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USB: serial/mos*: prevent reading uninitialized stack memory
[net-next-2.6.git] / drivers / usb / serial / mos7720.c
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0f64478c
GKH		 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:
50d2dc72
GKH		 12 * Vijaya Kumar <vijaykumar.gn@gmail.com>
13 * Ajay Kumar <naanuajay@yahoo.com>
14 * Gurudeva <ngurudeva@yahoo.com>
0f64478c
GKH		 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>
4da1a17d 36#include <linux/uaccess.h>
b69578df 37#include <linux/parport.h>
0f64478c
GKH		 38
39/*
40 * Version Information
41 */
63b91767 42#define DRIVER_VERSION "2.1"
0f64478c
GKH		 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
0f64478c
GKH		 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
b69578df 63/* This structure holds all of the local serial port information */
4da1a17d 64struct moschip_port {
0f64478c
GKH		 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
0f64478c
GKH		 74static int debug;
75
fb088e33
MD		 76static struct usb_serial_driver moschip7720_2port_driver;
77
0f64478c
GKH		 78#define USB_VENDOR_ID_MOSCHIP 0x9710
79#define MOSCHIP_DEVICE_ID_7720 0x7720
80#define MOSCHIP_DEVICE_ID_7715 0x7715
81
7d40d7e8 82static const struct usb_device_id moschip_port_id_table[] = {
4da1a17d 83 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7720) },
fb088e33 84 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7715) },
0f64478c
GKH		 85 { } /* terminating entry */
86};
87MODULE_DEVICE_TABLE(usb, moschip_port_id_table);
88
b69578df
MD		 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
95struct urbtracker {
96 struct mos7715_parport *mos_parport;
97 struct list_head urblist_entry;
98 struct kref ref_count;
99 struct urb *urb;
100};
101
102enum 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
108struct 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 */
124static DEFINE_SPINLOCK(release_lock);
125
63b91767
MD		 126#endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
127
128static const unsigned int dummy; /* for clarity in register access fns */
129
b69578df
MD		 130enum 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 */
157static 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 */
63b91767
MD		 188static inline __u16 get_reg_value(enum mos_regs reg,
189 unsigned int serial_portnum)
b69578df
MD		 190{
191 if (reg >= SP1_REG) /* control reg */
192 return 0x0000;
63b91767
MD		 193
194 else if (reg >= DPR) /* parallel port reg (7715 only) */
b69578df 195 return 0x0100;
63b91767
MD		 196
197 else /* serial port reg */
198 return (serial_portnum + 2) << 8;
b69578df
MD		 199}
200
201/*
202 * Write data byte to the specified device register. The data is embedded in
63b91767
MD		 203 * the value field of the setup packet. serial_portnum is ignored for registers
204 * not specific to a particular serial port.
b69578df 205 */
63b91767
MD		 206static int write_mos_reg(struct usb_serial *serial, unsigned int serial_portnum,
207 enum mos_regs reg, __u8 data)
b69578df 208{
b69578df
MD		 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;
b69578df 213 __u16 index = get_reg_index(reg);
63b91767
MD		 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);
b69578df
MD		 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
63b91767
MD		 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.
b69578df 227 */
63b91767
MD		 228static int read_mos_reg(struct usb_serial *serial, unsigned int serial_portnum,
229 enum mos_regs reg, __u8 *data)
b69578df 230{
63b91767 231 struct usb_device *usbdev = serial->dev;
b69578df
MD		 232 unsigned int pipe = usb_rcvctrlpipe(usbdev, 0);
233 __u8 request = (__u8)0x0d;
234 __u8 requesttype = (__u8)0xc0;
b69578df 235 __u16 index = get_reg_index(reg);
63b91767 236 __u16 value = get_reg_value(reg, serial_portnum);
b69578df 237 int status = usb_control_msg(usbdev, pipe, request, requesttype, value,
63b91767 238 index, data, 1, MOS_WDR_TIMEOUT);
b69578df
MD		 239 if (status < 0)
240 dev_err(&usbdev->dev,
241 "mos7720: usb_control_msg() failed: %d", status);
242 return status;
243}
244
63b91767
MD		 245#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
246
b69578df
MD		 247static inline int mos7715_change_mode(struct mos7715_parport *mos_parport,
248 enum mos7715_pp_modes mode)
249{
250 mos_parport->shadowECR = mode;
63b91767 251 write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR);
b69578df
MD		 252 return 0;
253}
254
255static 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
264static 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 */
280static 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 */
334static 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
349static 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;
63b91767 376 setup.wValue = get_reg_value(reg, dummy);
b69578df
MD		 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 */
437static 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 */
468static 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
476static 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);
63b91767 483 write_mos_reg(mos_parport->serial, dummy, DPR, (__u8)d);
b69578df
MD		 484 parport_epilogue(pp);
485}
486
487static 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;
63b91767 494 read_mos_reg(mos_parport->serial, dummy, DPR, &d);
b69578df
MD		 495 parport_epilogue(pp);
496 return d;
497}
498
499static 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);
63b91767 507 write_mos_reg(mos_parport->serial, dummy, DCR, data);
b69578df
MD		 508 mos_parport->shadowDCR = data;
509 parport_epilogue(pp);
510}
511
512static 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
528static 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;
63b91767 540 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
b69578df
MD		 541 dcr = mos_parport->shadowDCR & 0x0f;
542 parport_epilogue(pp);
543 return dcr;
544}
545
546static 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
562static void parport_mos7715_enable_irq(struct parport *pp)
563{
564 dbg("%s called", __func__);
565}
566static void parport_mos7715_disable_irq(struct parport *pp)
567{
568 dbg("%s called", __func__);
569}
570
571static 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;
63b91767 579 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
b69578df
MD		 580 parport_epilogue(pp);
581}
582
583static 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;
63b91767 591 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
b69578df
MD		 592 parport_epilogue(pp);
593}
594
595static 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 */
604static 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 */
621static 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
637static 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
661static 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 */
692static 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 */
63b91767
MD		 714 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x80);
715 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x00);
b69578df
MD		 716
717 /* initialize device registers */
718 mos_parport->shadowDCR = DCR_INIT_VAL;
63b91767 719 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
b69578df 720 mos_parport->shadowECR = ECR_INIT_VAL;
63b91767 721 write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR);
b69578df
MD		 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 */
0f64478c
GKH		 741
742/*
743 * mos7720_interrupt_callback
744 * this is the callback function for when we have received data on the
745 * interrupt endpoint.
746 */
747static void mos7720_interrupt_callback(struct urb *urb)
748{
749 int result;
750 int length;
81105984 751 int status = urb->status;
325b70c2 752 __u8 *data;
0f64478c
GKH		 753 __u8 sp1;
754 __u8 sp2;
0f64478c 755
81105984 756 switch (status) {
0f64478c
GKH		 757 case 0:
758 /* success */
759 break;
760 case -ECONNRESET:
761 case -ENOENT:
762 case -ESHUTDOWN:
763 /* this urb is terminated, clean up */
441b62c1 764 dbg("%s - urb shutting down with status: %d", __func__,
81105984 765 status);
0f64478c
GKH		 766 return;
767 default:
441b62c1 768 dbg("%s - nonzero urb status received: %d", __func__,
81105984 769 status);
0f64478c
GKH		 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 */
325b70c2
ON		 781
782 /* the above description is inverted
783 * oneukum 2007-03-14 */
784
785 if (unlikely(length != 4)) {
0f64478c
GKH		 786 dbg("Wrong data !!!");
787 return;
788 }
789
325b70c2
ON		 790 sp1 = data[3];
791 sp2 = data[2];
0f64478c 792
325b70c2 793 if ((sp1 | sp2) & 0x01) {
0f64478c
GKH		 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:
b69578df 806 /* dbg("Serial Port 1: Modem status change"); */
0f64478c
GKH		 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:
b69578df 819 /* dbg("Serial Port 2: Modem status change"); */
0f64478c
GKH		 820 break;
821 }
822 }
823
824exit:
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",
441b62c1 829 __func__, result);
0f64478c
GKH		 830 return;
831}
832
fb088e33
MD		 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 */
838static 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:
b69578df 853 case -ENODEV:
fb088e33
MD		 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:
b69578df 889 /* dbg("Serial Port: Modem status change"); */
fb088e33
MD		 890 break;
891 }
892 }
893
b69578df
MD		 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
fb088e33
MD		 904exit:
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
0f64478c
GKH		 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 */
918static void mos7720_bulk_in_callback(struct urb *urb)
919{
81105984 920 int retval;
0f64478c
GKH		 921 unsigned char *data ;
922 struct usb_serial_port *port;
0f64478c 923 struct tty_struct *tty;
81105984 924 int status = urb->status;
0f64478c 925
81105984
GKH		 926 if (status) {
927 dbg("nonzero read bulk status received: %d", status);
0f64478c
GKH		 928 return;
929 }
930
b69578df 931 port = urb->context;
0f64478c 932
441b62c1 933 dbg("Entering...%s", __func__);
0f64478c
GKH		 934
935 data = urb->transfer_buffer;
936
4a90f09b 937 tty = tty_port_tty_get(&port->port);
0f64478c 938 if (tty && urb->actual_length) {
0f64478c
GKH		 939 tty_insert_flip_string(tty, data, urb->actual_length);
940 tty_flip_buffer_push(tty);
941 }
4a90f09b 942 tty_kref_put(tty);
0f64478c
GKH		 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
81105984
GKH		 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);
0f64478c
GKH		 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 */
964static void mos7720_bulk_out_data_callback(struct urb *urb)
965{
966 struct moschip_port *mos7720_port;
967 struct tty_struct *tty;
81105984 968 int status = urb->status;
0f64478c 969
81105984
GKH		 970 if (status) {
971 dbg("nonzero write bulk status received:%d", status);
0f64478c
GKH		 972 return;
973 }
974
975 mos7720_port = urb->context;
976 if (!mos7720_port) {
977 dbg("NULL mos7720_port pointer");
978 return ;
979 }
980
4a90f09b 981 tty = tty_port_tty_get(&mos7720_port->port->port);
0f64478c 982
b963a844
JS		 983 if (tty && mos7720_port->open)
984 tty_wakeup(tty);
4a90f09b 985 tty_kref_put(tty);
0f64478c
GKH		 986}
987
fb088e33
MD		 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 */
994static 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
1007static 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
a509a7e4 1016static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port)
0f64478c
GKH		 1017{
1018 struct usb_serial *serial;
1019 struct usb_serial_port *port0;
1020 struct urb *urb;
0f64478c
GKH		 1021 struct moschip_port *mos7720_port;
1022 int response;
1023 int port_number;
63b91767 1024 __u8 data;
fe4b65ec 1025 int allocated_urbs = 0;
0f64478c
GKH		 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
0f64478c
GKH		 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) {
4da1a17d 1041 urb = usb_alloc_urb(0, GFP_KERNEL);
0f64478c
GKH		 1042 mos7720_port->write_urb_pool[j] = urb;
1043
1044 if (urb == NULL) {
194343d9 1045 dev_err(&port->dev, "No more urbs???\n");
0f64478c
GKH		 1046 continue;
1047 }
1048
1049 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1050 GFP_KERNEL);
1051 if (!urb->transfer_buffer) {
194343d9
GKH		 1052 dev_err(&port->dev,
1053 "%s-out of memory for urb buffers.\n",
1054 __func__);
fe4b65ec
ON		 1055 usb_free_urb(mos7720_port->write_urb_pool[j]);
1056 mos7720_port->write_urb_pool[j] = NULL;
0f64478c
GKH		 1057 continue;
1058 }
fe4b65ec 1059 allocated_urbs++;
0f64478c
GKH		 1060 }
1061
fe4b65ec
ON		 1062 if (!allocated_urbs)
1063 return -ENOMEM;
1064
0f64478c
GKH		 1065 /* Initialize MCS7720 -- Write Init values to corresponding Registers
1066 *
1067 * Register Index
2f9ea55c 1068 * 0 : THR/RHR
0f64478c
GKH		 1069 * 1 : IER
1070 * 2 : FCR
1071 * 3 : LCR
1072 * 4 : MCR
2f9ea55c
KS		 1073 * 5 : LSR
1074 * 6 : MSR
1075 * 7 : SPR
0f64478c
GKH		 1076 *
1077 * 0x08 : SP1/2 Control Reg
1078 */
1079 port_number = port->number - port->serial->minor;
63b91767
MD		 1080 read_mos_reg(serial, port_number, LSR, &data);
1081
759f3634 1082 dbg("SS::%p LSR:%x", mos7720_port, data);
0f64478c
GKH		 1083
1084 dbg("Check:Sending Command ..........");
1085
63b91767
MD		 1086 write_mos_reg(serial, dummy, SP1_REG, 0x02);
1087 write_mos_reg(serial, dummy, SP2_REG, 0x02);
0f64478c 1088
63b91767
MD		 1089 write_mos_reg(serial, port_number, IER, 0x00);
1090 write_mos_reg(serial, port_number, FCR, 0x00);
0f64478c 1091
63b91767
MD		 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);
0f64478c 1097
63b91767
MD		 1098 write_mos_reg(serial, port_number, SP_CONTROL_REG, 0x00);
1099 read_mos_reg(serial, dummy, SP_CONTROL_REG, &data);
0f64478c 1100 data = data | (port->number - port->serial->minor + 1);
63b91767
MD		 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);
0f64478c 1109
0f64478c
GKH		 1110 response = usb_submit_urb(port->read_urb, GFP_KERNEL);
1111 if (response)
4da1a17d
AC		 1112 dev_err(&port->dev, "%s - Error %d submitting read urb\n",
1113 __func__, response);
0f64478c
GKH		 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 */
95da310e 1136static int mos7720_chars_in_buffer(struct tty_struct *tty)
0f64478c 1137{
95da310e 1138 struct usb_serial_port *port = tty->driver_data;
0f64478c
GKH		 1139 int i;
1140 int chars = 0;
1141 struct moschip_port *mos7720_port;
1142
441b62c1 1143 dbg("%s:entering ...........", __func__);
0f64478c
GKH		 1144
1145 mos7720_port = usb_get_serial_port_data(port);
1146 if (mos7720_port == NULL) {
441b62c1 1147 dbg("%s:leaving ...........", __func__);
23198fda 1148 return 0;
0f64478c
GKH		 1149 }
1150
1151 for (i = 0; i < NUM_URBS; ++i) {
4da1a17d
AC		 1152 if (mos7720_port->write_urb_pool[i] &&
1153 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS)
0f64478c
GKH		 1154 chars += URB_TRANSFER_BUFFER_SIZE;
1155 }
441b62c1 1156 dbg("%s - returns %d", __func__, chars);
0f64478c
GKH		 1157 return chars;
1158}
1159
335f8514 1160static void mos7720_close(struct usb_serial_port *port)
0f64478c
GKH		 1161{
1162 struct usb_serial *serial;
1163 struct moschip_port *mos7720_port;
0f64478c
GKH		 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 *
a1cd7e99
ON		 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) {
63b91767
MD		 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);
0f64478c 1200 }
a1cd7e99 1201 mutex_unlock(&serial->disc_mutex);
0f64478c
GKH		 1202 mos7720_port->open = 0;
1203
441b62c1 1204 dbg("Leaving %s", __func__);
0f64478c
GKH		 1205}
1206
95da310e 1207static void mos7720_break(struct tty_struct *tty, int break_state)
0f64478c 1208{
95da310e 1209 struct usb_serial_port *port = tty->driver_data;
4da1a17d 1210 unsigned char data;
0f64478c
GKH		 1211 struct usb_serial *serial;
1212 struct moschip_port *mos7720_port;
1213
441b62c1 1214 dbg("Entering %s", __func__);
0f64478c
GKH		 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;
63b91767
MD		 1228 write_mos_reg(serial, port->number - port->serial->minor,
1229 LCR, mos7720_port->shadowLCR);
0f64478c
GKH		 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 */
95da310e 1241static int mos7720_write_room(struct tty_struct *tty)
0f64478c 1242{
95da310e 1243 struct usb_serial_port *port = tty->driver_data;
0f64478c
GKH		 1244 struct moschip_port *mos7720_port;
1245 int room = 0;
1246 int i;
1247
441b62c1 1248 dbg("%s:entering ...........", __func__);
0f64478c
GKH		 1249
1250 mos7720_port = usb_get_serial_port_data(port);
1251 if (mos7720_port == NULL) {
441b62c1 1252 dbg("%s:leaving ...........", __func__);
0f64478c
GKH		 1253 return -ENODEV;
1254 }
1255
a5b6f60c 1256 /* FIXME: Locking */
0f64478c 1257 for (i = 0; i < NUM_URBS; ++i) {
4da1a17d
AC		 1258 if (mos7720_port->write_urb_pool[i] &&
1259 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS)
0f64478c
GKH		 1260 room += URB_TRANSFER_BUFFER_SIZE;
1261 }
1262
441b62c1 1263 dbg("%s - returns %d", __func__, room);
0f64478c
GKH		 1264 return room;
1265}
1266
95da310e
AC		 1267static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port,
1268 const unsigned char *data, int count)
0f64478c
GKH		 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
441b62c1 1280 dbg("%s:entering ...........", __func__);
0f64478c
GKH		 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) {
4da1a17d
AC		 1294 if (mos7720_port->write_urb_pool[i] &&
1295 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) {
0f64478c 1296 urb = mos7720_port->write_urb_pool[i];
4da1a17d 1297 dbg("URB:%d", i);
0f64478c
GKH		 1298 break;
1299 }
1300 }
1301
1302 if (urb == NULL) {
441b62c1 1303 dbg("%s - no more free urbs", __func__);
0f64478c
GKH		 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) {
194343d9
GKH		 1311 dev_err(&port->dev, "%s no more kernel memory...\n",
1312 __func__);
0f64478c
GKH		 1313 goto exit;
1314 }
1315 }
4da1a17d 1316 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
0f64478c
GKH		 1317
1318 memcpy(urb->transfer_buffer, current_position, transfer_size);
441b62c1 1319 usb_serial_debug_data(debug, &port->dev, __func__, transfer_size,
0f64478c
GKH		 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,
4da1a17d 1325 port->bulk_out_endpointAddress),
0f64478c
GKH		 1326 urb->transfer_buffer, transfer_size,
1327 mos7720_bulk_out_data_callback, mos7720_port);
1328
1329 /* send it down the pipe */
4da1a17d 1330 status = usb_submit_urb(urb, GFP_ATOMIC);
0f64478c 1331 if (status) {
194343d9
GKH		 1332 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1333 "with status = %d\n", __func__, status);
0f64478c
GKH		 1334 bytes_sent = status;
1335 goto exit;
1336 }
1337 bytes_sent = transfer_size;
1338
1339exit:
1340 return bytes_sent;
1341}
1342
95da310e 1343static void mos7720_throttle(struct tty_struct *tty)
0f64478c 1344{
95da310e 1345 struct usb_serial_port *port = tty->driver_data;
0f64478c 1346 struct moschip_port *mos7720_port;
0f64478c
GKH		 1347 int status;
1348
759f3634 1349 dbg("%s- port %d", __func__, port->number);
0f64478c
GKH		 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
441b62c1 1361 dbg("%s: Entering ..........", __func__);
0f64478c 1362
0f64478c
GKH		 1363 /* if we are implementing XON/XOFF, send the stop character */
1364 if (I_IXOFF(tty)) {
1365 unsigned char stop_char = STOP_CHAR(tty);
95da310e 1366 status = mos7720_write(tty, port, &stop_char, 1);
0f64478c
GKH		 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;
63b91767
MD		 1374 write_mos_reg(port->serial, port->number - port->serial->minor,
1375 MCR, mos7720_port->shadowMCR);
0f64478c
GKH		 1376 if (status != 0)
1377 return;
1378 }
1379}
1380
95da310e 1381static void mos7720_unthrottle(struct tty_struct *tty)
0f64478c 1382{
95da310e 1383 struct usb_serial_port *port = tty->driver_data;
0f64478c 1384 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
95da310e 1385 int status;
0f64478c
GKH		 1386
1387 if (mos7720_port == NULL)
1388 return;
1389
1390 if (!mos7720_port->open) {
441b62c1 1391 dbg("%s - port not opened", __func__);
0f64478c
GKH		 1392 return;
1393 }
1394
441b62c1 1395 dbg("%s: Entering ..........", __func__);
0f64478c 1396
0f64478c
GKH		 1397 /* if we are implementing XON/XOFF, send the start character */
1398 if (I_IXOFF(tty)) {
1399 unsigned char start_char = START_CHAR(tty);
95da310e 1400 status = mos7720_write(tty, port, &start_char, 1);
0f64478c
GKH		 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;
63b91767
MD		 1408 write_mos_reg(port->serial, port->number - port->serial->minor,
1409 MCR, mos7720_port->shadowMCR);
0f64478c
GKH		 1410 if (status != 0)
1411 return;
1412 }
1413}
1414
b69578df 1415/* FIXME: this function does not work */
0f64478c
GKH		 1416static int set_higher_rates(struct moschip_port *mos7720_port,
1417 unsigned int baud)
1418{
0f64478c
GKH		 1419 struct usb_serial_port *port;
1420 struct usb_serial *serial;
1421 int port_number;
63b91767 1422 enum mos_regs sp_reg;
0f64478c
GKH		 1423 if (mos7720_port == NULL)
1424 return -EINVAL;
1425
1426 port = mos7720_port->port;
1427 serial = port->serial;
1428
4da1a17d
AC		 1429 /***********************************************
1430 * Init Sequence for higher rates
1431 ***********************************************/
0f64478c
GKH		 1432 dbg("Sending Setting Commands ..........");
1433 port_number = port->number - port->serial->minor;
1434
63b91767
MD		 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);
0f64478c 1441
4da1a17d
AC		 1442 /***********************************************
1443 * Set for higher rates *
1444 ***********************************************/
b69578df 1445 /* writing baud rate verbatum into uart clock field clearly not right */
63b91767
MD		 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);
0f64478c 1454
4da1a17d
AC		 1455 /***********************************************
1456 * Set DLL/DLM
1457 ***********************************************/
63b91767
MD		 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);
0f64478c
GKH		 1464
1465 return 0;
1466}
1467
1468/* baud rate information */
4da1a17d 1469struct divisor_table_entry {
0f64478c
GKH		 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. */
1477static 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 *****************************************************************************/
1501static int calc_baud_rate_divisor(int baudrate, int *divisor)
1502{
1503 int i;
1504 __u16 custom;
1505 __u16 round1;
1506 __u16 round;
1507
1508
441b62c1 1509 dbg("%s - %d", __func__, baudrate);
0f64478c
GKH		 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
4da1a17d
AC		 1518 /* After trying for all the standard baud rates *
1519 * Try calculating the divisor for this baud rate */
0f64478c
GKH		 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
4da1a17d 1531 dbg("Baud %d = %d", baudrate, custom);
0f64478c
GKH		 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 */
1544static 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;
0f64478c
GKH		 1551 unsigned char number;
1552
1553 if (mos7720_port == NULL)
1554 return -1;
1555
1556 port = mos7720_port->port;
1557 serial = port->serial;
1558
441b62c1 1559 dbg("%s: Entering ..........", __func__);
0f64478c
GKH		 1560
1561 number = port->number - port->serial->minor;
441b62c1 1562 dbg("%s - port = %d, baud = %d", __func__, port->number, baudrate);
0f64478c 1563
4da1a17d 1564 /* Calculate the Divisor */
0f64478c
GKH		 1565 status = calc_baud_rate_divisor(baudrate, &divisor);
1566 if (status) {
194343d9 1567 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
0f64478c
GKH		 1568 return status;
1569 }
1570
4da1a17d 1571 /* Enable access to divisor latch */
63b91767
MD		 1572 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1573 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR);
0f64478c
GKH		 1574
1575 /* Write the divisor */
63b91767
MD		 1576 write_mos_reg(serial, number, DLL, (__u8)(divisor & 0xff));
1577 write_mos_reg(serial, number, DLM, (__u8)((divisor & 0xff00) >> 8));
0f64478c 1578
4da1a17d 1579 /* Disable access to divisor latch */
63b91767
MD		 1580 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1581 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR);
0f64478c
GKH		 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 */
95da310e
AC		 1591static void change_port_settings(struct tty_struct *tty,
1592 struct moschip_port *mos7720_port,
606d099c 1593 struct ktermios *old_termios)
0f64478c
GKH		 1594{
1595 struct usb_serial_port *port;
1596 struct usb_serial *serial;
0f64478c
GKH		 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;
0f64478c
GKH		 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
441b62c1 1614 dbg("%s - port %d", __func__, port->number);
0f64478c
GKH		 1615
1616 if (!mos7720_port->open) {
441b62c1 1617 dbg("%s - port not opened", __func__);
0f64478c
GKH		 1618 return;
1619 }
1620
441b62c1 1621 dbg("%s: Entering ..........", __func__);
0f64478c
GKH		 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;
441b62c1 1656 dbg("%s - parity = odd", __func__);
0f64478c
GKH		 1657 } else {
1658 lParity = (UART_LCR_EPAR | UART_LCR_PARITY);
441b62c1 1659 dbg("%s - parity = even", __func__);
0f64478c
GKH		 1660 }
1661
1662 } else {
441b62c1 1663 dbg("%s - parity = none", __func__);
0f64478c
GKH		 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;
441b62c1 1672 dbg("%s - stop bits = 2", __func__);
0f64478c
GKH		 1673 } else {
1674 lStop = 0x00;
441b62c1 1675 dbg("%s - stop bits = 1", __func__);
0f64478c
GKH		 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 */
4da1a17d 1683 mos7720_port->shadowLCR &=
63b91767 1684 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
0f64478c
GKH		 1685 mos7720_port->shadowLCR |= (lData | lParity | lStop);
1686
1687
1688 /* Disable Interrupts */
63b91767
MD		 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);
0f64478c
GKH		 1692
1693 /* Send the updated LCR value to the mos7720 */
63b91767
MD		 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);
0f64478c
GKH		 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);
4da1a17d
AC		 1705 /* To set hardware flow control to the specified *
1706 * serial port, in SP1/2_CONTROL_REG */
63b91767
MD		 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
0f64478c 1713 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY);
0f64478c 1714
63b91767 1715 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
0f64478c
GKH		 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 */
63b91767 1728 write_mos_reg(serial, port_number, IER, 0x0c);
0f64478c
GKH		 1729 return;
1730 }
1731
441b62c1 1732 dbg("%s - baud rate = %d", __func__, baud);
0f64478c 1733 status = send_cmd_write_baud_rate(mos7720_port, baud);
65d063ab
AC		 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);
0f64478c 1738 /* Enable Interrupts */
63b91767 1739 write_mos_reg(serial, port_number, IER, 0x0c);
0f64478c
GKH		 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 */
95da310e
AC		 1757static void mos7720_set_termios(struct tty_struct *tty,
1758 struct usb_serial_port *port, struct ktermios *old_termios)
0f64478c
GKH		 1759{
1760 int status;
1761 unsigned int cflag;
1762 struct usb_serial *serial;
1763 struct moschip_port *mos7720_port;
0f64478c
GKH		 1764
1765 serial = port->serial;
1766
1767 mos7720_port = usb_get_serial_port_data(port);
1768
1769 if (mos7720_port == NULL)
1770 return;
1771
0f64478c 1772 if (!mos7720_port->open) {
441b62c1 1773 dbg("%s - port not opened", __func__);
0f64478c
GKH		 1774 return;
1775 }
1776
b69578df 1777 dbg("%s\n", "setting termios - ASPIRE");
0f64478c
GKH		 1778
1779 cflag = tty->termios->c_cflag;
1780
441b62c1 1781 dbg("%s - cflag %08x iflag %08x", __func__,
0f64478c
GKH		 1782 tty->termios->c_cflag,
1783 RELEVANT_IFLAG(tty->termios->c_iflag));
1784
441b62c1 1785 dbg("%s - old cflag %08x old iflag %08x", __func__,
65d063ab
AC		 1786 old_termios->c_cflag,
1787 RELEVANT_IFLAG(old_termios->c_iflag));
0f64478c 1788
441b62c1 1789 dbg("%s - port %d", __func__, port->number);
0f64478c
GKH		 1790
1791 /* change the port settings to the new ones specified */
95da310e 1792 change_port_settings(tty, mos7720_port, old_termios);
0f64478c 1793
4da1a17d 1794 if (!port->read_urb) {
b69578df 1795 dbg("%s", "URB KILLED !!!!!");
0f64478c
GKH		 1796 return;
1797 }
1798
4da1a17d 1799 if (port->read_urb->status != -EINPROGRESS) {
0f64478c
GKH		 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 */
4da1a17d
AC		 1819static int get_lsr_info(struct tty_struct *tty,
1820 struct moschip_port *mos7720_port, unsigned int __user *value)
0f64478c 1821{
2f9ea55c 1822 struct usb_serial_port *port = tty->driver_data;
0f64478c 1823 unsigned int result = 0;
2f9ea55c
KS		 1824 unsigned char data = 0;
1825 int port_number = port->number - port->serial->minor;
1826 int count;
0f64478c 1827
95da310e 1828 count = mos7720_chars_in_buffer(tty);
0f64478c 1829 if (count == 0) {
63b91767 1830 read_mos_reg(port->serial, port_number, LSR, &data);
2f9ea55c
KS		 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 }
0f64478c 1836 }
0f64478c
GKH		 1837 if (copy_to_user(value, &result, sizeof(int)))
1838 return -EFAULT;
1839 return 0;
1840}
1841
0f608f89
KS		 1842static 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
1867static int mos7720_tiocmset(struct tty_struct *tty, struct file *file,
63b91767 1868 unsigned int set, unsigned int clear)
0f608f89
KS		 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 ;
0f608f89
KS		 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;
63b91767
MD		 1893 write_mos_reg(port->serial, port->number - port->serial->minor,
1894 MCR, mos7720_port->shadowMCR);
0f608f89
KS		 1895
1896 return 0;
1897}
1898
0f64478c
GKH		 1899static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd,
1900 unsigned int __user *value)
1901{
1902 unsigned int mcr ;
1903 unsigned int arg;
0f64478c
GKH		 1904
1905 struct usb_serial_port *port;
1906
1907 if (mos7720_port == NULL)
1908 return -1;
1909
4da1a17d 1910 port = (struct usb_serial_port *)mos7720_port->port;
0f64478c
GKH		 1911 mcr = mos7720_port->shadowMCR;
1912
1913 if (copy_from_user(&arg, value, sizeof(int)))
1914 return -EFAULT;
1915
1916 switch (cmd) {
1917 case TIOCMBIS:
1918 if (arg & TIOCM_RTS)
1919 mcr |= UART_MCR_RTS;
1920 if (arg & TIOCM_DTR)
1921 mcr |= UART_MCR_RTS;
1922 if (arg & TIOCM_LOOP)
1923 mcr |= UART_MCR_LOOP;
1924 break;
1925
1926 case TIOCMBIC:
1927 if (arg & TIOCM_RTS)
1928 mcr &= ~UART_MCR_RTS;
1929 if (arg & TIOCM_DTR)
1930 mcr &= ~UART_MCR_RTS;
1931 if (arg & TIOCM_LOOP)
1932 mcr &= ~UART_MCR_LOOP;
1933 break;
1934
0f64478c
GKH		 1935 }
1936
1937 mos7720_port->shadowMCR = mcr;
63b91767
MD		 1938 write_mos_reg(port->serial, port->number - port->serial->minor,
1939 MCR, mos7720_port->shadowMCR);
0f64478c
GKH		 1940
1941 return 0;
1942}
1943
0f64478c
GKH		 1944static int get_serial_info(struct moschip_port *mos7720_port,
1945 struct serial_struct __user *retinfo)
1946{
1947 struct serial_struct tmp;
1948
1949 if (!retinfo)
1950 return -EFAULT;
1951
1952 memset(&tmp, 0, sizeof(tmp));
1953
1954 tmp.type = PORT_16550A;
1955 tmp.line = mos7720_port->port->serial->minor;
1956 tmp.port = mos7720_port->port->number;
1957 tmp.irq = 0;
1958 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
4da1a17d 1959 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
0f64478c
GKH		 1960 tmp.baud_base = 9600;
1961 tmp.close_delay = 5*HZ;
1962 tmp.closing_wait = 30*HZ;
1963
1964 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1965 return -EFAULT;
1966 return 0;
1967}
1968
95da310e 1969static int mos7720_ioctl(struct tty_struct *tty, struct file *file,
0f64478c
GKH		 1970 unsigned int cmd, unsigned long arg)
1971{
95da310e 1972 struct usb_serial_port *port = tty->driver_data;
0f64478c
GKH		 1973 struct moschip_port *mos7720_port;
1974 struct async_icount cnow;
1975 struct async_icount cprev;
1976 struct serial_icounter_struct icount;
1977
1978 mos7720_port = usb_get_serial_port_data(port);
1979 if (mos7720_port == NULL)
1980 return -ENODEV;
1981
441b62c1 1982 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
0f64478c
GKH		 1983
1984 switch (cmd) {
0f64478c 1985 case TIOCSERGETLSR:
441b62c1 1986 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
4da1a17d
AC		 1987 return get_lsr_info(tty, mos7720_port,
1988 (unsigned int __user *)arg);
0f64478c
GKH		 1989 return 0;
1990
95da310e 1991 /* FIXME: These should be using the mode methods */
0f64478c
GKH		 1992 case TIOCMBIS:
1993 case TIOCMBIC:
4da1a17d
AC		 1994 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET",
1995 __func__, port->number);
0f64478c
GKH		 1996 return set_modem_info(mos7720_port, cmd,
1997 (unsigned int __user *)arg);
1998
0f64478c 1999 case TIOCGSERIAL:
441b62c1 2000 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
0f64478c
GKH		 2001 return get_serial_info(mos7720_port,
2002 (struct serial_struct __user *)arg);
2003
0f64478c 2004 case TIOCMIWAIT:
441b62c1 2005 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
0f64478c
GKH		 2006 cprev = mos7720_port->icount;
2007 while (1) {
2008 if (signal_pending(current))
2009 return -ERESTARTSYS;
2010 cnow = mos7720_port->icount;
2011 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2012 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2013 return -EIO; /* no change => error */
2014 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2015 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2016 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
4da1a17d 2017 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
0f64478c
GKH		 2018 return 0;
2019 }
2020 cprev = cnow;
2021 }
2022 /* NOTREACHED */
2023 break;
2024
2025 case TIOCGICOUNT:
2026 cnow = mos7720_port->icount;
a0846f18
DR		 2027
2028 memset(&icount, 0, sizeof(struct serial_icounter_struct));
2029
0f64478c
GKH		 2030 icount.cts = cnow.cts;
2031 icount.dsr = cnow.dsr;
2032 icount.rng = cnow.rng;
2033 icount.dcd = cnow.dcd;
2034 icount.rx = cnow.rx;
2035 icount.tx = cnow.tx;
2036 icount.frame = cnow.frame;
2037 icount.overrun = cnow.overrun;
2038 icount.parity = cnow.parity;
2039 icount.brk = cnow.brk;
2040 icount.buf_overrun = cnow.buf_overrun;
2041
441b62c1 2042 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
4da1a17d 2043 port->number, icount.rx, icount.tx);
0f64478c
GKH		 2044 if (copy_to_user((void __user *)arg, &icount, sizeof(icount)))
2045 return -EFAULT;
2046 return 0;
2047 }
2048
2049 return -ENOIOCTLCMD;
2050}
2051
2052static int mos7720_startup(struct usb_serial *serial)
2053{
0f64478c
GKH		 2054 struct moschip_port *mos7720_port;
2055 struct usb_device *dev;
2056 int i;
2057 char data;
fb088e33 2058 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
b69578df 2059 int ret_val;
0f64478c 2060
441b62c1 2061 dbg("%s: Entering ..........", __func__);
0f64478c
GKH		 2062
2063 if (!serial) {
2064 dbg("Invalid Handler");
2065 return -ENODEV;
2066 }
2067
2068 dev = serial->dev;
2069
fb088e33
MD		 2070 /*
2071 * The 7715 uses the first bulk in/out endpoint pair for the parallel
2072 * port, and the second for the serial port. Because the usbserial core
2073 * assumes both pairs are serial ports, we must engage in a bit of
2074 * subterfuge and swap the pointers for ports 0 and 1 in order to make
2075 * port 0 point to the serial port. However, both moschip devices use a
2076 * single interrupt-in endpoint for both ports (as mentioned a little
2077 * further down), and this endpoint was assigned to port 0. So after
2078 * the swap, we must copy the interrupt endpoint elements from port 1
2079 * (as newly assigned) to port 0, and null out port 1 pointers.
2080 */
2081 if (product == MOSCHIP_DEVICE_ID_7715) {
2082 struct usb_serial_port *tmp = serial->port[0];
2083 serial->port[0] = serial->port[1];
2084 serial->port[1] = tmp;
2085 serial->port[0]->interrupt_in_urb = tmp->interrupt_in_urb;
2086 serial->port[0]->interrupt_in_buffer = tmp->interrupt_in_buffer;
2087 serial->port[0]->interrupt_in_endpointAddress =
2088 tmp->interrupt_in_endpointAddress;
2089 serial->port[1]->interrupt_in_urb = NULL;
2090 serial->port[1]->interrupt_in_buffer = NULL;
2091 }
2092
0f64478c 2093
b69578df 2094 /* set up serial port private structures */
0f64478c
GKH		 2095 for (i = 0; i < serial->num_ports; ++i) {
2096 mos7720_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2097 if (mos7720_port == NULL) {
194343d9 2098 dev_err(&dev->dev, "%s - Out of memory\n", __func__);
0f64478c
GKH		 2099 return -ENOMEM;
2100 }
2101
2102 /* Initialize all port interrupt end point to port 0 int
2103 * endpoint. Our device has only one interrupt endpoint
fb088e33 2104 * common to all ports */
4da1a17d
AC		 2105 serial->port[i]->interrupt_in_endpointAddress =
2106 serial->port[0]->interrupt_in_endpointAddress;
0f64478c
GKH		 2107
2108 mos7720_port->port = serial->port[i];
2109 usb_set_serial_port_data(serial->port[i], mos7720_port);
2110
2111 dbg("port number is %d", serial->port[i]->number);
2112 dbg("serial number is %d", serial->minor);
2113 }
2114
2115
2116 /* setting configuration feature to one */
2117 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
4da1a17d 2118 (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5*HZ);
0f64478c 2119
b69578df
MD		 2120 /* start the interrupt urb */
2121 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL);
2122 if (ret_val)
2123 dev_err(&dev->dev,
2124 "%s - Error %d submitting control urb\n",
2125 __func__, ret_val);
2126
2127#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
2128 if (product == MOSCHIP_DEVICE_ID_7715) {
2129 ret_val = mos7715_parport_init(serial);
2130 if (ret_val < 0)
2131 return ret_val;
2132 }
2133#endif
4da1a17d 2134 /* LSR For Port 1 */
63b91767 2135 read_mos_reg(serial, 0, LSR, &data);
4da1a17d 2136 dbg("LSR:%x", data);
0f64478c
GKH		 2137
2138 return 0;
2139}
2140
f9c99bb8 2141static void mos7720_release(struct usb_serial *serial)
0f64478c
GKH		 2142{
2143 int i;
2144
b69578df
MD		 2145#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
2146 /* close the parallel port */
2147
2148 if (le16_to_cpu(serial->dev->descriptor.idProduct)
2149 == MOSCHIP_DEVICE_ID_7715) {
2150 struct urbtracker *urbtrack;
2151 unsigned long flags;
2152 struct mos7715_parport *mos_parport =
2153 usb_get_serial_data(serial);
2154
2155 /* prevent NULL ptr dereference in port callbacks */
2156 spin_lock(&release_lock);
2157 mos_parport->pp->private_data = NULL;
2158 spin_unlock(&release_lock);
2159
2160 /* wait for synchronous usb calls to return */
2161 if (mos_parport->msg_pending)
2162 wait_for_completion_timeout(&mos_parport->syncmsg_compl,
2163 MOS_WDR_TIMEOUT);
2164
2165 parport_remove_port(mos_parport->pp);
2166 usb_set_serial_data(serial, NULL);
2167 mos_parport->serial = NULL;
2168
2169 /* if tasklet currently scheduled, wait for it to complete */
2170 tasklet_kill(&mos_parport->urb_tasklet);
2171
2172 /* unlink any urbs sent by the tasklet */
2173 spin_lock_irqsave(&mos_parport->listlock, flags);
2174 list_for_each_entry(urbtrack,
2175 &mos_parport->active_urbs,
2176 urblist_entry)
2177 usb_unlink_urb(urbtrack->urb);
2178 spin_unlock_irqrestore(&mos_parport->listlock, flags);
2179
2180 kref_put(&mos_parport->ref_count, destroy_mos_parport);
2181 }
2182#endif
0f64478c 2183 /* free private structure allocated for serial port */
f9c99bb8 2184 for (i = 0; i < serial->num_ports; ++i)
0f64478c 2185 kfree(usb_get_serial_port_data(serial->port[i]));
0f64478c
GKH		 2186}
2187
d9b1b787
JH		 2188static struct usb_driver usb_driver = {
2189 .name = "moschip7720",
2190 .probe = usb_serial_probe,
2191 .disconnect = usb_serial_disconnect,
2192 .id_table = moschip_port_id_table,
2193 .no_dynamic_id = 1,
2194};
2195
0f64478c
GKH		 2196static struct usb_serial_driver moschip7720_2port_driver = {
2197 .driver = {
2198 .owner = THIS_MODULE,
2199 .name = "moschip7720",
2200 },
2201 .description = "Moschip 2 port adapter",
d9b1b787 2202 .usb_driver = &usb_driver,
0f64478c 2203 .id_table = moschip_port_id_table,
fb088e33 2204 .calc_num_ports = mos77xx_calc_num_ports,
0f64478c
GKH		 2205 .open = mos7720_open,
2206 .close = mos7720_close,
2207 .throttle = mos7720_throttle,
2208 .unthrottle = mos7720_unthrottle,
fb088e33 2209 .probe = mos77xx_probe,
0f64478c 2210 .attach = mos7720_startup,
f9c99bb8 2211 .release = mos7720_release,
0f64478c 2212 .ioctl = mos7720_ioctl,
0f608f89
KS		 2213 .tiocmget = mos7720_tiocmget,
2214 .tiocmset = mos7720_tiocmset,
0f64478c
GKH		 2215 .set_termios = mos7720_set_termios,
2216 .write = mos7720_write,
2217 .write_room = mos7720_write_room,
2218 .chars_in_buffer = mos7720_chars_in_buffer,
2219 .break_ctl = mos7720_break,
2220 .read_bulk_callback = mos7720_bulk_in_callback,
fb088e33 2221 .read_int_callback = NULL /* dynamically assigned in probe() */
0f64478c
GKH		 2222};
2223
0f64478c
GKH		 2224static int __init moschip7720_init(void)
2225{
2226 int retval;
2227
441b62c1 2228 dbg("%s: Entering ..........", __func__);
0f64478c
GKH		 2229
2230 /* Register with the usb serial */
2231 retval = usb_serial_register(&moschip7720_2port_driver);
2232 if (retval)
2233 goto failed_port_device_register;
2234
c197a8db
GKH		 2235 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2236 DRIVER_DESC "\n");
0f64478c
GKH		 2237
2238 /* Register with the usb */
2239 retval = usb_register(&usb_driver);
2240 if (retval)
2241 goto failed_usb_register;
2242
2243 return 0;
2244
2245failed_usb_register:
2246 usb_serial_deregister(&moschip7720_2port_driver);
2247
2248failed_port_device_register:
2249 return retval;
2250}
2251
2252static void __exit moschip7720_exit(void)
2253{
2254 usb_deregister(&usb_driver);
2255 usb_serial_deregister(&moschip7720_2port_driver);
2256}
2257
2258module_init(moschip7720_init);
2259module_exit(moschip7720_exit);
2260
2261/* Module information */
4da1a17d
AC		 2262MODULE_AUTHOR(DRIVER_AUTHOR);
2263MODULE_DESCRIPTION(DRIVER_DESC);
0f64478c
GKH		 2264MODULE_LICENSE("GPL");
2265
2266module_param(debug, bool, S_IRUGO | S_IWUSR);
2267MODULE_PARM_DESC(debug, "Debug enabled or not");
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