nonblock(mos_parport, MOS7720_ECR,
646 mos_parport->shadowECR);
647 spin_unlock(&release_lock);
648 }
649
650 static size_t parport_mos7715_write_compat(struct parport *pp,
651 const void *buffer,
652 size_t len, int flags)
653 {
654 int retval;
655 struct mos7715_parport *mos_parport = pp->private_data;
656 int actual_len;
657
658 if (parport_prologue(pp) < 0)
659 return 0;
660 mos7715_change_mode(mos_parport, PPF);
661 retval = usb_bulk_msg(mos_parport->serial->dev,
662 usb_sndbulkpipe(mos_parport->serial->dev, 2),
663 (void *)buffer, len, &actual_len,
664 MOS_WDR_TIMEOUT);
665 parport_epilogue(pp);
666 if (retval) {
667 dev_err(&mos_parport->serial->dev->dev,
668 "mos7720: usb_bulk_msg() failed: %d\n", retval);
669 return 0;
670 }
671 return actual_len;
672 }
673
674 static struct parport_operations parport_mos7715_ops = {
675 .owner = THIS_MODULE,
676 .write_data = parport_mos7715_write_data,
677 .read_data = parport_mos7715_read_data,
678
679 .write_control = parport_mos7715_write_control,
680 .read_control = parport_mos7715_read_control,
681 .frob_control = parport_mos7715_frob_control,
682
683 .read_status = parport_mos7715_read_status,
684
685 .enable_irq = parport_mos7715_enable_irq,
686 .disable_irq = parport_mos7715_disable_irq,
687
688 .data_forward = parport_mos7715_data_forward,
689 .data_reverse = parport_mos7715_data_reverse,
690
691 .init_state = parport_mos7715_init_state,
692 .save_state = parport_mos7715_save_state,
693 .restore_state = parport_mos7715_restore_state,
694
695 .compat_write_data = parport_mos7715_write_compat,
696
697 .nibble_read_data = parport_ieee1284_read_nibble,
698 .byte_read_data = parport_ieee1284_read_byte,
699 };
700
701 /*
702 * Allocate and initialize parallel port control struct, initialize
703 * the parallel port hardware device, and register with the parport subsystem.
704 */
705 static int mos7715_parport_init(struct usb_serial *serial)
706 {
707 struct mos7715_parport *mos_parport;
708
709 /* allocate and initialize parallel port control struct */
710 mos_parport = kzalloc(sizeof(struct mos7715_parport), GFP_KERNEL);
711 if (!mos_parport)
712 return -ENOMEM;
713
714 mos_parport->msg_pending = false;
715 kref_init(&mos_parport->ref_count);
716 spin_lock_init(&mos_parport->listlock);
717 INIT_LIST_HEAD(&mos_parport->active_urbs);
718 INIT_LIST_HEAD(&mos_parport->deferred_urbs);
719 usb_set_serial_data(serial, mos_parport); /* hijack private pointer */
720 mos_parport->serial = serial;
721 tasklet_init(&mos_parport->urb_tasklet, send_deferred_urbs,
722 (unsigned long) mos_parport);
723 init_completion(&mos_parport->syncmsg_compl);
724
725 /* cycle parallel port reset bit */
726 write_mos_reg(mos_parport->serial, dummy, MOS7720_PP_REG, (__u8)0x80);
727 write_mos_reg(mos_parport->serial, dummy, MOS7720_PP_REG, (__u8)0x00);
728
729 /* initialize device registers */
730 mos_parport->shadowDCR = DCR_INIT_VAL;
731 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
732 mos_parport->shadowDCR);
733 mos_parport->shadowECR = ECR_INIT_VAL;
734 write_mos_reg(mos_parport->serial, dummy, MOS7720_ECR,
735 mos_parport->shadowECR);
736
737 /* register with parport core */
738 mos_parport->pp = parport_register_port(0, PARPORT_IRQ_NONE,
739 PARPORT_DMA_NONE,
740 &parport_mos7715_ops);
741 if (mos_parport->pp == NULL) {
742 dev_err(&serial->interface->dev,
743 "Could not register parport\n");
744 kref_put(&mos_parport->ref_count, destroy_mos_parport);
745 return -EIO;
746 }
747 mos_parport->pp->private_data = mos_parport;
748 mos_parport->pp->modes = PARPORT_MODE_COMPAT | PARPORT_MODE_PCSPP;
749 mos_parport->pp->dev = &serial->interface->dev;
750 parport_announce_port(mos_parport->pp);
751
752 return 0;
753 }
754 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
755
756 /*
757 * mos7720_interrupt_callback
758 * this is the callback function for when we have received data on the
759 * interrupt endpoint.
760 */
761 static void mos7720_interrupt_callback(struct urb *urb)
762 {
763 int result;
764 int length;
765 int status = urb->status;
766 struct device *dev = &urb->dev->dev;
767 __u8 *data;
768 __u8 sp1;
769 __u8 sp2;
770
771 switch (status) {
772 case 0:
773 /* success */
774 break;
775 case -ECONNRESET:
776 case -ENOENT:
777 case -ESHUTDOWN:
778 /* this urb is terminated, clean up */
779 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
780 return;
781 default:
782 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
783 goto exit;
784 }
785
786 length = urb->actual_length;
787 data = urb->transfer_buffer;
788
789 /* Moschip get 4 bytes
790 * Byte 1 IIR Port 1 (port.number is 0)
791 * Byte 2 IIR Port 2 (port.number is 1)
792 * Byte 3 --------------
793 * Byte 4 FIFO status for both */
794
795 /* the above description is inverted
796 * oneukum 2007-03-14 */
797
798 if (unlikely(length != 4)) {
799 dev_dbg(dev, "Wrong data !!!\n");
800 return;
801 }
802
803 sp1 = data[3];
804 sp2 = data[2];
805
806 if ((sp1 | sp2) & 0x01) {
807 /* No Interrupt Pending in both the ports */
808 dev_dbg(dev, "No Interrupt !!!\n");
809 } else {
810 switch (sp1 & 0x0f) {
811 case SERIAL_IIR_RLS:
812 dev_dbg(dev, "Serial Port 1: Receiver status error or address bit detected in 9-bit mode\n");
813 break;
814 case SERIAL_IIR_CTI:
815 dev_dbg(dev, "Serial Port 1: Receiver time out\n");
816 break;
817 case SERIAL_IIR_MS:
818 /* dev_dbg(dev, "Serial Port 1: Modem status change\n"); */
819 break;
820 }
821
822 switch (sp2 & 0x0f) {
823 case SERIAL_IIR_RLS:
824 dev_dbg(dev, "Serial Port 2: Receiver status error or address bit detected in 9-bit mode\n");
825 break;
826 case SERIAL_IIR_CTI:
827 dev_dbg(dev, "Serial Port 2: Receiver time out\n");
828 break;
829 case SERIAL_IIR_MS:
830 /* dev_dbg(dev, "Serial Port 2: Modem status change\n"); */
831 break;
832 }
833 }
834
835 exit:
836 result = usb_submit_urb(urb, GFP_ATOMIC);
837 if (result)
838 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result);
839 }
840
841 /*
842 * mos7715_interrupt_callback
843 * this is the 7715's callback function for when we have received data on
844 * the interrupt endpoint.
845 */
846 static void mos7715_interrupt_callback(struct urb *urb)
847 {
848 int result;
849 int length;
850 int status = urb->status;
851 struct device *dev = &urb->dev->dev;
852 __u8 *data;
853 __u8 iir;
854
855 switch (status) {
856 case 0:
857 /* success */
858 break;
859 case -ECONNRESET:
860 case -ENOENT:
861 case -ESHUTDOWN:
862 case -ENODEV:
863 /* this urb is terminated, clean up */
864 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
865 return;
866 default:
867 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
868 goto exit;
869 }
870
871 length = urb->actual_length;
872 data = urb->transfer_buffer;
873
874 /* Structure of data from 7715 device:
875 * Byte 1: IIR serial Port
876 * Byte 2: unused
877 * Byte 2: DSR parallel port
878 * Byte 4: FIFO status for both */
879
880 if (unlikely(length != 4)) {
881 dev_dbg(dev, "Wrong data !!!\n");
882 return;
883 }
884
885 iir = data[0];
886 if (!(iir & 0x01)) { /* serial port interrupt pending */
887 switch (iir & 0x0f) {
888 case SERIAL_IIR_RLS:
889 dev_dbg(dev, "Serial Port: Receiver status error or address bit detected in 9-bit mode\n");
890 break;
891 case SERIAL_IIR_CTI:
892 dev_dbg(dev, "Serial Port: Receiver time out\n");
893 break;
894 case SERIAL_IIR_MS:
895 /* dev_dbg(dev, "Serial Port: Modem status change\n"); */
896 break;
897 }
898 }
899
900 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
901 { /* update local copy of DSR reg */
902 struct usb_serial_port *port = urb->context;
903 struct mos7715_parport *mos_parport = port->serial->private;
904 if (unlikely(mos_parport == NULL))
905 return;
906 atomic_set(&mos_parport->shadowDSR, data[2]);
907 }
908 #endif
909
910 exit:
911 result = usb_submit_urb(urb, GFP_ATOMIC);
912 if (result)
913 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result);
914 }
915
916 /*
917 * mos7720_bulk_in_callback
918 * this is the callback function for when we have received data on the
919 * bulk in endpoint.
920 */
921 static void mos7720_bulk_in_callback(struct urb *urb)
922 {
923 int retval;
924 unsigned char *data ;
925 struct usb_serial_port *port;
926 int status = urb->status;
927
928 if (status) {
929 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
930 return;
931 }
932
933 port = urb->context;
934
935 dev_dbg(&port->dev, "Entering...%s\n", __func__);
936
937 data = urb->transfer_buffer;
938
939 if (urb->actual_length) {
940 tty_insert_flip_string(&port->port, data, urb->actual_length);
941 tty_flip_buffer_push(&port->port);
942 }
943
944 if (port->read_urb->status != -EINPROGRESS) {
945 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
946 if (retval)
947 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
948 }
949 }
950
951 /*
952 * mos7720_bulk_out_data_callback
953 * this is the callback function for when we have finished sending serial
954 * data on the bulk out endpoint.
955 */
956 static void mos7720_bulk_out_data_callback(struct urb *urb)
957 {
958 struct moschip_port *mos7720_port;
959 int status = urb->status;
960
961 if (status) {
962 dev_dbg(&urb->dev->dev, "nonzero write bulk status received:%d\n", status);
963 return;
964 }
965
966 mos7720_port = urb->context;
967 if (!mos7720_port) {
968 dev_dbg(&urb->dev->dev, "NULL mos7720_port pointer\n");
969 return ;
970 }
971
972 if (mos7720_port->open)
973 tty_port_tty_wakeup(&mos7720_port->port->port);
974 }
975
976 static int mos77xx_calc_num_ports(struct usb_serial *serial,
977 struct usb_serial_endpoints *epds)
978 {
979 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
980
981 if (product == MOSCHIP_DEVICE_ID_7715) {
982 /*
983 * The 7715 uses the first bulk in/out endpoint pair for the
984 * parallel port, and the second for the serial port. We swap
985 * the endpoint descriptors here so that the the first and
986 * only registered port structure uses the serial-port
987 * endpoints.
988 */
989 swap(epds->bulk_in[0], epds->bulk_in[1]);
990 swap(epds->bulk_out[0], epds->bulk_out[1]);
991
992 return 1;
993 }
994
995 return 2;
996 }
997
998 static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port)
999 {
1000 struct usb_serial *serial;
1001 struct urb *urb;
1002 struct moschip_port *mos7720_port;
1003 int response;
1004 int port_number;
1005 __u8 data;
1006 int allocated_urbs = 0;
1007 int j;
1008
1009 serial = port->serial;
1010
1011 mos7720_port = usb_get_serial_port_data(port);
1012 if (mos7720_port == NULL)
1013 return -ENODEV;
1014
1015 usb_clear_halt(serial->dev, port->write_urb->pipe);
1016 usb_clear_halt(serial->dev, port->read_urb->pipe);
1017
1018 /* Initialising the write urb pool */
1019 for (j = 0; j < NUM_URBS; ++j) {
1020 urb = usb_alloc_urb(0, GFP_KERNEL);
1021 mos7720_port->write_urb_pool[j] = urb;
1022 if (!urb)
1023 continue;
1024
1025 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1026 GFP_KERNEL);
1027 if (!urb->transfer_buffer) {
1028 usb_free_urb(mos7720_port->write_urb_pool[j]);
1029 mos7720_port->write_urb_pool[j] = NULL;
1030 continue;
1031 }
1032 allocated_urbs++;
1033 }
1034
1035 if (!allocated_urbs)
1036 return -ENOMEM;
1037
1038 /* Initialize MCS7720 -- Write Init values to corresponding Registers
1039 *
1040 * Register Index
1041 * 0 : MOS7720_THR/MOS7720_RHR
1042 * 1 : MOS7720_IER
1043 * 2 : MOS7720_FCR
1044 * 3 : MOS7720_LCR
1045 * 4 : MOS7720_MCR
1046 * 5 : MOS7720_LSR
1047 * 6 : MOS7720_MSR
1048 * 7 : MOS7720_SPR
1049 *
1050 * 0x08 : SP1/2 Control Reg
1051 */
1052 port_number = port->port_number;
1053 read_mos_reg(serial, port_number, MOS7720_LSR, &data);
1054
1055 dev_dbg(&port->dev, "SS::%p LSR:%x\n", mos7720_port, data);
1056
1057 write_mos_reg(serial, dummy, MOS7720_SP1_REG, 0x02);
1058 write_mos_reg(serial, dummy, MOS7720_SP2_REG, 0x02);
1059
1060 write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
1061 write_mos_reg(serial, port_number, MOS7720_FCR, 0x00);
1062
1063 write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf);
1064 mos7720_port->shadowLCR = 0x03;
1065 write_mos_reg(serial, port_number, MOS7720_LCR,
1066 mos7720_port->shadowLCR);
1067 mos7720_port->shadowMCR = 0x0b;
1068 write_mos_reg(serial, port_number, MOS7720_MCR,
1069 mos7720_port->shadowMCR);
1070
1071 write_mos_reg(serial, port_number, MOS7720_SP_CONTROL_REG, 0x00);
1072 read_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, &data);
1073 data = data | (port->port_number + 1);
1074 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, data);
1075 mos7720_port->shadowLCR = 0x83;
1076 write_mos_reg(serial, port_number, MOS7720_LCR,
1077 mos7720_port->shadowLCR);
1078 write_mos_reg(serial, port_number, MOS7720_THR, 0x0c);
1079 write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
1080 mos7720_port->shadowLCR = 0x03;
1081 write_mos_reg(serial, port_number, MOS7720_LCR,
1082 mos7720_port->shadowLCR);
1083 write_mos_reg(serial, port_number, MOS7720_IER, 0x0c);
1084
1085 response = usb_submit_urb(port->read_urb, GFP_KERNEL);
1086 if (response)
1087 dev_err(&port->dev, "%s - Error %d submitting read urb\n",
1088 __func__, response);
1089
1090 /* initialize our port settings */
1091 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */
1092
1093 /* send a open port command */
1094 mos7720_port->open = 1;
1095
1096 return 0;
1097 }
1098
1099 /*
1100 * mos7720_chars_in_buffer
1101 * this function is called by the tty driver when it wants to know how many
1102 * bytes of data we currently have outstanding in the port (data that has
1103 * been written, but hasn't made it out the port yet)
1104 * If successful, we return the number of bytes left to be written in the
1105 * system,
1106 * Otherwise we return a negative error number.
1107 */
1108 static int mos7720_chars_in_buffer(struct tty_struct *tty)
1109 {
1110 struct usb_serial_port *port = tty->driver_data;
1111 int i;
1112 int chars = 0;
1113 struct moschip_port *mos7720_port;
1114
1115 mos7720_port = usb_get_serial_port_data(port);
1116 if (mos7720_port == NULL)
1117 return 0;
1118
1119 for (i = 0; i < NUM_URBS; ++i) {
1120 if (mos7720_port->write_urb_pool[i] &&
1121 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS)
1122 chars += URB_TRANSFER_BUFFER_SIZE;
1123 }
1124 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1125 return chars;
1126 }
1127
1128 static void mos7720_close(struct usb_serial_port *port)
1129 {
1130 struct usb_serial *serial;
1131 struct moschip_port *mos7720_port;
1132 int j;
1133
1134 serial = port->serial;
1135
1136 mos7720_port = usb_get_serial_port_data(port);
1137 if (mos7720_port == NULL)
1138 return;
1139
1140 for (j = 0; j < NUM_URBS; ++j)
1141 usb_kill_urb(mos7720_port->write_urb_pool[j]);
1142
1143 /* Freeing Write URBs */
1144 for (j = 0; j < NUM_URBS; ++j) {
1145 if (mos7720_port->write_urb_pool[j]) {
1146 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer);
1147 usb_free_urb(mos7720_port->write_urb_pool[j]);
1148 }
1149 }
1150
1151 /* While closing port, shutdown all bulk read, write *
1152 * and interrupt read if they exists, otherwise nop */
1153 usb_kill_urb(port->write_urb);
1154 usb_kill_urb(port->read_urb);
1155
1156 write_mos_reg(serial, port->port_number, MOS7720_MCR, 0x00);
1157 write_mos_reg(serial, port->port_number, MOS7720_IER, 0x00);
1158
1159 mos7720_port->open = 0;
1160 }
1161
1162 static void mos7720_break(struct tty_struct *tty, int break_state)
1163 {
1164 struct usb_serial_port *port = tty->driver_data;
1165 unsigned char data;
1166 struct usb_serial *serial;
1167 struct moschip_port *mos7720_port;
1168
1169 serial = port->serial;
1170
1171 mos7720_port = usb_get_serial_port_data(port);
1172 if (mos7720_port == NULL)
1173 return;
1174
1175 if (break_state == -1)
1176 data = mos7720_port->shadowLCR | UART_LCR_SBC;
1177 else
1178 data = mos7720_port->shadowLCR & ~UART_LCR_SBC;
1179
1180 mos7720_port->shadowLCR = data;
1181 write_mos_reg(serial, port->port_number, MOS7720_LCR,
1182 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_ATOMIC);
1253 if (!urb->transfer_buffer)
1254 goto exit;
1255 }
1256 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1257
1258 memcpy(urb->transfer_buffer, current_position, transfer_size);
1259 usb_serial_debug_data(&port->dev, __func__, transfer_size,
1260 urb->transfer_buffer);
1261
1262 /* fill urb with data and submit */
1263 usb_fill_bulk_urb(urb, serial->dev,
1264 usb_sndbulkpipe(serial->dev,
1265 port->bulk_out_endpointAddress),
1266 urb->transfer_buffer, transfer_size,
1267 mos7720_bulk_out_data_callback, mos7720_port);
1268
1269 /* send it down the pipe */
1270 status = usb_submit_urb(urb, GFP_ATOMIC);
1271 if (status) {
1272 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1273 "with status = %d\n", __func__, status);
1274 bytes_sent = status;
1275 goto exit;
1276 }
1277 bytes_sent = transfer_size;
1278
1279 exit:
1280 return bytes_sent;
1281 }
1282
1283 static void mos7720_throttle(struct tty_struct *tty)
1284 {
1285 struct usb_serial_port *port = tty->driver_data;
1286 struct moschip_port *mos7720_port;
1287 int status;
1288
1289 mos7720_port = usb_get_serial_port_data(port);
1290
1291 if (mos7720_port == NULL)
1292 return;
1293
1294 if (!mos7720_port->open) {
1295 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1296 return;
1297 }
1298
1299 /* if we are implementing XON/XOFF, send the stop character */
1300 if (I_IXOFF(tty)) {
1301 unsigned char stop_char = STOP_CHAR(tty);
1302 status = mos7720_write(tty, port, &stop_char, 1);
1303 if (status <= 0)
1304 return;
1305 }
1306
1307 /* if we are implementing RTS/CTS, toggle that line */
1308 if (C_CRTSCTS(tty)) {
1309 mos7720_port->shadowMCR &= ~UART_MCR_RTS;
1310 write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
1311 mos7720_port->shadowMCR);
1312 }
1313 }
1314
1315 static void mos7720_unthrottle(struct tty_struct *tty)
1316 {
1317 struct usb_serial_port *port = tty->driver_data;
1318 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1319 int status;
1320
1321 if (mos7720_port == NULL)
1322 return;
1323
1324 if (!mos7720_port->open) {
1325 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1326 return;
1327 }
1328
1329 /* if we are implementing XON/XOFF, send the start character */
1330 if (I_IXOFF(tty)) {
1331 unsigned char start_char = START_CHAR(tty);
1332 status = mos7720_write(tty, port, &start_char, 1);
1333 if (status <= 0)
1334 return;
1335 }
1336
1337 /* if we are implementing RTS/CTS, toggle that line */
1338 if (C_CRTSCTS(tty)) {
1339 mos7720_port->shadowMCR |= UART_MCR_RTS;
1340 write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
1341 mos7720_port->shadowMCR);
1342 }
1343 }
1344
1345 /* FIXME: this function does not work */
1346 static int set_higher_rates(struct moschip_port *mos7720_port,
1347 unsigned int baud)
1348 {
1349 struct usb_serial_port *port;
1350 struct usb_serial *serial;
1351 int port_number;
1352 enum mos_regs sp_reg;
1353 if (mos7720_port == NULL)
1354 return -EINVAL;
1355
1356 port = mos7720_port->port;
1357 serial = port->serial;
1358
1359 /***********************************************
1360 * Init Sequence for higher rates
1361 ***********************************************/
1362 dev_dbg(&port->dev, "Sending Setting Commands ..........\n");
1363 port_number = port->port_number;
1364
1365 write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
1366 write_mos_reg(serial, port_number, MOS7720_FCR, 0x00);
1367 write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf);
1368 mos7720_port->shadowMCR = 0x0b;
1369 write_mos_reg(serial, port_number, MOS7720_MCR,
1370 mos7720_port->shadowMCR);
1371 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 0x00);
1372
1373 /***********************************************
1374 * Set for higher rates *
1375 ***********************************************/
1376 /* writing baud rate verbatum into uart clock field clearly not right */
1377 if (port_number == 0)
1378 sp_reg = MOS7720_SP1_REG;
1379 else
1380 sp_reg = MOS7720_SP2_REG;
1381 write_mos_reg(serial, dummy, sp_reg, baud * 0x10);
1382 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 0x03);
1383 mos7720_port->shadowMCR = 0x2b;
1384 write_mos_reg(serial, port_number, MOS7720_MCR,
1385 mos7720_port->shadowMCR);
1386
1387 /***********************************************
1388 * Set DLL/DLM
1389 ***********************************************/
1390 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1391 write_mos_reg(serial, port_number, MOS7720_LCR,
1392 mos7720_port->shadowLCR);
1393 write_mos_reg(serial, port_number, MOS7720_DLL, 0x01);
1394 write_mos_reg(serial, port_number, MOS7720_DLM, 0x00);
1395 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1396 write_mos_reg(serial, port_number, MOS7720_LCR,
1397 mos7720_port->shadowLCR);
1398
1399 return 0;
1400 }
1401
1402 /* baud rate information */
1403 struct divisor_table_entry {
1404 __u32 baudrate;
1405 __u16 divisor;
1406 };
1407
1408 /* Define table of divisors for moschip 7720 hardware *
1409 * These assume a 3.6864MHz crystal, the standard /16, and *
1410 * MCR.7 = 0. */
1411 static const struct divisor_table_entry divisor_table[] = {
1412 { 50, 2304},
1413 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */
1414 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */
1415 { 150, 768},
1416 { 300, 384},
1417 { 600, 192},
1418 { 1200, 96},
1419 { 1800, 64},
1420 { 2400, 48},
1421 { 4800, 24},
1422 { 7200, 16},
1423 { 9600, 12},
1424 { 19200, 6},
1425 { 38400, 3},
1426 { 57600, 2},
1427 { 115200, 1},
1428 };
1429
1430 /*****************************************************************************
1431 * calc_baud_rate_divisor
1432 * this function calculates the proper baud rate divisor for the specified
1433 * baud rate.
1434 *****************************************************************************/
1435 static int calc_baud_rate_divisor(struct usb_serial_port *port, int baudrate, int *divisor)
1436 {
1437 int i;
1438 __u16 custom;
1439 __u16 round1;
1440 __u16 round;
1441
1442
1443 dev_dbg(&port->dev, "%s - %d\n", __func__, baudrate);
1444
1445 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) {
1446 if (divisor_table[i].baudrate == baudrate) {
1447 *divisor = divisor_table[i].divisor;
1448 return 0;
1449 }
1450 }
1451
1452 /* After trying for all the standard baud rates *
1453 * Try calculating the divisor for this baud rate */
1454 if (baudrate > 75 && baudrate < 230400) {
1455 /* get the divisor */
1456 custom = (__u16)(230400L / baudrate);
1457
1458 /* Check for round off */
1459 round1 = (__u16)(2304000L / baudrate);
1460 round = (__u16)(round1 - (custom * 10));
1461 if (round > 4)
1462 custom++;
1463 *divisor = custom;
1464
1465 dev_dbg(&port->dev, "Baud %d = %d\n", baudrate, custom);
1466 return 0;
1467 }
1468
1469 dev_dbg(&port->dev, "Baud calculation Failed...\n");
1470 return -EINVAL;
1471 }
1472
1473 /*
1474 * send_cmd_write_baud_rate
1475 * this function sends the proper command to change the baud rate of the
1476 * specified port.
1477 */
1478 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port,
1479 int baudrate)
1480 {
1481 struct usb_serial_port *port;
1482 struct usb_serial *serial;
1483 int divisor;
1484 int status;
1485 unsigned char number;
1486
1487 if (mos7720_port == NULL)
1488 return -1;
1489
1490 port = mos7720_port->port;
1491 serial = port->serial;
1492
1493 number = port->port_number;
1494 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudrate);
1495
1496 /* Calculate the Divisor */
1497 status = calc_baud_rate_divisor(port, baudrate, &divisor);
1498 if (status) {
1499 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1500 return status;
1501 }
1502
1503 /* Enable access to divisor latch */
1504 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1505 write_mos_reg(serial, number, MOS7720_LCR, mos7720_port->shadowLCR);
1506
1507 /* Write the divisor */
1508 write_mos_reg(serial, number, MOS7720_DLL, (__u8)(divisor & 0xff));
1509 write_mos_reg(serial, number, MOS7720_DLM,
1510 (__u8)((divisor & 0xff00) >> 8));
1511
1512 /* Disable access to divisor latch */
1513 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1514 write_mos_reg(serial, number, MOS7720_LCR, mos7720_port->shadowLCR);
1515
1516 return status;
1517 }
1518
1519 /*
1520 * change_port_settings
1521 * This routine is called to set the UART on the device to match
1522 * the specified new settings.
1523 */
1524 static void change_port_settings(struct tty_struct *tty,
1525 struct moschip_port *mos7720_port,
1526 struct ktermios *old_termios)
1527 {
1528 struct usb_serial_port *port;
1529 struct usb_serial *serial;
1530 int baud;
1531 unsigned cflag;
1532 unsigned iflag;
1533 __u8 mask = 0xff;
1534 __u8 lData;
1535 __u8 lParity;
1536 __u8 lStop;
1537 int status;
1538 int port_number;
1539
1540 if (mos7720_port == NULL)
1541 return ;
1542
1543 port = mos7720_port->port;
1544 serial = port->serial;
1545 port_number = port->port_number;
1546
1547 if (!mos7720_port->open) {
1548 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1549 return;
1550 }
1551
1552 lData = UART_LCR_WLEN8;
1553 lStop = 0x00; /* 1 stop bit */
1554 lParity = 0x00; /* No parity */
1555
1556 cflag = tty->termios.c_cflag;
1557 iflag = tty->termios.c_iflag;
1558
1559 /* Change the number of bits */
1560 switch (cflag & CSIZE) {
1561 case CS5:
1562 lData = UART_LCR_WLEN5;
1563 mask = 0x1f;
1564 break;
1565
1566 case CS6:
1567 lData = UART_LCR_WLEN6;
1568 mask = 0x3f;
1569 break;
1570
1571 case CS7:
1572 lData = UART_LCR_WLEN7;
1573 mask = 0x7f;
1574 break;
1575 default:
1576 case CS8:
1577 lData = UART_LCR_WLEN8;
1578 break;
1579 }
1580
1581 /* Change the Parity bit */
1582 if (cflag & PARENB) {
1583 if (cflag & PARODD) {
1584 lParity = UART_LCR_PARITY;
1585 dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1586 } else {
1587 lParity = (UART_LCR_EPAR | UART_LCR_PARITY);
1588 dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1589 }
1590
1591 } else {
1592 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1593 }
1594
1595 if (cflag & CMSPAR)
1596 lParity = lParity | 0x20;
1597
1598 /* Change the Stop bit */
1599 if (cflag & CSTOPB) {
1600 lStop = UART_LCR_STOP;
1601 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1602 } else {
1603 lStop = 0x00;
1604 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1605 }
1606
1607 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
1608 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
1609 #define LCR_PAR_MASK 0x38 /* Mask for parity field */
1610
1611 /* Update the LCR with the correct value */
1612 mos7720_port->shadowLCR &=
1613 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1614 mos7720_port->shadowLCR |= (lData | lParity | lStop);
1615
1616
1617 /* Disable Interrupts */
1618 write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
1619 write_mos_reg(serial, port_number, MOS7720_FCR, 0x00);
1620 write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf);
1621
1622 /* Send the updated LCR value to the mos7720 */
1623 write_mos_reg(serial, port_number, MOS7720_LCR,
1624 mos7720_port->shadowLCR);
1625 mos7720_port->shadowMCR = 0x0b;
1626 write_mos_reg(serial, port_number, MOS7720_MCR,
1627 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, MOS7720_SP_CONTROL_REG,
1640 0x01);
1641 else
1642 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG,
1643 0x02);
1644
1645 } else
1646 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY);
1647
1648 write_mos_reg(serial, port_number, MOS7720_MCR,
1649 mos7720_port->shadowMCR);
1650
1651 /* Determine divisor based on baud rate */
1652 baud = tty_get_baud_rate(tty);
1653 if (!baud) {
1654 /* pick a default, any default... */
1655 dev_dbg(&port->dev, "Picked default baud...\n");
1656 baud = 9600;
1657 }
1658
1659 if (baud >= 230400) {
1660 set_higher_rates(mos7720_port, baud);
1661 /* Enable Interrupts */
1662 write_mos_reg(serial, port_number, MOS7720_IER, 0x0c);
1663 return;
1664 }
1665
1666 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1667 status = send_cmd_write_baud_rate(mos7720_port, baud);
1668 /* FIXME: needs to write actual resulting baud back not just
1669 blindly do so */
1670 if (cflag & CBAUD)
1671 tty_encode_baud_rate(tty, baud, baud);
1672 /* Enable Interrupts */
1673 write_mos_reg(serial, port_number, MOS7720_IER, 0x0c);
1674
1675 if (port->read_urb->status != -EINPROGRESS) {
1676 status = usb_submit_urb(port->read_urb, GFP_KERNEL);
1677 if (status)
1678 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status);
1679 }
1680 }
1681
1682 /*
1683 * mos7720_set_termios
1684 * this function is called by the tty driver when it wants to change the
1685 * termios structure.
1686 */
1687 static void mos7720_set_termios(struct tty_struct *tty,
1688 struct usb_serial_port *port, struct ktermios *old_termios)
1689 {
1690 int status;
1691 struct usb_serial *serial;
1692 struct moschip_port *mos7720_port;
1693
1694 serial = port->serial;
1695
1696 mos7720_port = usb_get_serial_port_data(port);
1697
1698 if (mos7720_port == NULL)
1699 return;
1700
1701 if (!mos7720_port->open) {
1702 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1703 return;
1704 }
1705
1706 /* change the port settings to the new ones specified */
1707 change_port_settings(tty, mos7720_port, old_termios);
1708
1709 if (port->read_urb->status != -EINPROGRESS) {
1710 status = usb_submit_urb(port->read_urb, GFP_KERNEL);
1711 if (status)
1712 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status);
1713 }
1714 }
1715
1716 /*
1717 * get_lsr_info - get line status register info
1718 *
1719 * Purpose: Let user call ioctl() to get info when the UART physically
1720 * is emptied. On bus types like RS485, the transmitter must
1721 * release the bus after transmitting. This must be done when
1722 * the transmit shift register is empty, not be done when the
1723 * transmit holding register is empty. This functionality
1724 * allows an RS485 driver to be written in user space.
1725 */
1726 static int get_lsr_info(struct tty_struct *tty,
1727 struct moschip_port *mos7720_port, unsigned int __user *value)
1728 {
1729 struct usb_serial_port *port = tty->driver_data;
1730 unsigned int result = 0;
1731 unsigned char data = 0;
1732 int port_number = port->port_number;
1733 int count;
1734
1735 count = mos7720_chars_in_buffer(tty);
1736 if (count == 0) {
1737 read_mos_reg(port->serial, port_number, MOS7720_LSR, &data);
1738 if ((data & (UART_LSR_TEMT | UART_LSR_THRE))
1739 == (UART_LSR_TEMT | UART_LSR_THRE)) {
1740 dev_dbg(&port->dev, "%s -- Empty\n", __func__);
1741 result = TIOCSER_TEMT;
1742 }
1743 }
1744 if (copy_to_user(value, &result, sizeof(int)))
1745 return -EFAULT;
1746 return 0;
1747 }
1748
1749 static int mos7720_tiocmget(struct tty_struct *tty)
1750 {
1751 struct usb_serial_port *port = tty->driver_data;
1752 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1753 unsigned int result = 0;
1754 unsigned int mcr ;
1755 unsigned int msr ;
1756
1757 mcr = mos7720_port->shadowMCR;
1758 msr = mos7720_port->shadowMSR;
1759
1760 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */
1761 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */
1762 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */
1763 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */
1764 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */
1765 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
1766
1767 return result;
1768 }
1769
1770 static int mos7720_tiocmset(struct tty_struct *tty,
1771 unsigned int set, unsigned int clear)
1772 {
1773 struct usb_serial_port *port = tty->driver_data;
1774 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1775 unsigned int mcr ;
1776
1777 mcr = mos7720_port->shadowMCR;
1778
1779 if (set & TIOCM_RTS)
1780 mcr |= UART_MCR_RTS;
1781 if (set & TIOCM_DTR)
1782 mcr |= UART_MCR_DTR;
1783 if (set & TIOCM_LOOP)
1784 mcr |= UART_MCR_LOOP;
1785
1786 if (clear & TIOCM_RTS)
1787 mcr &= ~UART_MCR_RTS;
1788 if (clear & TIOCM_DTR)
1789 mcr &= ~UART_MCR_DTR;
1790 if (clear & TIOCM_LOOP)
1791 mcr &= ~UART_MCR_LOOP;
1792
1793 mos7720_port->shadowMCR = mcr;
1794 write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
1795 mos7720_port->shadowMCR);
1796
1797 return 0;
1798 }
1799
1800 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd,
1801 unsigned int __user *value)
1802 {
1803 unsigned int mcr;
1804 unsigned int arg;
1805
1806 struct usb_serial_port *port;
1807
1808 if (mos7720_port == NULL)
1809 return -1;
1810
1811 port = (struct usb_serial_port *)mos7720_port->port;
1812 mcr = mos7720_port->shadowMCR;
1813
1814 if (copy_from_user(&arg, value, sizeof(int)))
1815 return -EFAULT;
1816
1817 switch (cmd) {
1818 case TIOCMBIS:
1819 if (arg & TIOCM_RTS)
1820 mcr |= UART_MCR_RTS;
1821 if (arg & TIOCM_DTR)
1822 mcr |= UART_MCR_RTS;
1823 if (arg & TIOCM_LOOP)
1824 mcr |= UART_MCR_LOOP;
1825 break;
1826
1827 case TIOCMBIC:
1828 if (arg & TIOCM_RTS)
1829 mcr &= ~UART_MCR_RTS;
1830 if (arg & TIOCM_DTR)
1831 mcr &= ~UART_MCR_RTS;
1832 if (arg & TIOCM_LOOP)
1833 mcr &= ~UART_MCR_LOOP;
1834 break;
1835
1836 }
1837
1838 mos7720_port->shadowMCR = mcr;
1839 write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
1840 mos7720_port->shadowMCR);
1841
1842 return 0;
1843 }
1844
1845 static int get_serial_info(struct moschip_port *mos7720_port,
1846 struct serial_struct __user *retinfo)
1847 {
1848 struct serial_struct tmp;
1849
1850 memset(&tmp, 0, sizeof(tmp));
1851
1852 tmp.type = PORT_16550A;
1853 tmp.line = mos7720_port->port->minor;
1854 tmp.port = mos7720_port->port->port_number;
1855 tmp.irq = 0;
1856 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1857 tmp.baud_base = 9600;
1858 tmp.close_delay = 5*HZ;
1859 tmp.closing_wait = 30*HZ;
1860
1861 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1862 return -EFAULT;
1863 return 0;
1864 }
1865
1866 static int mos7720_ioctl(struct tty_struct *tty,
1867 unsigned int cmd, unsigned long arg)
1868 {
1869 struct usb_serial_port *port = tty->driver_data;
1870 struct moschip_port *mos7720_port;
1871
1872 mos7720_port = usb_get_serial_port_data(port);
1873 if (mos7720_port == NULL)
1874 return -ENODEV;
1875
1876 switch (cmd) {
1877 case TIOCSERGETLSR:
1878 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
1879 return get_lsr_info(tty, mos7720_port,
1880 (unsigned int __user *)arg);
1881
1882 /* FIXME: These should be using the mode methods */
1883 case TIOCMBIS:
1884 case TIOCMBIC:
1885 dev_dbg(&port->dev, "%s TIOCMSET/TIOCMBIC/TIOCMSET\n", __func__);
1886 return set_modem_info(mos7720_port, cmd,
1887 (unsigned int __user *)arg);
1888
1889 case TIOCGSERIAL:
1890 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
1891 return get_serial_info(mos7720_port,
1892 (struct serial_struct __user *)arg);
1893 }
1894
1895 return -ENOIOCTLCMD;
1896 }
1897
1898 static int mos7720_startup(struct usb_serial *serial)
1899 {
1900 struct usb_device *dev;
1901 char data;
1902 u16 product;
1903 int ret_val;
1904
1905 product = le16_to_cpu(serial->dev->descriptor.idProduct);
1906 dev = serial->dev;
1907
1908 /* setting configuration feature to one */
1909 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1910 (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5000);
1911
1912 if (product == MOSCHIP_DEVICE_ID_7715) {
1913 struct urb *urb = serial->port[0]->interrupt_in_urb;
1914
1915 urb->complete = mos7715_interrupt_callback;
1916
1917 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
1918 ret_val = mos7715_parport_init(serial);
1919 if (ret_val < 0)
1920 return ret_val;
1921 #endif
1922 }
1923 /* start the interrupt urb */
1924 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL);
1925 if (ret_val) {
1926 dev_err(&dev->dev, "failed to submit interrupt urb: %d\n",
1927 ret_val);
1928 }
1929
1930 /* LSR For Port 1 */
1931 read_mos_reg(serial, 0, MOS7720_LSR, &data);
1932 dev_dbg(&dev->dev, "LSR:%x\n", data);
1933
1934 return 0;
1935 }
1936
1937 static void mos7720_release(struct usb_serial *serial)
1938 {
1939 usb_kill_urb(serial->port[0]->interrupt_in_urb);
1940
1941 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
1942 /* close the parallel port */
1943
1944 if (le16_to_cpu(serial->dev->descriptor.idProduct)
1945 == MOSCHIP_DEVICE_ID_7715) {
1946 struct urbtracker *urbtrack;
1947 unsigned long flags;
1948 struct mos7715_parport *mos_parport =
1949 usb_get_serial_data(serial);
1950
1951 /* prevent NULL ptr dereference in port callbacks */
1952 spin_lock(&release_lock);
1953 mos_parport->pp->private_data = NULL;
1954 spin_unlock(&release_lock);
1955
1956 /* wait for synchronous usb calls to return */
1957 if (mos_parport->msg_pending)
1958 wait_for_completion_timeout(&mos_parport->syncmsg_compl,
1959 msecs_to_jiffies(MOS_WDR_TIMEOUT));
1960
1961 parport_remove_port(mos_parport->pp);
1962 usb_set_serial_data(serial, NULL);
1963 mos_parport->serial = NULL;
1964
1965 /* if tasklet currently scheduled, wait for it to complete */
1966 tasklet_kill(&mos_parport->urb_tasklet);
1967
1968 /* unlink any urbs sent by the tasklet */
1969 spin_lock_irqsave(&mos_parport->listlock, flags);
1970 list_for_each_entry(urbtrack,
1971 &mos_parport->active_urbs,
1972 urblist_entry)
1973 usb_unlink_urb(urbtrack->urb);
1974 spin_unlock_irqrestore(&mos_parport->listlock, flags);
1975 parport_del_port(mos_parport->pp);
1976
1977 kref_put(&mos_parport->ref_count, destroy_mos_parport);
1978 }
1979 #endif
1980 }
1981
1982 static int mos7720_port_probe(struct usb_serial_port *port)
1983 {
1984 struct moschip_port *mos7720_port;
1985
1986 mos7720_port = kzalloc(sizeof(*mos7720_port), GFP_KERNEL);
1987 if (!mos7720_port)
1988 return -ENOMEM;
1989
1990 mos7720_port->port = port;
1991
1992 usb_set_serial_port_data(port, mos7720_port);
1993
1994 return 0;
1995 }
1996
1997 static int mos7720_port_remove(struct usb_serial_port *port)
1998 {
1999 struct moschip_port *mos7720_port;
2000
2001 mos7720_port = usb_get_serial_port_data(port);
2002 kfree(mos7720_port);
2003
2004 return 0;
2005 }
2006
2007 static struct usb_serial_driver moschip7720_2port_driver = {
2008 .driver = {
2009 .owner = THIS_MODULE,
2010 .name = "moschip7720",
2011 },
2012 .description = "Moschip 2 port adapter",
2013 .id_table = id_table,
2014 .num_bulk_in = 2,
2015 .num_bulk_out = 2,
2016 .num_interrupt_in = 1,
2017 .calc_num_ports = mos77xx_calc_num_ports,
2018 .open = mos7720_open,
2019 .close = mos7720_close,
2020 .throttle = mos7720_throttle,
2021 .unthrottle = mos7720_unthrottle,
2022 .attach = mos7720_startup,
2023 .release = mos7720_release,
2024 .port_probe = mos7720_port_probe,
2025 .port_remove = mos7720_port_remove,
2026 .ioctl = mos7720_ioctl,
2027 .tiocmget = mos7720_tiocmget,
2028 .tiocmset = mos7720_tiocmset,
2029 .set_termios = mos7720_set_termios,
2030 .write = mos7720_write,
2031 .write_room = mos7720_write_room,
2032 .chars_in_buffer = mos7720_chars_in_buffer,
2033 .break_ctl = mos7720_break,
2034 .read_bulk_callback = mos7720_bulk_in_callback,
2035 .read_int_callback = mos7720_interrupt_callback,
2036 };
2037
2038 static struct usb_serial_driver * const serial_drivers[] = {
2039 &moschip7720_2port_driver, NULL
2040 };
2041
2042 module_usb_serial_driver(serial_drivers, id_table);
2043
2044 MODULE_AUTHOR(DRIVER_AUTHOR);
2045 MODULE_DESCRIPTION(DRIVER_DESC);
2046 MODULE_LICENSE("GPL");
CRIS linux kernel tree