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include: replace linux/module.h with "struct module" wherever possible
[linux-2.6/next.git] / drivers / usb / serial / mos7720.c
blob40abedbc5943a26359a60087fdb54cc948cd2e7f
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 int 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 moschip_port_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, moschip_port_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 dbg("%s called", __func__);
261 kfree(mos_parport);
262 }
263
264 static void destroy_urbtracker(struct kref *kref)
265 {
266 struct urbtracker *urbtrack =
267 container_of(kref, struct urbtracker, ref_count);
268 struct mos7715_parport *mos_parport = urbtrack->mos_parport;
269 dbg("%s called", __func__);
270 usb_free_urb(urbtrack->urb);
271 kfree(urbtrack);
272 kref_put(&mos_parport->ref_count, destroy_mos_parport);
273 }
274
275 /*
276 * This runs as a tasklet when sending an urb in a non-blocking parallel
277 * port callback had to be deferred because the disconnect mutex could not be
278 * obtained at the time.
279 */
280 static void send_deferred_urbs(unsigned long _mos_parport)
281 {
282 int ret_val;
283 unsigned long flags;
284 struct mos7715_parport *mos_parport = (void *)_mos_parport;
285 struct urbtracker *urbtrack;
286 struct list_head *cursor, *next;
287
288 dbg("%s called", __func__);
289
290 /* if release function ran, game over */
291 if (unlikely(mos_parport->serial == NULL))
292 return;
293
294 /* try again to get the mutex */
295 if (!mutex_trylock(&mos_parport->serial->disc_mutex)) {
296 dbg("%s: rescheduling tasklet", __func__);
297 tasklet_schedule(&mos_parport->urb_tasklet);
298 return;
299 }
300
301 /* if device disconnected, game over */
302 if (unlikely(mos_parport->serial->disconnected)) {
303 mutex_unlock(&mos_parport->serial->disc_mutex);
304 return;
305 }
306
307 spin_lock_irqsave(&mos_parport->listlock, flags);
308 if (list_empty(&mos_parport->deferred_urbs)) {
309 spin_unlock_irqrestore(&mos_parport->listlock, flags);
310 mutex_unlock(&mos_parport->serial->disc_mutex);
311 dbg("%s: deferred_urbs list empty", __func__);
312 return;
313 }
314
315 /* move contents of deferred_urbs list to active_urbs list and submit */
316 list_for_each_safe(cursor, next, &mos_parport->deferred_urbs)
317 list_move_tail(cursor, &mos_parport->active_urbs);
318 list_for_each_entry(urbtrack, &mos_parport->active_urbs,
319 urblist_entry) {
320 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
321 dbg("%s: urb submitted", __func__);
322 if (ret_val) {
323 dev_err(&mos_parport->serial->dev->dev,
324 "usb_submit_urb() failed: %d", ret_val);
325 list_del(&urbtrack->urblist_entry);
326 kref_put(&urbtrack->ref_count, destroy_urbtracker);
327 }
328 }
329 spin_unlock_irqrestore(&mos_parport->listlock, flags);
330 mutex_unlock(&mos_parport->serial->disc_mutex);
331 }
332
333 /* callback for parallel port control urbs submitted asynchronously */
334 static void async_complete(struct urb *urb)
335 {
336 struct urbtracker *urbtrack = urb->context;
337 int status = urb->status;
338 dbg("%s called", __func__);
339 if (unlikely(status))
340 dbg("%s - nonzero urb status received: %d", __func__, status);
341
342 /* remove the urbtracker from the active_urbs list */
343 spin_lock(&urbtrack->mos_parport->listlock);
344 list_del(&urbtrack->urblist_entry);
345 spin_unlock(&urbtrack->mos_parport->listlock);
346 kref_put(&urbtrack->ref_count, destroy_urbtracker);
347 }
348
349 static int write_parport_reg_nonblock(struct mos7715_parport *mos_parport,
350 enum mos_regs reg, __u8 data)
351 {
352 struct urbtracker *urbtrack;
353 int ret_val;
354 unsigned long flags;
355 struct usb_ctrlrequest setup;
356 struct usb_serial *serial = mos_parport->serial;
357 struct usb_device *usbdev = serial->dev;
358 dbg("%s called", __func__);
359
360 /* create and initialize the control urb and containing urbtracker */
361 urbtrack = kmalloc(sizeof(struct urbtracker), GFP_ATOMIC);
362 if (urbtrack == NULL) {
363 dev_err(&usbdev->dev, "out of memory");
364 return -ENOMEM;
365 }
366 kref_get(&mos_parport->ref_count);
367 urbtrack->mos_parport = mos_parport;
368 urbtrack->urb = usb_alloc_urb(0, GFP_ATOMIC);
369 if (urbtrack->urb == NULL) {
370 dev_err(&usbdev->dev, "out of urbs");
371 kfree(urbtrack);
372 return -ENOMEM;
373 }
374 setup.bRequestType = (__u8)0x40;
375 setup.bRequest = (__u8)0x0e;
376 setup.wValue = get_reg_value(reg, dummy);
377 setup.wIndex = get_reg_index(reg);
378 setup.wLength = 0;
379 usb_fill_control_urb(urbtrack->urb, usbdev,
380 usb_sndctrlpipe(usbdev, 0),
381 (unsigned char *)&setup,
382 NULL, 0, async_complete, urbtrack);
383 kref_init(&urbtrack->ref_count);
384 INIT_LIST_HEAD(&urbtrack->urblist_entry);
385
386 /*
387 * get the disconnect mutex, or add tracker to the deferred_urbs list
388 * and schedule a tasklet to try again later
389 */
390 if (!mutex_trylock(&serial->disc_mutex)) {
391 spin_lock_irqsave(&mos_parport->listlock, flags);
392 list_add_tail(&urbtrack->urblist_entry,
393 &mos_parport->deferred_urbs);
394 spin_unlock_irqrestore(&mos_parport->listlock, flags);
395 tasklet_schedule(&mos_parport->urb_tasklet);
396 dbg("tasklet scheduled");
397 return 0;
398 }
399
400 /* bail if device disconnected */
401 if (serial->disconnected) {
402 kref_put(&urbtrack->ref_count, destroy_urbtracker);
403 mutex_unlock(&serial->disc_mutex);
404 return -ENODEV;
405 }
406
407 /* add the tracker to the active_urbs list and submit */
408 spin_lock_irqsave(&mos_parport->listlock, flags);
409 list_add_tail(&urbtrack->urblist_entry, &mos_parport->active_urbs);
410 spin_unlock_irqrestore(&mos_parport->listlock, flags);
411 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
412 mutex_unlock(&serial->disc_mutex);
413 if (ret_val) {
414 dev_err(&usbdev->dev,
415 "%s: submit_urb() failed: %d", __func__, ret_val);
416 spin_lock_irqsave(&mos_parport->listlock, flags);
417 list_del(&urbtrack->urblist_entry);
418 spin_unlock_irqrestore(&mos_parport->listlock, flags);
419 kref_put(&urbtrack->ref_count, destroy_urbtracker);
420 return ret_val;
421 }
422 return 0;
423 }
424
425 /*
426 * This is the the common top part of all parallel port callback operations that
427 * send synchronous messages to the device. This implements convoluted locking
428 * that avoids two scenarios: (1) a port operation is called after usbserial
429 * has called our release function, at which point struct mos7715_parport has
430 * been destroyed, and (2) the device has been disconnected, but usbserial has
431 * not called the release function yet because someone has a serial port open.
432 * The shared release_lock prevents the first, and the mutex and disconnected
433 * flag maintained by usbserial covers the second. We also use the msg_pending
434 * flag to ensure that all synchronous usb messgage calls have completed before
435 * our release function can return.
436 */
437 static int parport_prologue(struct parport *pp)
438 {
439 struct mos7715_parport *mos_parport;
440
441 spin_lock(&release_lock);
442 mos_parport = pp->private_data;
443 if (unlikely(mos_parport == NULL)) {
444 /* release fn called, port struct destroyed */
445 spin_unlock(&release_lock);
446 return -1;
447 }
448 mos_parport->msg_pending = true; /* synch usb call pending */
449 INIT_COMPLETION(mos_parport->syncmsg_compl);
450 spin_unlock(&release_lock);
451
452 mutex_lock(&mos_parport->serial->disc_mutex);
453 if (mos_parport->serial->disconnected) {
454 /* device disconnected */
455 mutex_unlock(&mos_parport->serial->disc_mutex);
456 mos_parport->msg_pending = false;
457 complete(&mos_parport->syncmsg_compl);
458 return -1;
459 }
460
461 return 0;
462 }
463
464 /*
465 * This is the the common bottom part of all parallel port functions that send
466 * synchronous messages to the device.
467 */
468 static inline void parport_epilogue(struct parport *pp)
469 {
470 struct mos7715_parport *mos_parport = pp->private_data;
471 mutex_unlock(&mos_parport->serial->disc_mutex);
472 mos_parport->msg_pending = false;
473 complete(&mos_parport->syncmsg_compl);
474 }
475
476 static void parport_mos7715_write_data(struct parport *pp, unsigned char d)
477 {
478 struct mos7715_parport *mos_parport = pp->private_data;
479 dbg("%s called: %2.2x", __func__, d);
480 if (parport_prologue(pp) < 0)
481 return;
482 mos7715_change_mode(mos_parport, SPP);
483 write_mos_reg(mos_parport->serial, dummy, DPR, (__u8)d);
484 parport_epilogue(pp);
485 }
486
487 static unsigned char parport_mos7715_read_data(struct parport *pp)
488 {
489 struct mos7715_parport *mos_parport = pp->private_data;
490 unsigned char d;
491 dbg("%s called", __func__);
492 if (parport_prologue(pp) < 0)
493 return 0;
494 read_mos_reg(mos_parport->serial, dummy, DPR, &d);
495 parport_epilogue(pp);
496 return d;
497 }
498
499 static void parport_mos7715_write_control(struct parport *pp, unsigned char d)
500 {
501 struct mos7715_parport *mos_parport = pp->private_data;
502 __u8 data;
503 dbg("%s called: %2.2x", __func__, d);
504 if (parport_prologue(pp) < 0)
505 return;
506 data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0);
507 write_mos_reg(mos_parport->serial, dummy, DCR, data);
508 mos_parport->shadowDCR = data;
509 parport_epilogue(pp);
510 }
511
512 static unsigned char parport_mos7715_read_control(struct parport *pp)
513 {
514 struct mos7715_parport *mos_parport = pp->private_data;
515 __u8 dcr;
516 dbg("%s called", __func__);
517 spin_lock(&release_lock);
518 mos_parport = pp->private_data;
519 if (unlikely(mos_parport == NULL)) {
520 spin_unlock(&release_lock);
521 return 0;
522 }
523 dcr = mos_parport->shadowDCR & 0x0f;
524 spin_unlock(&release_lock);
525 return dcr;
526 }
527
528 static unsigned char parport_mos7715_frob_control(struct parport *pp,
529 unsigned char mask,
530 unsigned char val)
531 {
532 struct mos7715_parport *mos_parport = pp->private_data;
533 __u8 dcr;
534 dbg("%s called", __func__);
535 mask &= 0x0f;
536 val &= 0x0f;
537 if (parport_prologue(pp) < 0)
538 return 0;
539 mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val;
540 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
541 dcr = mos_parport->shadowDCR & 0x0f;
542 parport_epilogue(pp);
543 return dcr;
544 }
545
546 static unsigned char parport_mos7715_read_status(struct parport *pp)
547 {
548 unsigned char status;
549 struct mos7715_parport *mos_parport = pp->private_data;
550 dbg("%s called", __func__);
551 spin_lock(&release_lock);
552 mos_parport = pp->private_data;
553 if (unlikely(mos_parport == NULL)) { /* release called */
554 spin_unlock(&release_lock);
555 return 0;
556 }
557 status = atomic_read(&mos_parport->shadowDSR) & 0xf8;
558 spin_unlock(&release_lock);
559 return status;
560 }
561
562 static void parport_mos7715_enable_irq(struct parport *pp)
563 {
564 dbg("%s called", __func__);
565 }
566 static void parport_mos7715_disable_irq(struct parport *pp)
567 {
568 dbg("%s called", __func__);
569 }
570
571 static void parport_mos7715_data_forward(struct parport *pp)
572 {
573 struct mos7715_parport *mos_parport = pp->private_data;
574 dbg("%s called", __func__);
575 if (parport_prologue(pp) < 0)
576 return;
577 mos7715_change_mode(mos_parport, PS2);
578 mos_parport->shadowDCR &= ~0x20;
579 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
580 parport_epilogue(pp);
581 }
582
583 static void parport_mos7715_data_reverse(struct parport *pp)
584 {
585 struct mos7715_parport *mos_parport = pp->private_data;
586 dbg("%s called", __func__);
587 if (parport_prologue(pp) < 0)
588 return;
589 mos7715_change_mode(mos_parport, PS2);
590 mos_parport->shadowDCR |= 0x20;
591 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
592 parport_epilogue(pp);
593 }
594
595 static void parport_mos7715_init_state(struct pardevice *dev,
596 struct parport_state *s)
597 {
598 dbg("%s called", __func__);
599 s->u.pc.ctr = DCR_INIT_VAL;
600 s->u.pc.ecr = ECR_INIT_VAL;
601 }
602
603 /* N.B. Parport core code requires that this function not block */
604 static void parport_mos7715_save_state(struct parport *pp,
605 struct parport_state *s)
606 {
607 struct mos7715_parport *mos_parport;
608 dbg("%s called", __func__);
609 spin_lock(&release_lock);
610 mos_parport = pp->private_data;
611 if (unlikely(mos_parport == NULL)) { /* release called */
612 spin_unlock(&release_lock);
613 return;
614 }
615 s->u.pc.ctr = mos_parport->shadowDCR;
616 s->u.pc.ecr = mos_parport->shadowECR;
617 spin_unlock(&release_lock);
618 }
619
620 /* N.B. Parport core code requires that this function not block */
621 static void parport_mos7715_restore_state(struct parport *pp,
622 struct parport_state *s)
623 {
624 struct mos7715_parport *mos_parport;
625 dbg("%s called", __func__);
626 spin_lock(&release_lock);
627 mos_parport = pp->private_data;
628 if (unlikely(mos_parport == NULL)) { /* release called */
629 spin_unlock(&release_lock);
630 return;
631 }
632 write_parport_reg_nonblock(mos_parport, DCR, mos_parport->shadowDCR);
633 write_parport_reg_nonblock(mos_parport, ECR, mos_parport->shadowECR);
634 spin_unlock(&release_lock);
635 }
636
637 static size_t parport_mos7715_write_compat(struct parport *pp,
638 const void *buffer,
639 size_t len, int flags)
640 {
641 int retval;
642 struct mos7715_parport *mos_parport = pp->private_data;
643 int actual_len;
644 dbg("%s called: %u chars", __func__, (unsigned int)len);
645 if (parport_prologue(pp) < 0)
646 return 0;
647 mos7715_change_mode(mos_parport, PPF);
648 retval = usb_bulk_msg(mos_parport->serial->dev,
649 usb_sndbulkpipe(mos_parport->serial->dev, 2),
650 (void *)buffer, len, &actual_len,
651 MOS_WDR_TIMEOUT);
652 parport_epilogue(pp);
653 if (retval) {
654 dev_err(&mos_parport->serial->dev->dev,
655 "mos7720: usb_bulk_msg() failed: %d", retval);
656 return 0;
657 }
658 return actual_len;
659 }
660
661 static struct parport_operations parport_mos7715_ops = {
662 .owner = THIS_MODULE,
663 .write_data = parport_mos7715_write_data,
664 .read_data = parport_mos7715_read_data,
665
666 .write_control = parport_mos7715_write_control,
667 .read_control = parport_mos7715_read_control,
668 .frob_control = parport_mos7715_frob_control,
669
670 .read_status = parport_mos7715_read_status,
671
672 .enable_irq = parport_mos7715_enable_irq,
673 .disable_irq = parport_mos7715_disable_irq,
674
675 .data_forward = parport_mos7715_data_forward,
676 .data_reverse = parport_mos7715_data_reverse,
677
678 .init_state = parport_mos7715_init_state,
679 .save_state = parport_mos7715_save_state,
680 .restore_state = parport_mos7715_restore_state,
681
682 .compat_write_data = parport_mos7715_write_compat,
683
684 .nibble_read_data = parport_ieee1284_read_nibble,
685 .byte_read_data = parport_ieee1284_read_byte,
686 };
687
688 /*
689 * Allocate and initialize parallel port control struct, initialize
690 * the parallel port hardware device, and register with the parport subsystem.
691 */
692 static int mos7715_parport_init(struct usb_serial *serial)
693 {
694 struct mos7715_parport *mos_parport;
695
696 /* allocate and initialize parallel port control struct */
697 mos_parport = kzalloc(sizeof(struct mos7715_parport), GFP_KERNEL);
698 if (mos_parport == NULL) {
699 dbg("mos7715_parport_init: kzalloc failed");
700 return -ENOMEM;
701 }
702 mos_parport->msg_pending = false;
703 kref_init(&mos_parport->ref_count);
704 spin_lock_init(&mos_parport->listlock);
705 INIT_LIST_HEAD(&mos_parport->active_urbs);
706 INIT_LIST_HEAD(&mos_parport->deferred_urbs);
707 usb_set_serial_data(serial, mos_parport); /* hijack private pointer */
708 mos_parport->serial = serial;
709 tasklet_init(&mos_parport->urb_tasklet, send_deferred_urbs,
710 (unsigned long) mos_parport);
711 init_completion(&mos_parport->syncmsg_compl);
712
713 /* cycle parallel port reset bit */
714 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x80);
715 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x00);
716
717 /* initialize device registers */
718 mos_parport->shadowDCR = DCR_INIT_VAL;
719 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
720 mos_parport->shadowECR = ECR_INIT_VAL;
721 write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR);
722
723 /* register with parport core */
724 mos_parport->pp = parport_register_port(0, PARPORT_IRQ_NONE,
725 PARPORT_DMA_NONE,
726 &parport_mos7715_ops);
727 if (mos_parport->pp == NULL) {
728 dev_err(&serial->interface->dev,
729 "Could not register parport\n");
730 kref_put(&mos_parport->ref_count, destroy_mos_parport);
731 return -EIO;
732 }
733 mos_parport->pp->private_data = mos_parport;
734 mos_parport->pp->modes = PARPORT_MODE_COMPAT | PARPORT_MODE_PCSPP;
735 mos_parport->pp->dev = &serial->interface->dev;
736 parport_announce_port(mos_parport->pp);
737
738 return 0;
739 }
740 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
741
742 /*
743 * mos7720_interrupt_callback
744 * this is the callback function for when we have received data on the
745 * interrupt endpoint.
746 */
747 static void mos7720_interrupt_callback(struct urb *urb)
748 {
749 int result;
750 int length;
751 int status = urb->status;
752 __u8 *data;
753 __u8 sp1;
754 __u8 sp2;
755
756 switch (status) {
757 case 0:
758 /* success */
759 break;
760 case -ECONNRESET:
761 case -ENOENT:
762 case -ESHUTDOWN:
763 /* this urb is terminated, clean up */
764 dbg("%s - urb shutting down with status: %d", __func__,
765 status);
766 return;
767 default:
768 dbg("%s - nonzero urb status received: %d", __func__,
769 status);
770 goto exit;
771 }
772
773 length = urb->actual_length;
774 data = urb->transfer_buffer;
775
776 /* Moschip get 4 bytes
777 * Byte 1 IIR Port 1 (port.number is 0)
778 * Byte 2 IIR Port 2 (port.number is 1)
779 * Byte 3 --------------
780 * Byte 4 FIFO status for both */
781
782 /* the above description is inverted
783 * oneukum 2007-03-14 */
784
785 if (unlikely(length != 4)) {
786 dbg("Wrong data !!!");
787 return;
788 }
789
790 sp1 = data[3];
791 sp2 = data[2];
792
793 if ((sp1 | sp2) & 0x01) {
794 /* No Interrupt Pending in both the ports */
795 dbg("No Interrupt !!!");
796 } else {
797 switch (sp1 & 0x0f) {
798 case SERIAL_IIR_RLS:
799 dbg("Serial Port 1: Receiver status error or address "
800 "bit detected in 9-bit mode\n");
801 break;
802 case SERIAL_IIR_CTI:
803 dbg("Serial Port 1: Receiver time out");
804 break;
805 case SERIAL_IIR_MS:
806 /* dbg("Serial Port 1: Modem status change"); */
807 break;
808 }
809
810 switch (sp2 & 0x0f) {
811 case SERIAL_IIR_RLS:
812 dbg("Serial Port 2: Receiver status error or address "
813 "bit detected in 9-bit mode");
814 break;
815 case SERIAL_IIR_CTI:
816 dbg("Serial Port 2: Receiver time out");
817 break;
818 case SERIAL_IIR_MS:
819 /* dbg("Serial Port 2: Modem status change"); */
820 break;
821 }
822 }
823
824 exit:
825 result = usb_submit_urb(urb, GFP_ATOMIC);
826 if (result)
827 dev_err(&urb->dev->dev,
828 "%s - Error %d submitting control urb\n",
829 __func__, result);
830 }
831
832 /*
833 * mos7715_interrupt_callback
834 * this is the 7715's callback function for when we have received data on
835 * the interrupt endpoint.
836 */
837 static void mos7715_interrupt_callback(struct urb *urb)
838 {
839 int result;
840 int length;
841 int status = urb->status;
842 __u8 *data;
843 __u8 iir;
844
845 switch (status) {
846 case 0:
847 /* success */
848 break;
849 case -ECONNRESET:
850 case -ENOENT:
851 case -ESHUTDOWN:
852 case -ENODEV:
853 /* this urb is terminated, clean up */
854 dbg("%s - urb shutting down with status: %d", __func__,
855 status);
856 return;
857 default:
858 dbg("%s - nonzero urb status received: %d", __func__,
859 status);
860 goto exit;
861 }
862
863 length = urb->actual_length;
864 data = urb->transfer_buffer;
865
866 /* Structure of data from 7715 device:
867 * Byte 1: IIR serial Port
868 * Byte 2: unused
869 * Byte 2: DSR parallel port
870 * Byte 4: FIFO status for both */
871
872 if (unlikely(length != 4)) {
873 dbg("Wrong data !!!");
874 return;
875 }
876
877 iir = data[0];
878 if (!(iir & 0x01)) { /* serial port interrupt pending */
879 switch (iir & 0x0f) {
880 case SERIAL_IIR_RLS:
881 dbg("Serial Port: Receiver status error or address "
882 "bit detected in 9-bit mode\n");
883 break;
884 case SERIAL_IIR_CTI:
885 dbg("Serial Port: Receiver time out");
886 break;
887 case SERIAL_IIR_MS:
888 /* dbg("Serial Port: Modem status change"); */
889 break;
890 }
891 }
892
893 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
894 { /* update local copy of DSR reg */
895 struct usb_serial_port *port = urb->context;
896 struct mos7715_parport *mos_parport = port->serial->private;
897 if (unlikely(mos_parport == NULL))
898 return;
899 atomic_set(&mos_parport->shadowDSR, data[2]);
900 }
901 #endif
902
903 exit:
904 result = usb_submit_urb(urb, GFP_ATOMIC);
905 if (result)
906 dev_err(&urb->dev->dev,
907 "%s - Error %d submitting control urb\n",
908 __func__, result);
909 }
910
911 /*
912 * mos7720_bulk_in_callback
913 * this is the callback function for when we have received data on the
914 * bulk in endpoint.
915 */
916 static void mos7720_bulk_in_callback(struct urb *urb)
917 {
918 int retval;
919 unsigned char *data ;
920 struct usb_serial_port *port;
921 struct tty_struct *tty;
922 int status = urb->status;
923
924 if (status) {
925 dbg("nonzero read bulk status received: %d", status);
926 return;
927 }
928
929 port = urb->context;
930
931 dbg("Entering...%s", __func__);
932
933 data = urb->transfer_buffer;
934
935 tty = tty_port_tty_get(&port->port);
936 if (tty && urb->actual_length) {
937 tty_insert_flip_string(tty, data, urb->actual_length);
938 tty_flip_buffer_push(tty);
939 }
940 tty_kref_put(tty);
941
942 if (!port->read_urb) {
943 dbg("URB KILLED !!!");
944 return;
945 }
946
947 if (port->read_urb->status != -EINPROGRESS) {
948 port->read_urb->dev = port->serial->dev;
949
950 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
951 if (retval)
952 dbg("usb_submit_urb(read bulk) failed, retval = %d",
953 retval);
954 }
955 }
956
957 /*
958 * mos7720_bulk_out_data_callback
959 * this is the callback function for when we have finished sending serial
960 * data on the bulk out endpoint.
961 */
962 static void mos7720_bulk_out_data_callback(struct urb *urb)
963 {
964 struct moschip_port *mos7720_port;
965 struct tty_struct *tty;
966 int status = urb->status;
967
968 if (status) {
969 dbg("nonzero write bulk status received:%d", status);
970 return;
971 }
972
973 mos7720_port = urb->context;
974 if (!mos7720_port) {
975 dbg("NULL mos7720_port pointer");
976 return ;
977 }
978
979 tty = tty_port_tty_get(&mos7720_port->port->port);
980
981 if (tty && mos7720_port->open)
982 tty_wakeup(tty);
983 tty_kref_put(tty);
984 }
985
986 /*
987 * mos77xx_probe
988 * this function installs the appropriate read interrupt endpoint callback
989 * depending on whether the device is a 7720 or 7715, thus avoiding costly
990 * run-time checks in the high-frequency callback routine itself.
991 */
992 static int mos77xx_probe(struct usb_serial *serial,
993 const struct usb_device_id *id)
994 {
995 if (id->idProduct == MOSCHIP_DEVICE_ID_7715)
996 moschip7720_2port_driver.read_int_callback =
997 mos7715_interrupt_callback;
998 else
999 moschip7720_2port_driver.read_int_callback =
1000 mos7720_interrupt_callback;
1001
1002 return 0;
1003 }
1004
1005 static int mos77xx_calc_num_ports(struct usb_serial *serial)
1006 {
1007 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
1008 if (product == MOSCHIP_DEVICE_ID_7715)
1009 return 1;
1010
1011 return 2;
1012 }
1013
1014 static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port)
1015 {
1016 struct usb_serial *serial;
1017 struct usb_serial_port *port0;
1018 struct urb *urb;
1019 struct moschip_port *mos7720_port;
1020 int response;
1021 int port_number;
1022 __u8 data;
1023 int allocated_urbs = 0;
1024 int j;
1025
1026 serial = port->serial;
1027
1028 mos7720_port = usb_get_serial_port_data(port);
1029 if (mos7720_port == NULL)
1030 return -ENODEV;
1031
1032 port0 = serial->port[0];
1033
1034 usb_clear_halt(serial->dev, port->write_urb->pipe);
1035 usb_clear_halt(serial->dev, port->read_urb->pipe);
1036
1037 /* Initialising the write urb pool */
1038 for (j = 0; j < NUM_URBS; ++j) {
1039 urb = usb_alloc_urb(0, GFP_KERNEL);
1040 mos7720_port->write_urb_pool[j] = urb;
1041
1042 if (urb == NULL) {
1043 dev_err(&port->dev, "No more urbs???\n");
1044 continue;
1045 }
1046
1047 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1048 GFP_KERNEL);
1049 if (!urb->transfer_buffer) {
1050 dev_err(&port->dev,
1051 "%s-out of memory for urb buffers.\n",
1052 __func__);
1053 usb_free_urb(mos7720_port->write_urb_pool[j]);
1054 mos7720_port->write_urb_pool[j] = NULL;
1055 continue;
1056 }
1057 allocated_urbs++;
1058 }
1059
1060 if (!allocated_urbs)
1061 return -ENOMEM;
1062
1063 /* Initialize MCS7720 -- Write Init values to corresponding Registers
1064 *
1065 * Register Index
1066 * 0 : THR/RHR
1067 * 1 : IER
1068 * 2 : FCR
1069 * 3 : LCR
1070 * 4 : MCR
1071 * 5 : LSR
1072 * 6 : MSR
1073 * 7 : SPR
1074 *
1075 * 0x08 : SP1/2 Control Reg
1076 */
1077 port_number = port->number - port->serial->minor;
1078 read_mos_reg(serial, port_number, LSR, &data);
1079
1080 dbg("SS::%p LSR:%x", mos7720_port, data);
1081
1082 dbg("Check:Sending Command ..........");
1083
1084 write_mos_reg(serial, dummy, SP1_REG, 0x02);
1085 write_mos_reg(serial, dummy, SP2_REG, 0x02);
1086
1087 write_mos_reg(serial, port_number, IER, 0x00);
1088 write_mos_reg(serial, port_number, FCR, 0x00);
1089
1090 write_mos_reg(serial, port_number, FCR, 0xcf);
1091 mos7720_port->shadowLCR = 0x03;
1092 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1093 mos7720_port->shadowMCR = 0x0b;
1094 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1095
1096 write_mos_reg(serial, port_number, SP_CONTROL_REG, 0x00);
1097 read_mos_reg(serial, dummy, SP_CONTROL_REG, &data);
1098 data = data | (port->number - port->serial->minor + 1);
1099 write_mos_reg(serial, dummy, SP_CONTROL_REG, data);
1100 mos7720_port->shadowLCR = 0x83;
1101 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1102 write_mos_reg(serial, port_number, THR, 0x0c);
1103 write_mos_reg(serial, port_number, IER, 0x00);
1104 mos7720_port->shadowLCR = 0x03;
1105 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1106 write_mos_reg(serial, port_number, IER, 0x0c);
1107
1108 response = usb_submit_urb(port->read_urb, GFP_KERNEL);
1109 if (response)
1110 dev_err(&port->dev, "%s - Error %d submitting read urb\n",
1111 __func__, response);
1112
1113 /* initialize our icount structure */
1114 memset(&(mos7720_port->icount), 0x00, sizeof(mos7720_port->icount));
1115
1116 /* initialize our port settings */
1117 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */
1118
1119 /* send a open port command */
1120 mos7720_port->open = 1;
1121
1122 return 0;
1123 }
1124
1125 /*
1126 * mos7720_chars_in_buffer
1127 * this function is called by the tty driver when it wants to know how many
1128 * bytes of data we currently have outstanding in the port (data that has
1129 * been written, but hasn't made it out the port yet)
1130 * If successful, we return the number of bytes left to be written in the
1131 * system,
1132 * Otherwise we return a negative error number.
1133 */
1134 static int mos7720_chars_in_buffer(struct tty_struct *tty)
1135 {
1136 struct usb_serial_port *port = tty->driver_data;
1137 int i;
1138 int chars = 0;
1139 struct moschip_port *mos7720_port;
1140
1141 dbg("%s:entering ...........", __func__);
1142
1143 mos7720_port = usb_get_serial_port_data(port);
1144 if (mos7720_port == NULL) {
1145 dbg("%s:leaving ...........", __func__);
1146 return 0;
1147 }
1148
1149 for (i = 0; i < NUM_URBS; ++i) {
1150 if (mos7720_port->write_urb_pool[i] &&
1151 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS)
1152 chars += URB_TRANSFER_BUFFER_SIZE;
1153 }
1154 dbg("%s - returns %d", __func__, chars);
1155 return chars;
1156 }
1157
1158 static void mos7720_close(struct usb_serial_port *port)
1159 {
1160 struct usb_serial *serial;
1161 struct moschip_port *mos7720_port;
1162 int j;
1163
1164 dbg("mos7720_close:entering...");
1165
1166 serial = port->serial;
1167
1168 mos7720_port = usb_get_serial_port_data(port);
1169 if (mos7720_port == NULL)
1170 return;
1171
1172 for (j = 0; j < NUM_URBS; ++j)
1173 usb_kill_urb(mos7720_port->write_urb_pool[j]);
1174
1175 /* Freeing Write URBs */
1176 for (j = 0; j < NUM_URBS; ++j) {
1177 if (mos7720_port->write_urb_pool[j]) {
1178 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer);
1179 usb_free_urb(mos7720_port->write_urb_pool[j]);
1180 }
1181 }
1182
1183 /* While closing port, shutdown all bulk read, write *
1184 * and interrupt read if they exists, otherwise nop */
1185 dbg("Shutdown bulk write");
1186 usb_kill_urb(port->write_urb);
1187 dbg("Shutdown bulk read");
1188 usb_kill_urb(port->read_urb);
1189
1190 mutex_lock(&serial->disc_mutex);
1191 /* these commands must not be issued if the device has
1192 * been disconnected */
1193 if (!serial->disconnected) {
1194 write_mos_reg(serial, port->number - port->serial->minor,
1195 MCR, 0x00);
1196 write_mos_reg(serial, port->number - port->serial->minor,
1197 IER, 0x00);
1198 }
1199 mutex_unlock(&serial->disc_mutex);
1200 mos7720_port->open = 0;
1201
1202 dbg("Leaving %s", __func__);
1203 }
1204
1205 static void mos7720_break(struct tty_struct *tty, int break_state)
1206 {
1207 struct usb_serial_port *port = tty->driver_data;
1208 unsigned char data;
1209 struct usb_serial *serial;
1210 struct moschip_port *mos7720_port;
1211
1212 dbg("Entering %s", __func__);
1213
1214 serial = port->serial;
1215
1216 mos7720_port = usb_get_serial_port_data(port);
1217 if (mos7720_port == NULL)
1218 return;
1219
1220 if (break_state == -1)
1221 data = mos7720_port->shadowLCR | UART_LCR_SBC;
1222 else
1223 data = mos7720_port->shadowLCR & ~UART_LCR_SBC;
1224
1225 mos7720_port->shadowLCR = data;
1226 write_mos_reg(serial, port->number - port->serial->minor,
1227 LCR, mos7720_port->shadowLCR);
1228 }
1229
1230 /*
1231 * mos7720_write_room
1232 * this function is called by the tty driver when it wants to know how many
1233 * bytes of data we can accept for a specific port.
1234 * If successful, we return the amount of room that we have for this port
1235 * Otherwise we return a negative error number.
1236 */
1237 static int mos7720_write_room(struct tty_struct *tty)
1238 {
1239 struct usb_serial_port *port = tty->driver_data;
1240 struct moschip_port *mos7720_port;
1241 int room = 0;
1242 int i;
1243
1244 dbg("%s:entering ...........", __func__);
1245
1246 mos7720_port = usb_get_serial_port_data(port);
1247 if (mos7720_port == NULL) {
1248 dbg("%s:leaving ...........", __func__);
1249 return -ENODEV;
1250 }
1251
1252 /* FIXME: Locking */
1253 for (i = 0; i < NUM_URBS; ++i) {
1254 if (mos7720_port->write_urb_pool[i] &&
1255 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS)
1256 room += URB_TRANSFER_BUFFER_SIZE;
1257 }
1258
1259 dbg("%s - returns %d", __func__, room);
1260 return room;
1261 }
1262
1263 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port,
1264 const unsigned char *data, int count)
1265 {
1266 int status;
1267 int i;
1268 int bytes_sent = 0;
1269 int transfer_size;
1270
1271 struct moschip_port *mos7720_port;
1272 struct usb_serial *serial;
1273 struct urb *urb;
1274 const unsigned char *current_position = data;
1275
1276 dbg("%s:entering ...........", __func__);
1277
1278 serial = port->serial;
1279
1280 mos7720_port = usb_get_serial_port_data(port);
1281 if (mos7720_port == NULL) {
1282 dbg("mos7720_port is NULL");
1283 return -ENODEV;
1284 }
1285
1286 /* try to find a free urb in the list */
1287 urb = NULL;
1288
1289 for (i = 0; i < NUM_URBS; ++i) {
1290 if (mos7720_port->write_urb_pool[i] &&
1291 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) {
1292 urb = mos7720_port->write_urb_pool[i];
1293 dbg("URB:%d", i);
1294 break;
1295 }
1296 }
1297
1298 if (urb == NULL) {
1299 dbg("%s - no more free urbs", __func__);
1300 goto exit;
1301 }
1302
1303 if (urb->transfer_buffer == NULL) {
1304 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1305 GFP_KERNEL);
1306 if (urb->transfer_buffer == NULL) {
1307 dev_err(&port->dev, "%s no more kernel memory...\n",
1308 __func__);
1309 goto exit;
1310 }
1311 }
1312 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1313
1314 memcpy(urb->transfer_buffer, current_position, transfer_size);
1315 usb_serial_debug_data(debug, &port->dev, __func__, transfer_size,
1316 urb->transfer_buffer);
1317
1318 /* fill urb with data and submit */
1319 usb_fill_bulk_urb(urb, serial->dev,
1320 usb_sndbulkpipe(serial->dev,
1321 port->bulk_out_endpointAddress),
1322 urb->transfer_buffer, transfer_size,
1323 mos7720_bulk_out_data_callback, mos7720_port);
1324
1325 /* send it down the pipe */
1326 status = usb_submit_urb(urb, GFP_ATOMIC);
1327 if (status) {
1328 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1329 "with status = %d\n", __func__, status);
1330 bytes_sent = status;
1331 goto exit;
1332 }
1333 bytes_sent = transfer_size;
1334
1335 exit:
1336 return bytes_sent;
1337 }
1338
1339 static void mos7720_throttle(struct tty_struct *tty)
1340 {
1341 struct usb_serial_port *port = tty->driver_data;
1342 struct moschip_port *mos7720_port;
1343 int status;
1344
1345 dbg("%s- port %d", __func__, port->number);
1346
1347 mos7720_port = usb_get_serial_port_data(port);
1348
1349 if (mos7720_port == NULL)
1350 return;
1351
1352 if (!mos7720_port->open) {
1353 dbg("port not opened");
1354 return;
1355 }
1356
1357 dbg("%s: Entering ..........", __func__);
1358
1359 /* if we are implementing XON/XOFF, send the stop character */
1360 if (I_IXOFF(tty)) {
1361 unsigned char stop_char = STOP_CHAR(tty);
1362 status = mos7720_write(tty, port, &stop_char, 1);
1363 if (status <= 0)
1364 return;
1365 }
1366
1367 /* if we are implementing RTS/CTS, toggle that line */
1368 if (tty->termios->c_cflag & CRTSCTS) {
1369 mos7720_port->shadowMCR &= ~UART_MCR_RTS;
1370 write_mos_reg(port->serial, port->number - port->serial->minor,
1371 MCR, mos7720_port->shadowMCR);
1372 if (status != 0)
1373 return;
1374 }
1375 }
1376
1377 static void mos7720_unthrottle(struct tty_struct *tty)
1378 {
1379 struct usb_serial_port *port = tty->driver_data;
1380 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1381 int status;
1382
1383 if (mos7720_port == NULL)
1384 return;
1385
1386 if (!mos7720_port->open) {
1387 dbg("%s - port not opened", __func__);
1388 return;
1389 }
1390
1391 dbg("%s: Entering ..........", __func__);
1392
1393 /* if we are implementing XON/XOFF, send the start character */
1394 if (I_IXOFF(tty)) {
1395 unsigned char start_char = START_CHAR(tty);
1396 status = mos7720_write(tty, port, &start_char, 1);
1397 if (status <= 0)
1398 return;
1399 }
1400
1401 /* if we are implementing RTS/CTS, toggle that line */
1402 if (tty->termios->c_cflag & CRTSCTS) {
1403 mos7720_port->shadowMCR |= UART_MCR_RTS;
1404 write_mos_reg(port->serial, port->number - port->serial->minor,
1405 MCR, mos7720_port->shadowMCR);
1406 if (status != 0)
1407 return;
1408 }
1409 }
1410
1411 /* FIXME: this function does not work */
1412 static int set_higher_rates(struct moschip_port *mos7720_port,
1413 unsigned int baud)
1414 {
1415 struct usb_serial_port *port;
1416 struct usb_serial *serial;
1417 int port_number;
1418 enum mos_regs sp_reg;
1419 if (mos7720_port == NULL)
1420 return -EINVAL;
1421
1422 port = mos7720_port->port;
1423 serial = port->serial;
1424
1425 /***********************************************
1426 * Init Sequence for higher rates
1427 ***********************************************/
1428 dbg("Sending Setting Commands ..........");
1429 port_number = port->number - port->serial->minor;
1430
1431 write_mos_reg(serial, port_number, IER, 0x00);
1432 write_mos_reg(serial, port_number, FCR, 0x00);
1433 write_mos_reg(serial, port_number, FCR, 0xcf);
1434 mos7720_port->shadowMCR = 0x0b;
1435 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1436 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x00);
1437
1438 /***********************************************
1439 * Set for higher rates *
1440 ***********************************************/
1441 /* writing baud rate verbatum into uart clock field clearly not right */
1442 if (port_number == 0)
1443 sp_reg = SP1_REG;
1444 else
1445 sp_reg = SP2_REG;
1446 write_mos_reg(serial, dummy, sp_reg, baud * 0x10);
1447 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x03);
1448 mos7720_port->shadowMCR = 0x2b;
1449 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1450
1451 /***********************************************
1452 * Set DLL/DLM
1453 ***********************************************/
1454 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1455 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1456 write_mos_reg(serial, port_number, DLL, 0x01);
1457 write_mos_reg(serial, port_number, DLM, 0x00);
1458 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1459 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1460
1461 return 0;
1462 }
1463
1464 /* baud rate information */
1465 struct divisor_table_entry {
1466 __u32 baudrate;
1467 __u16 divisor;
1468 };
1469
1470 /* Define table of divisors for moschip 7720 hardware *
1471 * These assume a 3.6864MHz crystal, the standard /16, and *
1472 * MCR.7 = 0. */
1473 static struct divisor_table_entry divisor_table[] = {
1474 { 50, 2304},
1475 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */
1476 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */
1477 { 150, 768},
1478 { 300, 384},
1479 { 600, 192},
1480 { 1200, 96},
1481 { 1800, 64},
1482 { 2400, 48},
1483 { 4800, 24},
1484 { 7200, 16},
1485 { 9600, 12},
1486 { 19200, 6},
1487 { 38400, 3},
1488 { 57600, 2},
1489 { 115200, 1},
1490 };
1491
1492 /*****************************************************************************
1493 * calc_baud_rate_divisor
1494 * this function calculates the proper baud rate divisor for the specified
1495 * baud rate.
1496 *****************************************************************************/
1497 static int calc_baud_rate_divisor(int baudrate, int *divisor)
1498 {
1499 int i;
1500 __u16 custom;
1501 __u16 round1;
1502 __u16 round;
1503
1504
1505 dbg("%s - %d", __func__, baudrate);
1506
1507 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) {
1508 if (divisor_table[i].baudrate == baudrate) {
1509 *divisor = divisor_table[i].divisor;
1510 return 0;
1511 }
1512 }
1513
1514 /* After trying for all the standard baud rates *
1515 * Try calculating the divisor for this baud rate */
1516 if (baudrate > 75 && baudrate < 230400) {
1517 /* get the divisor */
1518 custom = (__u16)(230400L / baudrate);
1519
1520 /* Check for round off */
1521 round1 = (__u16)(2304000L / baudrate);
1522 round = (__u16)(round1 - (custom * 10));
1523 if (round > 4)
1524 custom++;
1525 *divisor = custom;
1526
1527 dbg("Baud %d = %d", baudrate, custom);
1528 return 0;
1529 }
1530
1531 dbg("Baud calculation Failed...");
1532 return -EINVAL;
1533 }
1534
1535 /*
1536 * send_cmd_write_baud_rate
1537 * this function sends the proper command to change the baud rate of the
1538 * specified port.
1539 */
1540 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port,
1541 int baudrate)
1542 {
1543 struct usb_serial_port *port;
1544 struct usb_serial *serial;
1545 int divisor;
1546 int status;
1547 unsigned char number;
1548
1549 if (mos7720_port == NULL)
1550 return -1;
1551
1552 port = mos7720_port->port;
1553 serial = port->serial;
1554
1555 dbg("%s: Entering ..........", __func__);
1556
1557 number = port->number - port->serial->minor;
1558 dbg("%s - port = %d, baud = %d", __func__, port->number, baudrate);
1559
1560 /* Calculate the Divisor */
1561 status = calc_baud_rate_divisor(baudrate, &divisor);
1562 if (status) {
1563 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1564 return status;
1565 }
1566
1567 /* Enable access to divisor latch */
1568 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1569 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR);
1570
1571 /* Write the divisor */
1572 write_mos_reg(serial, number, DLL, (__u8)(divisor & 0xff));
1573 write_mos_reg(serial, number, DLM, (__u8)((divisor & 0xff00) >> 8));
1574
1575 /* Disable access to divisor latch */
1576 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1577 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR);
1578
1579 return status;
1580 }
1581
1582 /*
1583 * change_port_settings
1584 * This routine is called to set the UART on the device to match
1585 * the specified new settings.
1586 */
1587 static void change_port_settings(struct tty_struct *tty,
1588 struct moschip_port *mos7720_port,
1589 struct ktermios *old_termios)
1590 {
1591 struct usb_serial_port *port;
1592 struct usb_serial *serial;
1593 int baud;
1594 unsigned cflag;
1595 unsigned iflag;
1596 __u8 mask = 0xff;
1597 __u8 lData;
1598 __u8 lParity;
1599 __u8 lStop;
1600 int status;
1601 int port_number;
1602
1603 if (mos7720_port == NULL)
1604 return ;
1605
1606 port = mos7720_port->port;
1607 serial = port->serial;
1608 port_number = port->number - port->serial->minor;
1609
1610 dbg("%s - port %d", __func__, port->number);
1611
1612 if (!mos7720_port->open) {
1613 dbg("%s - port not opened", __func__);
1614 return;
1615 }
1616
1617 dbg("%s: Entering ..........", __func__);
1618
1619 lData = UART_LCR_WLEN8;
1620 lStop = 0x00; /* 1 stop bit */
1621 lParity = 0x00; /* No parity */
1622
1623 cflag = tty->termios->c_cflag;
1624 iflag = tty->termios->c_iflag;
1625
1626 /* Change the number of bits */
1627 switch (cflag & CSIZE) {
1628 case CS5:
1629 lData = UART_LCR_WLEN5;
1630 mask = 0x1f;
1631 break;
1632
1633 case CS6:
1634 lData = UART_LCR_WLEN6;
1635 mask = 0x3f;
1636 break;
1637
1638 case CS7:
1639 lData = UART_LCR_WLEN7;
1640 mask = 0x7f;
1641 break;
1642 default:
1643 case CS8:
1644 lData = UART_LCR_WLEN8;
1645 break;
1646 }
1647
1648 /* Change the Parity bit */
1649 if (cflag & PARENB) {
1650 if (cflag & PARODD) {
1651 lParity = UART_LCR_PARITY;
1652 dbg("%s - parity = odd", __func__);
1653 } else {
1654 lParity = (UART_LCR_EPAR | UART_LCR_PARITY);
1655 dbg("%s - parity = even", __func__);
1656 }
1657
1658 } else {
1659 dbg("%s - parity = none", __func__);
1660 }
1661
1662 if (cflag & CMSPAR)
1663 lParity = lParity | 0x20;
1664
1665 /* Change the Stop bit */
1666 if (cflag & CSTOPB) {
1667 lStop = UART_LCR_STOP;
1668 dbg("%s - stop bits = 2", __func__);
1669 } else {
1670 lStop = 0x00;
1671 dbg("%s - stop bits = 1", __func__);
1672 }
1673
1674 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
1675 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
1676 #define LCR_PAR_MASK 0x38 /* Mask for parity field */
1677
1678 /* Update the LCR with the correct value */
1679 mos7720_port->shadowLCR &=
1680 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1681 mos7720_port->shadowLCR |= (lData | lParity | lStop);
1682
1683
1684 /* Disable Interrupts */
1685 write_mos_reg(serial, port_number, IER, 0x00);
1686 write_mos_reg(serial, port_number, FCR, 0x00);
1687 write_mos_reg(serial, port_number, FCR, 0xcf);
1688
1689 /* Send the updated LCR value to the mos7720 */
1690 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1691 mos7720_port->shadowMCR = 0x0b;
1692 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1693
1694 /* set up the MCR register and send it to the mos7720 */
1695 mos7720_port->shadowMCR = UART_MCR_OUT2;
1696 if (cflag & CBAUD)
1697 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS);
1698
1699 if (cflag & CRTSCTS) {
1700 mos7720_port->shadowMCR |= (UART_MCR_XONANY);
1701 /* To set hardware flow control to the specified *
1702 * serial port, in SP1/2_CONTROL_REG */
1703 if (port->number)
1704 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x01);
1705 else
1706 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x02);
1707
1708 } else
1709 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY);
1710
1711 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1712
1713 /* Determine divisor based on baud rate */
1714 baud = tty_get_baud_rate(tty);
1715 if (!baud) {
1716 /* pick a default, any default... */
1717 dbg("Picked default baud...");
1718 baud = 9600;
1719 }
1720
1721 if (baud >= 230400) {
1722 set_higher_rates(mos7720_port, baud);
1723 /* Enable Interrupts */
1724 write_mos_reg(serial, port_number, IER, 0x0c);
1725 return;
1726 }
1727
1728 dbg("%s - baud rate = %d", __func__, baud);
1729 status = send_cmd_write_baud_rate(mos7720_port, baud);
1730 /* FIXME: needs to write actual resulting baud back not just
1731 blindly do so */
1732 if (cflag & CBAUD)
1733 tty_encode_baud_rate(tty, baud, baud);
1734 /* Enable Interrupts */
1735 write_mos_reg(serial, port_number, IER, 0x0c);
1736
1737 if (port->read_urb->status != -EINPROGRESS) {
1738 port->read_urb->dev = serial->dev;
1739
1740 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1741 if (status)
1742 dbg("usb_submit_urb(read bulk) failed, status = %d",
1743 status);
1744 }
1745 }
1746
1747 /*
1748 * mos7720_set_termios
1749 * this function is called by the tty driver when it wants to change the
1750 * termios structure.
1751 */
1752 static void mos7720_set_termios(struct tty_struct *tty,
1753 struct usb_serial_port *port, struct ktermios *old_termios)
1754 {
1755 int status;
1756 unsigned int cflag;
1757 struct usb_serial *serial;
1758 struct moschip_port *mos7720_port;
1759
1760 serial = port->serial;
1761
1762 mos7720_port = usb_get_serial_port_data(port);
1763
1764 if (mos7720_port == NULL)
1765 return;
1766
1767 if (!mos7720_port->open) {
1768 dbg("%s - port not opened", __func__);
1769 return;
1770 }
1771
1772 dbg("%s\n", "setting termios - ASPIRE");
1773
1774 cflag = tty->termios->c_cflag;
1775
1776 dbg("%s - cflag %08x iflag %08x", __func__,
1777 tty->termios->c_cflag,
1778 RELEVANT_IFLAG(tty->termios->c_iflag));
1779
1780 dbg("%s - old cflag %08x old iflag %08x", __func__,
1781 old_termios->c_cflag,
1782 RELEVANT_IFLAG(old_termios->c_iflag));
1783
1784 dbg("%s - port %d", __func__, port->number);
1785
1786 /* change the port settings to the new ones specified */
1787 change_port_settings(tty, mos7720_port, old_termios);
1788
1789 if (!port->read_urb) {
1790 dbg("%s", "URB KILLED !!!!!");
1791 return;
1792 }
1793
1794 if (port->read_urb->status != -EINPROGRESS) {
1795 port->read_urb->dev = serial->dev;
1796 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1797 if (status)
1798 dbg("usb_submit_urb(read bulk) failed, status = %d",
1799 status);
1800 }
1801 }
1802
1803 /*
1804 * get_lsr_info - get line status register info
1805 *
1806 * Purpose: Let user call ioctl() to get info when the UART physically
1807 * is emptied. On bus types like RS485, the transmitter must
1808 * release the bus after transmitting. This must be done when
1809 * the transmit shift register is empty, not be done when the
1810 * transmit holding register is empty. This functionality
1811 * allows an RS485 driver to be written in user space.
1812 */
1813 static int get_lsr_info(struct tty_struct *tty,
1814 struct moschip_port *mos7720_port, unsigned int __user *value)
1815 {
1816 struct usb_serial_port *port = tty->driver_data;
1817 unsigned int result = 0;
1818 unsigned char data = 0;
1819 int port_number = port->number - port->serial->minor;
1820 int count;
1821
1822 count = mos7720_chars_in_buffer(tty);
1823 if (count == 0) {
1824 read_mos_reg(port->serial, port_number, LSR, &data);
1825 if ((data & (UART_LSR_TEMT | UART_LSR_THRE))
1826 == (UART_LSR_TEMT | UART_LSR_THRE)) {
1827 dbg("%s -- Empty", __func__);
1828 result = TIOCSER_TEMT;
1829 }
1830 }
1831 if (copy_to_user(value, &result, sizeof(int)))
1832 return -EFAULT;
1833 return 0;
1834 }
1835
1836 static int mos7720_tiocmget(struct tty_struct *tty)
1837 {
1838 struct usb_serial_port *port = tty->driver_data;
1839 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1840 unsigned int result = 0;
1841 unsigned int mcr ;
1842 unsigned int msr ;
1843
1844 dbg("%s - port %d", __func__, port->number);
1845
1846 mcr = mos7720_port->shadowMCR;
1847 msr = mos7720_port->shadowMSR;
1848
1849 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */
1850 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */
1851 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */
1852 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */
1853 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */
1854 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
1855
1856 dbg("%s -- %x", __func__, result);
1857
1858 return result;
1859 }
1860
1861 static int mos7720_tiocmset(struct tty_struct *tty,
1862 unsigned int set, unsigned int clear)
1863 {
1864 struct usb_serial_port *port = tty->driver_data;
1865 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1866 unsigned int mcr ;
1867 dbg("%s - port %d", __func__, port->number);
1868 dbg("he was at tiocmset");
1869
1870 mcr = mos7720_port->shadowMCR;
1871
1872 if (set & TIOCM_RTS)
1873 mcr |= UART_MCR_RTS;
1874 if (set & TIOCM_DTR)
1875 mcr |= UART_MCR_DTR;
1876 if (set & TIOCM_LOOP)
1877 mcr |= UART_MCR_LOOP;
1878
1879 if (clear & TIOCM_RTS)
1880 mcr &= ~UART_MCR_RTS;
1881 if (clear & TIOCM_DTR)
1882 mcr &= ~UART_MCR_DTR;
1883 if (clear & TIOCM_LOOP)
1884 mcr &= ~UART_MCR_LOOP;
1885
1886 mos7720_port->shadowMCR = mcr;
1887 write_mos_reg(port->serial, port->number - port->serial->minor,
1888 MCR, mos7720_port->shadowMCR);
1889
1890 return 0;
1891 }
1892
1893 static int mos7720_get_icount(struct tty_struct *tty,
1894 struct serial_icounter_struct *icount)
1895 {
1896 struct usb_serial_port *port = tty->driver_data;
1897 struct moschip_port *mos7720_port;
1898 struct async_icount cnow;
1899
1900 mos7720_port = usb_get_serial_port_data(port);
1901 cnow = mos7720_port->icount;
1902
1903 icount->cts = cnow.cts;
1904 icount->dsr = cnow.dsr;
1905 icount->rng = cnow.rng;
1906 icount->dcd = cnow.dcd;
1907 icount->rx = cnow.rx;
1908 icount->tx = cnow.tx;
1909 icount->frame = cnow.frame;
1910 icount->overrun = cnow.overrun;
1911 icount->parity = cnow.parity;
1912 icount->brk = cnow.brk;
1913 icount->buf_overrun = cnow.buf_overrun;
1914
1915 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
1916 port->number, icount->rx, icount->tx);
1917 return 0;
1918 }
1919
1920 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd,
1921 unsigned int __user *value)
1922 {
1923 unsigned int mcr;
1924 unsigned int arg;
1925
1926 struct usb_serial_port *port;
1927
1928 if (mos7720_port == NULL)
1929 return -1;
1930
1931 port = (struct usb_serial_port *)mos7720_port->port;
1932 mcr = mos7720_port->shadowMCR;
1933
1934 if (copy_from_user(&arg, value, sizeof(int)))
1935 return -EFAULT;
1936
1937 switch (cmd) {
1938 case TIOCMBIS:
1939 if (arg & TIOCM_RTS)
1940 mcr |= UART_MCR_RTS;
1941 if (arg & TIOCM_DTR)
1942 mcr |= UART_MCR_RTS;
1943 if (arg & TIOCM_LOOP)
1944 mcr |= UART_MCR_LOOP;
1945 break;
1946
1947 case TIOCMBIC:
1948 if (arg & TIOCM_RTS)
1949 mcr &= ~UART_MCR_RTS;
1950 if (arg & TIOCM_DTR)
1951 mcr &= ~UART_MCR_RTS;
1952 if (arg & TIOCM_LOOP)
1953 mcr &= ~UART_MCR_LOOP;
1954 break;
1955
1956 }
1957
1958 mos7720_port->shadowMCR = mcr;
1959 write_mos_reg(port->serial, port->number - port->serial->minor,
1960 MCR, mos7720_port->shadowMCR);
1961
1962 return 0;
1963 }
1964
1965 static int get_serial_info(struct moschip_port *mos7720_port,
1966 struct serial_struct __user *retinfo)
1967 {
1968 struct serial_struct tmp;
1969
1970 if (!retinfo)
1971 return -EFAULT;
1972
1973 memset(&tmp, 0, sizeof(tmp));
1974
1975 tmp.type = PORT_16550A;
1976 tmp.line = mos7720_port->port->serial->minor;
1977 tmp.port = mos7720_port->port->number;
1978 tmp.irq = 0;
1979 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
1980 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1981 tmp.baud_base = 9600;
1982 tmp.close_delay = 5*HZ;
1983 tmp.closing_wait = 30*HZ;
1984
1985 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1986 return -EFAULT;
1987 return 0;
1988 }
1989
1990 static int mos7720_ioctl(struct tty_struct *tty,
1991 unsigned int cmd, unsigned long arg)
1992 {
1993 struct usb_serial_port *port = tty->driver_data;
1994 struct moschip_port *mos7720_port;
1995 struct async_icount cnow;
1996 struct async_icount cprev;
1997
1998 mos7720_port = usb_get_serial_port_data(port);
1999 if (mos7720_port == NULL)
2000 return -ENODEV;
2001
2002 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2003
2004 switch (cmd) {
2005 case TIOCSERGETLSR:
2006 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2007 return get_lsr_info(tty, mos7720_port,
2008 (unsigned int __user *)arg);
2009 return 0;
2010
2011 /* FIXME: These should be using the mode methods */
2012 case TIOCMBIS:
2013 case TIOCMBIC:
2014 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET",
2015 __func__, port->number);
2016 return set_modem_info(mos7720_port, cmd,
2017 (unsigned int __user *)arg);
2018
2019 case TIOCGSERIAL:
2020 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2021 return get_serial_info(mos7720_port,
2022 (struct serial_struct __user *)arg);
2023
2024 case TIOCMIWAIT:
2025 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2026 cprev = mos7720_port->icount;
2027 while (1) {
2028 if (signal_pending(current))
2029 return -ERESTARTSYS;
2030 cnow = mos7720_port->icount;
2031 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2032 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2033 return -EIO; /* no change => error */
2034 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2035 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2036 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2037 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2038 return 0;
2039 }
2040 cprev = cnow;
2041 }
2042 /* NOTREACHED */
2043 break;
2044 }
2045
2046 return -ENOIOCTLCMD;
2047 }
2048
2049 static int mos7720_startup(struct usb_serial *serial)
2050 {
2051 struct moschip_port *mos7720_port;
2052 struct usb_device *dev;
2053 int i;
2054 char data;
2055 u16 product;
2056 int ret_val;
2057
2058 dbg("%s: Entering ..........", __func__);
2059
2060 if (!serial) {
2061 dbg("Invalid Handler");
2062 return -ENODEV;
2063 }
2064
2065 product = le16_to_cpu(serial->dev->descriptor.idProduct);
2066 dev = serial->dev;
2067
2068 /*
2069 * The 7715 uses the first bulk in/out endpoint pair for the parallel
2070 * port, and the second for the serial port. Because the usbserial core
2071 * assumes both pairs are serial ports, we must engage in a bit of
2072 * subterfuge and swap the pointers for ports 0 and 1 in order to make
2073 * port 0 point to the serial port. However, both moschip devices use a
2074 * single interrupt-in endpoint for both ports (as mentioned a little
2075 * further down), and this endpoint was assigned to port 0. So after
2076 * the swap, we must copy the interrupt endpoint elements from port 1
2077 * (as newly assigned) to port 0, and null out port 1 pointers.
2078 */
2079 if (product == MOSCHIP_DEVICE_ID_7715) {
2080 struct usb_serial_port *tmp = serial->port[0];
2081 serial->port[0] = serial->port[1];
2082 serial->port[1] = tmp;
2083 serial->port[0]->interrupt_in_urb = tmp->interrupt_in_urb;
2084 serial->port[0]->interrupt_in_buffer = tmp->interrupt_in_buffer;
2085 serial->port[0]->interrupt_in_endpointAddress =
2086 tmp->interrupt_in_endpointAddress;
2087 serial->port[1]->interrupt_in_urb = NULL;
2088 serial->port[1]->interrupt_in_buffer = NULL;
2089 }
2090
2091
2092 /* set up serial port private structures */
2093 for (i = 0; i < serial->num_ports; ++i) {
2094 mos7720_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2095 if (mos7720_port == NULL) {
2096 dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2097 return -ENOMEM;
2098 }
2099
2100 /* Initialize all port interrupt end point to port 0 int
2101 * endpoint. Our device has only one interrupt endpoint
2102 * common to all ports */
2103 serial->port[i]->interrupt_in_endpointAddress =
2104 serial->port[0]->interrupt_in_endpointAddress;
2105
2106 mos7720_port->port = serial->port[i];
2107 usb_set_serial_port_data(serial->port[i], mos7720_port);
2108
2109 dbg("port number is %d", serial->port[i]->number);
2110 dbg("serial number is %d", serial->minor);
2111 }
2112
2113
2114 /* setting configuration feature to one */
2115 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2116 (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5*HZ);
2117
2118 /* start the interrupt urb */
2119 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL);
2120 if (ret_val)
2121 dev_err(&dev->dev,
2122 "%s - Error %d submitting control urb\n",
2123 __func__, ret_val);
2124
2125 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
2126 if (product == MOSCHIP_DEVICE_ID_7715) {
2127 ret_val = mos7715_parport_init(serial);
2128 if (ret_val < 0)
2129 return ret_val;
2130 }
2131 #endif
2132 /* LSR For Port 1 */
2133 read_mos_reg(serial, 0, LSR, &data);
2134 dbg("LSR:%x", data);
2135
2136 return 0;
2137 }
2138
2139 static void mos7720_release(struct usb_serial *serial)
2140 {
2141 int i;
2142
2143 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
2144 /* close the parallel port */
2145
2146 if (le16_to_cpu(serial->dev->descriptor.idProduct)
2147 == MOSCHIP_DEVICE_ID_7715) {
2148 struct urbtracker *urbtrack;
2149 unsigned long flags;
2150 struct mos7715_parport *mos_parport =
2151 usb_get_serial_data(serial);
2152
2153 /* prevent NULL ptr dereference in port callbacks */
2154 spin_lock(&release_lock);
2155 mos_parport->pp->private_data = NULL;
2156 spin_unlock(&release_lock);
2157
2158 /* wait for synchronous usb calls to return */
2159 if (mos_parport->msg_pending)
2160 wait_for_completion_timeout(&mos_parport->syncmsg_compl,
2161 MOS_WDR_TIMEOUT);
2162
2163 parport_remove_port(mos_parport->pp);
2164 usb_set_serial_data(serial, NULL);
2165 mos_parport->serial = NULL;
2166
2167 /* if tasklet currently scheduled, wait for it to complete */
2168 tasklet_kill(&mos_parport->urb_tasklet);
2169
2170 /* unlink any urbs sent by the tasklet */
2171 spin_lock_irqsave(&mos_parport->listlock, flags);
2172 list_for_each_entry(urbtrack,
2173 &mos_parport->active_urbs,
2174 urblist_entry)
2175 usb_unlink_urb(urbtrack->urb);
2176 spin_unlock_irqrestore(&mos_parport->listlock, flags);
2177
2178 kref_put(&mos_parport->ref_count, destroy_mos_parport);
2179 }
2180 #endif
2181 /* free private structure allocated for serial port */
2182 for (i = 0; i < serial->num_ports; ++i)
2183 kfree(usb_get_serial_port_data(serial->port[i]));
2184 }
2185
2186 static struct usb_driver usb_driver = {
2187 .name = "moschip7720",
2188 .probe = usb_serial_probe,
2189 .disconnect = usb_serial_disconnect,
2190 .id_table = moschip_port_id_table,
2191 .no_dynamic_id = 1,
2192 };
2193
2194 static struct usb_serial_driver moschip7720_2port_driver = {
2195 .driver = {
2196 .owner = THIS_MODULE,
2197 .name = "moschip7720",
2198 },
2199 .description = "Moschip 2 port adapter",
2200 .usb_driver = &usb_driver,
2201 .id_table = moschip_port_id_table,
2202 .calc_num_ports = mos77xx_calc_num_ports,
2203 .open = mos7720_open,
2204 .close = mos7720_close,
2205 .throttle = mos7720_throttle,
2206 .unthrottle = mos7720_unthrottle,
2207 .probe = mos77xx_probe,
2208 .attach = mos7720_startup,
2209 .release = mos7720_release,
2210 .ioctl = mos7720_ioctl,
2211 .tiocmget = mos7720_tiocmget,
2212 .tiocmset = mos7720_tiocmset,
2213 .get_icount = mos7720_get_icount,
2214 .set_termios = mos7720_set_termios,
2215 .write = mos7720_write,
2216 .write_room = mos7720_write_room,
2217 .chars_in_buffer = mos7720_chars_in_buffer,
2218 .break_ctl = mos7720_break,
2219 .read_bulk_callback = mos7720_bulk_in_callback,
2220 .read_int_callback = NULL /* dynamically assigned in probe() */
2221 };
2222
2223 static int __init moschip7720_init(void)
2224 {
2225 int retval;
2226
2227 dbg("%s: Entering ..........", __func__);
2228
2229 /* Register with the usb serial */
2230 retval = usb_serial_register(&moschip7720_2port_driver);
2231 if (retval)
2232 goto failed_port_device_register;
2233
2234 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2235 DRIVER_DESC "\n");
2236
2237 /* Register with the usb */
2238 retval = usb_register(&usb_driver);
2239 if (retval)
2240 goto failed_usb_register;
2241
2242 return 0;
2243
2244 failed_usb_register:
2245 usb_serial_deregister(&moschip7720_2port_driver);
2246
2247 failed_port_device_register:
2248 return retval;
2249 }
2250
2251 static void __exit moschip7720_exit(void)
2252 {
2253 usb_deregister(&usb_driver);
2254 usb_serial_deregister(&moschip7720_2port_driver);
2255 }
2256
2257 module_init(moschip7720_init);
2258 module_exit(moschip7720_exit);
2259
2260 /* Module information */
2261 MODULE_AUTHOR(DRIVER_AUTHOR);
2262 MODULE_DESCRIPTION(DRIVER_DESC);
2263 MODULE_LICENSE("GPL");
2264
2265 module_param(debug, bool, S_IRUGO | S_IWUSR);
2266 MODULE_PARM_DESC(debug, "Debug enabled or not");
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