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22818fb765e0c0026c57b2e532c32b5ce0bfa7b8
[deliverable/linux.git] / drivers / usb / serial / mos7720.c
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 (HZ * 5)
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 async_icount icount;
66 struct usb_serial_port *port; /* loop back to the owner */
67 struct urb *write_urb_pool[NUM_URBS];
68 };
69
70 static struct usb_serial_driver moschip7720_2port_driver;
71
72 #define USB_VENDOR_ID_MOSCHIP 0x9710
73 #define MOSCHIP_DEVICE_ID_7720 0x7720
74 #define MOSCHIP_DEVICE_ID_7715 0x7715
75
76 static const struct usb_device_id id_table[] = {
77 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7720) },
78 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7715) },
79 { } /* terminating entry */
80 };
81 MODULE_DEVICE_TABLE(usb, id_table);
82
83 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
84
85 /* initial values for parport regs */
86 #define DCR_INIT_VAL 0x0c /* SLCTIN, nINIT */
87 #define ECR_INIT_VAL 0x00 /* SPP mode */
88
89 struct urbtracker {
90 struct mos7715_parport *mos_parport;
91 struct list_head urblist_entry;
92 struct kref ref_count;
93 struct urb *urb;
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 int status = usb_control_msg(usbdev, pipe, request, requesttype, value,
232 index, data, 1, MOS_WDR_TIMEOUT);
233 if (status < 0)
234 dev_err(&usbdev->dev,
235 "mos7720: usb_control_msg() failed: %d", status);
236 return status;
237 }
238
239 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
240
241 static inline int mos7715_change_mode(struct mos7715_parport *mos_parport,
242 enum mos7715_pp_modes mode)
243 {
244 mos_parport->shadowECR = mode;
245 write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR);
246 return 0;
247 }
248
249 static void destroy_mos_parport(struct kref *kref)
250 {
251 struct mos7715_parport *mos_parport =
252 container_of(kref, struct mos7715_parport, ref_count);
253
254 kfree(mos_parport);
255 }
256
257 static void destroy_urbtracker(struct kref *kref)
258 {
259 struct urbtracker *urbtrack =
260 container_of(kref, struct urbtracker, ref_count);
261 struct mos7715_parport *mos_parport = urbtrack->mos_parport;
262
263 usb_free_urb(urbtrack->urb);
264 kfree(urbtrack);
265 kref_put(&mos_parport->ref_count, destroy_mos_parport);
266 }
267
268 /*
269 * This runs as a tasklet when sending an urb in a non-blocking parallel
270 * port callback had to be deferred because the disconnect mutex could not be
271 * obtained at the time.
272 */
273 static void send_deferred_urbs(unsigned long _mos_parport)
274 {
275 int ret_val;
276 unsigned long flags;
277 struct mos7715_parport *mos_parport = (void *)_mos_parport;
278 struct urbtracker *urbtrack, *tmp;
279 struct list_head *cursor, *next;
280 struct device *dev;
281
282 /* if release function ran, game over */
283 if (unlikely(mos_parport->serial == NULL))
284 return;
285
286 dev = &mos_parport->serial->dev->dev;
287
288 /* try again to get the mutex */
289 if (!mutex_trylock(&mos_parport->serial->disc_mutex)) {
290 dev_dbg(dev, "%s: rescheduling tasklet\n", __func__);
291 tasklet_schedule(&mos_parport->urb_tasklet);
292 return;
293 }
294
295 /* if device disconnected, game over */
296 if (unlikely(mos_parport->serial->disconnected)) {
297 mutex_unlock(&mos_parport->serial->disc_mutex);
298 return;
299 }
300
301 spin_lock_irqsave(&mos_parport->listlock, flags);
302 if (list_empty(&mos_parport->deferred_urbs)) {
303 spin_unlock_irqrestore(&mos_parport->listlock, flags);
304 mutex_unlock(&mos_parport->serial->disc_mutex);
305 dev_dbg(dev, "%s: deferred_urbs list empty\n", __func__);
306 return;
307 }
308
309 /* move contents of deferred_urbs list to active_urbs list and submit */
310 list_for_each_safe(cursor, next, &mos_parport->deferred_urbs)
311 list_move_tail(cursor, &mos_parport->active_urbs);
312 list_for_each_entry_safe(urbtrack, tmp, &mos_parport->active_urbs,
313 urblist_entry) {
314 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
315 dev_dbg(dev, "%s: urb submitted\n", __func__);
316 if (ret_val) {
317 dev_err(dev, "usb_submit_urb() failed: %d\n", ret_val);
318 list_del(&urbtrack->urblist_entry);
319 kref_put(&urbtrack->ref_count, destroy_urbtracker);
320 }
321 }
322 spin_unlock_irqrestore(&mos_parport->listlock, flags);
323 mutex_unlock(&mos_parport->serial->disc_mutex);
324 }
325
326 /* callback for parallel port control urbs submitted asynchronously */
327 static void async_complete(struct urb *urb)
328 {
329 struct urbtracker *urbtrack = urb->context;
330 int status = urb->status;
331
332 if (unlikely(status))
333 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n", __func__, status);
334
335 /* remove the urbtracker from the active_urbs list */
336 spin_lock(&urbtrack->mos_parport->listlock);
337 list_del(&urbtrack->urblist_entry);
338 spin_unlock(&urbtrack->mos_parport->listlock);
339 kref_put(&urbtrack->ref_count, destroy_urbtracker);
340 }
341
342 static int write_parport_reg_nonblock(struct mos7715_parport *mos_parport,
343 enum mos_regs reg, __u8 data)
344 {
345 struct urbtracker *urbtrack;
346 int ret_val;
347 unsigned long flags;
348 struct usb_ctrlrequest setup;
349 struct usb_serial *serial = mos_parport->serial;
350 struct usb_device *usbdev = serial->dev;
351
352 /* create and initialize the control urb and containing urbtracker */
353 urbtrack = kmalloc(sizeof(struct urbtracker), GFP_ATOMIC);
354 if (urbtrack == NULL) {
355 dev_err(&usbdev->dev, "out of memory");
356 return -ENOMEM;
357 }
358 kref_get(&mos_parport->ref_count);
359 urbtrack->mos_parport = mos_parport;
360 urbtrack->urb = usb_alloc_urb(0, GFP_ATOMIC);
361 if (urbtrack->urb == NULL) {
362 dev_err(&usbdev->dev, "out of urbs");
363 kfree(urbtrack);
364 return -ENOMEM;
365 }
366 setup.bRequestType = (__u8)0x40;
367 setup.bRequest = (__u8)0x0e;
368 setup.wValue = get_reg_value(reg, dummy);
369 setup.wIndex = get_reg_index(reg);
370 setup.wLength = 0;
371 usb_fill_control_urb(urbtrack->urb, usbdev,
372 usb_sndctrlpipe(usbdev, 0),
373 (unsigned char *)&setup,
374 NULL, 0, async_complete, urbtrack);
375 kref_init(&urbtrack->ref_count);
376 INIT_LIST_HEAD(&urbtrack->urblist_entry);
377
378 /*
379 * get the disconnect mutex, or add tracker to the deferred_urbs list
380 * and schedule a tasklet to try again later
381 */
382 if (!mutex_trylock(&serial->disc_mutex)) {
383 spin_lock_irqsave(&mos_parport->listlock, flags);
384 list_add_tail(&urbtrack->urblist_entry,
385 &mos_parport->deferred_urbs);
386 spin_unlock_irqrestore(&mos_parport->listlock, flags);
387 tasklet_schedule(&mos_parport->urb_tasklet);
388 dev_dbg(&usbdev->dev, "tasklet scheduled");
389 return 0;
390 }
391
392 /* bail if device disconnected */
393 if (serial->disconnected) {
394 kref_put(&urbtrack->ref_count, destroy_urbtracker);
395 mutex_unlock(&serial->disc_mutex);
396 return -ENODEV;
397 }
398
399 /* add the tracker to the active_urbs list and submit */
400 spin_lock_irqsave(&mos_parport->listlock, flags);
401 list_add_tail(&urbtrack->urblist_entry, &mos_parport->active_urbs);
402 spin_unlock_irqrestore(&mos_parport->listlock, flags);
403 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
404 mutex_unlock(&serial->disc_mutex);
405 if (ret_val) {
406 dev_err(&usbdev->dev,
407 "%s: submit_urb() failed: %d", __func__, ret_val);
408 spin_lock_irqsave(&mos_parport->listlock, flags);
409 list_del(&urbtrack->urblist_entry);
410 spin_unlock_irqrestore(&mos_parport->listlock, flags);
411 kref_put(&urbtrack->ref_count, destroy_urbtracker);
412 return ret_val;
413 }
414 return 0;
415 }
416
417 /*
418 * This is the the common top part of all parallel port callback operations that
419 * send synchronous messages to the device. This implements convoluted locking
420 * that avoids two scenarios: (1) a port operation is called after usbserial
421 * has called our release function, at which point struct mos7715_parport has
422 * been destroyed, and (2) the device has been disconnected, but usbserial has
423 * not called the release function yet because someone has a serial port open.
424 * The shared release_lock prevents the first, and the mutex and disconnected
425 * flag maintained by usbserial covers the second. We also use the msg_pending
426 * flag to ensure that all synchronous usb messgage calls have completed before
427 * our release function can return.
428 */
429 static int parport_prologue(struct parport *pp)
430 {
431 struct mos7715_parport *mos_parport;
432
433 spin_lock(&release_lock);
434 mos_parport = pp->private_data;
435 if (unlikely(mos_parport == NULL)) {
436 /* release fn called, port struct destroyed */
437 spin_unlock(&release_lock);
438 return -1;
439 }
440 mos_parport->msg_pending = true; /* synch usb call pending */
441 INIT_COMPLETION(mos_parport->syncmsg_compl);
442 spin_unlock(&release_lock);
443
444 mutex_lock(&mos_parport->serial->disc_mutex);
445 if (mos_parport->serial->disconnected) {
446 /* device disconnected */
447 mutex_unlock(&mos_parport->serial->disc_mutex);
448 mos_parport->msg_pending = false;
449 complete(&mos_parport->syncmsg_compl);
450 return -1;
451 }
452
453 return 0;
454 }
455
456 /*
457 * This is the the common bottom part of all parallel port functions that send
458 * synchronous messages to the device.
459 */
460 static inline void parport_epilogue(struct parport *pp)
461 {
462 struct mos7715_parport *mos_parport = pp->private_data;
463 mutex_unlock(&mos_parport->serial->disc_mutex);
464 mos_parport->msg_pending = false;
465 complete(&mos_parport->syncmsg_compl);
466 }
467
468 static void parport_mos7715_write_data(struct parport *pp, unsigned char d)
469 {
470 struct mos7715_parport *mos_parport = pp->private_data;
471
472 if (parport_prologue(pp) < 0)
473 return;
474 mos7715_change_mode(mos_parport, SPP);
475 write_mos_reg(mos_parport->serial, dummy, DPR, (__u8)d);
476 parport_epilogue(pp);
477 }
478
479 static unsigned char parport_mos7715_read_data(struct parport *pp)
480 {
481 struct mos7715_parport *mos_parport = pp->private_data;
482 unsigned char d;
483
484 if (parport_prologue(pp) < 0)
485 return 0;
486 read_mos_reg(mos_parport->serial, dummy, DPR, &d);
487 parport_epilogue(pp);
488 return d;
489 }
490
491 static void parport_mos7715_write_control(struct parport *pp, unsigned char d)
492 {
493 struct mos7715_parport *mos_parport = pp->private_data;
494 __u8 data;
495
496 if (parport_prologue(pp) < 0)
497 return;
498 data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0);
499 write_mos_reg(mos_parport->serial, dummy, DCR, data);
500 mos_parport->shadowDCR = data;
501 parport_epilogue(pp);
502 }
503
504 static unsigned char parport_mos7715_read_control(struct parport *pp)
505 {
506 struct mos7715_parport *mos_parport = pp->private_data;
507 __u8 dcr;
508
509 spin_lock(&release_lock);
510 mos_parport = pp->private_data;
511 if (unlikely(mos_parport == NULL)) {
512 spin_unlock(&release_lock);
513 return 0;
514 }
515 dcr = mos_parport->shadowDCR & 0x0f;
516 spin_unlock(&release_lock);
517 return dcr;
518 }
519
520 static unsigned char parport_mos7715_frob_control(struct parport *pp,
521 unsigned char mask,
522 unsigned char val)
523 {
524 struct mos7715_parport *mos_parport = pp->private_data;
525 __u8 dcr;
526
527 mask &= 0x0f;
528 val &= 0x0f;
529 if (parport_prologue(pp) < 0)
530 return 0;
531 mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val;
532 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
533 dcr = mos_parport->shadowDCR & 0x0f;
534 parport_epilogue(pp);
535 return dcr;
536 }
537
538 static unsigned char parport_mos7715_read_status(struct parport *pp)
539 {
540 unsigned char status;
541 struct mos7715_parport *mos_parport = pp->private_data;
542
543 spin_lock(&release_lock);
544 mos_parport = pp->private_data;
545 if (unlikely(mos_parport == NULL)) { /* release called */
546 spin_unlock(&release_lock);
547 return 0;
548 }
549 status = atomic_read(&mos_parport->shadowDSR) & 0xf8;
550 spin_unlock(&release_lock);
551 return status;
552 }
553
554 static void parport_mos7715_enable_irq(struct parport *pp)
555 {
556 }
557
558 static void parport_mos7715_disable_irq(struct parport *pp)
559 {
560 }
561
562 static void parport_mos7715_data_forward(struct parport *pp)
563 {
564 struct mos7715_parport *mos_parport = pp->private_data;
565
566 if (parport_prologue(pp) < 0)
567 return;
568 mos7715_change_mode(mos_parport, PS2);
569 mos_parport->shadowDCR &= ~0x20;
570 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
571 parport_epilogue(pp);
572 }
573
574 static void parport_mos7715_data_reverse(struct parport *pp)
575 {
576 struct mos7715_parport *mos_parport = pp->private_data;
577
578 if (parport_prologue(pp) < 0)
579 return;
580 mos7715_change_mode(mos_parport, PS2);
581 mos_parport->shadowDCR |= 0x20;
582 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
583 parport_epilogue(pp);
584 }
585
586 static void parport_mos7715_init_state(struct pardevice *dev,
587 struct parport_state *s)
588 {
589 s->u.pc.ctr = DCR_INIT_VAL;
590 s->u.pc.ecr = ECR_INIT_VAL;
591 }
592
593 /* N.B. Parport core code requires that this function not block */
594 static void parport_mos7715_save_state(struct parport *pp,
595 struct parport_state *s)
596 {
597 struct mos7715_parport *mos_parport;
598
599 spin_lock(&release_lock);
600 mos_parport = pp->private_data;
601 if (unlikely(mos_parport == NULL)) { /* release called */
602 spin_unlock(&release_lock);
603 return;
604 }
605 s->u.pc.ctr = mos_parport->shadowDCR;
606 s->u.pc.ecr = mos_parport->shadowECR;
607 spin_unlock(&release_lock);
608 }
609
610 /* N.B. Parport core code requires that this function not block */
611 static void parport_mos7715_restore_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 write_parport_reg_nonblock(mos_parport, DCR, mos_parport->shadowDCR);
623 write_parport_reg_nonblock(mos_parport, ECR, mos_parport->shadowECR);
624 spin_unlock(&release_lock);
625 }
626
627 static size_t parport_mos7715_write_compat(struct parport *pp,
628 const void *buffer,
629 size_t len, int flags)
630 {
631 int retval;
632 struct mos7715_parport *mos_parport = pp->private_data;
633 int actual_len;
634
635 if (parport_prologue(pp) < 0)
636 return 0;
637 mos7715_change_mode(mos_parport, PPF);
638 retval = usb_bulk_msg(mos_parport->serial->dev,
639 usb_sndbulkpipe(mos_parport->serial->dev, 2),
640 (void *)buffer, len, &actual_len,
641 MOS_WDR_TIMEOUT);
642 parport_epilogue(pp);
643 if (retval) {
644 dev_err(&mos_parport->serial->dev->dev,
645 "mos7720: usb_bulk_msg() failed: %d", retval);
646 return 0;
647 }
648 return actual_len;
649 }
650
651 static struct parport_operations parport_mos7715_ops = {
652 .owner = THIS_MODULE,
653 .write_data = parport_mos7715_write_data,
654 .read_data = parport_mos7715_read_data,
655
656 .write_control = parport_mos7715_write_control,
657 .read_control = parport_mos7715_read_control,
658 .frob_control = parport_mos7715_frob_control,
659
660 .read_status = parport_mos7715_read_status,
661
662 .enable_irq = parport_mos7715_enable_irq,
663 .disable_irq = parport_mos7715_disable_irq,
664
665 .data_forward = parport_mos7715_data_forward,
666 .data_reverse = parport_mos7715_data_reverse,
667
668 .init_state = parport_mos7715_init_state,
669 .save_state = parport_mos7715_save_state,
670 .restore_state = parport_mos7715_restore_state,
671
672 .compat_write_data = parport_mos7715_write_compat,
673
674 .nibble_read_data = parport_ieee1284_read_nibble,
675 .byte_read_data = parport_ieee1284_read_byte,
676 };
677
678 /*
679 * Allocate and initialize parallel port control struct, initialize
680 * the parallel port hardware device, and register with the parport subsystem.
681 */
682 static int mos7715_parport_init(struct usb_serial *serial)
683 {
684 struct mos7715_parport *mos_parport;
685
686 /* allocate and initialize parallel port control struct */
687 mos_parport = kzalloc(sizeof(struct mos7715_parport), GFP_KERNEL);
688 if (mos_parport == NULL) {
689 dev_dbg(&serial->dev->dev, "%s: kzalloc failed\n", __func__);
690 return -ENOMEM;
691 }
692 mos_parport->msg_pending = false;
693 kref_init(&mos_parport->ref_count);
694 spin_lock_init(&mos_parport->listlock);
695 INIT_LIST_HEAD(&mos_parport->active_urbs);
696 INIT_LIST_HEAD(&mos_parport->deferred_urbs);
697 usb_set_serial_data(serial, mos_parport); /* hijack private pointer */
698 mos_parport->serial = serial;
699 tasklet_init(&mos_parport->urb_tasklet, send_deferred_urbs,
700 (unsigned long) mos_parport);
701 init_completion(&mos_parport->syncmsg_compl);
702
703 /* cycle parallel port reset bit */
704 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x80);
705 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x00);
706
707 /* initialize device registers */
708 mos_parport->shadowDCR = DCR_INIT_VAL;
709 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
710 mos_parport->shadowECR = ECR_INIT_VAL;
711 write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR);
712
713 /* register with parport core */
714 mos_parport->pp = parport_register_port(0, PARPORT_IRQ_NONE,
715 PARPORT_DMA_NONE,
716 &parport_mos7715_ops);
717 if (mos_parport->pp == NULL) {
718 dev_err(&serial->interface->dev,
719 "Could not register parport\n");
720 kref_put(&mos_parport->ref_count, destroy_mos_parport);
721 return -EIO;
722 }
723 mos_parport->pp->private_data = mos_parport;
724 mos_parport->pp->modes = PARPORT_MODE_COMPAT | PARPORT_MODE_PCSPP;
725 mos_parport->pp->dev = &serial->interface->dev;
726 parport_announce_port(mos_parport->pp);
727
728 return 0;
729 }
730 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
731
732 /*
733 * mos7720_interrupt_callback
734 * this is the callback function for when we have received data on the
735 * interrupt endpoint.
736 */
737 static void mos7720_interrupt_callback(struct urb *urb)
738 {
739 int result;
740 int length;
741 int status = urb->status;
742 struct device *dev = &urb->dev->dev;
743 __u8 *data;
744 __u8 sp1;
745 __u8 sp2;
746
747 switch (status) {
748 case 0:
749 /* success */
750 break;
751 case -ECONNRESET:
752 case -ENOENT:
753 case -ESHUTDOWN:
754 /* this urb is terminated, clean up */
755 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
756 return;
757 default:
758 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
759 goto exit;
760 }
761
762 length = urb->actual_length;
763 data = urb->transfer_buffer;
764
765 /* Moschip get 4 bytes
766 * Byte 1 IIR Port 1 (port.number is 0)
767 * Byte 2 IIR Port 2 (port.number is 1)
768 * Byte 3 --------------
769 * Byte 4 FIFO status for both */
770
771 /* the above description is inverted
772 * oneukum 2007-03-14 */
773
774 if (unlikely(length != 4)) {
775 dev_dbg(dev, "Wrong data !!!\n");
776 return;
777 }
778
779 sp1 = data[3];
780 sp2 = data[2];
781
782 if ((sp1 | sp2) & 0x01) {
783 /* No Interrupt Pending in both the ports */
784 dev_dbg(dev, "No Interrupt !!!\n");
785 } else {
786 switch (sp1 & 0x0f) {
787 case SERIAL_IIR_RLS:
788 dev_dbg(dev, "Serial Port 1: Receiver status error or address bit detected in 9-bit mode\n");
789 break;
790 case SERIAL_IIR_CTI:
791 dev_dbg(dev, "Serial Port 1: Receiver time out\n");
792 break;
793 case SERIAL_IIR_MS:
794 /* dev_dbg(dev, "Serial Port 1: Modem status change\n"); */
795 break;
796 }
797
798 switch (sp2 & 0x0f) {
799 case SERIAL_IIR_RLS:
800 dev_dbg(dev, "Serial Port 2: Receiver status error or address bit detected in 9-bit mode\n");
801 break;
802 case SERIAL_IIR_CTI:
803 dev_dbg(dev, "Serial Port 2: Receiver time out\n");
804 break;
805 case SERIAL_IIR_MS:
806 /* dev_dbg(dev, "Serial Port 2: Modem status change\n"); */
807 break;
808 }
809 }
810
811 exit:
812 result = usb_submit_urb(urb, GFP_ATOMIC);
813 if (result)
814 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result);
815 }
816
817 /*
818 * mos7715_interrupt_callback
819 * this is the 7715's callback function for when we have received data on
820 * the interrupt endpoint.
821 */
822 static void mos7715_interrupt_callback(struct urb *urb)
823 {
824 int result;
825 int length;
826 int status = urb->status;
827 struct device *dev = &urb->dev->dev;
828 __u8 *data;
829 __u8 iir;
830
831 switch (status) {
832 case 0:
833 /* success */
834 break;
835 case -ECONNRESET:
836 case -ENOENT:
837 case -ESHUTDOWN:
838 case -ENODEV:
839 /* this urb is terminated, clean up */
840 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
841 return;
842 default:
843 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
844 goto exit;
845 }
846
847 length = urb->actual_length;
848 data = urb->transfer_buffer;
849
850 /* Structure of data from 7715 device:
851 * Byte 1: IIR serial Port
852 * Byte 2: unused
853 * Byte 2: DSR parallel port
854 * Byte 4: FIFO status for both */
855
856 if (unlikely(length != 4)) {
857 dev_dbg(dev, "Wrong data !!!\n");
858 return;
859 }
860
861 iir = data[0];
862 if (!(iir & 0x01)) { /* serial port interrupt pending */
863 switch (iir & 0x0f) {
864 case SERIAL_IIR_RLS:
865 dev_dbg(dev, "Serial Port: Receiver status error or address bit detected in 9-bit mode\n\n");
866 break;
867 case SERIAL_IIR_CTI:
868 dev_dbg(dev, "Serial Port: Receiver time out\n");
869 break;
870 case SERIAL_IIR_MS:
871 /* dev_dbg(dev, "Serial Port: Modem status change\n"); */
872 break;
873 }
874 }
875
876 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
877 { /* update local copy of DSR reg */
878 struct usb_serial_port *port = urb->context;
879 struct mos7715_parport *mos_parport = port->serial->private;
880 if (unlikely(mos_parport == NULL))
881 return;
882 atomic_set(&mos_parport->shadowDSR, data[2]);
883 }
884 #endif
885
886 exit:
887 result = usb_submit_urb(urb, GFP_ATOMIC);
888 if (result)
889 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result);
890 }
891
892 /*
893 * mos7720_bulk_in_callback
894 * this is the callback function for when we have received data on the
895 * bulk in endpoint.
896 */
897 static void mos7720_bulk_in_callback(struct urb *urb)
898 {
899 int retval;
900 unsigned char *data ;
901 struct usb_serial_port *port;
902 struct tty_struct *tty;
903 int status = urb->status;
904
905 if (status) {
906 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
907 return;
908 }
909
910 port = urb->context;
911
912 dev_dbg(&port->dev, "Entering...%s\n", __func__);
913
914 data = urb->transfer_buffer;
915
916 tty = tty_port_tty_get(&port->port);
917 if (tty && urb->actual_length) {
918 tty_insert_flip_string(&port->port, data, urb->actual_length);
919 tty_flip_buffer_push(tty);
920 }
921 tty_kref_put(tty);
922
923 if (port->read_urb->status != -EINPROGRESS) {
924 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
925 if (retval)
926 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
927 }
928 }
929
930 /*
931 * mos7720_bulk_out_data_callback
932 * this is the callback function for when we have finished sending serial
933 * data on the bulk out endpoint.
934 */
935 static void mos7720_bulk_out_data_callback(struct urb *urb)
936 {
937 struct moschip_port *mos7720_port;
938 struct tty_struct *tty;
939 int status = urb->status;
940
941 if (status) {
942 dev_dbg(&urb->dev->dev, "nonzero write bulk status received:%d\n", status);
943 return;
944 }
945
946 mos7720_port = urb->context;
947 if (!mos7720_port) {
948 dev_dbg(&urb->dev->dev, "NULL mos7720_port pointer\n");
949 return ;
950 }
951
952 tty = tty_port_tty_get(&mos7720_port->port->port);
953
954 if (tty && mos7720_port->open)
955 tty_wakeup(tty);
956 tty_kref_put(tty);
957 }
958
959 /*
960 * mos77xx_probe
961 * this function installs the appropriate read interrupt endpoint callback
962 * depending on whether the device is a 7720 or 7715, thus avoiding costly
963 * run-time checks in the high-frequency callback routine itself.
964 */
965 static int mos77xx_probe(struct usb_serial *serial,
966 const struct usb_device_id *id)
967 {
968 if (id->idProduct == MOSCHIP_DEVICE_ID_7715)
969 moschip7720_2port_driver.read_int_callback =
970 mos7715_interrupt_callback;
971 else
972 moschip7720_2port_driver.read_int_callback =
973 mos7720_interrupt_callback;
974
975 return 0;
976 }
977
978 static int mos77xx_calc_num_ports(struct usb_serial *serial)
979 {
980 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
981 if (product == MOSCHIP_DEVICE_ID_7715)
982 return 1;
983
984 return 2;
985 }
986
987 static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port)
988 {
989 struct usb_serial *serial;
990 struct urb *urb;
991 struct moschip_port *mos7720_port;
992 int response;
993 int port_number;
994 __u8 data;
995 int allocated_urbs = 0;
996 int j;
997
998 serial = port->serial;
999
1000 mos7720_port = usb_get_serial_port_data(port);
1001 if (mos7720_port == NULL)
1002 return -ENODEV;
1003
1004 usb_clear_halt(serial->dev, port->write_urb->pipe);
1005 usb_clear_halt(serial->dev, port->read_urb->pipe);
1006
1007 /* Initialising the write urb pool */
1008 for (j = 0; j < NUM_URBS; ++j) {
1009 urb = usb_alloc_urb(0, GFP_KERNEL);
1010 mos7720_port->write_urb_pool[j] = urb;
1011
1012 if (urb == NULL) {
1013 dev_err(&port->dev, "No more urbs???\n");
1014 continue;
1015 }
1016
1017 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1018 GFP_KERNEL);
1019 if (!urb->transfer_buffer) {
1020 dev_err(&port->dev,
1021 "%s-out of memory for urb buffers.\n",
1022 __func__);
1023 usb_free_urb(mos7720_port->write_urb_pool[j]);
1024 mos7720_port->write_urb_pool[j] = NULL;
1025 continue;
1026 }
1027 allocated_urbs++;
1028 }
1029
1030 if (!allocated_urbs)
1031 return -ENOMEM;
1032
1033 /* Initialize MCS7720 -- Write Init values to corresponding Registers
1034 *
1035 * Register Index
1036 * 0 : THR/RHR
1037 * 1 : IER
1038 * 2 : FCR
1039 * 3 : LCR
1040 * 4 : MCR
1041 * 5 : LSR
1042 * 6 : MSR
1043 * 7 : SPR
1044 *
1045 * 0x08 : SP1/2 Control Reg
1046 */
1047 port_number = port->number - port->serial->minor;
1048 read_mos_reg(serial, port_number, LSR, &data);
1049
1050 dev_dbg(&port->dev, "SS::%p LSR:%x\n", mos7720_port, data);
1051
1052 write_mos_reg(serial, dummy, SP1_REG, 0x02);
1053 write_mos_reg(serial, dummy, SP2_REG, 0x02);
1054
1055 write_mos_reg(serial, port_number, IER, 0x00);
1056 write_mos_reg(serial, port_number, FCR, 0x00);
1057
1058 write_mos_reg(serial, port_number, FCR, 0xcf);
1059 mos7720_port->shadowLCR = 0x03;
1060 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1061 mos7720_port->shadowMCR = 0x0b;
1062 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1063
1064 write_mos_reg(serial, port_number, SP_CONTROL_REG, 0x00);
1065 read_mos_reg(serial, dummy, SP_CONTROL_REG, &data);
1066 data = data | (port->number - port->serial->minor + 1);
1067 write_mos_reg(serial, dummy, SP_CONTROL_REG, data);
1068 mos7720_port->shadowLCR = 0x83;
1069 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1070 write_mos_reg(serial, port_number, THR, 0x0c);
1071 write_mos_reg(serial, port_number, IER, 0x00);
1072 mos7720_port->shadowLCR = 0x03;
1073 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1074 write_mos_reg(serial, port_number, IER, 0x0c);
1075
1076 response = usb_submit_urb(port->read_urb, GFP_KERNEL);
1077 if (response)
1078 dev_err(&port->dev, "%s - Error %d submitting read urb\n",
1079 __func__, response);
1080
1081 /* initialize our icount structure */
1082 memset(&(mos7720_port->icount), 0x00, sizeof(mos7720_port->icount));
1083
1084 /* initialize our port settings */
1085 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */
1086
1087 /* send a open port command */
1088 mos7720_port->open = 1;
1089
1090 return 0;
1091 }
1092
1093 /*
1094 * mos7720_chars_in_buffer
1095 * this function is called by the tty driver when it wants to know how many
1096 * bytes of data we currently have outstanding in the port (data that has
1097 * been written, but hasn't made it out the port yet)
1098 * If successful, we return the number of bytes left to be written in the
1099 * system,
1100 * Otherwise we return a negative error number.
1101 */
1102 static int mos7720_chars_in_buffer(struct tty_struct *tty)
1103 {
1104 struct usb_serial_port *port = tty->driver_data;
1105 int i;
1106 int chars = 0;
1107 struct moschip_port *mos7720_port;
1108
1109 mos7720_port = usb_get_serial_port_data(port);
1110 if (mos7720_port == NULL)
1111 return 0;
1112
1113 for (i = 0; i < NUM_URBS; ++i) {
1114 if (mos7720_port->write_urb_pool[i] &&
1115 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS)
1116 chars += URB_TRANSFER_BUFFER_SIZE;
1117 }
1118 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1119 return chars;
1120 }
1121
1122 static void mos7720_close(struct usb_serial_port *port)
1123 {
1124 struct usb_serial *serial;
1125 struct moschip_port *mos7720_port;
1126 int j;
1127
1128 serial = port->serial;
1129
1130 mos7720_port = usb_get_serial_port_data(port);
1131 if (mos7720_port == NULL)
1132 return;
1133
1134 for (j = 0; j < NUM_URBS; ++j)
1135 usb_kill_urb(mos7720_port->write_urb_pool[j]);
1136
1137 /* Freeing Write URBs */
1138 for (j = 0; j < NUM_URBS; ++j) {
1139 if (mos7720_port->write_urb_pool[j]) {
1140 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer);
1141 usb_free_urb(mos7720_port->write_urb_pool[j]);
1142 }
1143 }
1144
1145 /* While closing port, shutdown all bulk read, write *
1146 * and interrupt read if they exists, otherwise nop */
1147 usb_kill_urb(port->write_urb);
1148 usb_kill_urb(port->read_urb);
1149
1150 mutex_lock(&serial->disc_mutex);
1151 /* these commands must not be issued if the device has
1152 * been disconnected */
1153 if (!serial->disconnected) {
1154 write_mos_reg(serial, port->number - port->serial->minor,
1155 MCR, 0x00);
1156 write_mos_reg(serial, port->number - port->serial->minor,
1157 IER, 0x00);
1158 }
1159 mutex_unlock(&serial->disc_mutex);
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->number - port->serial->minor,
1183 LCR, mos7720_port->shadowLCR);
1184 }
1185
1186 /*
1187 * mos7720_write_room
1188 * this function is called by the tty driver when it wants to know how many
1189 * bytes of data we can accept for a specific port.
1190 * If successful, we return the amount of room that we have for this port
1191 * Otherwise we return a negative error number.
1192 */
1193 static int mos7720_write_room(struct tty_struct *tty)
1194 {
1195 struct usb_serial_port *port = tty->driver_data;
1196 struct moschip_port *mos7720_port;
1197 int room = 0;
1198 int i;
1199
1200 mos7720_port = usb_get_serial_port_data(port);
1201 if (mos7720_port == NULL)
1202 return -ENODEV;
1203
1204 /* FIXME: Locking */
1205 for (i = 0; i < NUM_URBS; ++i) {
1206 if (mos7720_port->write_urb_pool[i] &&
1207 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS)
1208 room += URB_TRANSFER_BUFFER_SIZE;
1209 }
1210
1211 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
1212 return room;
1213 }
1214
1215 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port,
1216 const unsigned char *data, int count)
1217 {
1218 int status;
1219 int i;
1220 int bytes_sent = 0;
1221 int transfer_size;
1222
1223 struct moschip_port *mos7720_port;
1224 struct usb_serial *serial;
1225 struct urb *urb;
1226 const unsigned char *current_position = data;
1227
1228 serial = port->serial;
1229
1230 mos7720_port = usb_get_serial_port_data(port);
1231 if (mos7720_port == NULL)
1232 return -ENODEV;
1233
1234 /* try to find a free urb in the list */
1235 urb = NULL;
1236
1237 for (i = 0; i < NUM_URBS; ++i) {
1238 if (mos7720_port->write_urb_pool[i] &&
1239 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) {
1240 urb = mos7720_port->write_urb_pool[i];
1241 dev_dbg(&port->dev, "URB:%d\n", i);
1242 break;
1243 }
1244 }
1245
1246 if (urb == NULL) {
1247 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1248 goto exit;
1249 }
1250
1251 if (urb->transfer_buffer == NULL) {
1252 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1253 GFP_KERNEL);
1254 if (urb->transfer_buffer == NULL) {
1255 dev_err_console(port, "%s no more kernel memory...\n",
1256 __func__);
1257 goto exit;
1258 }
1259 }
1260 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1261
1262 memcpy(urb->transfer_buffer, current_position, transfer_size);
1263 usb_serial_debug_data(&port->dev, __func__, transfer_size,
1264 urb->transfer_buffer);
1265
1266 /* fill urb with data and submit */
1267 usb_fill_bulk_urb(urb, serial->dev,
1268 usb_sndbulkpipe(serial->dev,
1269 port->bulk_out_endpointAddress),
1270 urb->transfer_buffer, transfer_size,
1271 mos7720_bulk_out_data_callback, mos7720_port);
1272
1273 /* send it down the pipe */
1274 status = usb_submit_urb(urb, GFP_ATOMIC);
1275 if (status) {
1276 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1277 "with status = %d\n", __func__, status);
1278 bytes_sent = status;
1279 goto exit;
1280 }
1281 bytes_sent = transfer_size;
1282
1283 exit:
1284 return bytes_sent;
1285 }
1286
1287 static void mos7720_throttle(struct tty_struct *tty)
1288 {
1289 struct usb_serial_port *port = tty->driver_data;
1290 struct moschip_port *mos7720_port;
1291 int status;
1292
1293 mos7720_port = usb_get_serial_port_data(port);
1294
1295 if (mos7720_port == NULL)
1296 return;
1297
1298 if (!mos7720_port->open) {
1299 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1300 return;
1301 }
1302
1303 /* if we are implementing XON/XOFF, send the stop character */
1304 if (I_IXOFF(tty)) {
1305 unsigned char stop_char = STOP_CHAR(tty);
1306 status = mos7720_write(tty, port, &stop_char, 1);
1307 if (status <= 0)
1308 return;
1309 }
1310
1311 /* if we are implementing RTS/CTS, toggle that line */
1312 if (tty->termios.c_cflag & CRTSCTS) {
1313 mos7720_port->shadowMCR &= ~UART_MCR_RTS;
1314 write_mos_reg(port->serial, port->number - port->serial->minor,
1315 MCR, mos7720_port->shadowMCR);
1316 if (status != 0)
1317 return;
1318 }
1319 }
1320
1321 static void mos7720_unthrottle(struct tty_struct *tty)
1322 {
1323 struct usb_serial_port *port = tty->driver_data;
1324 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1325 int status;
1326
1327 if (mos7720_port == NULL)
1328 return;
1329
1330 if (!mos7720_port->open) {
1331 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1332 return;
1333 }
1334
1335 /* if we are implementing XON/XOFF, send the start character */
1336 if (I_IXOFF(tty)) {
1337 unsigned char start_char = START_CHAR(tty);
1338 status = mos7720_write(tty, port, &start_char, 1);
1339 if (status <= 0)
1340 return;
1341 }
1342
1343 /* if we are implementing RTS/CTS, toggle that line */
1344 if (tty->termios.c_cflag & CRTSCTS) {
1345 mos7720_port->shadowMCR |= UART_MCR_RTS;
1346 write_mos_reg(port->serial, port->number - port->serial->minor,
1347 MCR, mos7720_port->shadowMCR);
1348 if (status != 0)
1349 return;
1350 }
1351 }
1352
1353 /* FIXME: this function does not work */
1354 static int set_higher_rates(struct moschip_port *mos7720_port,
1355 unsigned int baud)
1356 {
1357 struct usb_serial_port *port;
1358 struct usb_serial *serial;
1359 int port_number;
1360 enum mos_regs sp_reg;
1361 if (mos7720_port == NULL)
1362 return -EINVAL;
1363
1364 port = mos7720_port->port;
1365 serial = port->serial;
1366
1367 /***********************************************
1368 * Init Sequence for higher rates
1369 ***********************************************/
1370 dev_dbg(&port->dev, "Sending Setting Commands ..........\n");
1371 port_number = port->number - port->serial->minor;
1372
1373 write_mos_reg(serial, port_number, IER, 0x00);
1374 write_mos_reg(serial, port_number, FCR, 0x00);
1375 write_mos_reg(serial, port_number, FCR, 0xcf);
1376 mos7720_port->shadowMCR = 0x0b;
1377 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1378 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x00);
1379
1380 /***********************************************
1381 * Set for higher rates *
1382 ***********************************************/
1383 /* writing baud rate verbatum into uart clock field clearly not right */
1384 if (port_number == 0)
1385 sp_reg = SP1_REG;
1386 else
1387 sp_reg = SP2_REG;
1388 write_mos_reg(serial, dummy, sp_reg, baud * 0x10);
1389 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x03);
1390 mos7720_port->shadowMCR = 0x2b;
1391 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1392
1393 /***********************************************
1394 * Set DLL/DLM
1395 ***********************************************/
1396 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1397 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1398 write_mos_reg(serial, port_number, DLL, 0x01);
1399 write_mos_reg(serial, port_number, DLM, 0x00);
1400 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1401 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1402
1403 return 0;
1404 }
1405
1406 /* baud rate information */
1407 struct divisor_table_entry {
1408 __u32 baudrate;
1409 __u16 divisor;
1410 };
1411
1412 /* Define table of divisors for moschip 7720 hardware *
1413 * These assume a 3.6864MHz crystal, the standard /16, and *
1414 * MCR.7 = 0. */
1415 static struct divisor_table_entry divisor_table[] = {
1416 { 50, 2304},
1417 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */
1418 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */
1419 { 150, 768},
1420 { 300, 384},
1421 { 600, 192},
1422 { 1200, 96},
1423 { 1800, 64},
1424 { 2400, 48},
1425 { 4800, 24},
1426 { 7200, 16},
1427 { 9600, 12},
1428 { 19200, 6},
1429 { 38400, 3},
1430 { 57600, 2},
1431 { 115200, 1},
1432 };
1433
1434 /*****************************************************************************
1435 * calc_baud_rate_divisor
1436 * this function calculates the proper baud rate divisor for the specified
1437 * baud rate.
1438 *****************************************************************************/
1439 static int calc_baud_rate_divisor(struct usb_serial_port *port, int baudrate, int *divisor)
1440 {
1441 int i;
1442 __u16 custom;
1443 __u16 round1;
1444 __u16 round;
1445
1446
1447 dev_dbg(&port->dev, "%s - %d\n", __func__, baudrate);
1448
1449 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) {
1450 if (divisor_table[i].baudrate == baudrate) {
1451 *divisor = divisor_table[i].divisor;
1452 return 0;
1453 }
1454 }
1455
1456 /* After trying for all the standard baud rates *
1457 * Try calculating the divisor for this baud rate */
1458 if (baudrate > 75 && baudrate < 230400) {
1459 /* get the divisor */
1460 custom = (__u16)(230400L / baudrate);
1461
1462 /* Check for round off */
1463 round1 = (__u16)(2304000L / baudrate);
1464 round = (__u16)(round1 - (custom * 10));
1465 if (round > 4)
1466 custom++;
1467 *divisor = custom;
1468
1469 dev_dbg(&port->dev, "Baud %d = %d\n", baudrate, custom);
1470 return 0;
1471 }
1472
1473 dev_dbg(&port->dev, "Baud calculation Failed...\n");
1474 return -EINVAL;
1475 }
1476
1477 /*
1478 * send_cmd_write_baud_rate
1479 * this function sends the proper command to change the baud rate of the
1480 * specified port.
1481 */
1482 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port,
1483 int baudrate)
1484 {
1485 struct usb_serial_port *port;
1486 struct usb_serial *serial;
1487 int divisor;
1488 int status;
1489 unsigned char number;
1490
1491 if (mos7720_port == NULL)
1492 return -1;
1493
1494 port = mos7720_port->port;
1495 serial = port->serial;
1496
1497 number = port->number - port->serial->minor;
1498 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudrate);
1499
1500 /* Calculate the Divisor */
1501 status = calc_baud_rate_divisor(port, baudrate, &divisor);
1502 if (status) {
1503 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1504 return status;
1505 }
1506
1507 /* Enable access to divisor latch */
1508 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1509 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR);
1510
1511 /* Write the divisor */
1512 write_mos_reg(serial, number, DLL, (__u8)(divisor & 0xff));
1513 write_mos_reg(serial, number, DLM, (__u8)((divisor & 0xff00) >> 8));
1514
1515 /* Disable access to divisor latch */
1516 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1517 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR);
1518
1519 return status;
1520 }
1521
1522 /*
1523 * change_port_settings
1524 * This routine is called to set the UART on the device to match
1525 * the specified new settings.
1526 */
1527 static void change_port_settings(struct tty_struct *tty,
1528 struct moschip_port *mos7720_port,
1529 struct ktermios *old_termios)
1530 {
1531 struct usb_serial_port *port;
1532 struct usb_serial *serial;
1533 int baud;
1534 unsigned cflag;
1535 unsigned iflag;
1536 __u8 mask = 0xff;
1537 __u8 lData;
1538 __u8 lParity;
1539 __u8 lStop;
1540 int status;
1541 int port_number;
1542
1543 if (mos7720_port == NULL)
1544 return ;
1545
1546 port = mos7720_port->port;
1547 serial = port->serial;
1548 port_number = port->number - port->serial->minor;
1549
1550 if (!mos7720_port->open) {
1551 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1552 return;
1553 }
1554
1555 lData = UART_LCR_WLEN8;
1556 lStop = 0x00; /* 1 stop bit */
1557 lParity = 0x00; /* No parity */
1558
1559 cflag = tty->termios.c_cflag;
1560 iflag = tty->termios.c_iflag;
1561
1562 /* Change the number of bits */
1563 switch (cflag & CSIZE) {
1564 case CS5:
1565 lData = UART_LCR_WLEN5;
1566 mask = 0x1f;
1567 break;
1568
1569 case CS6:
1570 lData = UART_LCR_WLEN6;
1571 mask = 0x3f;
1572 break;
1573
1574 case CS7:
1575 lData = UART_LCR_WLEN7;
1576 mask = 0x7f;
1577 break;
1578 default:
1579 case CS8:
1580 lData = UART_LCR_WLEN8;
1581 break;
1582 }
1583
1584 /* Change the Parity bit */
1585 if (cflag & PARENB) {
1586 if (cflag & PARODD) {
1587 lParity = UART_LCR_PARITY;
1588 dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1589 } else {
1590 lParity = (UART_LCR_EPAR | UART_LCR_PARITY);
1591 dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1592 }
1593
1594 } else {
1595 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1596 }
1597
1598 if (cflag & CMSPAR)
1599 lParity = lParity | 0x20;
1600
1601 /* Change the Stop bit */
1602 if (cflag & CSTOPB) {
1603 lStop = UART_LCR_STOP;
1604 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1605 } else {
1606 lStop = 0x00;
1607 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1608 }
1609
1610 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
1611 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
1612 #define LCR_PAR_MASK 0x38 /* Mask for parity field */
1613
1614 /* Update the LCR with the correct value */
1615 mos7720_port->shadowLCR &=
1616 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1617 mos7720_port->shadowLCR |= (lData | lParity | lStop);
1618
1619
1620 /* Disable Interrupts */
1621 write_mos_reg(serial, port_number, IER, 0x00);
1622 write_mos_reg(serial, port_number, FCR, 0x00);
1623 write_mos_reg(serial, port_number, FCR, 0xcf);
1624
1625 /* Send the updated LCR value to the mos7720 */
1626 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1627 mos7720_port->shadowMCR = 0x0b;
1628 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1629
1630 /* set up the MCR register and send it to the mos7720 */
1631 mos7720_port->shadowMCR = UART_MCR_OUT2;
1632 if (cflag & CBAUD)
1633 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS);
1634
1635 if (cflag & CRTSCTS) {
1636 mos7720_port->shadowMCR |= (UART_MCR_XONANY);
1637 /* To set hardware flow control to the specified *
1638 * serial port, in SP1/2_CONTROL_REG */
1639 if (port->number)
1640 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x01);
1641 else
1642 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x02);
1643
1644 } else
1645 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY);
1646
1647 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1648
1649 /* Determine divisor based on baud rate */
1650 baud = tty_get_baud_rate(tty);
1651 if (!baud) {
1652 /* pick a default, any default... */
1653 dev_dbg(&port->dev, "Picked default baud...\n");
1654 baud = 9600;
1655 }
1656
1657 if (baud >= 230400) {
1658 set_higher_rates(mos7720_port, baud);
1659 /* Enable Interrupts */
1660 write_mos_reg(serial, port_number, IER, 0x0c);
1661 return;
1662 }
1663
1664 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1665 status = send_cmd_write_baud_rate(mos7720_port, baud);
1666 /* FIXME: needs to write actual resulting baud back not just
1667 blindly do so */
1668 if (cflag & CBAUD)
1669 tty_encode_baud_rate(tty, baud, baud);
1670 /* Enable Interrupts */
1671 write_mos_reg(serial, port_number, IER, 0x0c);
1672
1673 if (port->read_urb->status != -EINPROGRESS) {
1674 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1675 if (status)
1676 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status);
1677 }
1678 }
1679
1680 /*
1681 * mos7720_set_termios
1682 * this function is called by the tty driver when it wants to change the
1683 * termios structure.
1684 */
1685 static void mos7720_set_termios(struct tty_struct *tty,
1686 struct usb_serial_port *port, struct ktermios *old_termios)
1687 {
1688 int status;
1689 unsigned int cflag;
1690 struct usb_serial *serial;
1691 struct moschip_port *mos7720_port;
1692
1693 serial = port->serial;
1694
1695 mos7720_port = usb_get_serial_port_data(port);
1696
1697 if (mos7720_port == NULL)
1698 return;
1699
1700 if (!mos7720_port->open) {
1701 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1702 return;
1703 }
1704
1705 dev_dbg(&port->dev, "setting termios - ASPIRE\n");
1706
1707 cflag = tty->termios.c_cflag;
1708
1709 dev_dbg(&port->dev, "%s - cflag %08x iflag %08x\n", __func__,
1710 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
1711
1712 dev_dbg(&port->dev, "%s - old cflag %08x old iflag %08x\n", __func__,
1713 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
1714
1715 /* change the port settings to the new ones specified */
1716 change_port_settings(tty, mos7720_port, old_termios);
1717
1718 if (port->read_urb->status != -EINPROGRESS) {
1719 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1720 if (status)
1721 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status);
1722 }
1723 }
1724
1725 /*
1726 * get_lsr_info - get line status register info
1727 *
1728 * Purpose: Let user call ioctl() to get info when the UART physically
1729 * is emptied. On bus types like RS485, the transmitter must
1730 * release the bus after transmitting. This must be done when
1731 * the transmit shift register is empty, not be done when the
1732 * transmit holding register is empty. This functionality
1733 * allows an RS485 driver to be written in user space.
1734 */
1735 static int get_lsr_info(struct tty_struct *tty,
1736 struct moschip_port *mos7720_port, unsigned int __user *value)
1737 {
1738 struct usb_serial_port *port = tty->driver_data;
1739 unsigned int result = 0;
1740 unsigned char data = 0;
1741 int port_number = port->number - port->serial->minor;
1742 int count;
1743
1744 count = mos7720_chars_in_buffer(tty);
1745 if (count == 0) {
1746 read_mos_reg(port->serial, port_number, LSR, &data);
1747 if ((data & (UART_LSR_TEMT | UART_LSR_THRE))
1748 == (UART_LSR_TEMT | UART_LSR_THRE)) {
1749 dev_dbg(&port->dev, "%s -- Empty\n", __func__);
1750 result = TIOCSER_TEMT;
1751 }
1752 }
1753 if (copy_to_user(value, &result, sizeof(int)))
1754 return -EFAULT;
1755 return 0;
1756 }
1757
1758 static int mos7720_tiocmget(struct tty_struct *tty)
1759 {
1760 struct usb_serial_port *port = tty->driver_data;
1761 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1762 unsigned int result = 0;
1763 unsigned int mcr ;
1764 unsigned int msr ;
1765
1766 mcr = mos7720_port->shadowMCR;
1767 msr = mos7720_port->shadowMSR;
1768
1769 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */
1770 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */
1771 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */
1772 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */
1773 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */
1774 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
1775
1776 return result;
1777 }
1778
1779 static int mos7720_tiocmset(struct tty_struct *tty,
1780 unsigned int set, unsigned int clear)
1781 {
1782 struct usb_serial_port *port = tty->driver_data;
1783 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1784 unsigned int mcr ;
1785
1786 mcr = mos7720_port->shadowMCR;
1787
1788 if (set & TIOCM_RTS)
1789 mcr |= UART_MCR_RTS;
1790 if (set & TIOCM_DTR)
1791 mcr |= UART_MCR_DTR;
1792 if (set & TIOCM_LOOP)
1793 mcr |= UART_MCR_LOOP;
1794
1795 if (clear & TIOCM_RTS)
1796 mcr &= ~UART_MCR_RTS;
1797 if (clear & TIOCM_DTR)
1798 mcr &= ~UART_MCR_DTR;
1799 if (clear & TIOCM_LOOP)
1800 mcr &= ~UART_MCR_LOOP;
1801
1802 mos7720_port->shadowMCR = mcr;
1803 write_mos_reg(port->serial, port->number - port->serial->minor,
1804 MCR, mos7720_port->shadowMCR);
1805
1806 return 0;
1807 }
1808
1809 static int mos7720_get_icount(struct tty_struct *tty,
1810 struct serial_icounter_struct *icount)
1811 {
1812 struct usb_serial_port *port = tty->driver_data;
1813 struct moschip_port *mos7720_port;
1814 struct async_icount cnow;
1815
1816 mos7720_port = usb_get_serial_port_data(port);
1817 cnow = mos7720_port->icount;
1818
1819 icount->cts = cnow.cts;
1820 icount->dsr = cnow.dsr;
1821 icount->rng = cnow.rng;
1822 icount->dcd = cnow.dcd;
1823 icount->rx = cnow.rx;
1824 icount->tx = cnow.tx;
1825 icount->frame = cnow.frame;
1826 icount->overrun = cnow.overrun;
1827 icount->parity = cnow.parity;
1828 icount->brk = cnow.brk;
1829 icount->buf_overrun = cnow.buf_overrun;
1830
1831 dev_dbg(&port->dev, "%s TIOCGICOUNT RX=%d, TX=%d\n", __func__,
1832 icount->rx, icount->tx);
1833 return 0;
1834 }
1835
1836 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd,
1837 unsigned int __user *value)
1838 {
1839 unsigned int mcr;
1840 unsigned int arg;
1841
1842 struct usb_serial_port *port;
1843
1844 if (mos7720_port == NULL)
1845 return -1;
1846
1847 port = (struct usb_serial_port *)mos7720_port->port;
1848 mcr = mos7720_port->shadowMCR;
1849
1850 if (copy_from_user(&arg, value, sizeof(int)))
1851 return -EFAULT;
1852
1853 switch (cmd) {
1854 case TIOCMBIS:
1855 if (arg & TIOCM_RTS)
1856 mcr |= UART_MCR_RTS;
1857 if (arg & TIOCM_DTR)
1858 mcr |= UART_MCR_RTS;
1859 if (arg & TIOCM_LOOP)
1860 mcr |= UART_MCR_LOOP;
1861 break;
1862
1863 case TIOCMBIC:
1864 if (arg & TIOCM_RTS)
1865 mcr &= ~UART_MCR_RTS;
1866 if (arg & TIOCM_DTR)
1867 mcr &= ~UART_MCR_RTS;
1868 if (arg & TIOCM_LOOP)
1869 mcr &= ~UART_MCR_LOOP;
1870 break;
1871
1872 }
1873
1874 mos7720_port->shadowMCR = mcr;
1875 write_mos_reg(port->serial, port->number - port->serial->minor,
1876 MCR, mos7720_port->shadowMCR);
1877
1878 return 0;
1879 }
1880
1881 static int get_serial_info(struct moschip_port *mos7720_port,
1882 struct serial_struct __user *retinfo)
1883 {
1884 struct serial_struct tmp;
1885
1886 if (!retinfo)
1887 return -EFAULT;
1888
1889 memset(&tmp, 0, sizeof(tmp));
1890
1891 tmp.type = PORT_16550A;
1892 tmp.line = mos7720_port->port->serial->minor;
1893 tmp.port = mos7720_port->port->number;
1894 tmp.irq = 0;
1895 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
1896 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1897 tmp.baud_base = 9600;
1898 tmp.close_delay = 5*HZ;
1899 tmp.closing_wait = 30*HZ;
1900
1901 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1902 return -EFAULT;
1903 return 0;
1904 }
1905
1906 static int mos7720_ioctl(struct tty_struct *tty,
1907 unsigned int cmd, unsigned long arg)
1908 {
1909 struct usb_serial_port *port = tty->driver_data;
1910 struct moschip_port *mos7720_port;
1911 struct async_icount cnow;
1912 struct async_icount cprev;
1913
1914 mos7720_port = usb_get_serial_port_data(port);
1915 if (mos7720_port == NULL)
1916 return -ENODEV;
1917
1918 dev_dbg(&port->dev, "%s - cmd = 0x%x", __func__, cmd);
1919
1920 switch (cmd) {
1921 case TIOCSERGETLSR:
1922 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
1923 return get_lsr_info(tty, mos7720_port,
1924 (unsigned int __user *)arg);
1925
1926 /* FIXME: These should be using the mode methods */
1927 case TIOCMBIS:
1928 case TIOCMBIC:
1929 dev_dbg(&port->dev, "%s TIOCMSET/TIOCMBIC/TIOCMSET\n", __func__);
1930 return set_modem_info(mos7720_port, cmd,
1931 (unsigned int __user *)arg);
1932
1933 case TIOCGSERIAL:
1934 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
1935 return get_serial_info(mos7720_port,
1936 (struct serial_struct __user *)arg);
1937
1938 case TIOCMIWAIT:
1939 dev_dbg(&port->dev, "%s TIOCMIWAIT\n", __func__);
1940 cprev = mos7720_port->icount;
1941 while (1) {
1942 if (signal_pending(current))
1943 return -ERESTARTSYS;
1944 cnow = mos7720_port->icount;
1945 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1946 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1947 return -EIO; /* no change => error */
1948 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1949 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1950 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1951 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
1952 return 0;
1953 }
1954 cprev = cnow;
1955 }
1956 /* NOTREACHED */
1957 break;
1958 }
1959
1960 return -ENOIOCTLCMD;
1961 }
1962
1963 static int mos7720_startup(struct usb_serial *serial)
1964 {
1965 struct usb_device *dev;
1966 char data;
1967 u16 product;
1968 int ret_val;
1969
1970 product = le16_to_cpu(serial->dev->descriptor.idProduct);
1971 dev = serial->dev;
1972
1973 /*
1974 * The 7715 uses the first bulk in/out endpoint pair for the parallel
1975 * port, and the second for the serial port. Because the usbserial core
1976 * assumes both pairs are serial ports, we must engage in a bit of
1977 * subterfuge and swap the pointers for ports 0 and 1 in order to make
1978 * port 0 point to the serial port. However, both moschip devices use a
1979 * single interrupt-in endpoint for both ports (as mentioned a little
1980 * further down), and this endpoint was assigned to port 0. So after
1981 * the swap, we must copy the interrupt endpoint elements from port 1
1982 * (as newly assigned) to port 0, and null out port 1 pointers.
1983 */
1984 if (product == MOSCHIP_DEVICE_ID_7715) {
1985 struct usb_serial_port *tmp = serial->port[0];
1986 serial->port[0] = serial->port[1];
1987 serial->port[1] = tmp;
1988 serial->port[0]->interrupt_in_urb = tmp->interrupt_in_urb;
1989 serial->port[0]->interrupt_in_buffer = tmp->interrupt_in_buffer;
1990 serial->port[0]->interrupt_in_endpointAddress =
1991 tmp->interrupt_in_endpointAddress;
1992 serial->port[1]->interrupt_in_urb = NULL;
1993 serial->port[1]->interrupt_in_buffer = NULL;
1994 }
1995
1996 /* setting configuration feature to one */
1997 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1998 (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5*HZ);
1999
2000 /* start the interrupt urb */
2001 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL);
2002 if (ret_val)
2003 dev_err(&dev->dev,
2004 "%s - Error %d submitting control urb\n",
2005 __func__, ret_val);
2006
2007 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
2008 if (product == MOSCHIP_DEVICE_ID_7715) {
2009 ret_val = mos7715_parport_init(serial);
2010 if (ret_val < 0)
2011 return ret_val;
2012 }
2013 #endif
2014 /* LSR For Port 1 */
2015 read_mos_reg(serial, 0, LSR, &data);
2016 dev_dbg(&dev->dev, "LSR:%x\n", data);
2017
2018 return 0;
2019 }
2020
2021 static void mos7720_release(struct usb_serial *serial)
2022 {
2023 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
2024 /* close the parallel port */
2025
2026 if (le16_to_cpu(serial->dev->descriptor.idProduct)
2027 == MOSCHIP_DEVICE_ID_7715) {
2028 struct urbtracker *urbtrack;
2029 unsigned long flags;
2030 struct mos7715_parport *mos_parport =
2031 usb_get_serial_data(serial);
2032
2033 /* prevent NULL ptr dereference in port callbacks */
2034 spin_lock(&release_lock);
2035 mos_parport->pp->private_data = NULL;
2036 spin_unlock(&release_lock);
2037
2038 /* wait for synchronous usb calls to return */
2039 if (mos_parport->msg_pending)
2040 wait_for_completion_timeout(&mos_parport->syncmsg_compl,
2041 MOS_WDR_TIMEOUT);
2042
2043 parport_remove_port(mos_parport->pp);
2044 usb_set_serial_data(serial, NULL);
2045 mos_parport->serial = NULL;
2046
2047 /* if tasklet currently scheduled, wait for it to complete */
2048 tasklet_kill(&mos_parport->urb_tasklet);
2049
2050 /* unlink any urbs sent by the tasklet */
2051 spin_lock_irqsave(&mos_parport->listlock, flags);
2052 list_for_each_entry(urbtrack,
2053 &mos_parport->active_urbs,
2054 urblist_entry)
2055 usb_unlink_urb(urbtrack->urb);
2056 spin_unlock_irqrestore(&mos_parport->listlock, flags);
2057
2058 kref_put(&mos_parport->ref_count, destroy_mos_parport);
2059 }
2060 #endif
2061 }
2062
2063 static int mos7720_port_probe(struct usb_serial_port *port)
2064 {
2065 struct moschip_port *mos7720_port;
2066
2067 mos7720_port = kzalloc(sizeof(*mos7720_port), GFP_KERNEL);
2068 if (!mos7720_port)
2069 return -ENOMEM;
2070
2071 /* Initialize all port interrupt end point to port 0 int endpoint.
2072 * Our device has only one interrupt endpoint common to all ports.
2073 */
2074 port->interrupt_in_endpointAddress =
2075 port->serial->port[0]->interrupt_in_endpointAddress;
2076 mos7720_port->port = port;
2077
2078 usb_set_serial_port_data(port, mos7720_port);
2079
2080 return 0;
2081 }
2082
2083 static int mos7720_port_remove(struct usb_serial_port *port)
2084 {
2085 struct moschip_port *mos7720_port;
2086
2087 mos7720_port = usb_get_serial_port_data(port);
2088 kfree(mos7720_port);
2089
2090 return 0;
2091 }
2092
2093 static struct usb_serial_driver moschip7720_2port_driver = {
2094 .driver = {
2095 .owner = THIS_MODULE,
2096 .name = "moschip7720",
2097 },
2098 .description = "Moschip 2 port adapter",
2099 .id_table = id_table,
2100 .calc_num_ports = mos77xx_calc_num_ports,
2101 .open = mos7720_open,
2102 .close = mos7720_close,
2103 .throttle = mos7720_throttle,
2104 .unthrottle = mos7720_unthrottle,
2105 .probe = mos77xx_probe,
2106 .attach = mos7720_startup,
2107 .release = mos7720_release,
2108 .port_probe = mos7720_port_probe,
2109 .port_remove = mos7720_port_remove,
2110 .ioctl = mos7720_ioctl,
2111 .tiocmget = mos7720_tiocmget,
2112 .tiocmset = mos7720_tiocmset,
2113 .get_icount = mos7720_get_icount,
2114 .set_termios = mos7720_set_termios,
2115 .write = mos7720_write,
2116 .write_room = mos7720_write_room,
2117 .chars_in_buffer = mos7720_chars_in_buffer,
2118 .break_ctl = mos7720_break,
2119 .read_bulk_callback = mos7720_bulk_in_callback,
2120 .read_int_callback = NULL /* dynamically assigned in probe() */
2121 };
2122
2123 static struct usb_serial_driver * const serial_drivers[] = {
2124 &moschip7720_2port_driver, NULL
2125 };
2126
2127 module_usb_serial_driver(serial_drivers, id_table);
2128
2129 MODULE_AUTHOR(DRIVER_AUTHOR);
2130 MODULE_DESCRIPTION(DRIVER_DESC);
2131 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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