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USB: usbserial: mos7720: add support for parallel port on moschip 7715
[deliverable/linux.git] / drivers / usb / serial / mos7720.c
1 /*
2 * mos7720.c
3 * Controls the Moschip 7720 usb to dual port serial convertor
4 *
5 * Copyright 2006 Moschip Semiconductor Tech. Ltd.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, version 2 of the License.
10 *
11 * Developed by:
12 * Vijaya Kumar <vijaykumar.gn@gmail.com>
13 * Ajay Kumar <naanuajay@yahoo.com>
14 * Gurudeva <ngurudeva@yahoo.com>
15 *
16 * Cleaned up from the original by:
17 * Greg Kroah-Hartman <gregkh@suse.de>
18 *
19 * Originally based on drivers/usb/serial/io_edgeport.c which is:
20 * Copyright (C) 2000 Inside Out Networks, All rights reserved.
21 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
22 */
23 #include <linux/kernel.h>
24 #include <linux/errno.h>
25 #include <linux/init.h>
26 #include <linux/slab.h>
27 #include <linux/tty.h>
28 #include <linux/tty_driver.h>
29 #include <linux/tty_flip.h>
30 #include <linux/module.h>
31 #include <linux/spinlock.h>
32 #include <linux/serial.h>
33 #include <linux/serial_reg.h>
34 #include <linux/usb.h>
35 #include <linux/usb/serial.h>
36 #include <linux/uaccess.h>
37 #include <linux/parport.h>
38
39 /*
40 * Version Information
41 */
42 #define DRIVER_VERSION "2.0"
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_PORT1 0x0200
50 #define MOS_PORT2 0x0300
51 #define MOS_VENREG 0x0000
52 #define MOS_MAX_PORT 0x02
53 #define MOS_WRITE 0x0E
54 #define MOS_READ 0x0D
55
56 /* Interrupt Rotinue Defines */
57 #define SERIAL_IIR_RLS 0x06
58 #define SERIAL_IIR_RDA 0x04
59 #define SERIAL_IIR_CTI 0x0c
60 #define SERIAL_IIR_THR 0x02
61 #define SERIAL_IIR_MS 0x00
62
63 #define NUM_URBS 16 /* URB Count */
64 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
65
66 /* This structure holds all of the local serial port information */
67 struct moschip_port {
68 __u8 shadowLCR; /* last LCR value received */
69 __u8 shadowMCR; /* last MCR value received */
70 __u8 shadowMSR; /* last MSR value received */
71 char open;
72 struct async_icount icount;
73 struct usb_serial_port *port; /* loop back to the owner */
74 struct urb *write_urb_pool[NUM_URBS];
75 };
76
77 static int debug;
78
79 static struct usb_serial_driver moschip7720_2port_driver;
80
81 #define USB_VENDOR_ID_MOSCHIP 0x9710
82 #define MOSCHIP_DEVICE_ID_7720 0x7720
83 #define MOSCHIP_DEVICE_ID_7715 0x7715
84
85 static const struct usb_device_id moschip_port_id_table[] = {
86 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7720) },
87 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7715) },
88 { } /* terminating entry */
89 };
90 MODULE_DEVICE_TABLE(usb, moschip_port_id_table);
91
92 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
93
94 /* initial values for parport regs */
95 #define DCR_INIT_VAL 0x0c /* SLCTIN, nINIT */
96 #define ECR_INIT_VAL 0x00 /* SPP mode */
97
98 struct urbtracker {
99 struct mos7715_parport *mos_parport;
100 struct list_head urblist_entry;
101 struct kref ref_count;
102 struct urb *urb;
103 };
104
105 enum mos7715_pp_modes {
106 SPP = 0<<5,
107 PS2 = 1<<5, /* moschip calls this 'NIBBLE' mode */
108 PPF = 2<<5, /* moschip calls this 'CB-FIFO mode */
109 };
110
111 struct mos7715_parport {
112 struct parport *pp; /* back to containing struct */
113 struct kref ref_count; /* to instance of this struct */
114 struct list_head deferred_urbs; /* list deferred async urbs */
115 struct list_head active_urbs; /* list async urbs in flight */
116 spinlock_t listlock; /* protects list access */
117 bool msg_pending; /* usb sync call pending */
118 struct completion syncmsg_compl; /* usb sync call completed */
119 struct tasklet_struct urb_tasklet; /* for sending deferred urbs */
120 struct usb_serial *serial; /* back to containing struct */
121 __u8 shadowECR; /* parallel port regs... */
122 __u8 shadowDCR;
123 atomic_t shadowDSR; /* updated in int-in callback */
124 };
125
126 /* lock guards against dereferencing NULL ptr in parport ops callbacks */
127 static DEFINE_SPINLOCK(release_lock);
128
129 enum mos_regs {
130 THR, /* serial port regs */
131 RHR,
132 IER,
133 FCR,
134 ISR,
135 LCR,
136 MCR,
137 LSR,
138 MSR,
139 SPR,
140 DLL,
141 DLM,
142 DPR, /* parallel port regs */
143 DSR,
144 DCR,
145 ECR,
146 SP1_REG, /* device control regs */
147 SP2_REG, /* serial port 2 (7720 only) */
148 PP_REG,
149 SP_CONTROL_REG,
150 };
151
152 /*
153 * Return the correct value for the Windex field of the setup packet
154 * for a control endpoint message. See the 7715 datasheet.
155 */
156 static inline __u16 get_reg_index(enum mos_regs reg)
157 {
158 static const __u16 mos7715_index_lookup_table[] = {
159 0x00, /* THR */
160 0x00, /* RHR */
161 0x01, /* IER */
162 0x02, /* FCR */
163 0x02, /* ISR */
164 0x03, /* LCR */
165 0x04, /* MCR */
166 0x05, /* LSR */
167 0x06, /* MSR */
168 0x07, /* SPR */
169 0x00, /* DLL */
170 0x01, /* DLM */
171 0x00, /* DPR */
172 0x01, /* DSR */
173 0x02, /* DCR */
174 0x0a, /* ECR */
175 0x01, /* SP1_REG */
176 0x02, /* SP2_REG (7720 only) */
177 0x04, /* PP_REG (7715 only) */
178 0x08, /* SP_CONTROL_REG */
179 };
180 return mos7715_index_lookup_table[reg];
181 }
182
183 /*
184 * Return the correct value for the upper byte of the Wvalue field of
185 * the setup packet for a control endpoint message.
186 */
187 static inline __u16 get_reg_value(enum mos_regs reg)
188 {
189 if (reg >= SP1_REG) /* control reg */
190 return 0x0000;
191 else /* parallel port reg (7715 only) */
192 return 0x0100;
193 }
194
195 /*
196 * Write data byte to the specified device register. The data is embedded in
197 * the value field of the setup packet.
198 */
199 static int write_parport_reg(struct mos7715_parport *mos_parport,
200 enum mos_regs reg, __u8 data)
201 {
202 struct usb_serial *serial = mos_parport->serial;
203 struct usb_device *usbdev = serial->dev;
204 unsigned int pipe = usb_sndctrlpipe(usbdev, 0);
205 __u8 request = (__u8)0x0e;
206 __u8 requesttype = (__u8)0x40;
207 __u16 value = get_reg_value(reg) + data;
208 __u16 index = get_reg_index(reg);
209 __u16 size = 0;
210 int status;
211 status = usb_control_msg(usbdev, pipe, request, requesttype, value,
212 index, NULL, size, MOS_WDR_TIMEOUT);
213 if (status < 0)
214 dev_err(&usbdev->dev,
215 "mos7720: usb_control_msg() failed: %d", status);
216 return status;
217 }
218
219 /*
220 * Read data byte from the specified device register. The data returned by the
221 * device is embedded in the value field of the setup packet.
222 */
223 static int read_parport_reg(struct mos7715_parport *mos_parport,
224 enum mos_regs reg, __u8 *data)
225 {
226 struct usb_device *usbdev = mos_parport->serial->dev;
227 unsigned int pipe = usb_rcvctrlpipe(usbdev, 0);
228 __u8 request = (__u8)0x0d;
229 __u8 requesttype = (__u8)0xc0;
230 __u16 value = get_reg_value(reg);
231 __u16 index = get_reg_index(reg);
232 __u16 size = 1;
233 int status = usb_control_msg(usbdev, pipe, request, requesttype, value,
234 index, data, size, MOS_WDR_TIMEOUT);
235 if (status < 0)
236 dev_err(&usbdev->dev,
237 "mos7720: usb_control_msg() failed: %d", status);
238 return status;
239 }
240
241 static inline int mos7715_change_mode(struct mos7715_parport *mos_parport,
242 enum mos7715_pp_modes mode)
243 {
244 mos_parport->shadowECR = mode;
245 write_parport_reg(mos_parport, ECR, mos_parport->shadowECR);
246 return 0;
247 }
248
249 static void destroy_mos_parport(struct kref *kref)
250 {
251 struct mos7715_parport *mos_parport =
252 container_of(kref, struct mos7715_parport, ref_count);
253
254 dbg("%s called", __func__);
255 kfree(mos_parport);
256 }
257
258 static void destroy_urbtracker(struct kref *kref)
259 {
260 struct urbtracker *urbtrack =
261 container_of(kref, struct urbtracker, ref_count);
262 struct mos7715_parport *mos_parport = urbtrack->mos_parport;
263 dbg("%s called", __func__);
264 usb_free_urb(urbtrack->urb);
265 kfree(urbtrack);
266 kref_put(&mos_parport->ref_count, destroy_mos_parport);
267 }
268
269 /*
270 * This runs as a tasklet when sending an urb in a non-blocking parallel
271 * port callback had to be deferred because the disconnect mutex could not be
272 * obtained at the time.
273 */
274 static void send_deferred_urbs(unsigned long _mos_parport)
275 {
276 int ret_val;
277 unsigned long flags;
278 struct mos7715_parport *mos_parport = (void *)_mos_parport;
279 struct urbtracker *urbtrack;
280 struct list_head *cursor, *next;
281
282 dbg("%s called", __func__);
283
284 /* if release function ran, game over */
285 if (unlikely(mos_parport->serial == NULL))
286 return;
287
288 /* try again to get the mutex */
289 if (!mutex_trylock(&mos_parport->serial->disc_mutex)) {
290 dbg("%s: rescheduling tasklet", __func__);
291 tasklet_schedule(&mos_parport->urb_tasklet);
292 return;
293 }
294
295 /* if device disconnected, game over */
296 if (unlikely(mos_parport->serial->disconnected)) {
297 mutex_unlock(&mos_parport->serial->disc_mutex);
298 return;
299 }
300
301 spin_lock_irqsave(&mos_parport->listlock, flags);
302 if (list_empty(&mos_parport->deferred_urbs)) {
303 spin_unlock_irqrestore(&mos_parport->listlock, flags);
304 mutex_unlock(&mos_parport->serial->disc_mutex);
305 dbg("%s: deferred_urbs list empty", __func__);
306 return;
307 }
308
309 /* move contents of deferred_urbs list to active_urbs list and submit */
310 list_for_each_safe(cursor, next, &mos_parport->deferred_urbs)
311 list_move_tail(cursor, &mos_parport->active_urbs);
312 list_for_each_entry(urbtrack, &mos_parport->active_urbs,
313 urblist_entry) {
314 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
315 dbg("%s: urb submitted", __func__);
316 if (ret_val) {
317 dev_err(&mos_parport->serial->dev->dev,
318 "usb_submit_urb() failed: %d", ret_val);
319 list_del(&urbtrack->urblist_entry);
320 kref_put(&urbtrack->ref_count, destroy_urbtracker);
321 }
322 }
323 spin_unlock_irqrestore(&mos_parport->listlock, flags);
324 mutex_unlock(&mos_parport->serial->disc_mutex);
325 }
326
327 /* callback for parallel port control urbs submitted asynchronously */
328 static void async_complete(struct urb *urb)
329 {
330 struct urbtracker *urbtrack = urb->context;
331 int status = urb->status;
332 dbg("%s called", __func__);
333 if (unlikely(status))
334 dbg("%s - nonzero urb status received: %d", __func__, status);
335
336 /* remove the urbtracker from the active_urbs list */
337 spin_lock(&urbtrack->mos_parport->listlock);
338 list_del(&urbtrack->urblist_entry);
339 spin_unlock(&urbtrack->mos_parport->listlock);
340 kref_put(&urbtrack->ref_count, destroy_urbtracker);
341 }
342
343 static int write_parport_reg_nonblock(struct mos7715_parport *mos_parport,
344 enum mos_regs reg, __u8 data)
345 {
346 struct urbtracker *urbtrack;
347 int ret_val;
348 unsigned long flags;
349 struct usb_ctrlrequest setup;
350 struct usb_serial *serial = mos_parport->serial;
351 struct usb_device *usbdev = serial->dev;
352 dbg("%s called", __func__);
353
354 /* create and initialize the control urb and containing urbtracker */
355 urbtrack = kmalloc(sizeof(struct urbtracker), GFP_ATOMIC);
356 if (urbtrack == NULL) {
357 dev_err(&usbdev->dev, "out of memory");
358 return -ENOMEM;
359 }
360 kref_get(&mos_parport->ref_count);
361 urbtrack->mos_parport = mos_parport;
362 urbtrack->urb = usb_alloc_urb(0, GFP_ATOMIC);
363 if (urbtrack->urb == NULL) {
364 dev_err(&usbdev->dev, "out of urbs");
365 kfree(urbtrack);
366 return -ENOMEM;
367 }
368 setup.bRequestType = (__u8)0x40;
369 setup.bRequest = (__u8)0x0e;
370 setup.wValue = get_reg_value(reg);
371 setup.wIndex = get_reg_index(reg);
372 setup.wLength = 0;
373 usb_fill_control_urb(urbtrack->urb, usbdev,
374 usb_sndctrlpipe(usbdev, 0),
375 (unsigned char *)&setup,
376 NULL, 0, async_complete, urbtrack);
377 kref_init(&urbtrack->ref_count);
378 INIT_LIST_HEAD(&urbtrack->urblist_entry);
379
380 /*
381 * get the disconnect mutex, or add tracker to the deferred_urbs list
382 * and schedule a tasklet to try again later
383 */
384 if (!mutex_trylock(&serial->disc_mutex)) {
385 spin_lock_irqsave(&mos_parport->listlock, flags);
386 list_add_tail(&urbtrack->urblist_entry,
387 &mos_parport->deferred_urbs);
388 spin_unlock_irqrestore(&mos_parport->listlock, flags);
389 tasklet_schedule(&mos_parport->urb_tasklet);
390 dbg("tasklet scheduled");
391 return 0;
392 }
393
394 /* bail if device disconnected */
395 if (serial->disconnected) {
396 kref_put(&urbtrack->ref_count, destroy_urbtracker);
397 mutex_unlock(&serial->disc_mutex);
398 return -ENODEV;
399 }
400
401 /* add the tracker to the active_urbs list and submit */
402 spin_lock_irqsave(&mos_parport->listlock, flags);
403 list_add_tail(&urbtrack->urblist_entry, &mos_parport->active_urbs);
404 spin_unlock_irqrestore(&mos_parport->listlock, flags);
405 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
406 mutex_unlock(&serial->disc_mutex);
407 if (ret_val) {
408 dev_err(&usbdev->dev,
409 "%s: submit_urb() failed: %d", __func__, ret_val);
410 spin_lock_irqsave(&mos_parport->listlock, flags);
411 list_del(&urbtrack->urblist_entry);
412 spin_unlock_irqrestore(&mos_parport->listlock, flags);
413 kref_put(&urbtrack->ref_count, destroy_urbtracker);
414 return ret_val;
415 }
416 return 0;
417 }
418
419 /*
420 * This is the the common top part of all parallel port callback operations that
421 * send synchronous messages to the device. This implements convoluted locking
422 * that avoids two scenarios: (1) a port operation is called after usbserial
423 * has called our release function, at which point struct mos7715_parport has
424 * been destroyed, and (2) the device has been disconnected, but usbserial has
425 * not called the release function yet because someone has a serial port open.
426 * The shared release_lock prevents the first, and the mutex and disconnected
427 * flag maintained by usbserial covers the second. We also use the msg_pending
428 * flag to ensure that all synchronous usb messgage calls have completed before
429 * our release function can return.
430 */
431 static int parport_prologue(struct parport *pp)
432 {
433 struct mos7715_parport *mos_parport;
434
435 spin_lock(&release_lock);
436 mos_parport = pp->private_data;
437 if (unlikely(mos_parport == NULL)) {
438 /* release fn called, port struct destroyed */
439 spin_unlock(&release_lock);
440 return -1;
441 }
442 mos_parport->msg_pending = true; /* synch usb call pending */
443 INIT_COMPLETION(mos_parport->syncmsg_compl);
444 spin_unlock(&release_lock);
445
446 mutex_lock(&mos_parport->serial->disc_mutex);
447 if (mos_parport->serial->disconnected) {
448 /* device disconnected */
449 mutex_unlock(&mos_parport->serial->disc_mutex);
450 mos_parport->msg_pending = false;
451 complete(&mos_parport->syncmsg_compl);
452 return -1;
453 }
454
455 return 0;
456 }
457
458 /*
459 * This is the the common bottom part of all parallel port functions that send
460 * synchronous messages to the device.
461 */
462 static inline void parport_epilogue(struct parport *pp)
463 {
464 struct mos7715_parport *mos_parport = pp->private_data;
465 mutex_unlock(&mos_parport->serial->disc_mutex);
466 mos_parport->msg_pending = false;
467 complete(&mos_parport->syncmsg_compl);
468 }
469
470 static void parport_mos7715_write_data(struct parport *pp, unsigned char d)
471 {
472 struct mos7715_parport *mos_parport = pp->private_data;
473 dbg("%s called: %2.2x", __func__, d);
474 if (parport_prologue(pp) < 0)
475 return;
476 mos7715_change_mode(mos_parport, SPP);
477 write_parport_reg(mos_parport, DPR, (__u8)d);
478 parport_epilogue(pp);
479 }
480
481 static unsigned char parport_mos7715_read_data(struct parport *pp)
482 {
483 struct mos7715_parport *mos_parport = pp->private_data;
484 unsigned char d;
485 dbg("%s called", __func__);
486 if (parport_prologue(pp) < 0)
487 return 0;
488 read_parport_reg(mos_parport, DPR, &d);
489 parport_epilogue(pp);
490 return d;
491 }
492
493 static void parport_mos7715_write_control(struct parport *pp, unsigned char d)
494 {
495 struct mos7715_parport *mos_parport = pp->private_data;
496 __u8 data;
497 dbg("%s called: %2.2x", __func__, d);
498 if (parport_prologue(pp) < 0)
499 return;
500 data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0);
501 write_parport_reg(mos_parport, DCR, data);
502 mos_parport->shadowDCR = data;
503 parport_epilogue(pp);
504 }
505
506 static unsigned char parport_mos7715_read_control(struct parport *pp)
507 {
508 struct mos7715_parport *mos_parport = pp->private_data;
509 __u8 dcr;
510 dbg("%s called", __func__);
511 spin_lock(&release_lock);
512 mos_parport = pp->private_data;
513 if (unlikely(mos_parport == NULL)) {
514 spin_unlock(&release_lock);
515 return 0;
516 }
517 dcr = mos_parport->shadowDCR & 0x0f;
518 spin_unlock(&release_lock);
519 return dcr;
520 }
521
522 static unsigned char parport_mos7715_frob_control(struct parport *pp,
523 unsigned char mask,
524 unsigned char val)
525 {
526 struct mos7715_parport *mos_parport = pp->private_data;
527 __u8 dcr;
528 dbg("%s called", __func__);
529 mask &= 0x0f;
530 val &= 0x0f;
531 if (parport_prologue(pp) < 0)
532 return 0;
533 mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val;
534 write_parport_reg(mos_parport, DCR, mos_parport->shadowDCR);
535 dcr = mos_parport->shadowDCR & 0x0f;
536 parport_epilogue(pp);
537 return dcr;
538 }
539
540 static unsigned char parport_mos7715_read_status(struct parport *pp)
541 {
542 unsigned char status;
543 struct mos7715_parport *mos_parport = pp->private_data;
544 dbg("%s called", __func__);
545 spin_lock(&release_lock);
546 mos_parport = pp->private_data;
547 if (unlikely(mos_parport == NULL)) { /* release called */
548 spin_unlock(&release_lock);
549 return 0;
550 }
551 status = atomic_read(&mos_parport->shadowDSR) & 0xf8;
552 spin_unlock(&release_lock);
553 return status;
554 }
555
556 static void parport_mos7715_enable_irq(struct parport *pp)
557 {
558 dbg("%s called", __func__);
559 }
560 static void parport_mos7715_disable_irq(struct parport *pp)
561 {
562 dbg("%s called", __func__);
563 }
564
565 static void parport_mos7715_data_forward(struct parport *pp)
566 {
567 struct mos7715_parport *mos_parport = pp->private_data;
568 dbg("%s called", __func__);
569 if (parport_prologue(pp) < 0)
570 return;
571 mos7715_change_mode(mos_parport, PS2);
572 mos_parport->shadowDCR &= ~0x20;
573 write_parport_reg(mos_parport, DCR, mos_parport->shadowDCR);
574 parport_epilogue(pp);
575 }
576
577 static void parport_mos7715_data_reverse(struct parport *pp)
578 {
579 struct mos7715_parport *mos_parport = pp->private_data;
580 dbg("%s called", __func__);
581 if (parport_prologue(pp) < 0)
582 return;
583 mos7715_change_mode(mos_parport, PS2);
584 mos_parport->shadowDCR |= 0x20;
585 write_parport_reg(mos_parport, DCR, mos_parport->shadowDCR);
586 parport_epilogue(pp);
587 }
588
589 static void parport_mos7715_init_state(struct pardevice *dev,
590 struct parport_state *s)
591 {
592 dbg("%s called", __func__);
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 dbg("%s called", __func__);
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 dbg("%s called", __func__);
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 dbg("%s called: %u chars", __func__, (unsigned int)len);
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_parport_reg(mos_parport, PP_REG, (__u8)0x80);
709 write_parport_reg(mos_parport, PP_REG, (__u8)0x00);
710
711 /* initialize device registers */
712 mos_parport->shadowDCR = DCR_INIT_VAL;
713 write_parport_reg(mos_parport, DCR, mos_parport->shadowDCR);
714 mos_parport->shadowECR = ECR_INIT_VAL;
715 write_parport_reg(mos_parport, 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 case -ENODEV:
758 /* this urb is terminated, clean up */
759 dbg("%s - urb shutting down with status: %d", __func__,
760 status);
761 return;
762 default:
763 dbg("%s - nonzero urb status received: %d", __func__,
764 status);
765 goto exit;
766 }
767
768 length = urb->actual_length;
769 data = urb->transfer_buffer;
770
771 /* Moschip get 4 bytes
772 * Byte 1 IIR Port 1 (port.number is 0)
773 * Byte 2 IIR Port 2 (port.number is 1)
774 * Byte 3 --------------
775 * Byte 4 FIFO status for both */
776
777 /* the above description is inverted
778 * oneukum 2007-03-14 */
779
780 if (unlikely(length != 4)) {
781 dbg("Wrong data !!!");
782 return;
783 }
784
785 sp1 = data[3];
786 sp2 = data[2];
787
788 if ((sp1 | sp2) & 0x01) {
789 /* No Interrupt Pending in both the ports */
790 dbg("No Interrupt !!!");
791 } else {
792 switch (sp1 & 0x0f) {
793 case SERIAL_IIR_RLS:
794 dbg("Serial Port 1: Receiver status error or address "
795 "bit detected in 9-bit mode\n");
796 break;
797 case SERIAL_IIR_CTI:
798 dbg("Serial Port 1: Receiver time out");
799 break;
800 case SERIAL_IIR_MS:
801 /* dbg("Serial Port 1: Modem status change"); */
802 break;
803 }
804
805 switch (sp2 & 0x0f) {
806 case SERIAL_IIR_RLS:
807 dbg("Serial Port 2: Receiver status error or address "
808 "bit detected in 9-bit mode");
809 break;
810 case SERIAL_IIR_CTI:
811 dbg("Serial Port 2: Receiver time out");
812 break;
813 case SERIAL_IIR_MS:
814 /* dbg("Serial Port 2: Modem status change"); */
815 break;
816 }
817 }
818
819 exit:
820 result = usb_submit_urb(urb, GFP_ATOMIC);
821 if (result)
822 dev_err(&urb->dev->dev,
823 "%s - Error %d submitting control urb\n",
824 __func__, result);
825 return;
826 }
827
828 /*
829 * mos7715_interrupt_callback
830 * this is the 7715's callback function for when we have received data on
831 * the interrupt endpoint.
832 */
833 static void mos7715_interrupt_callback(struct urb *urb)
834 {
835 int result;
836 int length;
837 int status = urb->status;
838 __u8 *data;
839 __u8 iir;
840
841 switch (status) {
842 case 0:
843 /* success */
844 break;
845 case -ECONNRESET:
846 case -ENOENT:
847 case -ESHUTDOWN:
848 case -ENODEV:
849 /* this urb is terminated, clean up */
850 dbg("%s - urb shutting down with status: %d", __func__,
851 status);
852 return;
853 default:
854 dbg("%s - nonzero urb status received: %d", __func__,
855 status);
856 goto exit;
857 }
858
859 length = urb->actual_length;
860 data = urb->transfer_buffer;
861
862 /* Structure of data from 7715 device:
863 * Byte 1: IIR serial Port
864 * Byte 2: unused
865 * Byte 2: DSR parallel port
866 * Byte 4: FIFO status for both */
867
868 if (unlikely(length != 4)) {
869 dbg("Wrong data !!!");
870 return;
871 }
872
873 iir = data[0];
874 if (!(iir & 0x01)) { /* serial port interrupt pending */
875 switch (iir & 0x0f) {
876 case SERIAL_IIR_RLS:
877 dbg("Serial Port: Receiver status error or address "
878 "bit detected in 9-bit mode\n");
879 break;
880 case SERIAL_IIR_CTI:
881 dbg("Serial Port: Receiver time out");
882 break;
883 case SERIAL_IIR_MS:
884 /* dbg("Serial Port: Modem status change"); */
885 break;
886 }
887 }
888
889 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
890 { /* update local copy of DSR reg */
891 struct usb_serial_port *port = urb->context;
892 struct mos7715_parport *mos_parport = port->serial->private;
893 if (unlikely(mos_parport == NULL))
894 return;
895 atomic_set(&mos_parport->shadowDSR, data[2]);
896 }
897 #endif
898
899 exit:
900 result = usb_submit_urb(urb, GFP_ATOMIC);
901 if (result)
902 dev_err(&urb->dev->dev,
903 "%s - Error %d submitting control urb\n",
904 __func__, result);
905 return;
906 }
907
908 /*
909 * mos7720_bulk_in_callback
910 * this is the callback function for when we have received data on the
911 * bulk in endpoint.
912 */
913 static void mos7720_bulk_in_callback(struct urb *urb)
914 {
915 int retval;
916 unsigned char *data ;
917 struct usb_serial_port *port;
918 struct tty_struct *tty;
919 int status = urb->status;
920
921 if (status) {
922 dbg("nonzero read bulk status received: %d", status);
923 return;
924 }
925
926 port = urb->context;
927
928 dbg("Entering...%s", __func__);
929
930 data = urb->transfer_buffer;
931
932 tty = tty_port_tty_get(&port->port);
933 if (tty && urb->actual_length) {
934 tty_insert_flip_string(tty, data, urb->actual_length);
935 tty_flip_buffer_push(tty);
936 }
937 tty_kref_put(tty);
938
939 if (!port->read_urb) {
940 dbg("URB KILLED !!!");
941 return;
942 }
943
944 if (port->read_urb->status != -EINPROGRESS) {
945 port->read_urb->dev = port->serial->dev;
946
947 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
948 if (retval)
949 dbg("usb_submit_urb(read bulk) failed, retval = %d",
950 retval);
951 }
952 }
953
954 /*
955 * mos7720_bulk_out_data_callback
956 * this is the callback function for when we have finished sending serial
957 * data on the bulk out endpoint.
958 */
959 static void mos7720_bulk_out_data_callback(struct urb *urb)
960 {
961 struct moschip_port *mos7720_port;
962 struct tty_struct *tty;
963 int status = urb->status;
964
965 if (status) {
966 dbg("nonzero write bulk status received:%d", status);
967 return;
968 }
969
970 mos7720_port = urb->context;
971 if (!mos7720_port) {
972 dbg("NULL mos7720_port pointer");
973 return ;
974 }
975
976 tty = tty_port_tty_get(&mos7720_port->port->port);
977
978 if (tty && mos7720_port->open)
979 tty_wakeup(tty);
980 tty_kref_put(tty);
981 }
982
983 /*
984 * send_mos_cmd
985 * this function will be used for sending command to device
986 */
987 static int send_mos_cmd(struct usb_serial *serial, __u8 request, __u16 value,
988 __u16 index, u8 *data)
989 {
990 int status;
991 u8 *buf;
992 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
993
994 if (value < MOS_MAX_PORT) {
995 if (product == MOSCHIP_DEVICE_ID_7715)
996 value = 0x0200; /* identifies the 7715's serial port */
997 else
998 value = value*0x100+0x200;
999 } else {
1000 value = 0x0000;
1001 if ((product == MOSCHIP_DEVICE_ID_7715) &&
1002 (index != 0x08)) {
1003 dbg("serial->product== MOSCHIP_DEVICE_ID_7715");
1004 /* index = 0x01 ; */
1005 }
1006 }
1007
1008 if (request == MOS_WRITE) {
1009 value = value + *data;
1010 status = usb_control_msg(serial->dev,
1011 usb_sndctrlpipe(serial->dev, 0), MOS_WRITE,
1012 0x40, value, index, NULL, 0, MOS_WDR_TIMEOUT);
1013 } else {
1014 buf = kmalloc(1, GFP_KERNEL);
1015 if (!buf) {
1016 status = -ENOMEM;
1017 goto out;
1018 }
1019 status = usb_control_msg(serial->dev,
1020 usb_rcvctrlpipe(serial->dev, 0), MOS_READ,
1021 0xc0, value, index, buf, 1, MOS_WDR_TIMEOUT);
1022 *data = *buf;
1023 kfree(buf);
1024 }
1025 out:
1026 if (status < 0)
1027 dbg("Command Write failed Value %x index %x", value, index);
1028
1029 return status;
1030 }
1031
1032
1033 /*
1034 * mos77xx_probe
1035 * this function installs the appropriate read interrupt endpoint callback
1036 * depending on whether the device is a 7720 or 7715, thus avoiding costly
1037 * run-time checks in the high-frequency callback routine itself.
1038 */
1039 static int mos77xx_probe(struct usb_serial *serial,
1040 const struct usb_device_id *id)
1041 {
1042 if (id->idProduct == MOSCHIP_DEVICE_ID_7715)
1043 moschip7720_2port_driver.read_int_callback =
1044 mos7715_interrupt_callback;
1045 else
1046 moschip7720_2port_driver.read_int_callback =
1047 mos7720_interrupt_callback;
1048
1049 return 0;
1050 }
1051
1052 static int mos77xx_calc_num_ports(struct usb_serial *serial)
1053 {
1054 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
1055 if (product == MOSCHIP_DEVICE_ID_7715)
1056 return 1;
1057
1058 return 2;
1059 }
1060
1061 static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port)
1062 {
1063 struct usb_serial *serial;
1064 struct usb_serial_port *port0;
1065 struct urb *urb;
1066 struct moschip_port *mos7720_port;
1067 int response;
1068 int port_number;
1069 char data;
1070 int allocated_urbs = 0;
1071 int j;
1072
1073 serial = port->serial;
1074
1075 mos7720_port = usb_get_serial_port_data(port);
1076 if (mos7720_port == NULL)
1077 return -ENODEV;
1078
1079 port0 = serial->port[0];
1080
1081 usb_clear_halt(serial->dev, port->write_urb->pipe);
1082 usb_clear_halt(serial->dev, port->read_urb->pipe);
1083
1084 /* Initialising the write urb pool */
1085 for (j = 0; j < NUM_URBS; ++j) {
1086 urb = usb_alloc_urb(0, GFP_KERNEL);
1087 mos7720_port->write_urb_pool[j] = urb;
1088
1089 if (urb == NULL) {
1090 dev_err(&port->dev, "No more urbs???\n");
1091 continue;
1092 }
1093
1094 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1095 GFP_KERNEL);
1096 if (!urb->transfer_buffer) {
1097 dev_err(&port->dev,
1098 "%s-out of memory for urb buffers.\n",
1099 __func__);
1100 usb_free_urb(mos7720_port->write_urb_pool[j]);
1101 mos7720_port->write_urb_pool[j] = NULL;
1102 continue;
1103 }
1104 allocated_urbs++;
1105 }
1106
1107 if (!allocated_urbs)
1108 return -ENOMEM;
1109
1110 /* Initialize MCS7720 -- Write Init values to corresponding Registers
1111 *
1112 * Register Index
1113 * 0 : THR/RHR
1114 * 1 : IER
1115 * 2 : FCR
1116 * 3 : LCR
1117 * 4 : MCR
1118 * 5 : LSR
1119 * 6 : MSR
1120 * 7 : SPR
1121 *
1122 * 0x08 : SP1/2 Control Reg
1123 */
1124 port_number = port->number - port->serial->minor;
1125 send_mos_cmd(port->serial, MOS_READ, port_number, UART_LSR, &data);
1126 dbg("SS::%p LSR:%x", mos7720_port, data);
1127
1128 dbg("Check:Sending Command ..........");
1129
1130 data = 0x02;
1131 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x01, &data);
1132 data = 0x02;
1133 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x02, &data);
1134
1135 data = 0x00;
1136 send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
1137 data = 0x00;
1138 send_mos_cmd(serial, MOS_WRITE, port_number, 0x02, &data);
1139
1140 data = 0xCF;
1141 send_mos_cmd(serial, MOS_WRITE, port_number, 0x02, &data);
1142 data = 0x03;
1143 mos7720_port->shadowLCR = data;
1144 send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
1145 data = 0x0b;
1146 mos7720_port->shadowMCR = data;
1147 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
1148 data = 0x0b;
1149 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
1150
1151 data = 0x00;
1152 send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);
1153 data = 0x00;
1154 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &data);
1155
1156 /* data = 0x00;
1157 send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, port_number + 1, &data);
1158 data = 0x03;
1159 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, port_number + 1, &data);
1160 data = 0x00;
1161 send_mos_cmd(port->serial, MOS_WRITE, MOS_MAX_PORT,
1162 port_number + 1, &data);
1163 */
1164 data = 0x00;
1165 send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);
1166
1167 data = data | (port->number - port->serial->minor + 1);
1168 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &data);
1169
1170 data = 0x83;
1171 mos7720_port->shadowLCR = data;
1172 send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
1173 data = 0x0c;
1174 send_mos_cmd(serial, MOS_WRITE, port_number, 0x00, &data);
1175 data = 0x00;
1176 send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
1177 data = 0x03;
1178 mos7720_port->shadowLCR = data;
1179 send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
1180 data = 0x0c;
1181 send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
1182 data = 0x0c;
1183 send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
1184
1185 response = usb_submit_urb(port->read_urb, GFP_KERNEL);
1186 if (response)
1187 dev_err(&port->dev, "%s - Error %d submitting read urb\n",
1188 __func__, response);
1189
1190 /* initialize our icount structure */
1191 memset(&(mos7720_port->icount), 0x00, sizeof(mos7720_port->icount));
1192
1193 /* initialize our port settings */
1194 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */
1195
1196 /* send a open port command */
1197 mos7720_port->open = 1;
1198
1199 return 0;
1200 }
1201
1202 /*
1203 * mos7720_chars_in_buffer
1204 * this function is called by the tty driver when it wants to know how many
1205 * bytes of data we currently have outstanding in the port (data that has
1206 * been written, but hasn't made it out the port yet)
1207 * If successful, we return the number of bytes left to be written in the
1208 * system,
1209 * Otherwise we return a negative error number.
1210 */
1211 static int mos7720_chars_in_buffer(struct tty_struct *tty)
1212 {
1213 struct usb_serial_port *port = tty->driver_data;
1214 int i;
1215 int chars = 0;
1216 struct moschip_port *mos7720_port;
1217
1218 dbg("%s:entering ...........", __func__);
1219
1220 mos7720_port = usb_get_serial_port_data(port);
1221 if (mos7720_port == NULL) {
1222 dbg("%s:leaving ...........", __func__);
1223 return 0;
1224 }
1225
1226 for (i = 0; i < NUM_URBS; ++i) {
1227 if (mos7720_port->write_urb_pool[i] &&
1228 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS)
1229 chars += URB_TRANSFER_BUFFER_SIZE;
1230 }
1231 dbg("%s - returns %d", __func__, chars);
1232 return chars;
1233 }
1234
1235 static void mos7720_close(struct usb_serial_port *port)
1236 {
1237 struct usb_serial *serial;
1238 struct moschip_port *mos7720_port;
1239 char data;
1240 int j;
1241
1242 dbg("mos7720_close:entering...");
1243
1244 serial = port->serial;
1245
1246 mos7720_port = usb_get_serial_port_data(port);
1247 if (mos7720_port == NULL)
1248 return;
1249
1250 for (j = 0; j < NUM_URBS; ++j)
1251 usb_kill_urb(mos7720_port->write_urb_pool[j]);
1252
1253 /* Freeing Write URBs */
1254 for (j = 0; j < NUM_URBS; ++j) {
1255 if (mos7720_port->write_urb_pool[j]) {
1256 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer);
1257 usb_free_urb(mos7720_port->write_urb_pool[j]);
1258 }
1259 }
1260
1261 /* While closing port, shutdown all bulk read, write *
1262 * and interrupt read if they exists, otherwise nop */
1263 dbg("Shutdown bulk write");
1264 usb_kill_urb(port->write_urb);
1265 dbg("Shutdown bulk read");
1266 usb_kill_urb(port->read_urb);
1267
1268 mutex_lock(&serial->disc_mutex);
1269 /* these commands must not be issued if the device has
1270 * been disconnected */
1271 if (!serial->disconnected) {
1272 data = 0x00;
1273 send_mos_cmd(serial, MOS_WRITE,
1274 port->number - port->serial->minor, 0x04, &data);
1275
1276 data = 0x00;
1277 send_mos_cmd(serial, MOS_WRITE,
1278 port->number - port->serial->minor, 0x01, &data);
1279 }
1280 mutex_unlock(&serial->disc_mutex);
1281 mos7720_port->open = 0;
1282
1283 dbg("Leaving %s", __func__);
1284 }
1285
1286 static void mos7720_break(struct tty_struct *tty, int break_state)
1287 {
1288 struct usb_serial_port *port = tty->driver_data;
1289 unsigned char data;
1290 struct usb_serial *serial;
1291 struct moschip_port *mos7720_port;
1292
1293 dbg("Entering %s", __func__);
1294
1295 serial = port->serial;
1296
1297 mos7720_port = usb_get_serial_port_data(port);
1298 if (mos7720_port == NULL)
1299 return;
1300
1301 if (break_state == -1)
1302 data = mos7720_port->shadowLCR | UART_LCR_SBC;
1303 else
1304 data = mos7720_port->shadowLCR & ~UART_LCR_SBC;
1305
1306 mos7720_port->shadowLCR = data;
1307 send_mos_cmd(serial, MOS_WRITE, port->number - port->serial->minor,
1308 0x03, &data);
1309
1310 return;
1311 }
1312
1313 /*
1314 * mos7720_write_room
1315 * this function is called by the tty driver when it wants to know how many
1316 * bytes of data we can accept for a specific port.
1317 * If successful, we return the amount of room that we have for this port
1318 * Otherwise we return a negative error number.
1319 */
1320 static int mos7720_write_room(struct tty_struct *tty)
1321 {
1322 struct usb_serial_port *port = tty->driver_data;
1323 struct moschip_port *mos7720_port;
1324 int room = 0;
1325 int i;
1326
1327 dbg("%s:entering ...........", __func__);
1328
1329 mos7720_port = usb_get_serial_port_data(port);
1330 if (mos7720_port == NULL) {
1331 dbg("%s:leaving ...........", __func__);
1332 return -ENODEV;
1333 }
1334
1335 /* FIXME: Locking */
1336 for (i = 0; i < NUM_URBS; ++i) {
1337 if (mos7720_port->write_urb_pool[i] &&
1338 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS)
1339 room += URB_TRANSFER_BUFFER_SIZE;
1340 }
1341
1342 dbg("%s - returns %d", __func__, room);
1343 return room;
1344 }
1345
1346 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port,
1347 const unsigned char *data, int count)
1348 {
1349 int status;
1350 int i;
1351 int bytes_sent = 0;
1352 int transfer_size;
1353
1354 struct moschip_port *mos7720_port;
1355 struct usb_serial *serial;
1356 struct urb *urb;
1357 const unsigned char *current_position = data;
1358
1359 dbg("%s:entering ...........", __func__);
1360
1361 serial = port->serial;
1362
1363 mos7720_port = usb_get_serial_port_data(port);
1364 if (mos7720_port == NULL) {
1365 dbg("mos7720_port is NULL");
1366 return -ENODEV;
1367 }
1368
1369 /* try to find a free urb in the list */
1370 urb = NULL;
1371
1372 for (i = 0; i < NUM_URBS; ++i) {
1373 if (mos7720_port->write_urb_pool[i] &&
1374 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) {
1375 urb = mos7720_port->write_urb_pool[i];
1376 dbg("URB:%d", i);
1377 break;
1378 }
1379 }
1380
1381 if (urb == NULL) {
1382 dbg("%s - no more free urbs", __func__);
1383 goto exit;
1384 }
1385
1386 if (urb->transfer_buffer == NULL) {
1387 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1388 GFP_KERNEL);
1389 if (urb->transfer_buffer == NULL) {
1390 dev_err(&port->dev, "%s no more kernel memory...\n",
1391 __func__);
1392 goto exit;
1393 }
1394 }
1395 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1396
1397 memcpy(urb->transfer_buffer, current_position, transfer_size);
1398 usb_serial_debug_data(debug, &port->dev, __func__, transfer_size,
1399 urb->transfer_buffer);
1400
1401 /* fill urb with data and submit */
1402 usb_fill_bulk_urb(urb, serial->dev,
1403 usb_sndbulkpipe(serial->dev,
1404 port->bulk_out_endpointAddress),
1405 urb->transfer_buffer, transfer_size,
1406 mos7720_bulk_out_data_callback, mos7720_port);
1407
1408 /* send it down the pipe */
1409 status = usb_submit_urb(urb, GFP_ATOMIC);
1410 if (status) {
1411 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1412 "with status = %d\n", __func__, status);
1413 bytes_sent = status;
1414 goto exit;
1415 }
1416 bytes_sent = transfer_size;
1417
1418 exit:
1419 return bytes_sent;
1420 }
1421
1422 static void mos7720_throttle(struct tty_struct *tty)
1423 {
1424 struct usb_serial_port *port = tty->driver_data;
1425 struct moschip_port *mos7720_port;
1426 int status;
1427
1428 dbg("%s- port %d", __func__, port->number);
1429
1430 mos7720_port = usb_get_serial_port_data(port);
1431
1432 if (mos7720_port == NULL)
1433 return;
1434
1435 if (!mos7720_port->open) {
1436 dbg("port not opened");
1437 return;
1438 }
1439
1440 dbg("%s: Entering ..........", __func__);
1441
1442 /* if we are implementing XON/XOFF, send the stop character */
1443 if (I_IXOFF(tty)) {
1444 unsigned char stop_char = STOP_CHAR(tty);
1445 status = mos7720_write(tty, port, &stop_char, 1);
1446 if (status <= 0)
1447 return;
1448 }
1449
1450 /* if we are implementing RTS/CTS, toggle that line */
1451 if (tty->termios->c_cflag & CRTSCTS) {
1452 mos7720_port->shadowMCR &= ~UART_MCR_RTS;
1453 status = send_mos_cmd(port->serial, MOS_WRITE,
1454 port->number - port->serial->minor,
1455 UART_MCR, &mos7720_port->shadowMCR);
1456 if (status != 0)
1457 return;
1458 }
1459 }
1460
1461 static void mos7720_unthrottle(struct tty_struct *tty)
1462 {
1463 struct usb_serial_port *port = tty->driver_data;
1464 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1465 int status;
1466
1467 if (mos7720_port == NULL)
1468 return;
1469
1470 if (!mos7720_port->open) {
1471 dbg("%s - port not opened", __func__);
1472 return;
1473 }
1474
1475 dbg("%s: Entering ..........", __func__);
1476
1477 /* if we are implementing XON/XOFF, send the start character */
1478 if (I_IXOFF(tty)) {
1479 unsigned char start_char = START_CHAR(tty);
1480 status = mos7720_write(tty, port, &start_char, 1);
1481 if (status <= 0)
1482 return;
1483 }
1484
1485 /* if we are implementing RTS/CTS, toggle that line */
1486 if (tty->termios->c_cflag & CRTSCTS) {
1487 mos7720_port->shadowMCR |= UART_MCR_RTS;
1488 status = send_mos_cmd(port->serial, MOS_WRITE,
1489 port->number - port->serial->minor,
1490 UART_MCR, &mos7720_port->shadowMCR);
1491 if (status != 0)
1492 return;
1493 }
1494 }
1495
1496 /* FIXME: this function does not work */
1497 static int set_higher_rates(struct moschip_port *mos7720_port,
1498 unsigned int baud)
1499 {
1500 unsigned char data;
1501 struct usb_serial_port *port;
1502 struct usb_serial *serial;
1503 int port_number;
1504
1505 if (mos7720_port == NULL)
1506 return -EINVAL;
1507
1508 port = mos7720_port->port;
1509 serial = port->serial;
1510
1511 /***********************************************
1512 * Init Sequence for higher rates
1513 ***********************************************/
1514 dbg("Sending Setting Commands ..........");
1515 port_number = port->number - port->serial->minor;
1516
1517 data = 0x000;
1518 send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
1519 data = 0x000;
1520 send_mos_cmd(serial, MOS_WRITE, port_number, 0x02, &data);
1521 data = 0x0CF;
1522 send_mos_cmd(serial, MOS_WRITE, port->number, 0x02, &data);
1523 data = 0x00b;
1524 mos7720_port->shadowMCR = data;
1525 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
1526 data = 0x00b;
1527 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
1528
1529 data = 0x000;
1530 send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);
1531 data = 0x000;
1532 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &data);
1533
1534
1535 /***********************************************
1536 * Set for higher rates *
1537 ***********************************************/
1538
1539 /* writing baud rate verbatum into uart clock field clearly not right */
1540 data = baud * 0x10;
1541 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, port_number + 1, &data);
1542
1543 data = 0x003;
1544 send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);
1545 data = 0x003;
1546 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &data);
1547
1548 data = 0x02b;
1549 mos7720_port->shadowMCR = data;
1550 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
1551 data = 0x02b;
1552 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
1553
1554 /***********************************************
1555 * Set DLL/DLM
1556 ***********************************************/
1557
1558 data = mos7720_port->shadowLCR | UART_LCR_DLAB;
1559 mos7720_port->shadowLCR = data;
1560 send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
1561
1562 data = 0x001; /* DLL */
1563 send_mos_cmd(serial, MOS_WRITE, port_number, 0x00, &data);
1564 data = 0x000; /* DLM */
1565 send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
1566
1567 data = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1568 mos7720_port->shadowLCR = data;
1569 send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
1570
1571 return 0;
1572 }
1573
1574 /* baud rate information */
1575 struct divisor_table_entry {
1576 __u32 baudrate;
1577 __u16 divisor;
1578 };
1579
1580 /* Define table of divisors for moschip 7720 hardware *
1581 * These assume a 3.6864MHz crystal, the standard /16, and *
1582 * MCR.7 = 0. */
1583 static struct divisor_table_entry divisor_table[] = {
1584 { 50, 2304},
1585 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */
1586 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */
1587 { 150, 768},
1588 { 300, 384},
1589 { 600, 192},
1590 { 1200, 96},
1591 { 1800, 64},
1592 { 2400, 48},
1593 { 4800, 24},
1594 { 7200, 16},
1595 { 9600, 12},
1596 { 19200, 6},
1597 { 38400, 3},
1598 { 57600, 2},
1599 { 115200, 1},
1600 };
1601
1602 /*****************************************************************************
1603 * calc_baud_rate_divisor
1604 * this function calculates the proper baud rate divisor for the specified
1605 * baud rate.
1606 *****************************************************************************/
1607 static int calc_baud_rate_divisor(int baudrate, int *divisor)
1608 {
1609 int i;
1610 __u16 custom;
1611 __u16 round1;
1612 __u16 round;
1613
1614
1615 dbg("%s - %d", __func__, baudrate);
1616
1617 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) {
1618 if (divisor_table[i].baudrate == baudrate) {
1619 *divisor = divisor_table[i].divisor;
1620 return 0;
1621 }
1622 }
1623
1624 /* After trying for all the standard baud rates *
1625 * Try calculating the divisor for this baud rate */
1626 if (baudrate > 75 && baudrate < 230400) {
1627 /* get the divisor */
1628 custom = (__u16)(230400L / baudrate);
1629
1630 /* Check for round off */
1631 round1 = (__u16)(2304000L / baudrate);
1632 round = (__u16)(round1 - (custom * 10));
1633 if (round > 4)
1634 custom++;
1635 *divisor = custom;
1636
1637 dbg("Baud %d = %d", baudrate, custom);
1638 return 0;
1639 }
1640
1641 dbg("Baud calculation Failed...");
1642 return -EINVAL;
1643 }
1644
1645 /*
1646 * send_cmd_write_baud_rate
1647 * this function sends the proper command to change the baud rate of the
1648 * specified port.
1649 */
1650 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port,
1651 int baudrate)
1652 {
1653 struct usb_serial_port *port;
1654 struct usb_serial *serial;
1655 int divisor;
1656 int status;
1657 unsigned char data;
1658 unsigned char number;
1659
1660 if (mos7720_port == NULL)
1661 return -1;
1662
1663 port = mos7720_port->port;
1664 serial = port->serial;
1665
1666 dbg("%s: Entering ..........", __func__);
1667
1668 number = port->number - port->serial->minor;
1669 dbg("%s - port = %d, baud = %d", __func__, port->number, baudrate);
1670
1671 /* Calculate the Divisor */
1672 status = calc_baud_rate_divisor(baudrate, &divisor);
1673 if (status) {
1674 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1675 return status;
1676 }
1677
1678 /* Enable access to divisor latch */
1679 data = mos7720_port->shadowLCR | UART_LCR_DLAB;
1680 mos7720_port->shadowLCR = data;
1681 send_mos_cmd(serial, MOS_WRITE, number, UART_LCR, &data);
1682
1683 /* Write the divisor */
1684 data = ((unsigned char)(divisor & 0xff));
1685 send_mos_cmd(serial, MOS_WRITE, number, 0x00, &data);
1686
1687 data = ((unsigned char)((divisor & 0xff00) >> 8));
1688 send_mos_cmd(serial, MOS_WRITE, number, 0x01, &data);
1689
1690 /* Disable access to divisor latch */
1691 data = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1692 mos7720_port->shadowLCR = data;
1693 send_mos_cmd(serial, MOS_WRITE, number, 0x03, &data);
1694
1695 return status;
1696 }
1697
1698 /*
1699 * change_port_settings
1700 * This routine is called to set the UART on the device to match
1701 * the specified new settings.
1702 */
1703 static void change_port_settings(struct tty_struct *tty,
1704 struct moschip_port *mos7720_port,
1705 struct ktermios *old_termios)
1706 {
1707 struct usb_serial_port *port;
1708 struct usb_serial *serial;
1709 int baud;
1710 unsigned cflag;
1711 unsigned iflag;
1712 __u8 mask = 0xff;
1713 __u8 lData;
1714 __u8 lParity;
1715 __u8 lStop;
1716 int status;
1717 int port_number;
1718 char data;
1719
1720 if (mos7720_port == NULL)
1721 return ;
1722
1723 port = mos7720_port->port;
1724 serial = port->serial;
1725 port_number = port->number - port->serial->minor;
1726
1727 dbg("%s - port %d", __func__, port->number);
1728
1729 if (!mos7720_port->open) {
1730 dbg("%s - port not opened", __func__);
1731 return;
1732 }
1733
1734 dbg("%s: Entering ..........", __func__);
1735
1736 lData = UART_LCR_WLEN8;
1737 lStop = 0x00; /* 1 stop bit */
1738 lParity = 0x00; /* No parity */
1739
1740 cflag = tty->termios->c_cflag;
1741 iflag = tty->termios->c_iflag;
1742
1743 /* Change the number of bits */
1744 switch (cflag & CSIZE) {
1745 case CS5:
1746 lData = UART_LCR_WLEN5;
1747 mask = 0x1f;
1748 break;
1749
1750 case CS6:
1751 lData = UART_LCR_WLEN6;
1752 mask = 0x3f;
1753 break;
1754
1755 case CS7:
1756 lData = UART_LCR_WLEN7;
1757 mask = 0x7f;
1758 break;
1759 default:
1760 case CS8:
1761 lData = UART_LCR_WLEN8;
1762 break;
1763 }
1764
1765 /* Change the Parity bit */
1766 if (cflag & PARENB) {
1767 if (cflag & PARODD) {
1768 lParity = UART_LCR_PARITY;
1769 dbg("%s - parity = odd", __func__);
1770 } else {
1771 lParity = (UART_LCR_EPAR | UART_LCR_PARITY);
1772 dbg("%s - parity = even", __func__);
1773 }
1774
1775 } else {
1776 dbg("%s - parity = none", __func__);
1777 }
1778
1779 if (cflag & CMSPAR)
1780 lParity = lParity | 0x20;
1781
1782 /* Change the Stop bit */
1783 if (cflag & CSTOPB) {
1784 lStop = UART_LCR_STOP;
1785 dbg("%s - stop bits = 2", __func__);
1786 } else {
1787 lStop = 0x00;
1788 dbg("%s - stop bits = 1", __func__);
1789 }
1790
1791 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
1792 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
1793 #define LCR_PAR_MASK 0x38 /* Mask for parity field */
1794
1795 /* Update the LCR with the correct value */
1796 mos7720_port->shadowLCR &=
1797 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1798 mos7720_port->shadowLCR |= (lData | lParity | lStop);
1799
1800
1801 /* Disable Interrupts */
1802 data = 0x00;
1803 send_mos_cmd(serial, MOS_WRITE, port->number - port->serial->minor,
1804 UART_IER, &data);
1805
1806 data = 0x00;
1807 send_mos_cmd(serial, MOS_WRITE, port_number, UART_FCR, &data);
1808
1809 data = 0xcf;
1810 send_mos_cmd(serial, MOS_WRITE, port_number, UART_FCR, &data);
1811
1812 /* Send the updated LCR value to the mos7720 */
1813 data = mos7720_port->shadowLCR;
1814 send_mos_cmd(serial, MOS_WRITE, port_number, UART_LCR, &data);
1815
1816 data = 0x00b;
1817 mos7720_port->shadowMCR = data;
1818 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
1819 data = 0x00b;
1820 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
1821
1822 /* set up the MCR register and send it to the mos7720 */
1823 mos7720_port->shadowMCR = UART_MCR_OUT2;
1824 if (cflag & CBAUD)
1825 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS);
1826
1827 if (cflag & CRTSCTS) {
1828 mos7720_port->shadowMCR |= (UART_MCR_XONANY);
1829 /* To set hardware flow control to the specified *
1830 * serial port, in SP1/2_CONTROL_REG */
1831 if (port->number) {
1832 data = 0x001;
1833 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT,
1834 0x08, &data);
1835 } else {
1836 data = 0x002;
1837 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT,
1838 0x08, &data);
1839 }
1840 } else {
1841 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY);
1842 }
1843
1844 data = mos7720_port->shadowMCR;
1845 send_mos_cmd(serial, MOS_WRITE, port_number, UART_MCR, &data);
1846
1847 /* Determine divisor based on baud rate */
1848 baud = tty_get_baud_rate(tty);
1849 if (!baud) {
1850 /* pick a default, any default... */
1851 dbg("Picked default baud...");
1852 baud = 9600;
1853 }
1854
1855 if (baud >= 230400) {
1856 set_higher_rates(mos7720_port, baud);
1857 /* Enable Interrupts */
1858 data = 0x0c;
1859 send_mos_cmd(serial, MOS_WRITE, port_number, UART_IER, &data);
1860 return;
1861 }
1862
1863 dbg("%s - baud rate = %d", __func__, baud);
1864 status = send_cmd_write_baud_rate(mos7720_port, baud);
1865 /* FIXME: needs to write actual resulting baud back not just
1866 blindly do so */
1867 if (cflag & CBAUD)
1868 tty_encode_baud_rate(tty, baud, baud);
1869 /* Enable Interrupts */
1870 data = 0x0c;
1871 send_mos_cmd(serial, MOS_WRITE, port_number, UART_IER, &data);
1872
1873 if (port->read_urb->status != -EINPROGRESS) {
1874 port->read_urb->dev = serial->dev;
1875
1876 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1877 if (status)
1878 dbg("usb_submit_urb(read bulk) failed, status = %d",
1879 status);
1880 }
1881 return;
1882 }
1883
1884 /*
1885 * mos7720_set_termios
1886 * this function is called by the tty driver when it wants to change the
1887 * termios structure.
1888 */
1889 static void mos7720_set_termios(struct tty_struct *tty,
1890 struct usb_serial_port *port, struct ktermios *old_termios)
1891 {
1892 int status;
1893 unsigned int cflag;
1894 struct usb_serial *serial;
1895 struct moschip_port *mos7720_port;
1896
1897 serial = port->serial;
1898
1899 mos7720_port = usb_get_serial_port_data(port);
1900
1901 if (mos7720_port == NULL)
1902 return;
1903
1904 if (!mos7720_port->open) {
1905 dbg("%s - port not opened", __func__);
1906 return;
1907 }
1908
1909 dbg("%s\n", "setting termios - ASPIRE");
1910
1911 cflag = tty->termios->c_cflag;
1912
1913 dbg("%s - cflag %08x iflag %08x", __func__,
1914 tty->termios->c_cflag,
1915 RELEVANT_IFLAG(tty->termios->c_iflag));
1916
1917 dbg("%s - old cflag %08x old iflag %08x", __func__,
1918 old_termios->c_cflag,
1919 RELEVANT_IFLAG(old_termios->c_iflag));
1920
1921 dbg("%s - port %d", __func__, port->number);
1922
1923 /* change the port settings to the new ones specified */
1924 change_port_settings(tty, mos7720_port, old_termios);
1925
1926 if (!port->read_urb) {
1927 dbg("%s", "URB KILLED !!!!!");
1928 return;
1929 }
1930
1931 if (port->read_urb->status != -EINPROGRESS) {
1932 port->read_urb->dev = serial->dev;
1933 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1934 if (status)
1935 dbg("usb_submit_urb(read bulk) failed, status = %d",
1936 status);
1937 }
1938 return;
1939 }
1940
1941 /*
1942 * get_lsr_info - get line status register info
1943 *
1944 * Purpose: Let user call ioctl() to get info when the UART physically
1945 * is emptied. On bus types like RS485, the transmitter must
1946 * release the bus after transmitting. This must be done when
1947 * the transmit shift register is empty, not be done when the
1948 * transmit holding register is empty. This functionality
1949 * allows an RS485 driver to be written in user space.
1950 */
1951 static int get_lsr_info(struct tty_struct *tty,
1952 struct moschip_port *mos7720_port, unsigned int __user *value)
1953 {
1954 struct usb_serial_port *port = tty->driver_data;
1955 unsigned int result = 0;
1956 unsigned char data = 0;
1957 int port_number = port->number - port->serial->minor;
1958 int count;
1959
1960 count = mos7720_chars_in_buffer(tty);
1961 if (count == 0) {
1962 send_mos_cmd(port->serial, MOS_READ, port_number,
1963 UART_LSR, &data);
1964 if ((data & (UART_LSR_TEMT | UART_LSR_THRE))
1965 == (UART_LSR_TEMT | UART_LSR_THRE)) {
1966 dbg("%s -- Empty", __func__);
1967 result = TIOCSER_TEMT;
1968 }
1969 }
1970 if (copy_to_user(value, &result, sizeof(int)))
1971 return -EFAULT;
1972 return 0;
1973 }
1974
1975 static int mos7720_tiocmget(struct tty_struct *tty, struct file *file)
1976 {
1977 struct usb_serial_port *port = tty->driver_data;
1978 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1979 unsigned int result = 0;
1980 unsigned int mcr ;
1981 unsigned int msr ;
1982
1983 dbg("%s - port %d", __func__, port->number);
1984
1985 mcr = mos7720_port->shadowMCR;
1986 msr = mos7720_port->shadowMSR;
1987
1988 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */
1989 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */
1990 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */
1991 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */
1992 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */
1993 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
1994
1995 dbg("%s -- %x", __func__, result);
1996
1997 return result;
1998 }
1999
2000 static int mos7720_tiocmset(struct tty_struct *tty, struct file *file,
2001 unsigned int set, unsigned int clear)
2002 {
2003 struct usb_serial_port *port = tty->driver_data;
2004 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
2005 unsigned int mcr ;
2006 unsigned char lmcr;
2007
2008 dbg("%s - port %d", __func__, port->number);
2009 dbg("he was at tiocmget");
2010
2011 mcr = mos7720_port->shadowMCR;
2012
2013 if (set & TIOCM_RTS)
2014 mcr |= UART_MCR_RTS;
2015 if (set & TIOCM_DTR)
2016 mcr |= UART_MCR_DTR;
2017 if (set & TIOCM_LOOP)
2018 mcr |= UART_MCR_LOOP;
2019
2020 if (clear & TIOCM_RTS)
2021 mcr &= ~UART_MCR_RTS;
2022 if (clear & TIOCM_DTR)
2023 mcr &= ~UART_MCR_DTR;
2024 if (clear & TIOCM_LOOP)
2025 mcr &= ~UART_MCR_LOOP;
2026
2027 mos7720_port->shadowMCR = mcr;
2028 lmcr = mos7720_port->shadowMCR;
2029
2030 send_mos_cmd(port->serial, MOS_WRITE,
2031 port->number - port->serial->minor, UART_MCR, &lmcr);
2032
2033 return 0;
2034 }
2035
2036 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd,
2037 unsigned int __user *value)
2038 {
2039 unsigned int mcr ;
2040 unsigned int arg;
2041 unsigned char data;
2042
2043 struct usb_serial_port *port;
2044
2045 if (mos7720_port == NULL)
2046 return -1;
2047
2048 port = (struct usb_serial_port *)mos7720_port->port;
2049 mcr = mos7720_port->shadowMCR;
2050
2051 if (copy_from_user(&arg, value, sizeof(int)))
2052 return -EFAULT;
2053
2054 switch (cmd) {
2055 case TIOCMBIS:
2056 if (arg & TIOCM_RTS)
2057 mcr |= UART_MCR_RTS;
2058 if (arg & TIOCM_DTR)
2059 mcr |= UART_MCR_RTS;
2060 if (arg & TIOCM_LOOP)
2061 mcr |= UART_MCR_LOOP;
2062 break;
2063
2064 case TIOCMBIC:
2065 if (arg & TIOCM_RTS)
2066 mcr &= ~UART_MCR_RTS;
2067 if (arg & TIOCM_DTR)
2068 mcr &= ~UART_MCR_RTS;
2069 if (arg & TIOCM_LOOP)
2070 mcr &= ~UART_MCR_LOOP;
2071 break;
2072
2073 }
2074
2075 mos7720_port->shadowMCR = mcr;
2076
2077 data = mos7720_port->shadowMCR;
2078 send_mos_cmd(port->serial, MOS_WRITE,
2079 port->number - port->serial->minor, UART_MCR, &data);
2080
2081 return 0;
2082 }
2083
2084 static int get_serial_info(struct moschip_port *mos7720_port,
2085 struct serial_struct __user *retinfo)
2086 {
2087 struct serial_struct tmp;
2088
2089 if (!retinfo)
2090 return -EFAULT;
2091
2092 memset(&tmp, 0, sizeof(tmp));
2093
2094 tmp.type = PORT_16550A;
2095 tmp.line = mos7720_port->port->serial->minor;
2096 tmp.port = mos7720_port->port->number;
2097 tmp.irq = 0;
2098 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2099 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2100 tmp.baud_base = 9600;
2101 tmp.close_delay = 5*HZ;
2102 tmp.closing_wait = 30*HZ;
2103
2104 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2105 return -EFAULT;
2106 return 0;
2107 }
2108
2109 static int mos7720_ioctl(struct tty_struct *tty, struct file *file,
2110 unsigned int cmd, unsigned long arg)
2111 {
2112 struct usb_serial_port *port = tty->driver_data;
2113 struct moschip_port *mos7720_port;
2114 struct async_icount cnow;
2115 struct async_icount cprev;
2116 struct serial_icounter_struct icount;
2117
2118 mos7720_port = usb_get_serial_port_data(port);
2119 if (mos7720_port == NULL)
2120 return -ENODEV;
2121
2122 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2123
2124 switch (cmd) {
2125 case TIOCSERGETLSR:
2126 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2127 return get_lsr_info(tty, mos7720_port,
2128 (unsigned int __user *)arg);
2129 return 0;
2130
2131 /* FIXME: These should be using the mode methods */
2132 case TIOCMBIS:
2133 case TIOCMBIC:
2134 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET",
2135 __func__, port->number);
2136 return set_modem_info(mos7720_port, cmd,
2137 (unsigned int __user *)arg);
2138
2139 case TIOCGSERIAL:
2140 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2141 return get_serial_info(mos7720_port,
2142 (struct serial_struct __user *)arg);
2143
2144 case TIOCMIWAIT:
2145 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2146 cprev = mos7720_port->icount;
2147 while (1) {
2148 if (signal_pending(current))
2149 return -ERESTARTSYS;
2150 cnow = mos7720_port->icount;
2151 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2152 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2153 return -EIO; /* no change => error */
2154 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2155 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2156 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2157 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2158 return 0;
2159 }
2160 cprev = cnow;
2161 }
2162 /* NOTREACHED */
2163 break;
2164
2165 case TIOCGICOUNT:
2166 cnow = mos7720_port->icount;
2167 icount.cts = cnow.cts;
2168 icount.dsr = cnow.dsr;
2169 icount.rng = cnow.rng;
2170 icount.dcd = cnow.dcd;
2171 icount.rx = cnow.rx;
2172 icount.tx = cnow.tx;
2173 icount.frame = cnow.frame;
2174 icount.overrun = cnow.overrun;
2175 icount.parity = cnow.parity;
2176 icount.brk = cnow.brk;
2177 icount.buf_overrun = cnow.buf_overrun;
2178
2179 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2180 port->number, icount.rx, icount.tx);
2181 if (copy_to_user((void __user *)arg, &icount, sizeof(icount)))
2182 return -EFAULT;
2183 return 0;
2184 }
2185
2186 return -ENOIOCTLCMD;
2187 }
2188
2189 static int mos7720_startup(struct usb_serial *serial)
2190 {
2191 struct moschip_port *mos7720_port;
2192 struct usb_device *dev;
2193 int i;
2194 char data;
2195 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
2196 int ret_val;
2197
2198 dbg("%s: Entering ..........", __func__);
2199
2200 if (!serial) {
2201 dbg("Invalid Handler");
2202 return -ENODEV;
2203 }
2204
2205 dev = serial->dev;
2206
2207 /*
2208 * The 7715 uses the first bulk in/out endpoint pair for the parallel
2209 * port, and the second for the serial port. Because the usbserial core
2210 * assumes both pairs are serial ports, we must engage in a bit of
2211 * subterfuge and swap the pointers for ports 0 and 1 in order to make
2212 * port 0 point to the serial port. However, both moschip devices use a
2213 * single interrupt-in endpoint for both ports (as mentioned a little
2214 * further down), and this endpoint was assigned to port 0. So after
2215 * the swap, we must copy the interrupt endpoint elements from port 1
2216 * (as newly assigned) to port 0, and null out port 1 pointers.
2217 */
2218 if (product == MOSCHIP_DEVICE_ID_7715) {
2219 struct usb_serial_port *tmp = serial->port[0];
2220 serial->port[0] = serial->port[1];
2221 serial->port[1] = tmp;
2222 serial->port[0]->interrupt_in_urb = tmp->interrupt_in_urb;
2223 serial->port[0]->interrupt_in_buffer = tmp->interrupt_in_buffer;
2224 serial->port[0]->interrupt_in_endpointAddress =
2225 tmp->interrupt_in_endpointAddress;
2226 serial->port[1]->interrupt_in_urb = NULL;
2227 serial->port[1]->interrupt_in_buffer = NULL;
2228 }
2229
2230
2231 /* set up serial port private structures */
2232 for (i = 0; i < serial->num_ports; ++i) {
2233 mos7720_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2234 if (mos7720_port == NULL) {
2235 dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2236 return -ENOMEM;
2237 }
2238
2239 /* Initialize all port interrupt end point to port 0 int
2240 * endpoint. Our device has only one interrupt endpoint
2241 * common to all ports */
2242 serial->port[i]->interrupt_in_endpointAddress =
2243 serial->port[0]->interrupt_in_endpointAddress;
2244
2245 mos7720_port->port = serial->port[i];
2246 usb_set_serial_port_data(serial->port[i], mos7720_port);
2247
2248 dbg("port number is %d", serial->port[i]->number);
2249 dbg("serial number is %d", serial->minor);
2250 }
2251
2252
2253 /* setting configuration feature to one */
2254 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2255 (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5*HZ);
2256
2257 /* start the interrupt urb */
2258 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL);
2259 if (ret_val)
2260 dev_err(&dev->dev,
2261 "%s - Error %d submitting control urb\n",
2262 __func__, ret_val);
2263
2264 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
2265 if (product == MOSCHIP_DEVICE_ID_7715) {
2266 ret_val = mos7715_parport_init(serial);
2267 if (ret_val < 0)
2268 return ret_val;
2269 }
2270 #endif
2271 /* LSR For Port 1 */
2272 send_mos_cmd(serial, MOS_READ, 0x00, UART_LSR, &data);
2273 dbg("LSR:%x", data);
2274
2275 /* LSR For Port 2 */
2276 send_mos_cmd(serial, MOS_READ, 0x01, UART_LSR, &data);
2277 dbg("LSR:%x", data);
2278
2279 return 0;
2280 }
2281
2282 static void mos7720_release(struct usb_serial *serial)
2283 {
2284 int i;
2285
2286 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
2287 /* close the parallel port */
2288
2289 if (le16_to_cpu(serial->dev->descriptor.idProduct)
2290 == MOSCHIP_DEVICE_ID_7715) {
2291 struct urbtracker *urbtrack;
2292 unsigned long flags;
2293 struct mos7715_parport *mos_parport =
2294 usb_get_serial_data(serial);
2295
2296 /* prevent NULL ptr dereference in port callbacks */
2297 spin_lock(&release_lock);
2298 mos_parport->pp->private_data = NULL;
2299 spin_unlock(&release_lock);
2300
2301 /* wait for synchronous usb calls to return */
2302 if (mos_parport->msg_pending)
2303 wait_for_completion_timeout(&mos_parport->syncmsg_compl,
2304 MOS_WDR_TIMEOUT);
2305
2306 parport_remove_port(mos_parport->pp);
2307 usb_set_serial_data(serial, NULL);
2308 mos_parport->serial = NULL;
2309
2310 /* if tasklet currently scheduled, wait for it to complete */
2311 tasklet_kill(&mos_parport->urb_tasklet);
2312
2313 /* unlink any urbs sent by the tasklet */
2314 spin_lock_irqsave(&mos_parport->listlock, flags);
2315 list_for_each_entry(urbtrack,
2316 &mos_parport->active_urbs,
2317 urblist_entry)
2318 usb_unlink_urb(urbtrack->urb);
2319 spin_unlock_irqrestore(&mos_parport->listlock, flags);
2320
2321 kref_put(&mos_parport->ref_count, destroy_mos_parport);
2322 }
2323 #endif
2324 /* free private structure allocated for serial port */
2325 for (i = 0; i < serial->num_ports; ++i)
2326 kfree(usb_get_serial_port_data(serial->port[i]));
2327 }
2328
2329 static struct usb_driver usb_driver = {
2330 .name = "moschip7720",
2331 .probe = usb_serial_probe,
2332 .disconnect = usb_serial_disconnect,
2333 .id_table = moschip_port_id_table,
2334 .no_dynamic_id = 1,
2335 };
2336
2337 static struct usb_serial_driver moschip7720_2port_driver = {
2338 .driver = {
2339 .owner = THIS_MODULE,
2340 .name = "moschip7720",
2341 },
2342 .description = "Moschip 2 port adapter",
2343 .usb_driver = &usb_driver,
2344 .id_table = moschip_port_id_table,
2345 .calc_num_ports = mos77xx_calc_num_ports,
2346 .open = mos7720_open,
2347 .close = mos7720_close,
2348 .throttle = mos7720_throttle,
2349 .unthrottle = mos7720_unthrottle,
2350 .probe = mos77xx_probe,
2351 .attach = mos7720_startup,
2352 .release = mos7720_release,
2353 .ioctl = mos7720_ioctl,
2354 .tiocmget = mos7720_tiocmget,
2355 .tiocmset = mos7720_tiocmset,
2356 .set_termios = mos7720_set_termios,
2357 .write = mos7720_write,
2358 .write_room = mos7720_write_room,
2359 .chars_in_buffer = mos7720_chars_in_buffer,
2360 .break_ctl = mos7720_break,
2361 .read_bulk_callback = mos7720_bulk_in_callback,
2362 .read_int_callback = NULL /* dynamically assigned in probe() */
2363 };
2364
2365 static int __init moschip7720_init(void)
2366 {
2367 int retval;
2368
2369 dbg("%s: Entering ..........", __func__);
2370
2371 /* Register with the usb serial */
2372 retval = usb_serial_register(&moschip7720_2port_driver);
2373 if (retval)
2374 goto failed_port_device_register;
2375
2376 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2377 DRIVER_DESC "\n");
2378
2379 /* Register with the usb */
2380 retval = usb_register(&usb_driver);
2381 if (retval)
2382 goto failed_usb_register;
2383
2384 return 0;
2385
2386 failed_usb_register:
2387 usb_serial_deregister(&moschip7720_2port_driver);
2388
2389 failed_port_device_register:
2390 return retval;
2391 }
2392
2393 static void __exit moschip7720_exit(void)
2394 {
2395 usb_deregister(&usb_driver);
2396 usb_serial_deregister(&moschip7720_2port_driver);
2397 }
2398
2399 module_init(moschip7720_init);
2400 module_exit(moschip7720_exit);
2401
2402 /* Module information */
2403 MODULE_AUTHOR(DRIVER_AUTHOR);
2404 MODULE_DESCRIPTION(DRIVER_DESC);
2405 MODULE_LICENSE("GPL");
2406
2407 module_param(debug, bool, S_IRUGO | S_IWUSR);
2408 MODULE_PARM_DESC(debug, "Debug enabled or not");
Linux kernel - Deliverables
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