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[mirror_ubuntu-artful-kernel.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 /*
40 * Version Information
41 */
42 #define DRIVER_VERSION "2.1"
43 #define DRIVER_AUTHOR "Aspire Communications pvt Ltd."
44 #define DRIVER_DESC "Moschip USB Serial Driver"
45
46 /* default urb timeout */
47 #define MOS_WDR_TIMEOUT (HZ * 5)
48
49 #define MOS_MAX_PORT 0x02
50 #define MOS_WRITE 0x0E
51 #define MOS_READ 0x0D
52
53 /* Interrupt Rotinue Defines */
54 #define SERIAL_IIR_RLS 0x06
55 #define SERIAL_IIR_RDA 0x04
56 #define SERIAL_IIR_CTI 0x0c
57 #define SERIAL_IIR_THR 0x02
58 #define SERIAL_IIR_MS 0x00
59
60 #define NUM_URBS 16 /* URB Count */
61 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
62
63 /* This structure holds all of the local serial port information */
64 struct moschip_port {
65 __u8 shadowLCR; /* last LCR value received */
66 __u8 shadowMCR; /* last MCR value received */
67 __u8 shadowMSR; /* last MSR value received */
68 char open;
69 struct async_icount icount;
70 struct usb_serial_port *port; /* loop back to the owner */
71 struct urb *write_urb_pool[NUM_URBS];
72 };
73
74 static bool debug;
75
76 static struct usb_serial_driver moschip7720_2port_driver;
77
78 #define USB_VENDOR_ID_MOSCHIP 0x9710
79 #define MOSCHIP_DEVICE_ID_7720 0x7720
80 #define MOSCHIP_DEVICE_ID_7715 0x7715
81
82 static const struct usb_device_id id_table[] = {
83 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7720) },
84 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7715) },
85 { } /* terminating entry */
86 };
87 MODULE_DEVICE_TABLE(usb, id_table);
88
89 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
90
91 /* initial values for parport regs */
92 #define DCR_INIT_VAL 0x0c /* SLCTIN, nINIT */
93 #define ECR_INIT_VAL 0x00 /* SPP mode */
94
95 struct urbtracker {
96 struct mos7715_parport *mos_parport;
97 struct list_head urblist_entry;
98 struct kref ref_count;
99 struct urb *urb;
100 };
101
102 enum mos7715_pp_modes {
103 SPP = 0<<5,
104 PS2 = 1<<5, /* moschip calls this 'NIBBLE' mode */
105 PPF = 2<<5, /* moschip calls this 'CB-FIFO mode */
106 };
107
108 struct mos7715_parport {
109 struct parport *pp; /* back to containing struct */
110 struct kref ref_count; /* to instance of this struct */
111 struct list_head deferred_urbs; /* list deferred async urbs */
112 struct list_head active_urbs; /* list async urbs in flight */
113 spinlock_t listlock; /* protects list access */
114 bool msg_pending; /* usb sync call pending */
115 struct completion syncmsg_compl; /* usb sync call completed */
116 struct tasklet_struct urb_tasklet; /* for sending deferred urbs */
117 struct usb_serial *serial; /* back to containing struct */
118 __u8 shadowECR; /* parallel port regs... */
119 __u8 shadowDCR;
120 atomic_t shadowDSR; /* updated in int-in callback */
121 };
122
123 /* lock guards against dereferencing NULL ptr in parport ops callbacks */
124 static DEFINE_SPINLOCK(release_lock);
125
126 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
127
128 static const unsigned int dummy; /* for clarity in register access fns */
129
130 enum mos_regs {
131 THR, /* serial port regs */
132 RHR,
133 IER,
134 FCR,
135 ISR,
136 LCR,
137 MCR,
138 LSR,
139 MSR,
140 SPR,
141 DLL,
142 DLM,
143 DPR, /* parallel port regs */
144 DSR,
145 DCR,
146 ECR,
147 SP1_REG, /* device control regs */
148 SP2_REG, /* serial port 2 (7720 only) */
149 PP_REG,
150 SP_CONTROL_REG,
151 };
152
153 /*
154 * Return the correct value for the Windex field of the setup packet
155 * for a control endpoint message. See the 7715 datasheet.
156 */
157 static inline __u16 get_reg_index(enum mos_regs reg)
158 {
159 static const __u16 mos7715_index_lookup_table[] = {
160 0x00, /* THR */
161 0x00, /* RHR */
162 0x01, /* IER */
163 0x02, /* FCR */
164 0x02, /* ISR */
165 0x03, /* LCR */
166 0x04, /* MCR */
167 0x05, /* LSR */
168 0x06, /* MSR */
169 0x07, /* SPR */
170 0x00, /* DLL */
171 0x01, /* DLM */
172 0x00, /* DPR */
173 0x01, /* DSR */
174 0x02, /* DCR */
175 0x0a, /* ECR */
176 0x01, /* SP1_REG */
177 0x02, /* SP2_REG (7720 only) */
178 0x04, /* PP_REG (7715 only) */
179 0x08, /* SP_CONTROL_REG */
180 };
181 return mos7715_index_lookup_table[reg];
182 }
183
184 /*
185 * Return the correct value for the upper byte of the Wvalue field of
186 * the setup packet for a control endpoint message.
187 */
188 static inline __u16 get_reg_value(enum mos_regs reg,
189 unsigned int serial_portnum)
190 {
191 if (reg >= SP1_REG) /* control reg */
192 return 0x0000;
193
194 else if (reg >= DPR) /* parallel port reg (7715 only) */
195 return 0x0100;
196
197 else /* serial port reg */
198 return (serial_portnum + 2) << 8;
199 }
200
201 /*
202 * Write data byte to the specified device register. The data is embedded in
203 * the value field of the setup packet. serial_portnum is ignored for registers
204 * not specific to a particular serial port.
205 */
206 static int write_mos_reg(struct usb_serial *serial, unsigned int serial_portnum,
207 enum mos_regs reg, __u8 data)
208 {
209 struct usb_device *usbdev = serial->dev;
210 unsigned int pipe = usb_sndctrlpipe(usbdev, 0);
211 __u8 request = (__u8)0x0e;
212 __u8 requesttype = (__u8)0x40;
213 __u16 index = get_reg_index(reg);
214 __u16 value = get_reg_value(reg, serial_portnum) + data;
215 int status = usb_control_msg(usbdev, pipe, request, requesttype, value,
216 index, NULL, 0, MOS_WDR_TIMEOUT);
217 if (status < 0)
218 dev_err(&usbdev->dev,
219 "mos7720: usb_control_msg() failed: %d", status);
220 return status;
221 }
222
223 /*
224 * Read data byte from the specified device register. The data returned by the
225 * device is embedded in the value field of the setup packet. serial_portnum is
226 * ignored for registers that are not specific to a particular serial port.
227 */
228 static int read_mos_reg(struct usb_serial *serial, unsigned int serial_portnum,
229 enum mos_regs reg, __u8 *data)
230 {
231 struct usb_device *usbdev = serial->dev;
232 unsigned int pipe = usb_rcvctrlpipe(usbdev, 0);
233 __u8 request = (__u8)0x0d;
234 __u8 requesttype = (__u8)0xc0;
235 __u16 index = get_reg_index(reg);
236 __u16 value = get_reg_value(reg, serial_portnum);
237 int status = usb_control_msg(usbdev, pipe, request, requesttype, value,
238 index, data, 1, MOS_WDR_TIMEOUT);
239 if (status < 0)
240 dev_err(&usbdev->dev,
241 "mos7720: usb_control_msg() failed: %d", status);
242 return status;
243 }
244
245 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
246
247 static inline int mos7715_change_mode(struct mos7715_parport *mos_parport,
248 enum mos7715_pp_modes mode)
249 {
250 mos_parport->shadowECR = mode;
251 write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR);
252 return 0;
253 }
254
255 static void destroy_mos_parport(struct kref *kref)
256 {
257 struct mos7715_parport *mos_parport =
258 container_of(kref, struct mos7715_parport, ref_count);
259
260 kfree(mos_parport);
261 }
262
263 static void destroy_urbtracker(struct kref *kref)
264 {
265 struct urbtracker *urbtrack =
266 container_of(kref, struct urbtracker, ref_count);
267 struct mos7715_parport *mos_parport = urbtrack->mos_parport;
268
269 usb_free_urb(urbtrack->urb);
270 kfree(urbtrack);
271 kref_put(&mos_parport->ref_count, destroy_mos_parport);
272 }
273
274 /*
275 * This runs as a tasklet when sending an urb in a non-blocking parallel
276 * port callback had to be deferred because the disconnect mutex could not be
277 * obtained at the time.
278 */
279 static void send_deferred_urbs(unsigned long _mos_parport)
280 {
281 int ret_val;
282 unsigned long flags;
283 struct mos7715_parport *mos_parport = (void *)_mos_parport;
284 struct urbtracker *urbtrack;
285 struct list_head *cursor, *next;
286
287 /* if release function ran, game over */
288 if (unlikely(mos_parport->serial == NULL))
289 return;
290
291 /* try again to get the mutex */
292 if (!mutex_trylock(&mos_parport->serial->disc_mutex)) {
293 dbg("%s: rescheduling tasklet", __func__);
294 tasklet_schedule(&mos_parport->urb_tasklet);
295 return;
296 }
297
298 /* if device disconnected, game over */
299 if (unlikely(mos_parport->serial->disconnected)) {
300 mutex_unlock(&mos_parport->serial->disc_mutex);
301 return;
302 }
303
304 spin_lock_irqsave(&mos_parport->listlock, flags);
305 if (list_empty(&mos_parport->deferred_urbs)) {
306 spin_unlock_irqrestore(&mos_parport->listlock, flags);
307 mutex_unlock(&mos_parport->serial->disc_mutex);
308 dbg("%s: deferred_urbs list empty", __func__);
309 return;
310 }
311
312 /* move contents of deferred_urbs list to active_urbs list and submit */
313 list_for_each_safe(cursor, next, &mos_parport->deferred_urbs)
314 list_move_tail(cursor, &mos_parport->active_urbs);
315 list_for_each_entry(urbtrack, &mos_parport->active_urbs,
316 urblist_entry) {
317 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
318 dbg("%s: urb submitted", __func__);
319 if (ret_val) {
320 dev_err(&mos_parport->serial->dev->dev,
321 "usb_submit_urb() failed: %d", ret_val);
322 list_del(&urbtrack->urblist_entry);
323 kref_put(&urbtrack->ref_count, destroy_urbtracker);
324 }
325 }
326 spin_unlock_irqrestore(&mos_parport->listlock, flags);
327 mutex_unlock(&mos_parport->serial->disc_mutex);
328 }
329
330 /* callback for parallel port control urbs submitted asynchronously */
331 static void async_complete(struct urb *urb)
332 {
333 struct urbtracker *urbtrack = urb->context;
334 int status = urb->status;
335
336 if (unlikely(status))
337 dbg("%s - nonzero urb status received: %d", __func__, status);
338
339 /* remove the urbtracker from the active_urbs list */
340 spin_lock(&urbtrack->mos_parport->listlock);
341 list_del(&urbtrack->urblist_entry);
342 spin_unlock(&urbtrack->mos_parport->listlock);
343 kref_put(&urbtrack->ref_count, destroy_urbtracker);
344 }
345
346 static int write_parport_reg_nonblock(struct mos7715_parport *mos_parport,
347 enum mos_regs reg, __u8 data)
348 {
349 struct urbtracker *urbtrack;
350 int ret_val;
351 unsigned long flags;
352 struct usb_ctrlrequest setup;
353 struct usb_serial *serial = mos_parport->serial;
354 struct usb_device *usbdev = serial->dev;
355
356 /* create and initialize the control urb and containing urbtracker */
357 urbtrack = kmalloc(sizeof(struct urbtracker), GFP_ATOMIC);
358 if (urbtrack == NULL) {
359 dev_err(&usbdev->dev, "out of memory");
360 return -ENOMEM;
361 }
362 kref_get(&mos_parport->ref_count);
363 urbtrack->mos_parport = mos_parport;
364 urbtrack->urb = usb_alloc_urb(0, GFP_ATOMIC);
365 if (urbtrack->urb == NULL) {
366 dev_err(&usbdev->dev, "out of urbs");
367 kfree(urbtrack);
368 return -ENOMEM;
369 }
370 setup.bRequestType = (__u8)0x40;
371 setup.bRequest = (__u8)0x0e;
372 setup.wValue = get_reg_value(reg, dummy);
373 setup.wIndex = get_reg_index(reg);
374 setup.wLength = 0;
375 usb_fill_control_urb(urbtrack->urb, usbdev,
376 usb_sndctrlpipe(usbdev, 0),
377 (unsigned char *)&setup,
378 NULL, 0, async_complete, urbtrack);
379 kref_init(&urbtrack->ref_count);
380 INIT_LIST_HEAD(&urbtrack->urblist_entry);
381
382 /*
383 * get the disconnect mutex, or add tracker to the deferred_urbs list
384 * and schedule a tasklet to try again later
385 */
386 if (!mutex_trylock(&serial->disc_mutex)) {
387 spin_lock_irqsave(&mos_parport->listlock, flags);
388 list_add_tail(&urbtrack->urblist_entry,
389 &mos_parport->deferred_urbs);
390 spin_unlock_irqrestore(&mos_parport->listlock, flags);
391 tasklet_schedule(&mos_parport->urb_tasklet);
392 dbg("tasklet scheduled");
393 return 0;
394 }
395
396 /* bail if device disconnected */
397 if (serial->disconnected) {
398 kref_put(&urbtrack->ref_count, destroy_urbtracker);
399 mutex_unlock(&serial->disc_mutex);
400 return -ENODEV;
401 }
402
403 /* add the tracker to the active_urbs list and submit */
404 spin_lock_irqsave(&mos_parport->listlock, flags);
405 list_add_tail(&urbtrack->urblist_entry, &mos_parport->active_urbs);
406 spin_unlock_irqrestore(&mos_parport->listlock, flags);
407 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
408 mutex_unlock(&serial->disc_mutex);
409 if (ret_val) {
410 dev_err(&usbdev->dev,
411 "%s: submit_urb() failed: %d", __func__, ret_val);
412 spin_lock_irqsave(&mos_parport->listlock, flags);
413 list_del(&urbtrack->urblist_entry);
414 spin_unlock_irqrestore(&mos_parport->listlock, flags);
415 kref_put(&urbtrack->ref_count, destroy_urbtracker);
416 return ret_val;
417 }
418 return 0;
419 }
420
421 /*
422 * This is the the common top part of all parallel port callback operations that
423 * send synchronous messages to the device. This implements convoluted locking
424 * that avoids two scenarios: (1) a port operation is called after usbserial
425 * has called our release function, at which point struct mos7715_parport has
426 * been destroyed, and (2) the device has been disconnected, but usbserial has
427 * not called the release function yet because someone has a serial port open.
428 * The shared release_lock prevents the first, and the mutex and disconnected
429 * flag maintained by usbserial covers the second. We also use the msg_pending
430 * flag to ensure that all synchronous usb messgage calls have completed before
431 * our release function can return.
432 */
433 static int parport_prologue(struct parport *pp)
434 {
435 struct mos7715_parport *mos_parport;
436
437 spin_lock(&release_lock);
438 mos_parport = pp->private_data;
439 if (unlikely(mos_parport == NULL)) {
440 /* release fn called, port struct destroyed */
441 spin_unlock(&release_lock);
442 return -1;
443 }
444 mos_parport->msg_pending = true; /* synch usb call pending */
445 INIT_COMPLETION(mos_parport->syncmsg_compl);
446 spin_unlock(&release_lock);
447
448 mutex_lock(&mos_parport->serial->disc_mutex);
449 if (mos_parport->serial->disconnected) {
450 /* device disconnected */
451 mutex_unlock(&mos_parport->serial->disc_mutex);
452 mos_parport->msg_pending = false;
453 complete(&mos_parport->syncmsg_compl);
454 return -1;
455 }
456
457 return 0;
458 }
459
460 /*
461 * This is the the common bottom part of all parallel port functions that send
462 * synchronous messages to the device.
463 */
464 static inline void parport_epilogue(struct parport *pp)
465 {
466 struct mos7715_parport *mos_parport = pp->private_data;
467 mutex_unlock(&mos_parport->serial->disc_mutex);
468 mos_parport->msg_pending = false;
469 complete(&mos_parport->syncmsg_compl);
470 }
471
472 static void parport_mos7715_write_data(struct parport *pp, unsigned char d)
473 {
474 struct mos7715_parport *mos_parport = pp->private_data;
475
476 if (parport_prologue(pp) < 0)
477 return;
478 mos7715_change_mode(mos_parport, SPP);
479 write_mos_reg(mos_parport->serial, dummy, DPR, (__u8)d);
480 parport_epilogue(pp);
481 }
482
483 static unsigned char parport_mos7715_read_data(struct parport *pp)
484 {
485 struct mos7715_parport *mos_parport = pp->private_data;
486 unsigned char d;
487
488 if (parport_prologue(pp) < 0)
489 return 0;
490 read_mos_reg(mos_parport->serial, dummy, DPR, &d);
491 parport_epilogue(pp);
492 return d;
493 }
494
495 static void parport_mos7715_write_control(struct parport *pp, unsigned char d)
496 {
497 struct mos7715_parport *mos_parport = pp->private_data;
498 __u8 data;
499
500 if (parport_prologue(pp) < 0)
501 return;
502 data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0);
503 write_mos_reg(mos_parport->serial, dummy, DCR, data);
504 mos_parport->shadowDCR = data;
505 parport_epilogue(pp);
506 }
507
508 static unsigned char parport_mos7715_read_control(struct parport *pp)
509 {
510 struct mos7715_parport *mos_parport = pp->private_data;
511 __u8 dcr;
512
513 spin_lock(&release_lock);
514 mos_parport = pp->private_data;
515 if (unlikely(mos_parport == NULL)) {
516 spin_unlock(&release_lock);
517 return 0;
518 }
519 dcr = mos_parport->shadowDCR & 0x0f;
520 spin_unlock(&release_lock);
521 return dcr;
522 }
523
524 static unsigned char parport_mos7715_frob_control(struct parport *pp,
525 unsigned char mask,
526 unsigned char val)
527 {
528 struct mos7715_parport *mos_parport = pp->private_data;
529 __u8 dcr;
530
531 mask &= 0x0f;
532 val &= 0x0f;
533 if (parport_prologue(pp) < 0)
534 return 0;
535 mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val;
536 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
537 dcr = mos_parport->shadowDCR & 0x0f;
538 parport_epilogue(pp);
539 return dcr;
540 }
541
542 static unsigned char parport_mos7715_read_status(struct parport *pp)
543 {
544 unsigned char status;
545 struct mos7715_parport *mos_parport = pp->private_data;
546
547 spin_lock(&release_lock);
548 mos_parport = pp->private_data;
549 if (unlikely(mos_parport == NULL)) { /* release called */
550 spin_unlock(&release_lock);
551 return 0;
552 }
553 status = atomic_read(&mos_parport->shadowDSR) & 0xf8;
554 spin_unlock(&release_lock);
555 return status;
556 }
557
558 static void parport_mos7715_enable_irq(struct parport *pp)
559 {
560 }
561
562 static void parport_mos7715_disable_irq(struct parport *pp)
563 {
564 }
565
566 static void parport_mos7715_data_forward(struct parport *pp)
567 {
568 struct mos7715_parport *mos_parport = pp->private_data;
569
570 if (parport_prologue(pp) < 0)
571 return;
572 mos7715_change_mode(mos_parport, PS2);
573 mos_parport->shadowDCR &= ~0x20;
574 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
575 parport_epilogue(pp);
576 }
577
578 static void parport_mos7715_data_reverse(struct parport *pp)
579 {
580 struct mos7715_parport *mos_parport = pp->private_data;
581
582 if (parport_prologue(pp) < 0)
583 return;
584 mos7715_change_mode(mos_parport, PS2);
585 mos_parport->shadowDCR |= 0x20;
586 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
587 parport_epilogue(pp);
588 }
589
590 static void parport_mos7715_init_state(struct pardevice *dev,
591 struct parport_state *s)
592 {
593 s->u.pc.ctr = DCR_INIT_VAL;
594 s->u.pc.ecr = ECR_INIT_VAL;
595 }
596
597 /* N.B. Parport core code requires that this function not block */
598 static void parport_mos7715_save_state(struct parport *pp,
599 struct parport_state *s)
600 {
601 struct mos7715_parport *mos_parport;
602
603 spin_lock(&release_lock);
604 mos_parport = pp->private_data;
605 if (unlikely(mos_parport == NULL)) { /* release called */
606 spin_unlock(&release_lock);
607 return;
608 }
609 s->u.pc.ctr = mos_parport->shadowDCR;
610 s->u.pc.ecr = mos_parport->shadowECR;
611 spin_unlock(&release_lock);
612 }
613
614 /* N.B. Parport core code requires that this function not block */
615 static void parport_mos7715_restore_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 write_parport_reg_nonblock(mos_parport, DCR, mos_parport->shadowDCR);
627 write_parport_reg_nonblock(mos_parport, ECR, mos_parport->shadowECR);
628 spin_unlock(&release_lock);
629 }
630
631 static size_t parport_mos7715_write_compat(struct parport *pp,
632 const void *buffer,
633 size_t len, int flags)
634 {
635 int retval;
636 struct mos7715_parport *mos_parport = pp->private_data;
637 int actual_len;
638
639 if (parport_prologue(pp) < 0)
640 return 0;
641 mos7715_change_mode(mos_parport, PPF);
642 retval = usb_bulk_msg(mos_parport->serial->dev,
643 usb_sndbulkpipe(mos_parport->serial->dev, 2),
644 (void *)buffer, len, &actual_len,
645 MOS_WDR_TIMEOUT);
646 parport_epilogue(pp);
647 if (retval) {
648 dev_err(&mos_parport->serial->dev->dev,
649 "mos7720: usb_bulk_msg() failed: %d", retval);
650 return 0;
651 }
652 return actual_len;
653 }
654
655 static struct parport_operations parport_mos7715_ops = {
656 .owner = THIS_MODULE,
657 .write_data = parport_mos7715_write_data,
658 .read_data = parport_mos7715_read_data,
659
660 .write_control = parport_mos7715_write_control,
661 .read_control = parport_mos7715_read_control,
662 .frob_control = parport_mos7715_frob_control,
663
664 .read_status = parport_mos7715_read_status,
665
666 .enable_irq = parport_mos7715_enable_irq,
667 .disable_irq = parport_mos7715_disable_irq,
668
669 .data_forward = parport_mos7715_data_forward,
670 .data_reverse = parport_mos7715_data_reverse,
671
672 .init_state = parport_mos7715_init_state,
673 .save_state = parport_mos7715_save_state,
674 .restore_state = parport_mos7715_restore_state,
675
676 .compat_write_data = parport_mos7715_write_compat,
677
678 .nibble_read_data = parport_ieee1284_read_nibble,
679 .byte_read_data = parport_ieee1284_read_byte,
680 };
681
682 /*
683 * Allocate and initialize parallel port control struct, initialize
684 * the parallel port hardware device, and register with the parport subsystem.
685 */
686 static int mos7715_parport_init(struct usb_serial *serial)
687 {
688 struct mos7715_parport *mos_parport;
689
690 /* allocate and initialize parallel port control struct */
691 mos_parport = kzalloc(sizeof(struct mos7715_parport), GFP_KERNEL);
692 if (mos_parport == NULL) {
693 dbg("mos7715_parport_init: kzalloc failed");
694 return -ENOMEM;
695 }
696 mos_parport->msg_pending = false;
697 kref_init(&mos_parport->ref_count);
698 spin_lock_init(&mos_parport->listlock);
699 INIT_LIST_HEAD(&mos_parport->active_urbs);
700 INIT_LIST_HEAD(&mos_parport->deferred_urbs);
701 usb_set_serial_data(serial, mos_parport); /* hijack private pointer */
702 mos_parport->serial = serial;
703 tasklet_init(&mos_parport->urb_tasklet, send_deferred_urbs,
704 (unsigned long) mos_parport);
705 init_completion(&mos_parport->syncmsg_compl);
706
707 /* cycle parallel port reset bit */
708 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x80);
709 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x00);
710
711 /* initialize device registers */
712 mos_parport->shadowDCR = DCR_INIT_VAL;
713 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
714 mos_parport->shadowECR = ECR_INIT_VAL;
715 write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR);
716
717 /* register with parport core */
718 mos_parport->pp = parport_register_port(0, PARPORT_IRQ_NONE,
719 PARPORT_DMA_NONE,
720 &parport_mos7715_ops);
721 if (mos_parport->pp == NULL) {
722 dev_err(&serial->interface->dev,
723 "Could not register parport\n");
724 kref_put(&mos_parport->ref_count, destroy_mos_parport);
725 return -EIO;
726 }
727 mos_parport->pp->private_data = mos_parport;
728 mos_parport->pp->modes = PARPORT_MODE_COMPAT | PARPORT_MODE_PCSPP;
729 mos_parport->pp->dev = &serial->interface->dev;
730 parport_announce_port(mos_parport->pp);
731
732 return 0;
733 }
734 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
735
736 /*
737 * mos7720_interrupt_callback
738 * this is the callback function for when we have received data on the
739 * interrupt endpoint.
740 */
741 static void mos7720_interrupt_callback(struct urb *urb)
742 {
743 int result;
744 int length;
745 int status = urb->status;
746 __u8 *data;
747 __u8 sp1;
748 __u8 sp2;
749
750 switch (status) {
751 case 0:
752 /* success */
753 break;
754 case -ECONNRESET:
755 case -ENOENT:
756 case -ESHUTDOWN:
757 /* this urb is terminated, clean up */
758 dbg("%s - urb shutting down with status: %d", __func__,
759 status);
760 return;
761 default:
762 dbg("%s - nonzero urb status received: %d", __func__,
763 status);
764 goto exit;
765 }
766
767 length = urb->actual_length;
768 data = urb->transfer_buffer;
769
770 /* Moschip get 4 bytes
771 * Byte 1 IIR Port 1 (port.number is 0)
772 * Byte 2 IIR Port 2 (port.number is 1)
773 * Byte 3 --------------
774 * Byte 4 FIFO status for both */
775
776 /* the above description is inverted
777 * oneukum 2007-03-14 */
778
779 if (unlikely(length != 4)) {
780 dbg("Wrong data !!!");
781 return;
782 }
783
784 sp1 = data[3];
785 sp2 = data[2];
786
787 if ((sp1 | sp2) & 0x01) {
788 /* No Interrupt Pending in both the ports */
789 dbg("No Interrupt !!!");
790 } else {
791 switch (sp1 & 0x0f) {
792 case SERIAL_IIR_RLS:
793 dbg("Serial Port 1: Receiver status error or address "
794 "bit detected in 9-bit mode\n");
795 break;
796 case SERIAL_IIR_CTI:
797 dbg("Serial Port 1: Receiver time out");
798 break;
799 case SERIAL_IIR_MS:
800 /* dbg("Serial Port 1: Modem status change"); */
801 break;
802 }
803
804 switch (sp2 & 0x0f) {
805 case SERIAL_IIR_RLS:
806 dbg("Serial Port 2: Receiver status error or address "
807 "bit detected in 9-bit mode");
808 break;
809 case SERIAL_IIR_CTI:
810 dbg("Serial Port 2: Receiver time out");
811 break;
812 case SERIAL_IIR_MS:
813 /* dbg("Serial Port 2: Modem status change"); */
814 break;
815 }
816 }
817
818 exit:
819 result = usb_submit_urb(urb, GFP_ATOMIC);
820 if (result)
821 dev_err(&urb->dev->dev,
822 "%s - Error %d submitting control urb\n",
823 __func__, result);
824 }
825
826 /*
827 * mos7715_interrupt_callback
828 * this is the 7715's callback function for when we have received data on
829 * the interrupt endpoint.
830 */
831 static void mos7715_interrupt_callback(struct urb *urb)
832 {
833 int result;
834 int length;
835 int status = urb->status;
836 __u8 *data;
837 __u8 iir;
838
839 switch (status) {
840 case 0:
841 /* success */
842 break;
843 case -ECONNRESET:
844 case -ENOENT:
845 case -ESHUTDOWN:
846 case -ENODEV:
847 /* this urb is terminated, clean up */
848 dbg("%s - urb shutting down with status: %d", __func__,
849 status);
850 return;
851 default:
852 dbg("%s - nonzero urb status received: %d", __func__,
853 status);
854 goto exit;
855 }
856
857 length = urb->actual_length;
858 data = urb->transfer_buffer;
859
860 /* Structure of data from 7715 device:
861 * Byte 1: IIR serial Port
862 * Byte 2: unused
863 * Byte 2: DSR parallel port
864 * Byte 4: FIFO status for both */
865
866 if (unlikely(length != 4)) {
867 dbg("Wrong data !!!");
868 return;
869 }
870
871 iir = data[0];
872 if (!(iir & 0x01)) { /* serial port interrupt pending */
873 switch (iir & 0x0f) {
874 case SERIAL_IIR_RLS:
875 dbg("Serial Port: Receiver status error or address "
876 "bit detected in 9-bit mode\n");
877 break;
878 case SERIAL_IIR_CTI:
879 dbg("Serial Port: Receiver time out");
880 break;
881 case SERIAL_IIR_MS:
882 /* dbg("Serial Port: Modem status change"); */
883 break;
884 }
885 }
886
887 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
888 { /* update local copy of DSR reg */
889 struct usb_serial_port *port = urb->context;
890 struct mos7715_parport *mos_parport = port->serial->private;
891 if (unlikely(mos_parport == NULL))
892 return;
893 atomic_set(&mos_parport->shadowDSR, data[2]);
894 }
895 #endif
896
897 exit:
898 result = usb_submit_urb(urb, GFP_ATOMIC);
899 if (result)
900 dev_err(&urb->dev->dev,
901 "%s - Error %d submitting control urb\n",
902 __func__, result);
903 }
904
905 /*
906 * mos7720_bulk_in_callback
907 * this is the callback function for when we have received data on the
908 * bulk in endpoint.
909 */
910 static void mos7720_bulk_in_callback(struct urb *urb)
911 {
912 int retval;
913 unsigned char *data ;
914 struct usb_serial_port *port;
915 struct tty_struct *tty;
916 int status = urb->status;
917
918 if (status) {
919 dbg("nonzero read bulk status received: %d", status);
920 return;
921 }
922
923 port = urb->context;
924
925 dbg("Entering...%s", __func__);
926
927 data = urb->transfer_buffer;
928
929 tty = tty_port_tty_get(&port->port);
930 if (tty && urb->actual_length) {
931 tty_insert_flip_string(tty, data, urb->actual_length);
932 tty_flip_buffer_push(tty);
933 }
934 tty_kref_put(tty);
935
936 if (port->read_urb->status != -EINPROGRESS) {
937 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
938 if (retval)
939 dbg("usb_submit_urb(read bulk) failed, retval = %d",
940 retval);
941 }
942 }
943
944 /*
945 * mos7720_bulk_out_data_callback
946 * this is the callback function for when we have finished sending serial
947 * data on the bulk out endpoint.
948 */
949 static void mos7720_bulk_out_data_callback(struct urb *urb)
950 {
951 struct moschip_port *mos7720_port;
952 struct tty_struct *tty;
953 int status = urb->status;
954
955 if (status) {
956 dbg("nonzero write bulk status received:%d", status);
957 return;
958 }
959
960 mos7720_port = urb->context;
961 if (!mos7720_port) {
962 dbg("NULL mos7720_port pointer");
963 return ;
964 }
965
966 tty = tty_port_tty_get(&mos7720_port->port->port);
967
968 if (tty && mos7720_port->open)
969 tty_wakeup(tty);
970 tty_kref_put(tty);
971 }
972
973 /*
974 * mos77xx_probe
975 * this function installs the appropriate read interrupt endpoint callback
976 * depending on whether the device is a 7720 or 7715, thus avoiding costly
977 * run-time checks in the high-frequency callback routine itself.
978 */
979 static int mos77xx_probe(struct usb_serial *serial,
980 const struct usb_device_id *id)
981 {
982 if (id->idProduct == MOSCHIP_DEVICE_ID_7715)
983 moschip7720_2port_driver.read_int_callback =
984 mos7715_interrupt_callback;
985 else
986 moschip7720_2port_driver.read_int_callback =
987 mos7720_interrupt_callback;
988
989 return 0;
990 }
991
992 static int mos77xx_calc_num_ports(struct usb_serial *serial)
993 {
994 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
995 if (product == MOSCHIP_DEVICE_ID_7715)
996 return 1;
997
998 return 2;
999 }
1000
1001 static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port)
1002 {
1003 struct usb_serial *serial;
1004 struct urb *urb;
1005 struct moschip_port *mos7720_port;
1006 int response;
1007 int port_number;
1008 __u8 data;
1009 int allocated_urbs = 0;
1010 int j;
1011
1012 serial = port->serial;
1013
1014 mos7720_port = usb_get_serial_port_data(port);
1015 if (mos7720_port == NULL)
1016 return -ENODEV;
1017
1018 usb_clear_halt(serial->dev, port->write_urb->pipe);
1019 usb_clear_halt(serial->dev, port->read_urb->pipe);
1020
1021 /* Initialising the write urb pool */
1022 for (j = 0; j < NUM_URBS; ++j) {
1023 urb = usb_alloc_urb(0, GFP_KERNEL);
1024 mos7720_port->write_urb_pool[j] = urb;
1025
1026 if (urb == NULL) {
1027 dev_err(&port->dev, "No more urbs???\n");
1028 continue;
1029 }
1030
1031 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1032 GFP_KERNEL);
1033 if (!urb->transfer_buffer) {
1034 dev_err(&port->dev,
1035 "%s-out of memory for urb buffers.\n",
1036 __func__);
1037 usb_free_urb(mos7720_port->write_urb_pool[j]);
1038 mos7720_port->write_urb_pool[j] = NULL;
1039 continue;
1040 }
1041 allocated_urbs++;
1042 }
1043
1044 if (!allocated_urbs)
1045 return -ENOMEM;
1046
1047 /* Initialize MCS7720 -- Write Init values to corresponding Registers
1048 *
1049 * Register Index
1050 * 0 : THR/RHR
1051 * 1 : IER
1052 * 2 : FCR
1053 * 3 : LCR
1054 * 4 : MCR
1055 * 5 : LSR
1056 * 6 : MSR
1057 * 7 : SPR
1058 *
1059 * 0x08 : SP1/2 Control Reg
1060 */
1061 port_number = port->number - port->serial->minor;
1062 read_mos_reg(serial, port_number, LSR, &data);
1063
1064 dbg("SS::%p LSR:%x", mos7720_port, data);
1065
1066 dbg("Check:Sending Command ..........");
1067
1068 write_mos_reg(serial, dummy, SP1_REG, 0x02);
1069 write_mos_reg(serial, dummy, SP2_REG, 0x02);
1070
1071 write_mos_reg(serial, port_number, IER, 0x00);
1072 write_mos_reg(serial, port_number, FCR, 0x00);
1073
1074 write_mos_reg(serial, port_number, FCR, 0xcf);
1075 mos7720_port->shadowLCR = 0x03;
1076 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1077 mos7720_port->shadowMCR = 0x0b;
1078 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1079
1080 write_mos_reg(serial, port_number, SP_CONTROL_REG, 0x00);
1081 read_mos_reg(serial, dummy, SP_CONTROL_REG, &data);
1082 data = data | (port->number - port->serial->minor + 1);
1083 write_mos_reg(serial, dummy, SP_CONTROL_REG, data);
1084 mos7720_port->shadowLCR = 0x83;
1085 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1086 write_mos_reg(serial, port_number, THR, 0x0c);
1087 write_mos_reg(serial, port_number, IER, 0x00);
1088 mos7720_port->shadowLCR = 0x03;
1089 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1090 write_mos_reg(serial, port_number, IER, 0x0c);
1091
1092 response = usb_submit_urb(port->read_urb, GFP_KERNEL);
1093 if (response)
1094 dev_err(&port->dev, "%s - Error %d submitting read urb\n",
1095 __func__, response);
1096
1097 /* initialize our icount structure */
1098 memset(&(mos7720_port->icount), 0x00, sizeof(mos7720_port->icount));
1099
1100 /* initialize our port settings */
1101 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */
1102
1103 /* send a open port command */
1104 mos7720_port->open = 1;
1105
1106 return 0;
1107 }
1108
1109 /*
1110 * mos7720_chars_in_buffer
1111 * this function is called by the tty driver when it wants to know how many
1112 * bytes of data we currently have outstanding in the port (data that has
1113 * been written, but hasn't made it out the port yet)
1114 * If successful, we return the number of bytes left to be written in the
1115 * system,
1116 * Otherwise we return a negative error number.
1117 */
1118 static int mos7720_chars_in_buffer(struct tty_struct *tty)
1119 {
1120 struct usb_serial_port *port = tty->driver_data;
1121 int i;
1122 int chars = 0;
1123 struct moschip_port *mos7720_port;
1124
1125 dbg("%s:entering ...........", __func__);
1126
1127 mos7720_port = usb_get_serial_port_data(port);
1128 if (mos7720_port == NULL) {
1129 dbg("%s:leaving ...........", __func__);
1130 return 0;
1131 }
1132
1133 for (i = 0; i < NUM_URBS; ++i) {
1134 if (mos7720_port->write_urb_pool[i] &&
1135 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS)
1136 chars += URB_TRANSFER_BUFFER_SIZE;
1137 }
1138 dbg("%s - returns %d", __func__, chars);
1139 return chars;
1140 }
1141
1142 static void mos7720_close(struct usb_serial_port *port)
1143 {
1144 struct usb_serial *serial;
1145 struct moschip_port *mos7720_port;
1146 int j;
1147
1148 dbg("mos7720_close:entering...");
1149
1150 serial = port->serial;
1151
1152 mos7720_port = usb_get_serial_port_data(port);
1153 if (mos7720_port == NULL)
1154 return;
1155
1156 for (j = 0; j < NUM_URBS; ++j)
1157 usb_kill_urb(mos7720_port->write_urb_pool[j]);
1158
1159 /* Freeing Write URBs */
1160 for (j = 0; j < NUM_URBS; ++j) {
1161 if (mos7720_port->write_urb_pool[j]) {
1162 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer);
1163 usb_free_urb(mos7720_port->write_urb_pool[j]);
1164 }
1165 }
1166
1167 /* While closing port, shutdown all bulk read, write *
1168 * and interrupt read if they exists, otherwise nop */
1169 dbg("Shutdown bulk write");
1170 usb_kill_urb(port->write_urb);
1171 dbg("Shutdown bulk read");
1172 usb_kill_urb(port->read_urb);
1173
1174 mutex_lock(&serial->disc_mutex);
1175 /* these commands must not be issued if the device has
1176 * been disconnected */
1177 if (!serial->disconnected) {
1178 write_mos_reg(serial, port->number - port->serial->minor,
1179 MCR, 0x00);
1180 write_mos_reg(serial, port->number - port->serial->minor,
1181 IER, 0x00);
1182 }
1183 mutex_unlock(&serial->disc_mutex);
1184 mos7720_port->open = 0;
1185
1186 dbg("Leaving %s", __func__);
1187 }
1188
1189 static void mos7720_break(struct tty_struct *tty, int break_state)
1190 {
1191 struct usb_serial_port *port = tty->driver_data;
1192 unsigned char data;
1193 struct usb_serial *serial;
1194 struct moschip_port *mos7720_port;
1195
1196 dbg("Entering %s", __func__);
1197
1198 serial = port->serial;
1199
1200 mos7720_port = usb_get_serial_port_data(port);
1201 if (mos7720_port == NULL)
1202 return;
1203
1204 if (break_state == -1)
1205 data = mos7720_port->shadowLCR | UART_LCR_SBC;
1206 else
1207 data = mos7720_port->shadowLCR & ~UART_LCR_SBC;
1208
1209 mos7720_port->shadowLCR = data;
1210 write_mos_reg(serial, port->number - port->serial->minor,
1211 LCR, mos7720_port->shadowLCR);
1212 }
1213
1214 /*
1215 * mos7720_write_room
1216 * this function is called by the tty driver when it wants to know how many
1217 * bytes of data we can accept for a specific port.
1218 * If successful, we return the amount of room that we have for this port
1219 * Otherwise we return a negative error number.
1220 */
1221 static int mos7720_write_room(struct tty_struct *tty)
1222 {
1223 struct usb_serial_port *port = tty->driver_data;
1224 struct moschip_port *mos7720_port;
1225 int room = 0;
1226 int i;
1227
1228 dbg("%s:entering ...........", __func__);
1229
1230 mos7720_port = usb_get_serial_port_data(port);
1231 if (mos7720_port == NULL) {
1232 dbg("%s:leaving ...........", __func__);
1233 return -ENODEV;
1234 }
1235
1236 /* FIXME: Locking */
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 room += URB_TRANSFER_BUFFER_SIZE;
1241 }
1242
1243 dbg("%s - returns %d", __func__, room);
1244 return room;
1245 }
1246
1247 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port,
1248 const unsigned char *data, int count)
1249 {
1250 int status;
1251 int i;
1252 int bytes_sent = 0;
1253 int transfer_size;
1254
1255 struct moschip_port *mos7720_port;
1256 struct usb_serial *serial;
1257 struct urb *urb;
1258 const unsigned char *current_position = data;
1259
1260 dbg("%s:entering ...........", __func__);
1261
1262 serial = port->serial;
1263
1264 mos7720_port = usb_get_serial_port_data(port);
1265 if (mos7720_port == NULL) {
1266 dbg("mos7720_port is NULL");
1267 return -ENODEV;
1268 }
1269
1270 /* try to find a free urb in the list */
1271 urb = NULL;
1272
1273 for (i = 0; i < NUM_URBS; ++i) {
1274 if (mos7720_port->write_urb_pool[i] &&
1275 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) {
1276 urb = mos7720_port->write_urb_pool[i];
1277 dbg("URB:%d", i);
1278 break;
1279 }
1280 }
1281
1282 if (urb == NULL) {
1283 dbg("%s - no more free urbs", __func__);
1284 goto exit;
1285 }
1286
1287 if (urb->transfer_buffer == NULL) {
1288 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1289 GFP_KERNEL);
1290 if (urb->transfer_buffer == NULL) {
1291 dev_err_console(port, "%s no more kernel memory...\n",
1292 __func__);
1293 goto exit;
1294 }
1295 }
1296 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1297
1298 memcpy(urb->transfer_buffer, current_position, transfer_size);
1299 usb_serial_debug_data(debug, &port->dev, __func__, transfer_size,
1300 urb->transfer_buffer);
1301
1302 /* fill urb with data and submit */
1303 usb_fill_bulk_urb(urb, serial->dev,
1304 usb_sndbulkpipe(serial->dev,
1305 port->bulk_out_endpointAddress),
1306 urb->transfer_buffer, transfer_size,
1307 mos7720_bulk_out_data_callback, mos7720_port);
1308
1309 /* send it down the pipe */
1310 status = usb_submit_urb(urb, GFP_ATOMIC);
1311 if (status) {
1312 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1313 "with status = %d\n", __func__, status);
1314 bytes_sent = status;
1315 goto exit;
1316 }
1317 bytes_sent = transfer_size;
1318
1319 exit:
1320 return bytes_sent;
1321 }
1322
1323 static void mos7720_throttle(struct tty_struct *tty)
1324 {
1325 struct usb_serial_port *port = tty->driver_data;
1326 struct moschip_port *mos7720_port;
1327 int status;
1328
1329 dbg("%s- port %d", __func__, port->number);
1330
1331 mos7720_port = usb_get_serial_port_data(port);
1332
1333 if (mos7720_port == NULL)
1334 return;
1335
1336 if (!mos7720_port->open) {
1337 dbg("port not opened");
1338 return;
1339 }
1340
1341 dbg("%s: Entering ..........", __func__);
1342
1343 /* if we are implementing XON/XOFF, send the stop character */
1344 if (I_IXOFF(tty)) {
1345 unsigned char stop_char = STOP_CHAR(tty);
1346 status = mos7720_write(tty, port, &stop_char, 1);
1347 if (status <= 0)
1348 return;
1349 }
1350
1351 /* if we are implementing RTS/CTS, toggle that line */
1352 if (tty->termios->c_cflag & CRTSCTS) {
1353 mos7720_port->shadowMCR &= ~UART_MCR_RTS;
1354 write_mos_reg(port->serial, port->number - port->serial->minor,
1355 MCR, mos7720_port->shadowMCR);
1356 if (status != 0)
1357 return;
1358 }
1359 }
1360
1361 static void mos7720_unthrottle(struct tty_struct *tty)
1362 {
1363 struct usb_serial_port *port = tty->driver_data;
1364 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1365 int status;
1366
1367 if (mos7720_port == NULL)
1368 return;
1369
1370 if (!mos7720_port->open) {
1371 dbg("%s - port not opened", __func__);
1372 return;
1373 }
1374
1375 dbg("%s: Entering ..........", __func__);
1376
1377 /* if we are implementing XON/XOFF, send the start character */
1378 if (I_IXOFF(tty)) {
1379 unsigned char start_char = START_CHAR(tty);
1380 status = mos7720_write(tty, port, &start_char, 1);
1381 if (status <= 0)
1382 return;
1383 }
1384
1385 /* if we are implementing RTS/CTS, toggle that line */
1386 if (tty->termios->c_cflag & CRTSCTS) {
1387 mos7720_port->shadowMCR |= UART_MCR_RTS;
1388 write_mos_reg(port->serial, port->number - port->serial->minor,
1389 MCR, mos7720_port->shadowMCR);
1390 if (status != 0)
1391 return;
1392 }
1393 }
1394
1395 /* FIXME: this function does not work */
1396 static int set_higher_rates(struct moschip_port *mos7720_port,
1397 unsigned int baud)
1398 {
1399 struct usb_serial_port *port;
1400 struct usb_serial *serial;
1401 int port_number;
1402 enum mos_regs sp_reg;
1403 if (mos7720_port == NULL)
1404 return -EINVAL;
1405
1406 port = mos7720_port->port;
1407 serial = port->serial;
1408
1409 /***********************************************
1410 * Init Sequence for higher rates
1411 ***********************************************/
1412 dbg("Sending Setting Commands ..........");
1413 port_number = port->number - port->serial->minor;
1414
1415 write_mos_reg(serial, port_number, IER, 0x00);
1416 write_mos_reg(serial, port_number, FCR, 0x00);
1417 write_mos_reg(serial, port_number, FCR, 0xcf);
1418 mos7720_port->shadowMCR = 0x0b;
1419 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1420 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x00);
1421
1422 /***********************************************
1423 * Set for higher rates *
1424 ***********************************************/
1425 /* writing baud rate verbatum into uart clock field clearly not right */
1426 if (port_number == 0)
1427 sp_reg = SP1_REG;
1428 else
1429 sp_reg = SP2_REG;
1430 write_mos_reg(serial, dummy, sp_reg, baud * 0x10);
1431 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x03);
1432 mos7720_port->shadowMCR = 0x2b;
1433 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1434
1435 /***********************************************
1436 * Set DLL/DLM
1437 ***********************************************/
1438 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1439 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1440 write_mos_reg(serial, port_number, DLL, 0x01);
1441 write_mos_reg(serial, port_number, DLM, 0x00);
1442 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1443 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1444
1445 return 0;
1446 }
1447
1448 /* baud rate information */
1449 struct divisor_table_entry {
1450 __u32 baudrate;
1451 __u16 divisor;
1452 };
1453
1454 /* Define table of divisors for moschip 7720 hardware *
1455 * These assume a 3.6864MHz crystal, the standard /16, and *
1456 * MCR.7 = 0. */
1457 static struct divisor_table_entry divisor_table[] = {
1458 { 50, 2304},
1459 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */
1460 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */
1461 { 150, 768},
1462 { 300, 384},
1463 { 600, 192},
1464 { 1200, 96},
1465 { 1800, 64},
1466 { 2400, 48},
1467 { 4800, 24},
1468 { 7200, 16},
1469 { 9600, 12},
1470 { 19200, 6},
1471 { 38400, 3},
1472 { 57600, 2},
1473 { 115200, 1},
1474 };
1475
1476 /*****************************************************************************
1477 * calc_baud_rate_divisor
1478 * this function calculates the proper baud rate divisor for the specified
1479 * baud rate.
1480 *****************************************************************************/
1481 static int calc_baud_rate_divisor(int baudrate, int *divisor)
1482 {
1483 int i;
1484 __u16 custom;
1485 __u16 round1;
1486 __u16 round;
1487
1488
1489 dbg("%s - %d", __func__, baudrate);
1490
1491 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) {
1492 if (divisor_table[i].baudrate == baudrate) {
1493 *divisor = divisor_table[i].divisor;
1494 return 0;
1495 }
1496 }
1497
1498 /* After trying for all the standard baud rates *
1499 * Try calculating the divisor for this baud rate */
1500 if (baudrate > 75 && baudrate < 230400) {
1501 /* get the divisor */
1502 custom = (__u16)(230400L / baudrate);
1503
1504 /* Check for round off */
1505 round1 = (__u16)(2304000L / baudrate);
1506 round = (__u16)(round1 - (custom * 10));
1507 if (round > 4)
1508 custom++;
1509 *divisor = custom;
1510
1511 dbg("Baud %d = %d", baudrate, custom);
1512 return 0;
1513 }
1514
1515 dbg("Baud calculation Failed...");
1516 return -EINVAL;
1517 }
1518
1519 /*
1520 * send_cmd_write_baud_rate
1521 * this function sends the proper command to change the baud rate of the
1522 * specified port.
1523 */
1524 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port,
1525 int baudrate)
1526 {
1527 struct usb_serial_port *port;
1528 struct usb_serial *serial;
1529 int divisor;
1530 int status;
1531 unsigned char number;
1532
1533 if (mos7720_port == NULL)
1534 return -1;
1535
1536 port = mos7720_port->port;
1537 serial = port->serial;
1538
1539 dbg("%s: Entering ..........", __func__);
1540
1541 number = port->number - port->serial->minor;
1542 dbg("%s - port = %d, baud = %d", __func__, port->number, baudrate);
1543
1544 /* Calculate the Divisor */
1545 status = calc_baud_rate_divisor(baudrate, &divisor);
1546 if (status) {
1547 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1548 return status;
1549 }
1550
1551 /* Enable access to divisor latch */
1552 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1553 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR);
1554
1555 /* Write the divisor */
1556 write_mos_reg(serial, number, DLL, (__u8)(divisor & 0xff));
1557 write_mos_reg(serial, number, DLM, (__u8)((divisor & 0xff00) >> 8));
1558
1559 /* Disable access to divisor latch */
1560 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1561 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR);
1562
1563 return status;
1564 }
1565
1566 /*
1567 * change_port_settings
1568 * This routine is called to set the UART on the device to match
1569 * the specified new settings.
1570 */
1571 static void change_port_settings(struct tty_struct *tty,
1572 struct moschip_port *mos7720_port,
1573 struct ktermios *old_termios)
1574 {
1575 struct usb_serial_port *port;
1576 struct usb_serial *serial;
1577 int baud;
1578 unsigned cflag;
1579 unsigned iflag;
1580 __u8 mask = 0xff;
1581 __u8 lData;
1582 __u8 lParity;
1583 __u8 lStop;
1584 int status;
1585 int port_number;
1586
1587 if (mos7720_port == NULL)
1588 return ;
1589
1590 port = mos7720_port->port;
1591 serial = port->serial;
1592 port_number = port->number - port->serial->minor;
1593
1594 dbg("%s - port %d", __func__, port->number);
1595
1596 if (!mos7720_port->open) {
1597 dbg("%s - port not opened", __func__);
1598 return;
1599 }
1600
1601 dbg("%s: Entering ..........", __func__);
1602
1603 lData = UART_LCR_WLEN8;
1604 lStop = 0x00; /* 1 stop bit */
1605 lParity = 0x00; /* No parity */
1606
1607 cflag = tty->termios->c_cflag;
1608 iflag = tty->termios->c_iflag;
1609
1610 /* Change the number of bits */
1611 switch (cflag & CSIZE) {
1612 case CS5:
1613 lData = UART_LCR_WLEN5;
1614 mask = 0x1f;
1615 break;
1616
1617 case CS6:
1618 lData = UART_LCR_WLEN6;
1619 mask = 0x3f;
1620 break;
1621
1622 case CS7:
1623 lData = UART_LCR_WLEN7;
1624 mask = 0x7f;
1625 break;
1626 default:
1627 case CS8:
1628 lData = UART_LCR_WLEN8;
1629 break;
1630 }
1631
1632 /* Change the Parity bit */
1633 if (cflag & PARENB) {
1634 if (cflag & PARODD) {
1635 lParity = UART_LCR_PARITY;
1636 dbg("%s - parity = odd", __func__);
1637 } else {
1638 lParity = (UART_LCR_EPAR | UART_LCR_PARITY);
1639 dbg("%s - parity = even", __func__);
1640 }
1641
1642 } else {
1643 dbg("%s - parity = none", __func__);
1644 }
1645
1646 if (cflag & CMSPAR)
1647 lParity = lParity | 0x20;
1648
1649 /* Change the Stop bit */
1650 if (cflag & CSTOPB) {
1651 lStop = UART_LCR_STOP;
1652 dbg("%s - stop bits = 2", __func__);
1653 } else {
1654 lStop = 0x00;
1655 dbg("%s - stop bits = 1", __func__);
1656 }
1657
1658 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
1659 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
1660 #define LCR_PAR_MASK 0x38 /* Mask for parity field */
1661
1662 /* Update the LCR with the correct value */
1663 mos7720_port->shadowLCR &=
1664 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1665 mos7720_port->shadowLCR |= (lData | lParity | lStop);
1666
1667
1668 /* Disable Interrupts */
1669 write_mos_reg(serial, port_number, IER, 0x00);
1670 write_mos_reg(serial, port_number, FCR, 0x00);
1671 write_mos_reg(serial, port_number, FCR, 0xcf);
1672
1673 /* Send the updated LCR value to the mos7720 */
1674 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1675 mos7720_port->shadowMCR = 0x0b;
1676 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1677
1678 /* set up the MCR register and send it to the mos7720 */
1679 mos7720_port->shadowMCR = UART_MCR_OUT2;
1680 if (cflag & CBAUD)
1681 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS);
1682
1683 if (cflag & CRTSCTS) {
1684 mos7720_port->shadowMCR |= (UART_MCR_XONANY);
1685 /* To set hardware flow control to the specified *
1686 * serial port, in SP1/2_CONTROL_REG */
1687 if (port->number)
1688 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x01);
1689 else
1690 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x02);
1691
1692 } else
1693 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY);
1694
1695 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1696
1697 /* Determine divisor based on baud rate */
1698 baud = tty_get_baud_rate(tty);
1699 if (!baud) {
1700 /* pick a default, any default... */
1701 dbg("Picked default baud...");
1702 baud = 9600;
1703 }
1704
1705 if (baud >= 230400) {
1706 set_higher_rates(mos7720_port, baud);
1707 /* Enable Interrupts */
1708 write_mos_reg(serial, port_number, IER, 0x0c);
1709 return;
1710 }
1711
1712 dbg("%s - baud rate = %d", __func__, baud);
1713 status = send_cmd_write_baud_rate(mos7720_port, baud);
1714 /* FIXME: needs to write actual resulting baud back not just
1715 blindly do so */
1716 if (cflag & CBAUD)
1717 tty_encode_baud_rate(tty, baud, baud);
1718 /* Enable Interrupts */
1719 write_mos_reg(serial, port_number, IER, 0x0c);
1720
1721 if (port->read_urb->status != -EINPROGRESS) {
1722 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1723 if (status)
1724 dbg("usb_submit_urb(read bulk) failed, status = %d",
1725 status);
1726 }
1727 }
1728
1729 /*
1730 * mos7720_set_termios
1731 * this function is called by the tty driver when it wants to change the
1732 * termios structure.
1733 */
1734 static void mos7720_set_termios(struct tty_struct *tty,
1735 struct usb_serial_port *port, struct ktermios *old_termios)
1736 {
1737 int status;
1738 unsigned int cflag;
1739 struct usb_serial *serial;
1740 struct moschip_port *mos7720_port;
1741
1742 serial = port->serial;
1743
1744 mos7720_port = usb_get_serial_port_data(port);
1745
1746 if (mos7720_port == NULL)
1747 return;
1748
1749 if (!mos7720_port->open) {
1750 dbg("%s - port not opened", __func__);
1751 return;
1752 }
1753
1754 dbg("%s\n", "setting termios - ASPIRE");
1755
1756 cflag = tty->termios->c_cflag;
1757
1758 dbg("%s - cflag %08x iflag %08x", __func__,
1759 tty->termios->c_cflag,
1760 RELEVANT_IFLAG(tty->termios->c_iflag));
1761
1762 dbg("%s - old cflag %08x old iflag %08x", __func__,
1763 old_termios->c_cflag,
1764 RELEVANT_IFLAG(old_termios->c_iflag));
1765
1766 dbg("%s - port %d", __func__, port->number);
1767
1768 /* change the port settings to the new ones specified */
1769 change_port_settings(tty, mos7720_port, old_termios);
1770
1771 if (port->read_urb->status != -EINPROGRESS) {
1772 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1773 if (status)
1774 dbg("usb_submit_urb(read bulk) failed, status = %d",
1775 status);
1776 }
1777 }
1778
1779 /*
1780 * get_lsr_info - get line status register info
1781 *
1782 * Purpose: Let user call ioctl() to get info when the UART physically
1783 * is emptied. On bus types like RS485, the transmitter must
1784 * release the bus after transmitting. This must be done when
1785 * the transmit shift register is empty, not be done when the
1786 * transmit holding register is empty. This functionality
1787 * allows an RS485 driver to be written in user space.
1788 */
1789 static int get_lsr_info(struct tty_struct *tty,
1790 struct moschip_port *mos7720_port, unsigned int __user *value)
1791 {
1792 struct usb_serial_port *port = tty->driver_data;
1793 unsigned int result = 0;
1794 unsigned char data = 0;
1795 int port_number = port->number - port->serial->minor;
1796 int count;
1797
1798 count = mos7720_chars_in_buffer(tty);
1799 if (count == 0) {
1800 read_mos_reg(port->serial, port_number, LSR, &data);
1801 if ((data & (UART_LSR_TEMT | UART_LSR_THRE))
1802 == (UART_LSR_TEMT | UART_LSR_THRE)) {
1803 dbg("%s -- Empty", __func__);
1804 result = TIOCSER_TEMT;
1805 }
1806 }
1807 if (copy_to_user(value, &result, sizeof(int)))
1808 return -EFAULT;
1809 return 0;
1810 }
1811
1812 static int mos7720_tiocmget(struct tty_struct *tty)
1813 {
1814 struct usb_serial_port *port = tty->driver_data;
1815 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1816 unsigned int result = 0;
1817 unsigned int mcr ;
1818 unsigned int msr ;
1819
1820 dbg("%s - port %d", __func__, port->number);
1821
1822 mcr = mos7720_port->shadowMCR;
1823 msr = mos7720_port->shadowMSR;
1824
1825 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */
1826 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */
1827 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */
1828 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */
1829 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */
1830 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
1831
1832 dbg("%s -- %x", __func__, result);
1833
1834 return result;
1835 }
1836
1837 static int mos7720_tiocmset(struct tty_struct *tty,
1838 unsigned int set, unsigned int clear)
1839 {
1840 struct usb_serial_port *port = tty->driver_data;
1841 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1842 unsigned int mcr ;
1843 dbg("%s - port %d", __func__, port->number);
1844 dbg("he was at tiocmset");
1845
1846 mcr = mos7720_port->shadowMCR;
1847
1848 if (set & TIOCM_RTS)
1849 mcr |= UART_MCR_RTS;
1850 if (set & TIOCM_DTR)
1851 mcr |= UART_MCR_DTR;
1852 if (set & TIOCM_LOOP)
1853 mcr |= UART_MCR_LOOP;
1854
1855 if (clear & TIOCM_RTS)
1856 mcr &= ~UART_MCR_RTS;
1857 if (clear & TIOCM_DTR)
1858 mcr &= ~UART_MCR_DTR;
1859 if (clear & TIOCM_LOOP)
1860 mcr &= ~UART_MCR_LOOP;
1861
1862 mos7720_port->shadowMCR = mcr;
1863 write_mos_reg(port->serial, port->number - port->serial->minor,
1864 MCR, mos7720_port->shadowMCR);
1865
1866 return 0;
1867 }
1868
1869 static int mos7720_get_icount(struct tty_struct *tty,
1870 struct serial_icounter_struct *icount)
1871 {
1872 struct usb_serial_port *port = tty->driver_data;
1873 struct moschip_port *mos7720_port;
1874 struct async_icount cnow;
1875
1876 mos7720_port = usb_get_serial_port_data(port);
1877 cnow = mos7720_port->icount;
1878
1879 icount->cts = cnow.cts;
1880 icount->dsr = cnow.dsr;
1881 icount->rng = cnow.rng;
1882 icount->dcd = cnow.dcd;
1883 icount->rx = cnow.rx;
1884 icount->tx = cnow.tx;
1885 icount->frame = cnow.frame;
1886 icount->overrun = cnow.overrun;
1887 icount->parity = cnow.parity;
1888 icount->brk = cnow.brk;
1889 icount->buf_overrun = cnow.buf_overrun;
1890
1891 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
1892 port->number, icount->rx, icount->tx);
1893 return 0;
1894 }
1895
1896 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd,
1897 unsigned int __user *value)
1898 {
1899 unsigned int mcr;
1900 unsigned int arg;
1901
1902 struct usb_serial_port *port;
1903
1904 if (mos7720_port == NULL)
1905 return -1;
1906
1907 port = (struct usb_serial_port *)mos7720_port->port;
1908 mcr = mos7720_port->shadowMCR;
1909
1910 if (copy_from_user(&arg, value, sizeof(int)))
1911 return -EFAULT;
1912
1913 switch (cmd) {
1914 case TIOCMBIS:
1915 if (arg & TIOCM_RTS)
1916 mcr |= UART_MCR_RTS;
1917 if (arg & TIOCM_DTR)
1918 mcr |= UART_MCR_RTS;
1919 if (arg & TIOCM_LOOP)
1920 mcr |= UART_MCR_LOOP;
1921 break;
1922
1923 case TIOCMBIC:
1924 if (arg & TIOCM_RTS)
1925 mcr &= ~UART_MCR_RTS;
1926 if (arg & TIOCM_DTR)
1927 mcr &= ~UART_MCR_RTS;
1928 if (arg & TIOCM_LOOP)
1929 mcr &= ~UART_MCR_LOOP;
1930 break;
1931
1932 }
1933
1934 mos7720_port->shadowMCR = mcr;
1935 write_mos_reg(port->serial, port->number - port->serial->minor,
1936 MCR, mos7720_port->shadowMCR);
1937
1938 return 0;
1939 }
1940
1941 static int get_serial_info(struct moschip_port *mos7720_port,
1942 struct serial_struct __user *retinfo)
1943 {
1944 struct serial_struct tmp;
1945
1946 if (!retinfo)
1947 return -EFAULT;
1948
1949 memset(&tmp, 0, sizeof(tmp));
1950
1951 tmp.type = PORT_16550A;
1952 tmp.line = mos7720_port->port->serial->minor;
1953 tmp.port = mos7720_port->port->number;
1954 tmp.irq = 0;
1955 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
1956 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1957 tmp.baud_base = 9600;
1958 tmp.close_delay = 5*HZ;
1959 tmp.closing_wait = 30*HZ;
1960
1961 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1962 return -EFAULT;
1963 return 0;
1964 }
1965
1966 static int mos7720_ioctl(struct tty_struct *tty,
1967 unsigned int cmd, unsigned long arg)
1968 {
1969 struct usb_serial_port *port = tty->driver_data;
1970 struct moschip_port *mos7720_port;
1971 struct async_icount cnow;
1972 struct async_icount cprev;
1973
1974 mos7720_port = usb_get_serial_port_data(port);
1975 if (mos7720_port == NULL)
1976 return -ENODEV;
1977
1978 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
1979
1980 switch (cmd) {
1981 case TIOCSERGETLSR:
1982 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
1983 return get_lsr_info(tty, mos7720_port,
1984 (unsigned int __user *)arg);
1985
1986 /* FIXME: These should be using the mode methods */
1987 case TIOCMBIS:
1988 case TIOCMBIC:
1989 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET",
1990 __func__, port->number);
1991 return set_modem_info(mos7720_port, cmd,
1992 (unsigned int __user *)arg);
1993
1994 case TIOCGSERIAL:
1995 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
1996 return get_serial_info(mos7720_port,
1997 (struct serial_struct __user *)arg);
1998
1999 case TIOCMIWAIT:
2000 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2001 cprev = mos7720_port->icount;
2002 while (1) {
2003 if (signal_pending(current))
2004 return -ERESTARTSYS;
2005 cnow = mos7720_port->icount;
2006 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2007 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2008 return -EIO; /* no change => error */
2009 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2010 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2011 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2012 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2013 return 0;
2014 }
2015 cprev = cnow;
2016 }
2017 /* NOTREACHED */
2018 break;
2019 }
2020
2021 return -ENOIOCTLCMD;
2022 }
2023
2024 static int mos7720_startup(struct usb_serial *serial)
2025 {
2026 struct moschip_port *mos7720_port;
2027 struct usb_device *dev;
2028 int i;
2029 char data;
2030 u16 product;
2031 int ret_val;
2032
2033 dbg("%s: Entering ..........", __func__);
2034
2035 if (!serial) {
2036 dbg("Invalid Handler");
2037 return -ENODEV;
2038 }
2039
2040 product = le16_to_cpu(serial->dev->descriptor.idProduct);
2041 dev = serial->dev;
2042
2043 /*
2044 * The 7715 uses the first bulk in/out endpoint pair for the parallel
2045 * port, and the second for the serial port. Because the usbserial core
2046 * assumes both pairs are serial ports, we must engage in a bit of
2047 * subterfuge and swap the pointers for ports 0 and 1 in order to make
2048 * port 0 point to the serial port. However, both moschip devices use a
2049 * single interrupt-in endpoint for both ports (as mentioned a little
2050 * further down), and this endpoint was assigned to port 0. So after
2051 * the swap, we must copy the interrupt endpoint elements from port 1
2052 * (as newly assigned) to port 0, and null out port 1 pointers.
2053 */
2054 if (product == MOSCHIP_DEVICE_ID_7715) {
2055 struct usb_serial_port *tmp = serial->port[0];
2056 serial->port[0] = serial->port[1];
2057 serial->port[1] = tmp;
2058 serial->port[0]->interrupt_in_urb = tmp->interrupt_in_urb;
2059 serial->port[0]->interrupt_in_buffer = tmp->interrupt_in_buffer;
2060 serial->port[0]->interrupt_in_endpointAddress =
2061 tmp->interrupt_in_endpointAddress;
2062 serial->port[1]->interrupt_in_urb = NULL;
2063 serial->port[1]->interrupt_in_buffer = NULL;
2064 }
2065
2066
2067 /* set up serial port private structures */
2068 for (i = 0; i < serial->num_ports; ++i) {
2069 mos7720_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2070 if (mos7720_port == NULL) {
2071 dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2072 return -ENOMEM;
2073 }
2074
2075 /* Initialize all port interrupt end point to port 0 int
2076 * endpoint. Our device has only one interrupt endpoint
2077 * common to all ports */
2078 serial->port[i]->interrupt_in_endpointAddress =
2079 serial->port[0]->interrupt_in_endpointAddress;
2080
2081 mos7720_port->port = serial->port[i];
2082 usb_set_serial_port_data(serial->port[i], mos7720_port);
2083
2084 dbg("port number is %d", serial->port[i]->number);
2085 dbg("serial number is %d", serial->minor);
2086 }
2087
2088
2089 /* setting configuration feature to one */
2090 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2091 (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5*HZ);
2092
2093 /* start the interrupt urb */
2094 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL);
2095 if (ret_val)
2096 dev_err(&dev->dev,
2097 "%s - Error %d submitting control urb\n",
2098 __func__, ret_val);
2099
2100 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
2101 if (product == MOSCHIP_DEVICE_ID_7715) {
2102 ret_val = mos7715_parport_init(serial);
2103 if (ret_val < 0)
2104 return ret_val;
2105 }
2106 #endif
2107 /* LSR For Port 1 */
2108 read_mos_reg(serial, 0, LSR, &data);
2109 dbg("LSR:%x", data);
2110
2111 return 0;
2112 }
2113
2114 static void mos7720_release(struct usb_serial *serial)
2115 {
2116 int i;
2117
2118 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
2119 /* close the parallel port */
2120
2121 if (le16_to_cpu(serial->dev->descriptor.idProduct)
2122 == MOSCHIP_DEVICE_ID_7715) {
2123 struct urbtracker *urbtrack;
2124 unsigned long flags;
2125 struct mos7715_parport *mos_parport =
2126 usb_get_serial_data(serial);
2127
2128 /* prevent NULL ptr dereference in port callbacks */
2129 spin_lock(&release_lock);
2130 mos_parport->pp->private_data = NULL;
2131 spin_unlock(&release_lock);
2132
2133 /* wait for synchronous usb calls to return */
2134 if (mos_parport->msg_pending)
2135 wait_for_completion_timeout(&mos_parport->syncmsg_compl,
2136 MOS_WDR_TIMEOUT);
2137
2138 parport_remove_port(mos_parport->pp);
2139 usb_set_serial_data(serial, NULL);
2140 mos_parport->serial = NULL;
2141
2142 /* if tasklet currently scheduled, wait for it to complete */
2143 tasklet_kill(&mos_parport->urb_tasklet);
2144
2145 /* unlink any urbs sent by the tasklet */
2146 spin_lock_irqsave(&mos_parport->listlock, flags);
2147 list_for_each_entry(urbtrack,
2148 &mos_parport->active_urbs,
2149 urblist_entry)
2150 usb_unlink_urb(urbtrack->urb);
2151 spin_unlock_irqrestore(&mos_parport->listlock, flags);
2152
2153 kref_put(&mos_parport->ref_count, destroy_mos_parport);
2154 }
2155 #endif
2156 /* free private structure allocated for serial port */
2157 for (i = 0; i < serial->num_ports; ++i)
2158 kfree(usb_get_serial_port_data(serial->port[i]));
2159 }
2160
2161 static struct usb_serial_driver moschip7720_2port_driver = {
2162 .driver = {
2163 .owner = THIS_MODULE,
2164 .name = "moschip7720",
2165 },
2166 .description = "Moschip 2 port adapter",
2167 .id_table = id_table,
2168 .calc_num_ports = mos77xx_calc_num_ports,
2169 .open = mos7720_open,
2170 .close = mos7720_close,
2171 .throttle = mos7720_throttle,
2172 .unthrottle = mos7720_unthrottle,
2173 .probe = mos77xx_probe,
2174 .attach = mos7720_startup,
2175 .release = mos7720_release,
2176 .ioctl = mos7720_ioctl,
2177 .tiocmget = mos7720_tiocmget,
2178 .tiocmset = mos7720_tiocmset,
2179 .get_icount = mos7720_get_icount,
2180 .set_termios = mos7720_set_termios,
2181 .write = mos7720_write,
2182 .write_room = mos7720_write_room,
2183 .chars_in_buffer = mos7720_chars_in_buffer,
2184 .break_ctl = mos7720_break,
2185 .read_bulk_callback = mos7720_bulk_in_callback,
2186 .read_int_callback = NULL /* dynamically assigned in probe() */
2187 };
2188
2189 static struct usb_serial_driver * const serial_drivers[] = {
2190 &moschip7720_2port_driver, NULL
2191 };
2192
2193 module_usb_serial_driver(serial_drivers, id_table);
2194
2195 MODULE_AUTHOR(DRIVER_AUTHOR);
2196 MODULE_DESCRIPTION(DRIVER_DESC);
2197 MODULE_LICENSE("GPL");
2198
2199 module_param(debug, bool, S_IRUGO | S_IWUSR);
2200 MODULE_PARM_DESC(debug, "Debug enabled or not");
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