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tty: Convert the USB drivers to the new icount interface
[linux-2.6/libata-dev.git] / drivers / usb / serial / mos7720.c
blobfd0b6414f45975e45a6a4d52bd1c887b7b945996
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 return;
831 }
832
833 /*
834 * mos7715_interrupt_callback
835 * this is the 7715's callback function for when we have received data on
836 * the interrupt endpoint.
837 */
838 static void mos7715_interrupt_callback(struct urb *urb)
839 {
840 int result;
841 int length;
842 int status = urb->status;
843 __u8 *data;
844 __u8 iir;
845
846 switch (status) {
847 case 0:
848 /* success */
849 break;
850 case -ECONNRESET:
851 case -ENOENT:
852 case -ESHUTDOWN:
853 case -ENODEV:
854 /* this urb is terminated, clean up */
855 dbg("%s - urb shutting down with status: %d", __func__,
856 status);
857 return;
858 default:
859 dbg("%s - nonzero urb status received: %d", __func__,
860 status);
861 goto exit;
862 }
863
864 length = urb->actual_length;
865 data = urb->transfer_buffer;
866
867 /* Structure of data from 7715 device:
868 * Byte 1: IIR serial Port
869 * Byte 2: unused
870 * Byte 2: DSR parallel port
871 * Byte 4: FIFO status for both */
872
873 if (unlikely(length != 4)) {
874 dbg("Wrong data !!!");
875 return;
876 }
877
878 iir = data[0];
879 if (!(iir & 0x01)) { /* serial port interrupt pending */
880 switch (iir & 0x0f) {
881 case SERIAL_IIR_RLS:
882 dbg("Serial Port: Receiver status error or address "
883 "bit detected in 9-bit mode\n");
884 break;
885 case SERIAL_IIR_CTI:
886 dbg("Serial Port: Receiver time out");
887 break;
888 case SERIAL_IIR_MS:
889 /* dbg("Serial Port: Modem status change"); */
890 break;
891 }
892 }
893
894 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
895 { /* update local copy of DSR reg */
896 struct usb_serial_port *port = urb->context;
897 struct mos7715_parport *mos_parport = port->serial->private;
898 if (unlikely(mos_parport == NULL))
899 return;
900 atomic_set(&mos_parport->shadowDSR, data[2]);
901 }
902 #endif
903
904 exit:
905 result = usb_submit_urb(urb, GFP_ATOMIC);
906 if (result)
907 dev_err(&urb->dev->dev,
908 "%s - Error %d submitting control urb\n",
909 __func__, result);
910 return;
911 }
912
913 /*
914 * mos7720_bulk_in_callback
915 * this is the callback function for when we have received data on the
916 * bulk in endpoint.
917 */
918 static void mos7720_bulk_in_callback(struct urb *urb)
919 {
920 int retval;
921 unsigned char *data ;
922 struct usb_serial_port *port;
923 struct tty_struct *tty;
924 int status = urb->status;
925
926 if (status) {
927 dbg("nonzero read bulk status received: %d", status);
928 return;
929 }
930
931 port = urb->context;
932
933 dbg("Entering...%s", __func__);
934
935 data = urb->transfer_buffer;
936
937 tty = tty_port_tty_get(&port->port);
938 if (tty && urb->actual_length) {
939 tty_insert_flip_string(tty, data, urb->actual_length);
940 tty_flip_buffer_push(tty);
941 }
942 tty_kref_put(tty);
943
944 if (!port->read_urb) {
945 dbg("URB KILLED !!!");
946 return;
947 }
948
949 if (port->read_urb->status != -EINPROGRESS) {
950 port->read_urb->dev = port->serial->dev;
951
952 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
953 if (retval)
954 dbg("usb_submit_urb(read bulk) failed, retval = %d",
955 retval);
956 }
957 }
958
959 /*
960 * mos7720_bulk_out_data_callback
961 * this is the callback function for when we have finished sending serial
962 * data on the bulk out endpoint.
963 */
964 static void mos7720_bulk_out_data_callback(struct urb *urb)
965 {
966 struct moschip_port *mos7720_port;
967 struct tty_struct *tty;
968 int status = urb->status;
969
970 if (status) {
971 dbg("nonzero write bulk status received:%d", status);
972 return;
973 }
974
975 mos7720_port = urb->context;
976 if (!mos7720_port) {
977 dbg("NULL mos7720_port pointer");
978 return ;
979 }
980
981 tty = tty_port_tty_get(&mos7720_port->port->port);
982
983 if (tty && mos7720_port->open)
984 tty_wakeup(tty);
985 tty_kref_put(tty);
986 }
987
988 /*
989 * mos77xx_probe
990 * this function installs the appropriate read interrupt endpoint callback
991 * depending on whether the device is a 7720 or 7715, thus avoiding costly
992 * run-time checks in the high-frequency callback routine itself.
993 */
994 static int mos77xx_probe(struct usb_serial *serial,
995 const struct usb_device_id *id)
996 {
997 if (id->idProduct == MOSCHIP_DEVICE_ID_7715)
998 moschip7720_2port_driver.read_int_callback =
999 mos7715_interrupt_callback;
1000 else
1001 moschip7720_2port_driver.read_int_callback =
1002 mos7720_interrupt_callback;
1003
1004 return 0;
1005 }
1006
1007 static int mos77xx_calc_num_ports(struct usb_serial *serial)
1008 {
1009 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
1010 if (product == MOSCHIP_DEVICE_ID_7715)
1011 return 1;
1012
1013 return 2;
1014 }
1015
1016 static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port)
1017 {
1018 struct usb_serial *serial;
1019 struct usb_serial_port *port0;
1020 struct urb *urb;
1021 struct moschip_port *mos7720_port;
1022 int response;
1023 int port_number;
1024 __u8 data;
1025 int allocated_urbs = 0;
1026 int j;
1027
1028 serial = port->serial;
1029
1030 mos7720_port = usb_get_serial_port_data(port);
1031 if (mos7720_port == NULL)
1032 return -ENODEV;
1033
1034 port0 = serial->port[0];
1035
1036 usb_clear_halt(serial->dev, port->write_urb->pipe);
1037 usb_clear_halt(serial->dev, port->read_urb->pipe);
1038
1039 /* Initialising the write urb pool */
1040 for (j = 0; j < NUM_URBS; ++j) {
1041 urb = usb_alloc_urb(0, GFP_KERNEL);
1042 mos7720_port->write_urb_pool[j] = urb;
1043
1044 if (urb == NULL) {
1045 dev_err(&port->dev, "No more urbs???\n");
1046 continue;
1047 }
1048
1049 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1050 GFP_KERNEL);
1051 if (!urb->transfer_buffer) {
1052 dev_err(&port->dev,
1053 "%s-out of memory for urb buffers.\n",
1054 __func__);
1055 usb_free_urb(mos7720_port->write_urb_pool[j]);
1056 mos7720_port->write_urb_pool[j] = NULL;
1057 continue;
1058 }
1059 allocated_urbs++;
1060 }
1061
1062 if (!allocated_urbs)
1063 return -ENOMEM;
1064
1065 /* Initialize MCS7720 -- Write Init values to corresponding Registers
1066 *
1067 * Register Index
1068 * 0 : THR/RHR
1069 * 1 : IER
1070 * 2 : FCR
1071 * 3 : LCR
1072 * 4 : MCR
1073 * 5 : LSR
1074 * 6 : MSR
1075 * 7 : SPR
1076 *
1077 * 0x08 : SP1/2 Control Reg
1078 */
1079 port_number = port->number - port->serial->minor;
1080 read_mos_reg(serial, port_number, LSR, &data);
1081
1082 dbg("SS::%p LSR:%x", mos7720_port, data);
1083
1084 dbg("Check:Sending Command ..........");
1085
1086 write_mos_reg(serial, dummy, SP1_REG, 0x02);
1087 write_mos_reg(serial, dummy, SP2_REG, 0x02);
1088
1089 write_mos_reg(serial, port_number, IER, 0x00);
1090 write_mos_reg(serial, port_number, FCR, 0x00);
1091
1092 write_mos_reg(serial, port_number, FCR, 0xcf);
1093 mos7720_port->shadowLCR = 0x03;
1094 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1095 mos7720_port->shadowMCR = 0x0b;
1096 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1097
1098 write_mos_reg(serial, port_number, SP_CONTROL_REG, 0x00);
1099 read_mos_reg(serial, dummy, SP_CONTROL_REG, &data);
1100 data = data | (port->number - port->serial->minor + 1);
1101 write_mos_reg(serial, dummy, SP_CONTROL_REG, data);
1102 mos7720_port->shadowLCR = 0x83;
1103 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1104 write_mos_reg(serial, port_number, THR, 0x0c);
1105 write_mos_reg(serial, port_number, IER, 0x00);
1106 mos7720_port->shadowLCR = 0x03;
1107 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1108 write_mos_reg(serial, port_number, IER, 0x0c);
1109
1110 response = usb_submit_urb(port->read_urb, GFP_KERNEL);
1111 if (response)
1112 dev_err(&port->dev, "%s - Error %d submitting read urb\n",
1113 __func__, response);
1114
1115 /* initialize our icount structure */
1116 memset(&(mos7720_port->icount), 0x00, sizeof(mos7720_port->icount));
1117
1118 /* initialize our port settings */
1119 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */
1120
1121 /* send a open port command */
1122 mos7720_port->open = 1;
1123
1124 return 0;
1125 }
1126
1127 /*
1128 * mos7720_chars_in_buffer
1129 * this function is called by the tty driver when it wants to know how many
1130 * bytes of data we currently have outstanding in the port (data that has
1131 * been written, but hasn't made it out the port yet)
1132 * If successful, we return the number of bytes left to be written in the
1133 * system,
1134 * Otherwise we return a negative error number.
1135 */
1136 static int mos7720_chars_in_buffer(struct tty_struct *tty)
1137 {
1138 struct usb_serial_port *port = tty->driver_data;
1139 int i;
1140 int chars = 0;
1141 struct moschip_port *mos7720_port;
1142
1143 dbg("%s:entering ...........", __func__);
1144
1145 mos7720_port = usb_get_serial_port_data(port);
1146 if (mos7720_port == NULL) {
1147 dbg("%s:leaving ...........", __func__);
1148 return 0;
1149 }
1150
1151 for (i = 0; i < NUM_URBS; ++i) {
1152 if (mos7720_port->write_urb_pool[i] &&
1153 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS)
1154 chars += URB_TRANSFER_BUFFER_SIZE;
1155 }
1156 dbg("%s - returns %d", __func__, chars);
1157 return chars;
1158 }
1159
1160 static void mos7720_close(struct usb_serial_port *port)
1161 {
1162 struct usb_serial *serial;
1163 struct moschip_port *mos7720_port;
1164 int j;
1165
1166 dbg("mos7720_close:entering...");
1167
1168 serial = port->serial;
1169
1170 mos7720_port = usb_get_serial_port_data(port);
1171 if (mos7720_port == NULL)
1172 return;
1173
1174 for (j = 0; j < NUM_URBS; ++j)
1175 usb_kill_urb(mos7720_port->write_urb_pool[j]);
1176
1177 /* Freeing Write URBs */
1178 for (j = 0; j < NUM_URBS; ++j) {
1179 if (mos7720_port->write_urb_pool[j]) {
1180 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer);
1181 usb_free_urb(mos7720_port->write_urb_pool[j]);
1182 }
1183 }
1184
1185 /* While closing port, shutdown all bulk read, write *
1186 * and interrupt read if they exists, otherwise nop */
1187 dbg("Shutdown bulk write");
1188 usb_kill_urb(port->write_urb);
1189 dbg("Shutdown bulk read");
1190 usb_kill_urb(port->read_urb);
1191
1192 mutex_lock(&serial->disc_mutex);
1193 /* these commands must not be issued if the device has
1194 * been disconnected */
1195 if (!serial->disconnected) {
1196 write_mos_reg(serial, port->number - port->serial->minor,
1197 MCR, 0x00);
1198 write_mos_reg(serial, port->number - port->serial->minor,
1199 IER, 0x00);
1200 }
1201 mutex_unlock(&serial->disc_mutex);
1202 mos7720_port->open = 0;
1203
1204 dbg("Leaving %s", __func__);
1205 }
1206
1207 static void mos7720_break(struct tty_struct *tty, int break_state)
1208 {
1209 struct usb_serial_port *port = tty->driver_data;
1210 unsigned char data;
1211 struct usb_serial *serial;
1212 struct moschip_port *mos7720_port;
1213
1214 dbg("Entering %s", __func__);
1215
1216 serial = port->serial;
1217
1218 mos7720_port = usb_get_serial_port_data(port);
1219 if (mos7720_port == NULL)
1220 return;
1221
1222 if (break_state == -1)
1223 data = mos7720_port->shadowLCR | UART_LCR_SBC;
1224 else
1225 data = mos7720_port->shadowLCR & ~UART_LCR_SBC;
1226
1227 mos7720_port->shadowLCR = data;
1228 write_mos_reg(serial, port->number - port->serial->minor,
1229 LCR, mos7720_port->shadowLCR);
1230
1231 return;
1232 }
1233
1234 /*
1235 * mos7720_write_room
1236 * this function is called by the tty driver when it wants to know how many
1237 * bytes of data we can accept for a specific port.
1238 * If successful, we return the amount of room that we have for this port
1239 * Otherwise we return a negative error number.
1240 */
1241 static int mos7720_write_room(struct tty_struct *tty)
1242 {
1243 struct usb_serial_port *port = tty->driver_data;
1244 struct moschip_port *mos7720_port;
1245 int room = 0;
1246 int i;
1247
1248 dbg("%s:entering ...........", __func__);
1249
1250 mos7720_port = usb_get_serial_port_data(port);
1251 if (mos7720_port == NULL) {
1252 dbg("%s:leaving ...........", __func__);
1253 return -ENODEV;
1254 }
1255
1256 /* FIXME: Locking */
1257 for (i = 0; i < NUM_URBS; ++i) {
1258 if (mos7720_port->write_urb_pool[i] &&
1259 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS)
1260 room += URB_TRANSFER_BUFFER_SIZE;
1261 }
1262
1263 dbg("%s - returns %d", __func__, room);
1264 return room;
1265 }
1266
1267 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port,
1268 const unsigned char *data, int count)
1269 {
1270 int status;
1271 int i;
1272 int bytes_sent = 0;
1273 int transfer_size;
1274
1275 struct moschip_port *mos7720_port;
1276 struct usb_serial *serial;
1277 struct urb *urb;
1278 const unsigned char *current_position = data;
1279
1280 dbg("%s:entering ...........", __func__);
1281
1282 serial = port->serial;
1283
1284 mos7720_port = usb_get_serial_port_data(port);
1285 if (mos7720_port == NULL) {
1286 dbg("mos7720_port is NULL");
1287 return -ENODEV;
1288 }
1289
1290 /* try to find a free urb in the list */
1291 urb = NULL;
1292
1293 for (i = 0; i < NUM_URBS; ++i) {
1294 if (mos7720_port->write_urb_pool[i] &&
1295 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) {
1296 urb = mos7720_port->write_urb_pool[i];
1297 dbg("URB:%d", i);
1298 break;
1299 }
1300 }
1301
1302 if (urb == NULL) {
1303 dbg("%s - no more free urbs", __func__);
1304 goto exit;
1305 }
1306
1307 if (urb->transfer_buffer == NULL) {
1308 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1309 GFP_KERNEL);
1310 if (urb->transfer_buffer == NULL) {
1311 dev_err(&port->dev, "%s no more kernel memory...\n",
1312 __func__);
1313 goto exit;
1314 }
1315 }
1316 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1317
1318 memcpy(urb->transfer_buffer, current_position, transfer_size);
1319 usb_serial_debug_data(debug, &port->dev, __func__, transfer_size,
1320 urb->transfer_buffer);
1321
1322 /* fill urb with data and submit */
1323 usb_fill_bulk_urb(urb, serial->dev,
1324 usb_sndbulkpipe(serial->dev,
1325 port->bulk_out_endpointAddress),
1326 urb->transfer_buffer, transfer_size,
1327 mos7720_bulk_out_data_callback, mos7720_port);
1328
1329 /* send it down the pipe */
1330 status = usb_submit_urb(urb, GFP_ATOMIC);
1331 if (status) {
1332 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1333 "with status = %d\n", __func__, status);
1334 bytes_sent = status;
1335 goto exit;
1336 }
1337 bytes_sent = transfer_size;
1338
1339 exit:
1340 return bytes_sent;
1341 }
1342
1343 static void mos7720_throttle(struct tty_struct *tty)
1344 {
1345 struct usb_serial_port *port = tty->driver_data;
1346 struct moschip_port *mos7720_port;
1347 int status;
1348
1349 dbg("%s- port %d", __func__, port->number);
1350
1351 mos7720_port = usb_get_serial_port_data(port);
1352
1353 if (mos7720_port == NULL)
1354 return;
1355
1356 if (!mos7720_port->open) {
1357 dbg("port not opened");
1358 return;
1359 }
1360
1361 dbg("%s: Entering ..........", __func__);
1362
1363 /* if we are implementing XON/XOFF, send the stop character */
1364 if (I_IXOFF(tty)) {
1365 unsigned char stop_char = STOP_CHAR(tty);
1366 status = mos7720_write(tty, port, &stop_char, 1);
1367 if (status <= 0)
1368 return;
1369 }
1370
1371 /* if we are implementing RTS/CTS, toggle that line */
1372 if (tty->termios->c_cflag & CRTSCTS) {
1373 mos7720_port->shadowMCR &= ~UART_MCR_RTS;
1374 write_mos_reg(port->serial, port->number - port->serial->minor,
1375 MCR, mos7720_port->shadowMCR);
1376 if (status != 0)
1377 return;
1378 }
1379 }
1380
1381 static void mos7720_unthrottle(struct tty_struct *tty)
1382 {
1383 struct usb_serial_port *port = tty->driver_data;
1384 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1385 int status;
1386
1387 if (mos7720_port == NULL)
1388 return;
1389
1390 if (!mos7720_port->open) {
1391 dbg("%s - port not opened", __func__);
1392 return;
1393 }
1394
1395 dbg("%s: Entering ..........", __func__);
1396
1397 /* if we are implementing XON/XOFF, send the start character */
1398 if (I_IXOFF(tty)) {
1399 unsigned char start_char = START_CHAR(tty);
1400 status = mos7720_write(tty, port, &start_char, 1);
1401 if (status <= 0)
1402 return;
1403 }
1404
1405 /* if we are implementing RTS/CTS, toggle that line */
1406 if (tty->termios->c_cflag & CRTSCTS) {
1407 mos7720_port->shadowMCR |= UART_MCR_RTS;
1408 write_mos_reg(port->serial, port->number - port->serial->minor,
1409 MCR, mos7720_port->shadowMCR);
1410 if (status != 0)
1411 return;
1412 }
1413 }
1414
1415 /* FIXME: this function does not work */
1416 static int set_higher_rates(struct moschip_port *mos7720_port,
1417 unsigned int baud)
1418 {
1419 struct usb_serial_port *port;
1420 struct usb_serial *serial;
1421 int port_number;
1422 enum mos_regs sp_reg;
1423 if (mos7720_port == NULL)
1424 return -EINVAL;
1425
1426 port = mos7720_port->port;
1427 serial = port->serial;
1428
1429 /***********************************************
1430 * Init Sequence for higher rates
1431 ***********************************************/
1432 dbg("Sending Setting Commands ..........");
1433 port_number = port->number - port->serial->minor;
1434
1435 write_mos_reg(serial, port_number, IER, 0x00);
1436 write_mos_reg(serial, port_number, FCR, 0x00);
1437 write_mos_reg(serial, port_number, FCR, 0xcf);
1438 mos7720_port->shadowMCR = 0x0b;
1439 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1440 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x00);
1441
1442 /***********************************************
1443 * Set for higher rates *
1444 ***********************************************/
1445 /* writing baud rate verbatum into uart clock field clearly not right */
1446 if (port_number == 0)
1447 sp_reg = SP1_REG;
1448 else
1449 sp_reg = SP2_REG;
1450 write_mos_reg(serial, dummy, sp_reg, baud * 0x10);
1451 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x03);
1452 mos7720_port->shadowMCR = 0x2b;
1453 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1454
1455 /***********************************************
1456 * Set DLL/DLM
1457 ***********************************************/
1458 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1459 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1460 write_mos_reg(serial, port_number, DLL, 0x01);
1461 write_mos_reg(serial, port_number, DLM, 0x00);
1462 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1463 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1464
1465 return 0;
1466 }
1467
1468 /* baud rate information */
1469 struct divisor_table_entry {
1470 __u32 baudrate;
1471 __u16 divisor;
1472 };
1473
1474 /* Define table of divisors for moschip 7720 hardware *
1475 * These assume a 3.6864MHz crystal, the standard /16, and *
1476 * MCR.7 = 0. */
1477 static struct divisor_table_entry divisor_table[] = {
1478 { 50, 2304},
1479 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */
1480 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */
1481 { 150, 768},
1482 { 300, 384},
1483 { 600, 192},
1484 { 1200, 96},
1485 { 1800, 64},
1486 { 2400, 48},
1487 { 4800, 24},
1488 { 7200, 16},
1489 { 9600, 12},
1490 { 19200, 6},
1491 { 38400, 3},
1492 { 57600, 2},
1493 { 115200, 1},
1494 };
1495
1496 /*****************************************************************************
1497 * calc_baud_rate_divisor
1498 * this function calculates the proper baud rate divisor for the specified
1499 * baud rate.
1500 *****************************************************************************/
1501 static int calc_baud_rate_divisor(int baudrate, int *divisor)
1502 {
1503 int i;
1504 __u16 custom;
1505 __u16 round1;
1506 __u16 round;
1507
1508
1509 dbg("%s - %d", __func__, baudrate);
1510
1511 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) {
1512 if (divisor_table[i].baudrate == baudrate) {
1513 *divisor = divisor_table[i].divisor;
1514 return 0;
1515 }
1516 }
1517
1518 /* After trying for all the standard baud rates *
1519 * Try calculating the divisor for this baud rate */
1520 if (baudrate > 75 && baudrate < 230400) {
1521 /* get the divisor */
1522 custom = (__u16)(230400L / baudrate);
1523
1524 /* Check for round off */
1525 round1 = (__u16)(2304000L / baudrate);
1526 round = (__u16)(round1 - (custom * 10));
1527 if (round > 4)
1528 custom++;
1529 *divisor = custom;
1530
1531 dbg("Baud %d = %d", baudrate, custom);
1532 return 0;
1533 }
1534
1535 dbg("Baud calculation Failed...");
1536 return -EINVAL;
1537 }
1538
1539 /*
1540 * send_cmd_write_baud_rate
1541 * this function sends the proper command to change the baud rate of the
1542 * specified port.
1543 */
1544 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port,
1545 int baudrate)
1546 {
1547 struct usb_serial_port *port;
1548 struct usb_serial *serial;
1549 int divisor;
1550 int status;
1551 unsigned char number;
1552
1553 if (mos7720_port == NULL)
1554 return -1;
1555
1556 port = mos7720_port->port;
1557 serial = port->serial;
1558
1559 dbg("%s: Entering ..........", __func__);
1560
1561 number = port->number - port->serial->minor;
1562 dbg("%s - port = %d, baud = %d", __func__, port->number, baudrate);
1563
1564 /* Calculate the Divisor */
1565 status = calc_baud_rate_divisor(baudrate, &divisor);
1566 if (status) {
1567 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1568 return status;
1569 }
1570
1571 /* Enable access to divisor latch */
1572 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1573 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR);
1574
1575 /* Write the divisor */
1576 write_mos_reg(serial, number, DLL, (__u8)(divisor & 0xff));
1577 write_mos_reg(serial, number, DLM, (__u8)((divisor & 0xff00) >> 8));
1578
1579 /* Disable access to divisor latch */
1580 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1581 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR);
1582
1583 return status;
1584 }
1585
1586 /*
1587 * change_port_settings
1588 * This routine is called to set the UART on the device to match
1589 * the specified new settings.
1590 */
1591 static void change_port_settings(struct tty_struct *tty,
1592 struct moschip_port *mos7720_port,
1593 struct ktermios *old_termios)
1594 {
1595 struct usb_serial_port *port;
1596 struct usb_serial *serial;
1597 int baud;
1598 unsigned cflag;
1599 unsigned iflag;
1600 __u8 mask = 0xff;
1601 __u8 lData;
1602 __u8 lParity;
1603 __u8 lStop;
1604 int status;
1605 int port_number;
1606
1607 if (mos7720_port == NULL)
1608 return ;
1609
1610 port = mos7720_port->port;
1611 serial = port->serial;
1612 port_number = port->number - port->serial->minor;
1613
1614 dbg("%s - port %d", __func__, port->number);
1615
1616 if (!mos7720_port->open) {
1617 dbg("%s - port not opened", __func__);
1618 return;
1619 }
1620
1621 dbg("%s: Entering ..........", __func__);
1622
1623 lData = UART_LCR_WLEN8;
1624 lStop = 0x00; /* 1 stop bit */
1625 lParity = 0x00; /* No parity */
1626
1627 cflag = tty->termios->c_cflag;
1628 iflag = tty->termios->c_iflag;
1629
1630 /* Change the number of bits */
1631 switch (cflag & CSIZE) {
1632 case CS5:
1633 lData = UART_LCR_WLEN5;
1634 mask = 0x1f;
1635 break;
1636
1637 case CS6:
1638 lData = UART_LCR_WLEN6;
1639 mask = 0x3f;
1640 break;
1641
1642 case CS7:
1643 lData = UART_LCR_WLEN7;
1644 mask = 0x7f;
1645 break;
1646 default:
1647 case CS8:
1648 lData = UART_LCR_WLEN8;
1649 break;
1650 }
1651
1652 /* Change the Parity bit */
1653 if (cflag & PARENB) {
1654 if (cflag & PARODD) {
1655 lParity = UART_LCR_PARITY;
1656 dbg("%s - parity = odd", __func__);
1657 } else {
1658 lParity = (UART_LCR_EPAR | UART_LCR_PARITY);
1659 dbg("%s - parity = even", __func__);
1660 }
1661
1662 } else {
1663 dbg("%s - parity = none", __func__);
1664 }
1665
1666 if (cflag & CMSPAR)
1667 lParity = lParity | 0x20;
1668
1669 /* Change the Stop bit */
1670 if (cflag & CSTOPB) {
1671 lStop = UART_LCR_STOP;
1672 dbg("%s - stop bits = 2", __func__);
1673 } else {
1674 lStop = 0x00;
1675 dbg("%s - stop bits = 1", __func__);
1676 }
1677
1678 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
1679 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
1680 #define LCR_PAR_MASK 0x38 /* Mask for parity field */
1681
1682 /* Update the LCR with the correct value */
1683 mos7720_port->shadowLCR &=
1684 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1685 mos7720_port->shadowLCR |= (lData | lParity | lStop);
1686
1687
1688 /* Disable Interrupts */
1689 write_mos_reg(serial, port_number, IER, 0x00);
1690 write_mos_reg(serial, port_number, FCR, 0x00);
1691 write_mos_reg(serial, port_number, FCR, 0xcf);
1692
1693 /* Send the updated LCR value to the mos7720 */
1694 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1695 mos7720_port->shadowMCR = 0x0b;
1696 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1697
1698 /* set up the MCR register and send it to the mos7720 */
1699 mos7720_port->shadowMCR = UART_MCR_OUT2;
1700 if (cflag & CBAUD)
1701 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS);
1702
1703 if (cflag & CRTSCTS) {
1704 mos7720_port->shadowMCR |= (UART_MCR_XONANY);
1705 /* To set hardware flow control to the specified *
1706 * serial port, in SP1/2_CONTROL_REG */
1707 if (port->number)
1708 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x01);
1709 else
1710 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x02);
1711
1712 } else
1713 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY);
1714
1715 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1716
1717 /* Determine divisor based on baud rate */
1718 baud = tty_get_baud_rate(tty);
1719 if (!baud) {
1720 /* pick a default, any default... */
1721 dbg("Picked default baud...");
1722 baud = 9600;
1723 }
1724
1725 if (baud >= 230400) {
1726 set_higher_rates(mos7720_port, baud);
1727 /* Enable Interrupts */
1728 write_mos_reg(serial, port_number, IER, 0x0c);
1729 return;
1730 }
1731
1732 dbg("%s - baud rate = %d", __func__, baud);
1733 status = send_cmd_write_baud_rate(mos7720_port, baud);
1734 /* FIXME: needs to write actual resulting baud back not just
1735 blindly do so */
1736 if (cflag & CBAUD)
1737 tty_encode_baud_rate(tty, baud, baud);
1738 /* Enable Interrupts */
1739 write_mos_reg(serial, port_number, IER, 0x0c);
1740
1741 if (port->read_urb->status != -EINPROGRESS) {
1742 port->read_urb->dev = serial->dev;
1743
1744 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1745 if (status)
1746 dbg("usb_submit_urb(read bulk) failed, status = %d",
1747 status);
1748 }
1749 return;
1750 }
1751
1752 /*
1753 * mos7720_set_termios
1754 * this function is called by the tty driver when it wants to change the
1755 * termios structure.
1756 */
1757 static void mos7720_set_termios(struct tty_struct *tty,
1758 struct usb_serial_port *port, struct ktermios *old_termios)
1759 {
1760 int status;
1761 unsigned int cflag;
1762 struct usb_serial *serial;
1763 struct moschip_port *mos7720_port;
1764
1765 serial = port->serial;
1766
1767 mos7720_port = usb_get_serial_port_data(port);
1768
1769 if (mos7720_port == NULL)
1770 return;
1771
1772 if (!mos7720_port->open) {
1773 dbg("%s - port not opened", __func__);
1774 return;
1775 }
1776
1777 dbg("%s\n", "setting termios - ASPIRE");
1778
1779 cflag = tty->termios->c_cflag;
1780
1781 dbg("%s - cflag %08x iflag %08x", __func__,
1782 tty->termios->c_cflag,
1783 RELEVANT_IFLAG(tty->termios->c_iflag));
1784
1785 dbg("%s - old cflag %08x old iflag %08x", __func__,
1786 old_termios->c_cflag,
1787 RELEVANT_IFLAG(old_termios->c_iflag));
1788
1789 dbg("%s - port %d", __func__, port->number);
1790
1791 /* change the port settings to the new ones specified */
1792 change_port_settings(tty, mos7720_port, old_termios);
1793
1794 if (!port->read_urb) {
1795 dbg("%s", "URB KILLED !!!!!");
1796 return;
1797 }
1798
1799 if (port->read_urb->status != -EINPROGRESS) {
1800 port->read_urb->dev = serial->dev;
1801 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1802 if (status)
1803 dbg("usb_submit_urb(read bulk) failed, status = %d",
1804 status);
1805 }
1806 return;
1807 }
1808
1809 /*
1810 * get_lsr_info - get line status register info
1811 *
1812 * Purpose: Let user call ioctl() to get info when the UART physically
1813 * is emptied. On bus types like RS485, the transmitter must
1814 * release the bus after transmitting. This must be done when
1815 * the transmit shift register is empty, not be done when the
1816 * transmit holding register is empty. This functionality
1817 * allows an RS485 driver to be written in user space.
1818 */
1819 static int get_lsr_info(struct tty_struct *tty,
1820 struct moschip_port *mos7720_port, unsigned int __user *value)
1821 {
1822 struct usb_serial_port *port = tty->driver_data;
1823 unsigned int result = 0;
1824 unsigned char data = 0;
1825 int port_number = port->number - port->serial->minor;
1826 int count;
1827
1828 count = mos7720_chars_in_buffer(tty);
1829 if (count == 0) {
1830 read_mos_reg(port->serial, port_number, LSR, &data);
1831 if ((data & (UART_LSR_TEMT | UART_LSR_THRE))
1832 == (UART_LSR_TEMT | UART_LSR_THRE)) {
1833 dbg("%s -- Empty", __func__);
1834 result = TIOCSER_TEMT;
1835 }
1836 }
1837 if (copy_to_user(value, &result, sizeof(int)))
1838 return -EFAULT;
1839 return 0;
1840 }
1841
1842 static int mos7720_tiocmget(struct tty_struct *tty, struct file *file)
1843 {
1844 struct usb_serial_port *port = tty->driver_data;
1845 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1846 unsigned int result = 0;
1847 unsigned int mcr ;
1848 unsigned int msr ;
1849
1850 dbg("%s - port %d", __func__, port->number);
1851
1852 mcr = mos7720_port->shadowMCR;
1853 msr = mos7720_port->shadowMSR;
1854
1855 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */
1856 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */
1857 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */
1858 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */
1859 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */
1860 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
1861
1862 dbg("%s -- %x", __func__, result);
1863
1864 return result;
1865 }
1866
1867 static int mos7720_tiocmset(struct tty_struct *tty, struct file *file,
1868 unsigned int set, unsigned int clear)
1869 {
1870 struct usb_serial_port *port = tty->driver_data;
1871 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1872 unsigned int mcr ;
1873 dbg("%s - port %d", __func__, port->number);
1874 dbg("he was at tiocmget");
1875
1876 mcr = mos7720_port->shadowMCR;
1877
1878 if (set & TIOCM_RTS)
1879 mcr |= UART_MCR_RTS;
1880 if (set & TIOCM_DTR)
1881 mcr |= UART_MCR_DTR;
1882 if (set & TIOCM_LOOP)
1883 mcr |= UART_MCR_LOOP;
1884
1885 if (clear & TIOCM_RTS)
1886 mcr &= ~UART_MCR_RTS;
1887 if (clear & TIOCM_DTR)
1888 mcr &= ~UART_MCR_DTR;
1889 if (clear & TIOCM_LOOP)
1890 mcr &= ~UART_MCR_LOOP;
1891
1892 mos7720_port->shadowMCR = mcr;
1893 write_mos_reg(port->serial, port->number - port->serial->minor,
1894 MCR, mos7720_port->shadowMCR);
1895
1896 return 0;
1897 }
1898
1899 static int mos7720_get_icount(struct tty_struct *tty,
1900 struct serial_icounter_struct *icount)
1901 {
1902 struct usb_serial_port *port = tty->driver_data;
1903 struct moschip_port *mos7720_port;
1904 struct async_icount cnow;
1905
1906 mos7720_port = usb_get_serial_port_data(port);
1907 cnow = mos7720_port->icount;
1908
1909 icount->cts = cnow.cts;
1910 icount->dsr = cnow.dsr;
1911 icount->rng = cnow.rng;
1912 icount->dcd = cnow.dcd;
1913 icount->rx = cnow.rx;
1914 icount->tx = cnow.tx;
1915 icount->frame = cnow.frame;
1916 icount->overrun = cnow.overrun;
1917 icount->parity = cnow.parity;
1918 icount->brk = cnow.brk;
1919 icount->buf_overrun = cnow.buf_overrun;
1920
1921 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
1922 port->number, icount->rx, icount->tx);
1923 return 0;
1924 }
1925
1926 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd,
1927 unsigned int __user *value)
1928 {
1929 unsigned int mcr;
1930 unsigned int arg;
1931
1932 struct usb_serial_port *port;
1933
1934 if (mos7720_port == NULL)
1935 return -1;
1936
1937 port = (struct usb_serial_port *)mos7720_port->port;
1938 mcr = mos7720_port->shadowMCR;
1939
1940 if (copy_from_user(&arg, value, sizeof(int)))
1941 return -EFAULT;
1942
1943 switch (cmd) {
1944 case TIOCMBIS:
1945 if (arg & TIOCM_RTS)
1946 mcr |= UART_MCR_RTS;
1947 if (arg & TIOCM_DTR)
1948 mcr |= UART_MCR_RTS;
1949 if (arg & TIOCM_LOOP)
1950 mcr |= UART_MCR_LOOP;
1951 break;
1952
1953 case TIOCMBIC:
1954 if (arg & TIOCM_RTS)
1955 mcr &= ~UART_MCR_RTS;
1956 if (arg & TIOCM_DTR)
1957 mcr &= ~UART_MCR_RTS;
1958 if (arg & TIOCM_LOOP)
1959 mcr &= ~UART_MCR_LOOP;
1960 break;
1961
1962 }
1963
1964 mos7720_port->shadowMCR = mcr;
1965 write_mos_reg(port->serial, port->number - port->serial->minor,
1966 MCR, mos7720_port->shadowMCR);
1967
1968 return 0;
1969 }
1970
1971 static int get_serial_info(struct moschip_port *mos7720_port,
1972 struct serial_struct __user *retinfo)
1973 {
1974 struct serial_struct tmp;
1975
1976 if (!retinfo)
1977 return -EFAULT;
1978
1979 memset(&tmp, 0, sizeof(tmp));
1980
1981 tmp.type = PORT_16550A;
1982 tmp.line = mos7720_port->port->serial->minor;
1983 tmp.port = mos7720_port->port->number;
1984 tmp.irq = 0;
1985 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
1986 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1987 tmp.baud_base = 9600;
1988 tmp.close_delay = 5*HZ;
1989 tmp.closing_wait = 30*HZ;
1990
1991 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1992 return -EFAULT;
1993 return 0;
1994 }
1995
1996 static int mos7720_ioctl(struct tty_struct *tty, struct file *file,
1997 unsigned int cmd, unsigned long arg)
1998 {
1999 struct usb_serial_port *port = tty->driver_data;
2000 struct moschip_port *mos7720_port;
2001 struct async_icount cnow;
2002 struct async_icount cprev;
2003
2004 mos7720_port = usb_get_serial_port_data(port);
2005 if (mos7720_port == NULL)
2006 return -ENODEV;
2007
2008 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2009
2010 switch (cmd) {
2011 case TIOCSERGETLSR:
2012 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2013 return get_lsr_info(tty, mos7720_port,
2014 (unsigned int __user *)arg);
2015 return 0;
2016
2017 /* FIXME: These should be using the mode methods */
2018 case TIOCMBIS:
2019 case TIOCMBIC:
2020 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET",
2021 __func__, port->number);
2022 return set_modem_info(mos7720_port, cmd,
2023 (unsigned int __user *)arg);
2024
2025 case TIOCGSERIAL:
2026 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2027 return get_serial_info(mos7720_port,
2028 (struct serial_struct __user *)arg);
2029
2030 case TIOCMIWAIT:
2031 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2032 cprev = mos7720_port->icount;
2033 while (1) {
2034 if (signal_pending(current))
2035 return -ERESTARTSYS;
2036 cnow = mos7720_port->icount;
2037 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2038 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2039 return -EIO; /* no change => error */
2040 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2041 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2042 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2043 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2044 return 0;
2045 }
2046 cprev = cnow;
2047 }
2048 /* NOTREACHED */
2049 break;
2050 }
2051
2052 return -ENOIOCTLCMD;
2053 }
2054
2055 static int mos7720_startup(struct usb_serial *serial)
2056 {
2057 struct moschip_port *mos7720_port;
2058 struct usb_device *dev;
2059 int i;
2060 char data;
2061 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
2062 int ret_val;
2063
2064 dbg("%s: Entering ..........", __func__);
2065
2066 if (!serial) {
2067 dbg("Invalid Handler");
2068 return -ENODEV;
2069 }
2070
2071 dev = serial->dev;
2072
2073 /*
2074 * The 7715 uses the first bulk in/out endpoint pair for the parallel
2075 * port, and the second for the serial port. Because the usbserial core
2076 * assumes both pairs are serial ports, we must engage in a bit of
2077 * subterfuge and swap the pointers for ports 0 and 1 in order to make
2078 * port 0 point to the serial port. However, both moschip devices use a
2079 * single interrupt-in endpoint for both ports (as mentioned a little
2080 * further down), and this endpoint was assigned to port 0. So after
2081 * the swap, we must copy the interrupt endpoint elements from port 1
2082 * (as newly assigned) to port 0, and null out port 1 pointers.
2083 */
2084 if (product == MOSCHIP_DEVICE_ID_7715) {
2085 struct usb_serial_port *tmp = serial->port[0];
2086 serial->port[0] = serial->port[1];
2087 serial->port[1] = tmp;
2088 serial->port[0]->interrupt_in_urb = tmp->interrupt_in_urb;
2089 serial->port[0]->interrupt_in_buffer = tmp->interrupt_in_buffer;
2090 serial->port[0]->interrupt_in_endpointAddress =
2091 tmp->interrupt_in_endpointAddress;
2092 serial->port[1]->interrupt_in_urb = NULL;
2093 serial->port[1]->interrupt_in_buffer = NULL;
2094 }
2095
2096
2097 /* set up serial port private structures */
2098 for (i = 0; i < serial->num_ports; ++i) {
2099 mos7720_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2100 if (mos7720_port == NULL) {
2101 dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2102 return -ENOMEM;
2103 }
2104
2105 /* Initialize all port interrupt end point to port 0 int
2106 * endpoint. Our device has only one interrupt endpoint
2107 * common to all ports */
2108 serial->port[i]->interrupt_in_endpointAddress =
2109 serial->port[0]->interrupt_in_endpointAddress;
2110
2111 mos7720_port->port = serial->port[i];
2112 usb_set_serial_port_data(serial->port[i], mos7720_port);
2113
2114 dbg("port number is %d", serial->port[i]->number);
2115 dbg("serial number is %d", serial->minor);
2116 }
2117
2118
2119 /* setting configuration feature to one */
2120 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2121 (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5*HZ);
2122
2123 /* start the interrupt urb */
2124 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL);
2125 if (ret_val)
2126 dev_err(&dev->dev,
2127 "%s - Error %d submitting control urb\n",
2128 __func__, ret_val);
2129
2130 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
2131 if (product == MOSCHIP_DEVICE_ID_7715) {
2132 ret_val = mos7715_parport_init(serial);
2133 if (ret_val < 0)
2134 return ret_val;
2135 }
2136 #endif
2137 /* LSR For Port 1 */
2138 read_mos_reg(serial, 0, LSR, &data);
2139 dbg("LSR:%x", data);
2140
2141 return 0;
2142 }
2143
2144 static void mos7720_release(struct usb_serial *serial)
2145 {
2146 int i;
2147
2148 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
2149 /* close the parallel port */
2150
2151 if (le16_to_cpu(serial->dev->descriptor.idProduct)
2152 == MOSCHIP_DEVICE_ID_7715) {
2153 struct urbtracker *urbtrack;
2154 unsigned long flags;
2155 struct mos7715_parport *mos_parport =
2156 usb_get_serial_data(serial);
2157
2158 /* prevent NULL ptr dereference in port callbacks */
2159 spin_lock(&release_lock);
2160 mos_parport->pp->private_data = NULL;
2161 spin_unlock(&release_lock);
2162
2163 /* wait for synchronous usb calls to return */
2164 if (mos_parport->msg_pending)
2165 wait_for_completion_timeout(&mos_parport->syncmsg_compl,
2166 MOS_WDR_TIMEOUT);
2167
2168 parport_remove_port(mos_parport->pp);
2169 usb_set_serial_data(serial, NULL);
2170 mos_parport->serial = NULL;
2171
2172 /* if tasklet currently scheduled, wait for it to complete */
2173 tasklet_kill(&mos_parport->urb_tasklet);
2174
2175 /* unlink any urbs sent by the tasklet */
2176 spin_lock_irqsave(&mos_parport->listlock, flags);
2177 list_for_each_entry(urbtrack,
2178 &mos_parport->active_urbs,
2179 urblist_entry)
2180 usb_unlink_urb(urbtrack->urb);
2181 spin_unlock_irqrestore(&mos_parport->listlock, flags);
2182
2183 kref_put(&mos_parport->ref_count, destroy_mos_parport);
2184 }
2185 #endif
2186 /* free private structure allocated for serial port */
2187 for (i = 0; i < serial->num_ports; ++i)
2188 kfree(usb_get_serial_port_data(serial->port[i]));
2189 }
2190
2191 static struct usb_driver usb_driver = {
2192 .name = "moschip7720",
2193 .probe = usb_serial_probe,
2194 .disconnect = usb_serial_disconnect,
2195 .id_table = moschip_port_id_table,
2196 .no_dynamic_id = 1,
2197 };
2198
2199 static struct usb_serial_driver moschip7720_2port_driver = {
2200 .driver = {
2201 .owner = THIS_MODULE,
2202 .name = "moschip7720",
2203 },
2204 .description = "Moschip 2 port adapter",
2205 .usb_driver = &usb_driver,
2206 .id_table = moschip_port_id_table,
2207 .calc_num_ports = mos77xx_calc_num_ports,
2208 .open = mos7720_open,
2209 .close = mos7720_close,
2210 .throttle = mos7720_throttle,
2211 .unthrottle = mos7720_unthrottle,
2212 .probe = mos77xx_probe,
2213 .attach = mos7720_startup,
2214 .release = mos7720_release,
2215 .ioctl = mos7720_ioctl,
2216 .tiocmget = mos7720_tiocmget,
2217 .tiocmset = mos7720_tiocmset,
2218 .get_icount = mos7720_get_icount,
2219 .set_termios = mos7720_set_termios,
2220 .write = mos7720_write,
2221 .write_room = mos7720_write_room,
2222 .chars_in_buffer = mos7720_chars_in_buffer,
2223 .break_ctl = mos7720_break,
2224 .read_bulk_callback = mos7720_bulk_in_callback,
2225 .read_int_callback = NULL /* dynamically assigned in probe() */
2226 };
2227
2228 static int __init moschip7720_init(void)
2229 {
2230 int retval;
2231
2232 dbg("%s: Entering ..........", __func__);
2233
2234 /* Register with the usb serial */
2235 retval = usb_serial_register(&moschip7720_2port_driver);
2236 if (retval)
2237 goto failed_port_device_register;
2238
2239 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2240 DRIVER_DESC "\n");
2241
2242 /* Register with the usb */
2243 retval = usb_register(&usb_driver);
2244 if (retval)
2245 goto failed_usb_register;
2246
2247 return 0;
2248
2249 failed_usb_register:
2250 usb_serial_deregister(&moschip7720_2port_driver);
2251
2252 failed_port_device_register:
2253 return retval;
2254 }
2255
2256 static void __exit moschip7720_exit(void)
2257 {
2258 usb_deregister(&usb_driver);
2259 usb_serial_deregister(&moschip7720_2port_driver);
2260 }
2261
2262 module_init(moschip7720_init);
2263 module_exit(moschip7720_exit);
2264
2265 /* Module information */
2266 MODULE_AUTHOR(DRIVER_AUTHOR);
2267 MODULE_DESCRIPTION(DRIVER_DESC);
2268 MODULE_LICENSE("GPL");
2269
2270 module_param(debug, bool, S_IRUGO | S_IWUSR);
2271 MODULE_PARM_DESC(debug, "Debug enabled or not");
Linux 2.6 libata-dev (mirror)