1 /*
2 * mos7720.c
3 * Controls the Moschip 7720 usb to dual port serial converter
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/slab.h>
26 #include <linux/tty.h>
27 #include <linux/tty_driver.h>
28 #include <linux/tty_flip.h>
29 #include <linux/module.h>
30 #include <linux/spinlock.h>
31 #include <linux/serial.h>
32 #include <linux/serial_reg.h>
33 #include <linux/usb.h>
34 #include <linux/usb/serial.h>
35 #include <linux/uaccess.h>
36 #include <linux/parport.h>
37
38 #define DRIVER_AUTHOR "Aspire Communications pvt Ltd."
39 #define DRIVER_DESC "Moschip USB Serial Driver"
40
41 /* default urb timeout */
42 #define MOS_WDR_TIMEOUT 5000
43
44 #define MOS_MAX_PORT 0x02
45 #define MOS_WRITE 0x0E
46 #define MOS_READ 0x0D
47
48 /* Interrupt Routines Defines */
49 #define SERIAL_IIR_RLS 0x06
50 #define SERIAL_IIR_RDA 0x04
51 #define SERIAL_IIR_CTI 0x0c
52 #define SERIAL_IIR_THR 0x02
53 #define SERIAL_IIR_MS 0x00
54
55 #define NUM_URBS 16 /* URB Count */
56 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
57
58 /* This structure holds all of the local serial port information */
59 struct moschip_port {
60 __u8 shadowLCR; /* last LCR value received */
61 __u8 shadowMCR; /* last MCR value received */
62 __u8 shadowMSR; /* last MSR value received */
63 char open;
64 struct usb_serial_port *port; /* loop back to the owner */
65 struct urb *write_urb_pool[NUM_URBS];
66 };
67
68 #define USB_VENDOR_ID_MOSCHIP 0x9710
69 #define MOSCHIP_DEVICE_ID_7720 0x7720
70 #define MOSCHIP_DEVICE_ID_7715 0x7715
71
72 static const struct usb_device_id id_table[] = {
73 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7720) },
74 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7715) },
75 { } /* terminating entry */
76 };
77 MODULE_DEVICE_TABLE(usb, id_table);
78
79 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
80
81 /* initial values for parport regs */
82 #define DCR_INIT_VAL 0x0c /* SLCTIN, nINIT */
83 #define ECR_INIT_VAL 0x00 /* SPP mode */
84
85 struct urbtracker {
86 struct mos7715_parport *mos_parport;
87 struct list_head urblist_entry;
88 struct kref ref_count;
89 struct urb *urb;
90 struct usb_ctrlrequest *setup;
91 };
92
93 enum mos7715_pp_modes {
94 SPP = 0<<5,
95 PS2 = 1<<5, /* moschip calls this 'NIBBLE' mode */
96 PPF = 2<<5, /* moschip calls this 'CB-FIFO mode */
97 };
98
99 struct mos7715_parport {
100 struct parport *pp; /* back to containing struct */
101 struct kref ref_count; /* to instance of this struct */
102 struct list_head deferred_urbs; /* list deferred async urbs */
103 struct list_head active_urbs; /* list async urbs in flight */
104 spinlock_t listlock; /* protects list access */
105 bool msg_pending; /* usb sync call pending */
106 struct completion syncmsg_compl; /* usb sync call completed */
107 struct tasklet_struct urb_tasklet; /* for sending deferred urbs */
108 struct usb_serial *serial; /* back to containing struct */
109 __u8 shadowECR; /* parallel port regs... */
110 __u8 shadowDCR;
111 atomic_t shadowDSR; /* updated in int-in callback */
112 };
113
114 /* lock guards against dereferencing NULL ptr in parport ops callbacks */
115 static DEFINE_SPINLOCK(release_lock);
116
117 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
118
119 static const unsigned int dummy; /* for clarity in register access fns */
120
121 enum mos_regs {
122 MOS7720_THR, /* serial port regs */
123 MOS7720_RHR,
124 MOS7720_IER,
125 MOS7720_FCR,
126 MOS7720_ISR,
127 MOS7720_LCR,
128 MOS7720_MCR,
129 MOS7720_LSR,
130 MOS7720_MSR,
131 MOS7720_SPR,
132 MOS7720_DLL,
133 MOS7720_DLM,
134 MOS7720_DPR, /* parallel port regs */
135 MOS7720_DSR,
136 MOS7720_DCR,
137 MOS7720_ECR,
138 MOS7720_SP1_REG, /* device control regs */
139 MOS7720_SP2_REG, /* serial port 2 (7720 only) */
140 MOS7720_PP_REG,
141 MOS7720_SP_CONTROL_REG,
142 };
143
144 /*
145 * Return the correct value for the Windex field of the setup packet
146 * for a control endpoint message. See the 7715 datasheet.
147 */
get_reg_index(enum mos_regs reg)148 static inline __u16 get_reg_index(enum mos_regs reg)
149 {
150 static const __u16 mos7715_index_lookup_table[] = {
151 0x00, /* MOS7720_THR */
152 0x00, /* MOS7720_RHR */
153 0x01, /* MOS7720_IER */
154 0x02, /* MOS7720_FCR */
155 0x02, /* MOS7720_ISR */
156 0x03, /* MOS7720_LCR */
157 0x04, /* MOS7720_MCR */
158 0x05, /* MOS7720_LSR */
159 0x06, /* MOS7720_MSR */
160 0x07, /* MOS7720_SPR */
161 0x00, /* MOS7720_DLL */
162 0x01, /* MOS7720_DLM */
163 0x00, /* MOS7720_DPR */
164 0x01, /* MOS7720_DSR */
165 0x02, /* MOS7720_DCR */
166 0x0a, /* MOS7720_ECR */
167 0x01, /* MOS7720_SP1_REG */
168 0x02, /* MOS7720_SP2_REG (7720 only) */
169 0x04, /* MOS7720_PP_REG (7715 only) */
170 0x08, /* MOS7720_SP_CONTROL_REG */
171 };
172 return mos7715_index_lookup_table[reg];
173 }
174
175 /*
176 * Return the correct value for the upper byte of the Wvalue field of
177 * the setup packet for a control endpoint message.
178 */
get_reg_value(enum mos_regs reg,unsigned int serial_portnum)179 static inline __u16 get_reg_value(enum mos_regs reg,
180 unsigned int serial_portnum)
181 {
182 if (reg >= MOS7720_SP1_REG) /* control reg */
183 return 0x0000;
184
185 else if (reg >= MOS7720_DPR) /* parallel port reg (7715 only) */
186 return 0x0100;
187
188 else /* serial port reg */
189 return (serial_portnum + 2) << 8;
190 }
191
192 /*
193 * Write data byte to the specified device register. The data is embedded in
194 * the value field of the setup packet. serial_portnum is ignored for registers
195 * not specific to a particular serial port.
196 */
write_mos_reg(struct usb_serial * serial,unsigned int serial_portnum,enum mos_regs reg,__u8 data)197 static int write_mos_reg(struct usb_serial *serial, unsigned int serial_portnum,
198 enum mos_regs reg, __u8 data)
199 {
200 struct usb_device *usbdev = serial->dev;
201 unsigned int pipe = usb_sndctrlpipe(usbdev, 0);
202 __u8 request = (__u8)0x0e;
203 __u8 requesttype = (__u8)0x40;
204 __u16 index = get_reg_index(reg);
205 __u16 value = get_reg_value(reg, serial_portnum) + data;
206 int status = usb_control_msg(usbdev, pipe, request, requesttype, value,
207 index, NULL, 0, MOS_WDR_TIMEOUT);
208 if (status < 0)
209 dev_err(&usbdev->dev,
210 "mos7720: usb_control_msg() failed: %d\n", status);
211 return status;
212 }
213
214 /*
215 * Read data byte from the specified device register. The data returned by the
216 * device is embedded in the value field of the setup packet. serial_portnum is
217 * ignored for registers that are not specific to a particular serial port.
218 */
read_mos_reg(struct usb_serial * serial,unsigned int serial_portnum,enum mos_regs reg,__u8 * data)219 static int read_mos_reg(struct usb_serial *serial, unsigned int serial_portnum,
220 enum mos_regs reg, __u8 *data)
221 {
222 struct usb_device *usbdev = serial->dev;
223 unsigned int pipe = usb_rcvctrlpipe(usbdev, 0);
224 __u8 request = (__u8)0x0d;
225 __u8 requesttype = (__u8)0xc0;
226 __u16 index = get_reg_index(reg);
227 __u16 value = get_reg_value(reg, serial_portnum);
228 u8 *buf;
229 int status;
230
231 buf = kmalloc(1, GFP_KERNEL);
232 if (!buf) {
233 *data = 0;
234 return -ENOMEM;
235 }
236
237 status = usb_control_msg(usbdev, pipe, request, requesttype, value,
238 index, buf, 1, MOS_WDR_TIMEOUT);
239 if (status == 1) {
240 *data = *buf;
241 } else {
242 dev_err(&usbdev->dev,
243 "mos7720: usb_control_msg() failed: %d\n", status);
244 if (status >= 0)
245 status = -EIO;
246 *data = 0;
247 }
248
249 kfree(buf);
250
251 return status;
252 }
253
254 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
255
mos7715_change_mode(struct mos7715_parport * mos_parport,enum mos7715_pp_modes mode)256 static inline int mos7715_change_mode(struct mos7715_parport *mos_parport,
257 enum mos7715_pp_modes mode)
258 {
259 mos_parport->shadowECR = mode;
260 write_mos_reg(mos_parport->serial, dummy, MOS7720_ECR,
261 mos_parport->shadowECR);
262 return 0;
263 }
264
destroy_mos_parport(struct kref * kref)265 static void destroy_mos_parport(struct kref *kref)
266 {
267 struct mos7715_parport *mos_parport =
268 container_of(kref, struct mos7715_parport, ref_count);
269
270 kfree(mos_parport);
271 }
272
destroy_urbtracker(struct kref * kref)273 static void destroy_urbtracker(struct kref *kref)
274 {
275 struct urbtracker *urbtrack =
276 container_of(kref, struct urbtracker, ref_count);
277 struct mos7715_parport *mos_parport = urbtrack->mos_parport;
278
279 usb_free_urb(urbtrack->urb);
280 kfree(urbtrack->setup);
281 kfree(urbtrack);
282 kref_put(&mos_parport->ref_count, destroy_mos_parport);
283 }
284
285 /*
286 * This runs as a tasklet when sending an urb in a non-blocking parallel
287 * port callback had to be deferred because the disconnect mutex could not be
288 * obtained at the time.
289 */
send_deferred_urbs(unsigned long _mos_parport)290 static void send_deferred_urbs(unsigned long _mos_parport)
291 {
292 int ret_val;
293 unsigned long flags;
294 struct mos7715_parport *mos_parport = (void *)_mos_parport;
295 struct urbtracker *urbtrack, *tmp;
296 struct list_head *cursor, *next;
297 struct device *dev;
298
299 /* if release function ran, game over */
300 if (unlikely(mos_parport->serial == NULL))
301 return;
302
303 dev = &mos_parport->serial->dev->dev;
304
305 /* try again to get the mutex */
306 if (!mutex_trylock(&mos_parport->serial->disc_mutex)) {
307 dev_dbg(dev, "%s: rescheduling tasklet\n", __func__);
308 tasklet_schedule(&mos_parport->urb_tasklet);
309 return;
310 }
311
312 /* if device disconnected, game over */
313 if (unlikely(mos_parport->serial->disconnected)) {
314 mutex_unlock(&mos_parport->serial->disc_mutex);
315 return;
316 }
317
318 spin_lock_irqsave(&mos_parport->listlock, flags);
319 if (list_empty(&mos_parport->deferred_urbs)) {
320 spin_unlock_irqrestore(&mos_parport->listlock, flags);
321 mutex_unlock(&mos_parport->serial->disc_mutex);
322 dev_dbg(dev, "%s: deferred_urbs list empty\n", __func__);
323 return;
324 }
325
326 /* move contents of deferred_urbs list to active_urbs list and submit */
327 list_for_each_safe(cursor, next, &mos_parport->deferred_urbs)
328 list_move_tail(cursor, &mos_parport->active_urbs);
329 list_for_each_entry_safe(urbtrack, tmp, &mos_parport->active_urbs,
330 urblist_entry) {
331 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
332 dev_dbg(dev, "%s: urb submitted\n", __func__);
333 if (ret_val) {
334 dev_err(dev, "usb_submit_urb() failed: %d\n", ret_val);
335 list_del(&urbtrack->urblist_entry);
336 kref_put(&urbtrack->ref_count, destroy_urbtracker);
337 }
338 }
339 spin_unlock_irqrestore(&mos_parport->listlock, flags);
340 mutex_unlock(&mos_parport->serial->disc_mutex);
341 }
342
343 /* callback for parallel port control urbs submitted asynchronously */
async_complete(struct urb * urb)344 static void async_complete(struct urb *urb)
345 {
346 struct urbtracker *urbtrack = urb->context;
347 int status = urb->status;
348
349 if (unlikely(status))
350 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n", __func__, status);
351
352 /* remove the urbtracker from the active_urbs list */
353 spin_lock(&urbtrack->mos_parport->listlock);
354 list_del(&urbtrack->urblist_entry);
355 spin_unlock(&urbtrack->mos_parport->listlock);
356 kref_put(&urbtrack->ref_count, destroy_urbtracker);
357 }
358
write_parport_reg_nonblock(struct mos7715_parport * mos_parport,enum mos_regs reg,__u8 data)359 static int write_parport_reg_nonblock(struct mos7715_parport *mos_parport,
360 enum mos_regs reg, __u8 data)
361 {
362 struct urbtracker *urbtrack;
363 int ret_val;
364 unsigned long flags;
365 struct usb_serial *serial = mos_parport->serial;
366 struct usb_device *usbdev = serial->dev;
367
368 /* create and initialize the control urb and containing urbtracker */
369 urbtrack = kmalloc(sizeof(struct urbtracker), GFP_ATOMIC);
370 if (!urbtrack)
371 return -ENOMEM;
372
373 urbtrack->urb = usb_alloc_urb(0, GFP_ATOMIC);
374 if (!urbtrack->urb) {
375 kfree(urbtrack);
376 return -ENOMEM;
377 }
378 urbtrack->setup = kmalloc(sizeof(*urbtrack->setup), GFP_ATOMIC);
379 if (!urbtrack->setup) {
380 usb_free_urb(urbtrack->urb);
381 kfree(urbtrack);
382 return -ENOMEM;
383 }
384 urbtrack->setup->bRequestType = (__u8)0x40;
385 urbtrack->setup->bRequest = (__u8)0x0e;
386 urbtrack->setup->wValue = cpu_to_le16(get_reg_value(reg, dummy));
387 urbtrack->setup->wIndex = cpu_to_le16(get_reg_index(reg));
388 urbtrack->setup->wLength = 0;
389 usb_fill_control_urb(urbtrack->urb, usbdev,
390 usb_sndctrlpipe(usbdev, 0),
391 (unsigned char *)urbtrack->setup,
392 NULL, 0, async_complete, urbtrack);
393 kref_get(&mos_parport->ref_count);
394 urbtrack->mos_parport = mos_parport;
395 kref_init(&urbtrack->ref_count);
396 INIT_LIST_HEAD(&urbtrack->urblist_entry);
397
398 /*
399 * get the disconnect mutex, or add tracker to the deferred_urbs list
400 * and schedule a tasklet to try again later
401 */
402 if (!mutex_trylock(&serial->disc_mutex)) {
403 spin_lock_irqsave(&mos_parport->listlock, flags);
404 list_add_tail(&urbtrack->urblist_entry,
405 &mos_parport->deferred_urbs);
406 spin_unlock_irqrestore(&mos_parport->listlock, flags);
407 tasklet_schedule(&mos_parport->urb_tasklet);
408 dev_dbg(&usbdev->dev, "tasklet scheduled\n");
409 return 0;
410 }
411
412 /* bail if device disconnected */
413 if (serial->disconnected) {
414 kref_put(&urbtrack->ref_count, destroy_urbtracker);
415 mutex_unlock(&serial->disc_mutex);
416 return -ENODEV;
417 }
418
419 /* add the tracker to the active_urbs list and submit */
420 spin_lock_irqsave(&mos_parport->listlock, flags);
421 list_add_tail(&urbtrack->urblist_entry, &mos_parport->active_urbs);
422 spin_unlock_irqrestore(&mos_parport->listlock, flags);
423 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
424 mutex_unlock(&serial->disc_mutex);
425 if (ret_val) {
426 dev_err(&usbdev->dev,
427 "%s: submit_urb() failed: %d\n", __func__, ret_val);
428 spin_lock_irqsave(&mos_parport->listlock, flags);
429 list_del(&urbtrack->urblist_entry);
430 spin_unlock_irqrestore(&mos_parport->listlock, flags);
431 kref_put(&urbtrack->ref_count, destroy_urbtracker);
432 return ret_val;
433 }
434 return 0;
435 }
436
437 /*
438 * This is the the common top part of all parallel port callback operations that
439 * send synchronous messages to the device. This implements convoluted locking
440 * that avoids two scenarios: (1) a port operation is called after usbserial
441 * has called our release function, at which point struct mos7715_parport has
442 * been destroyed, and (2) the device has been disconnected, but usbserial has
443 * not called the release function yet because someone has a serial port open.
444 * The shared release_lock prevents the first, and the mutex and disconnected
445 * flag maintained by usbserial covers the second. We also use the msg_pending
446 * flag to ensure that all synchronous usb message calls have completed before
447 * our release function can return.
448 */
parport_prologue(struct parport * pp)449 static int parport_prologue(struct parport *pp)
450 {
451 struct mos7715_parport *mos_parport;
452
453 spin_lock(&release_lock);
454 mos_parport = pp->private_data;
455 if (unlikely(mos_parport == NULL)) {
456 /* release fn called, port struct destroyed */
457 spin_unlock(&release_lock);
458 return -1;
459 }
460 mos_parport->msg_pending = true; /* synch usb call pending */
461 reinit_completion(&mos_parport->syncmsg_compl);
462 spin_unlock(&release_lock);
463
464 mutex_lock(&mos_parport->serial->disc_mutex);
465 if (mos_parport->serial->disconnected) {
466 /* device disconnected */
467 mutex_unlock(&mos_parport->serial->disc_mutex);
468 mos_parport->msg_pending = false;
469 complete(&mos_parport->syncmsg_compl);
470 return -1;
471 }
472
473 return 0;
474 }
475
476 /*
477 * This is the common bottom part of all parallel port functions that send
478 * synchronous messages to the device.
479 */
parport_epilogue(struct parport * pp)480 static inline void parport_epilogue(struct parport *pp)
481 {
482 struct mos7715_parport *mos_parport = pp->private_data;
483 mutex_unlock(&mos_parport->serial->disc_mutex);
484 mos_parport->msg_pending = false;
485 complete(&mos_parport->syncmsg_compl);
486 }
487
parport_mos7715_write_data(struct parport * pp,unsigned char d)488 static void parport_mos7715_write_data(struct parport *pp, unsigned char d)
489 {
490 struct mos7715_parport *mos_parport = pp->private_data;
491
492 if (parport_prologue(pp) < 0)
493 return;
494 mos7715_change_mode(mos_parport, SPP);
495 write_mos_reg(mos_parport->serial, dummy, MOS7720_DPR, (__u8)d);
496 parport_epilogue(pp);
497 }
498
parport_mos7715_read_data(struct parport * pp)499 static unsigned char parport_mos7715_read_data(struct parport *pp)
500 {
501 struct mos7715_parport *mos_parport = pp->private_data;
502 unsigned char d;
503
504 if (parport_prologue(pp) < 0)
505 return 0;
506 read_mos_reg(mos_parport->serial, dummy, MOS7720_DPR, &d);
507 parport_epilogue(pp);
508 return d;
509 }
510
parport_mos7715_write_control(struct parport * pp,unsigned char d)511 static void parport_mos7715_write_control(struct parport *pp, unsigned char d)
512 {
513 struct mos7715_parport *mos_parport = pp->private_data;
514 __u8 data;
515
516 if (parport_prologue(pp) < 0)
517 return;
518 data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0);
519 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, data);
520 mos_parport->shadowDCR = data;
521 parport_epilogue(pp);
522 }
523
parport_mos7715_read_control(struct parport * pp)524 static unsigned char parport_mos7715_read_control(struct parport *pp)
525 {
526 struct mos7715_parport *mos_parport = pp->private_data;
527 __u8 dcr;
528
529 spin_lock(&release_lock);
530 mos_parport = pp->private_data;
531 if (unlikely(mos_parport == NULL)) {
532 spin_unlock(&release_lock);
533 return 0;
534 }
535 dcr = mos_parport->shadowDCR & 0x0f;
536 spin_unlock(&release_lock);
537 return dcr;
538 }
539
parport_mos7715_frob_control(struct parport * pp,unsigned char mask,unsigned char val)540 static unsigned char parport_mos7715_frob_control(struct parport *pp,
541 unsigned char mask,
542 unsigned char val)
543 {
544 struct mos7715_parport *mos_parport = pp->private_data;
545 __u8 dcr;
546
547 mask &= 0x0f;
548 val &= 0x0f;
549 if (parport_prologue(pp) < 0)
550 return 0;
551 mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val;
552 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
553 mos_parport->shadowDCR);
554 dcr = mos_parport->shadowDCR & 0x0f;
555 parport_epilogue(pp);
556 return dcr;
557 }
558
parport_mos7715_read_status(struct parport * pp)559 static unsigned char parport_mos7715_read_status(struct parport *pp)
560 {
561 unsigned char status;
562 struct mos7715_parport *mos_parport = pp->private_data;
563
564 spin_lock(&release_lock);
565 mos_parport = pp->private_data;
566 if (unlikely(mos_parport == NULL)) { /* release called */
567 spin_unlock(&release_lock);
568 return 0;
569 }
570 status = atomic_read(&mos_parport->shadowDSR) & 0xf8;
571 spin_unlock(&release_lock);
572 return status;
573 }
574
parport_mos7715_enable_irq(struct parport * pp)575 static void parport_mos7715_enable_irq(struct parport *pp)
576 {
577 }
578
parport_mos7715_disable_irq(struct parport * pp)579 static void parport_mos7715_disable_irq(struct parport *pp)
580 {
581 }
582
parport_mos7715_data_forward(struct parport * pp)583 static void parport_mos7715_data_forward(struct parport *pp)
584 {
585 struct mos7715_parport *mos_parport = pp->private_data;
586
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, MOS7720_DCR,
592 mos_parport->shadowDCR);
593 parport_epilogue(pp);
594 }
595
parport_mos7715_data_reverse(struct parport * pp)596 static void parport_mos7715_data_reverse(struct parport *pp)
597 {
598 struct mos7715_parport *mos_parport = pp->private_data;
599
600 if (parport_prologue(pp) < 0)
601 return;
602 mos7715_change_mode(mos_parport, PS2);
603 mos_parport->shadowDCR |= 0x20;
604 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
605 mos_parport->shadowDCR);
606 parport_epilogue(pp);
607 }
608
parport_mos7715_init_state(struct pardevice * dev,struct parport_state * s)609 static void parport_mos7715_init_state(struct pardevice *dev,
610 struct parport_state *s)
611 {
612 s->u.pc.ctr = DCR_INIT_VAL;
613 s->u.pc.ecr = ECR_INIT_VAL;
614 }
615
616 /* N.B. Parport core code requires that this function not block */
parport_mos7715_save_state(struct parport * pp,struct parport_state * s)617 static void parport_mos7715_save_state(struct parport *pp,
618 struct parport_state *s)
619 {
620 struct mos7715_parport *mos_parport;
621
622 spin_lock(&release_lock);
623 mos_parport = pp->private_data;
624 if (unlikely(mos_parport == NULL)) { /* release called */
625 spin_unlock(&release_lock);
626 return;
627 }
628 s->u.pc.ctr = mos_parport->shadowDCR;
629 s->u.pc.ecr = mos_parport->shadowECR;
630 spin_unlock(&release_lock);
631 }
632
633 /* N.B. Parport core code requires that this function not block */
parport_mos7715_restore_state(struct parport * pp,struct parport_state * s)634 static void parport_mos7715_restore_state(struct parport *pp,
635 struct parport_state *s)
636 {
637 struct mos7715_parport *mos_parport;
638
639 spin_lock(&release_lock);
640 mos_parport = pp->private_data;
641 if (unlikely(mos_parport == NULL)) { /* release called */
642 spin_unlock(&release_lock);
643 return;
644 }
645 mos_parport->shadowDCR = s->u.pc.ctr;
646 mos_parport->shadowECR = s->u.pc.ecr;
647 write_parport_reg_nonblock(mos_parport, MOS7720_DCR,
648 mos_parport->shadowDCR);
649 write_parport_reg_nonblock(mos_parport, MOS7720_ECR,
650 mos_parport->shadowECR);
651 spin_unlock(&release_lock);
652 }
653
parport_mos7715_write_compat(struct parport * pp,const void * buffer,size_t len,int flags)654 static size_t parport_mos7715_write_compat(struct parport *pp,
655 const void *buffer,
656 size_t len, int flags)
657 {
658 int retval;
659 struct mos7715_parport *mos_parport = pp->private_data;
660 int actual_len;
661
662 if (parport_prologue(pp) < 0)
663 return 0;
664 mos7715_change_mode(mos_parport, PPF);
665 retval = usb_bulk_msg(mos_parport->serial->dev,
666 usb_sndbulkpipe(mos_parport->serial->dev, 2),
667 (void *)buffer, len, &actual_len,
668 MOS_WDR_TIMEOUT);
669 parport_epilogue(pp);
670 if (retval) {
671 dev_err(&mos_parport->serial->dev->dev,
672 "mos7720: usb_bulk_msg() failed: %d\n", retval);
673 return 0;
674 }
675 return actual_len;
676 }
677
678 static struct parport_operations parport_mos7715_ops = {
679 .owner = THIS_MODULE,
680 .write_data = parport_mos7715_write_data,
681 .read_data = parport_mos7715_read_data,
682
683 .write_control = parport_mos7715_write_control,
684 .read_control = parport_mos7715_read_control,
685 .frob_control = parport_mos7715_frob_control,
686
687 .read_status = parport_mos7715_read_status,
688
689 .enable_irq = parport_mos7715_enable_irq,
690 .disable_irq = parport_mos7715_disable_irq,
691
692 .data_forward = parport_mos7715_data_forward,
693 .data_reverse = parport_mos7715_data_reverse,
694
695 .init_state = parport_mos7715_init_state,
696 .save_state = parport_mos7715_save_state,
697 .restore_state = parport_mos7715_restore_state,
698
699 .compat_write_data = parport_mos7715_write_compat,
700
701 .nibble_read_data = parport_ieee1284_read_nibble,
702 .byte_read_data = parport_ieee1284_read_byte,
703 };
704
705 /*
706 * Allocate and initialize parallel port control struct, initialize
707 * the parallel port hardware device, and register with the parport subsystem.
708 */
mos7715_parport_init(struct usb_serial * serial)709 static int mos7715_parport_init(struct usb_serial *serial)
710 {
711 struct mos7715_parport *mos_parport;
712
713 /* allocate and initialize parallel port control struct */
714 mos_parport = kzalloc(sizeof(struct mos7715_parport), GFP_KERNEL);
715 if (!mos_parport)
716 return -ENOMEM;
717
718 mos_parport->msg_pending = false;
719 kref_init(&mos_parport->ref_count);
720 spin_lock_init(&mos_parport->listlock);
721 INIT_LIST_HEAD(&mos_parport->active_urbs);
722 INIT_LIST_HEAD(&mos_parport->deferred_urbs);
723 usb_set_serial_data(serial, mos_parport); /* hijack private pointer */
724 mos_parport->serial = serial;
725 tasklet_init(&mos_parport->urb_tasklet, send_deferred_urbs,
726 (unsigned long) mos_parport);
727 init_completion(&mos_parport->syncmsg_compl);
728
729 /* cycle parallel port reset bit */
730 write_mos_reg(mos_parport->serial, dummy, MOS7720_PP_REG, (__u8)0x80);
731 write_mos_reg(mos_parport->serial, dummy, MOS7720_PP_REG, (__u8)0x00);
732
733 /* initialize device registers */
734 mos_parport->shadowDCR = DCR_INIT_VAL;
735 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
736 mos_parport->shadowDCR);
737 mos_parport->shadowECR = ECR_INIT_VAL;
738 write_mos_reg(mos_parport->serial, dummy, MOS7720_ECR,
739 mos_parport->shadowECR);
740
741 /* register with parport core */
742 mos_parport->pp = parport_register_port(0, PARPORT_IRQ_NONE,
743 PARPORT_DMA_NONE,
744 &parport_mos7715_ops);
745 if (mos_parport->pp == NULL) {
746 dev_err(&serial->interface->dev,
747 "Could not register parport\n");
748 kref_put(&mos_parport->ref_count, destroy_mos_parport);
749 return -EIO;
750 }
751 mos_parport->pp->private_data = mos_parport;
752 mos_parport->pp->modes = PARPORT_MODE_COMPAT | PARPORT_MODE_PCSPP;
753 mos_parport->pp->dev = &serial->interface->dev;
754 parport_announce_port(mos_parport->pp);
755
756 return 0;
757 }
758 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
759
760 /*
761 * mos7720_interrupt_callback
762 * this is the callback function for when we have received data on the
763 * interrupt endpoint.
764 */
mos7720_interrupt_callback(struct urb * urb)765 static void mos7720_interrupt_callback(struct urb *urb)
766 {
767 int result;
768 int length;
769 int status = urb->status;
770 struct device *dev = &urb->dev->dev;
771 __u8 *data;
772 __u8 sp1;
773 __u8 sp2;
774
775 switch (status) {
776 case 0:
777 /* success */
778 break;
779 case -ECONNRESET:
780 case -ENOENT:
781 case -ESHUTDOWN:
782 /* this urb is terminated, clean up */
783 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
784 return;
785 default:
786 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
787 goto exit;
788 }
789
790 length = urb->actual_length;
791 data = urb->transfer_buffer;
792
793 /* Moschip get 4 bytes
794 * Byte 1 IIR Port 1 (port.number is 0)
795 * Byte 2 IIR Port 2 (port.number is 1)
796 * Byte 3 --------------
797 * Byte 4 FIFO status for both */
798
799 /* the above description is inverted
800 * oneukum 2007-03-14 */
801
802 if (unlikely(length != 4)) {
803 dev_dbg(dev, "Wrong data !!!\n");
804 return;
805 }
806
807 sp1 = data[3];
808 sp2 = data[2];
809
810 if ((sp1 | sp2) & 0x01) {
811 /* No Interrupt Pending in both the ports */
812 dev_dbg(dev, "No Interrupt !!!\n");
813 } else {
814 switch (sp1 & 0x0f) {
815 case SERIAL_IIR_RLS:
816 dev_dbg(dev, "Serial Port 1: Receiver status error or address bit detected in 9-bit mode\n");
817 break;
818 case SERIAL_IIR_CTI:
819 dev_dbg(dev, "Serial Port 1: Receiver time out\n");
820 break;
821 case SERIAL_IIR_MS:
822 /* dev_dbg(dev, "Serial Port 1: Modem status change\n"); */
823 break;
824 }
825
826 switch (sp2 & 0x0f) {
827 case SERIAL_IIR_RLS:
828 dev_dbg(dev, "Serial Port 2: Receiver status error or address bit detected in 9-bit mode\n");
829 break;
830 case SERIAL_IIR_CTI:
831 dev_dbg(dev, "Serial Port 2: Receiver time out\n");
832 break;
833 case SERIAL_IIR_MS:
834 /* dev_dbg(dev, "Serial Port 2: Modem status change\n"); */
835 break;
836 }
837 }
838
839 exit:
840 result = usb_submit_urb(urb, GFP_ATOMIC);
841 if (result)
842 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result);
843 }
844
845 /*
846 * mos7715_interrupt_callback
847 * this is the 7715's callback function for when we have received data on
848 * the interrupt endpoint.
849 */
mos7715_interrupt_callback(struct urb * urb)850 static void mos7715_interrupt_callback(struct urb *urb)
851 {
852 int result;
853 int length;
854 int status = urb->status;
855 struct device *dev = &urb->dev->dev;
856 __u8 *data;
857 __u8 iir;
858
859 switch (status) {
860 case 0:
861 /* success */
862 break;
863 case -ECONNRESET:
864 case -ENOENT:
865 case -ESHUTDOWN:
866 case -ENODEV:
867 /* this urb is terminated, clean up */
868 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
869 return;
870 default:
871 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
872 goto exit;
873 }
874
875 length = urb->actual_length;
876 data = urb->transfer_buffer;
877
878 /* Structure of data from 7715 device:
879 * Byte 1: IIR serial Port
880 * Byte 2: unused
881 * Byte 2: DSR parallel port
882 * Byte 4: FIFO status for both */
883
884 if (unlikely(length != 4)) {
885 dev_dbg(dev, "Wrong data !!!\n");
886 return;
887 }
888
889 iir = data[0];
890 if (!(iir & 0x01)) { /* serial port interrupt pending */
891 switch (iir & 0x0f) {
892 case SERIAL_IIR_RLS:
893 dev_dbg(dev, "Serial Port: Receiver status error or address bit detected in 9-bit mode\n");
894 break;
895 case SERIAL_IIR_CTI:
896 dev_dbg(dev, "Serial Port: Receiver time out\n");
897 break;
898 case SERIAL_IIR_MS:
899 /* dev_dbg(dev, "Serial Port: Modem status change\n"); */
900 break;
901 }
902 }
903
904 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
905 { /* update local copy of DSR reg */
906 struct usb_serial_port *port = urb->context;
907 struct mos7715_parport *mos_parport = port->serial->private;
908 if (unlikely(mos_parport == NULL))
909 return;
910 atomic_set(&mos_parport->shadowDSR, data[2]);
911 }
912 #endif
913
914 exit:
915 result = usb_submit_urb(urb, GFP_ATOMIC);
916 if (result)
917 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result);
918 }
919
920 /*
921 * mos7720_bulk_in_callback
922 * this is the callback function for when we have received data on the
923 * bulk in endpoint.
924 */
mos7720_bulk_in_callback(struct urb * urb)925 static void mos7720_bulk_in_callback(struct urb *urb)
926 {
927 int retval;
928 unsigned char *data ;
929 struct usb_serial_port *port;
930 int status = urb->status;
931
932 if (status) {
933 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
934 return;
935 }
936
937 port = urb->context;
938
939 dev_dbg(&port->dev, "Entering...%s\n", __func__);
940
941 data = urb->transfer_buffer;
942
943 if (urb->actual_length) {
944 tty_insert_flip_string(&port->port, data, urb->actual_length);
945 tty_flip_buffer_push(&port->port);
946 }
947
948 if (port->read_urb->status != -EINPROGRESS) {
949 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
950 if (retval)
951 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
952 }
953 }
954
955 /*
956 * mos7720_bulk_out_data_callback
957 * this is the callback function for when we have finished sending serial
958 * data on the bulk out endpoint.
959 */
mos7720_bulk_out_data_callback(struct urb * urb)960 static void mos7720_bulk_out_data_callback(struct urb *urb)
961 {
962 struct moschip_port *mos7720_port;
963 int status = urb->status;
964
965 if (status) {
966 dev_dbg(&urb->dev->dev, "nonzero write bulk status received:%d\n", status);
967 return;
968 }
969
970 mos7720_port = urb->context;
971 if (!mos7720_port) {
972 dev_dbg(&urb->dev->dev, "NULL mos7720_port pointer\n");
973 return ;
974 }
975
976 if (mos7720_port->open)
977 tty_port_tty_wakeup(&mos7720_port->port->port);
978 }
979
mos77xx_calc_num_ports(struct usb_serial * serial)980 static int mos77xx_calc_num_ports(struct usb_serial *serial)
981 {
982 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
983 if (product == MOSCHIP_DEVICE_ID_7715)
984 return 1;
985
986 return 2;
987 }
988
mos7720_open(struct tty_struct * tty,struct usb_serial_port * port)989 static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port)
990 {
991 struct usb_serial *serial;
992 struct urb *urb;
993 struct moschip_port *mos7720_port;
994 int response;
995 int port_number;
996 __u8 data;
997 int allocated_urbs = 0;
998 int j;
999
1000 serial = port->serial;
1001
1002 mos7720_port = usb_get_serial_port_data(port);
1003 if (mos7720_port == NULL)
1004 return -ENODEV;
1005
1006 usb_clear_halt(serial->dev, port->write_urb->pipe);
1007 usb_clear_halt(serial->dev, port->read_urb->pipe);
1008
1009 /* Initialising the write urb pool */
1010 for (j = 0; j < NUM_URBS; ++j) {
1011 urb = usb_alloc_urb(0, GFP_KERNEL);
1012 mos7720_port->write_urb_pool[j] = urb;
1013 if (!urb)
1014 continue;
1015
1016 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1017 GFP_KERNEL);
1018 if (!urb->transfer_buffer) {
1019 usb_free_urb(mos7720_port->write_urb_pool[j]);
1020 mos7720_port->write_urb_pool[j] = NULL;
1021 continue;
1022 }
1023 allocated_urbs++;
1024 }
1025
1026 if (!allocated_urbs)
1027 return -ENOMEM;
1028
1029 /* Initialize MCS7720 -- Write Init values to corresponding Registers
1030 *
1031 * Register Index
1032 * 0 : MOS7720_THR/MOS7720_RHR
1033 * 1 : MOS7720_IER
1034 * 2 : MOS7720_FCR
1035 * 3 : MOS7720_LCR
1036 * 4 : MOS7720_MCR
1037 * 5 : MOS7720_LSR
1038 * 6 : MOS7720_MSR
1039 * 7 : MOS7720_SPR
1040 *
1041 * 0x08 : SP1/2 Control Reg
1042 */
1043 port_number = port->port_number;
1044 read_mos_reg(serial, port_number, MOS7720_LSR, &data);
1045
1046 dev_dbg(&port->dev, "SS::%p LSR:%x\n", mos7720_port, data);
1047
1048 write_mos_reg(serial, dummy, MOS7720_SP1_REG, 0x02);
1049 write_mos_reg(serial, dummy, MOS7720_SP2_REG, 0x02);
1050
1051 write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
1052 write_mos_reg(serial, port_number, MOS7720_FCR, 0x00);
1053
1054 write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf);
1055 mos7720_port->shadowLCR = 0x03;
1056 write_mos_reg(serial, port_number, MOS7720_LCR,
1057 mos7720_port->shadowLCR);
1058 mos7720_port->shadowMCR = 0x0b;
1059 write_mos_reg(serial, port_number, MOS7720_MCR,
1060 mos7720_port->shadowMCR);
1061
1062 write_mos_reg(serial, port_number, MOS7720_SP_CONTROL_REG, 0x00);
1063 read_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, &data);
1064 data = data | (port->port_number + 1);
1065 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, data);
1066 mos7720_port->shadowLCR = 0x83;
1067 write_mos_reg(serial, port_number, MOS7720_LCR,
1068 mos7720_port->shadowLCR);
1069 write_mos_reg(serial, port_number, MOS7720_THR, 0x0c);
1070 write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
1071 mos7720_port->shadowLCR = 0x03;
1072 write_mos_reg(serial, port_number, MOS7720_LCR,
1073 mos7720_port->shadowLCR);
1074 write_mos_reg(serial, port_number, MOS7720_IER, 0x0c);
1075
1076 response = usb_submit_urb(port->read_urb, GFP_KERNEL);
1077 if (response)
1078 dev_err(&port->dev, "%s - Error %d submitting read urb\n",
1079 __func__, response);
1080
1081 /* initialize our port settings */
1082 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */
1083
1084 /* send a open port command */
1085 mos7720_port->open = 1;
1086
1087 return 0;
1088 }
1089
1090 /*
1091 * mos7720_chars_in_buffer
1092 * this function is called by the tty driver when it wants to know how many
1093 * bytes of data we currently have outstanding in the port (data that has
1094 * been written, but hasn't made it out the port yet)
1095 * If successful, we return the number of bytes left to be written in the
1096 * system,
1097 * Otherwise we return a negative error number.
1098 */
mos7720_chars_in_buffer(struct tty_struct * tty)1099 static int mos7720_chars_in_buffer(struct tty_struct *tty)
1100 {
1101 struct usb_serial_port *port = tty->driver_data;
1102 int i;
1103 int chars = 0;
1104 struct moschip_port *mos7720_port;
1105
1106 mos7720_port = usb_get_serial_port_data(port);
1107 if (mos7720_port == NULL)
1108 return 0;
1109
1110 for (i = 0; i < NUM_URBS; ++i) {
1111 if (mos7720_port->write_urb_pool[i] &&
1112 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS)
1113 chars += URB_TRANSFER_BUFFER_SIZE;
1114 }
1115 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1116 return chars;
1117 }
1118
mos7720_close(struct usb_serial_port * port)1119 static void mos7720_close(struct usb_serial_port *port)
1120 {
1121 struct usb_serial *serial;
1122 struct moschip_port *mos7720_port;
1123 int j;
1124
1125 serial = port->serial;
1126
1127 mos7720_port = usb_get_serial_port_data(port);
1128 if (mos7720_port == NULL)
1129 return;
1130
1131 for (j = 0; j < NUM_URBS; ++j)
1132 usb_kill_urb(mos7720_port->write_urb_pool[j]);
1133
1134 /* Freeing Write URBs */
1135 for (j = 0; j < NUM_URBS; ++j) {
1136 if (mos7720_port->write_urb_pool[j]) {
1137 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer);
1138 usb_free_urb(mos7720_port->write_urb_pool[j]);
1139 }
1140 }
1141
1142 /* While closing port, shutdown all bulk read, write *
1143 * and interrupt read if they exists, otherwise nop */
1144 usb_kill_urb(port->write_urb);
1145 usb_kill_urb(port->read_urb);
1146
1147 write_mos_reg(serial, port->port_number, MOS7720_MCR, 0x00);
1148 write_mos_reg(serial, port->port_number, MOS7720_IER, 0x00);
1149
1150 mos7720_port->open = 0;
1151 }
1152
mos7720_break(struct tty_struct * tty,int break_state)1153 static void mos7720_break(struct tty_struct *tty, int break_state)
1154 {
1155 struct usb_serial_port *port = tty->driver_data;
1156 unsigned char data;
1157 struct usb_serial *serial;
1158 struct moschip_port *mos7720_port;
1159
1160 serial = port->serial;
1161
1162 mos7720_port = usb_get_serial_port_data(port);
1163 if (mos7720_port == NULL)
1164 return;
1165
1166 if (break_state == -1)
1167 data = mos7720_port->shadowLCR | UART_LCR_SBC;
1168 else
1169 data = mos7720_port->shadowLCR & ~UART_LCR_SBC;
1170
1171 mos7720_port->shadowLCR = data;
1172 write_mos_reg(serial, port->port_number, MOS7720_LCR,
1173 mos7720_port->shadowLCR);
1174 }
1175
1176 /*
1177 * mos7720_write_room
1178 * this function is called by the tty driver when it wants to know how many
1179 * bytes of data we can accept for a specific port.
1180 * If successful, we return the amount of room that we have for this port
1181 * Otherwise we return a negative error number.
1182 */
mos7720_write_room(struct tty_struct * tty)1183 static int mos7720_write_room(struct tty_struct *tty)
1184 {
1185 struct usb_serial_port *port = tty->driver_data;
1186 struct moschip_port *mos7720_port;
1187 int room = 0;
1188 int i;
1189
1190 mos7720_port = usb_get_serial_port_data(port);
1191 if (mos7720_port == NULL)
1192 return -ENODEV;
1193
1194 /* FIXME: Locking */
1195 for (i = 0; i < NUM_URBS; ++i) {
1196 if (mos7720_port->write_urb_pool[i] &&
1197 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS)
1198 room += URB_TRANSFER_BUFFER_SIZE;
1199 }
1200
1201 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
1202 return room;
1203 }
1204
mos7720_write(struct tty_struct * tty,struct usb_serial_port * port,const unsigned char * data,int count)1205 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port,
1206 const unsigned char *data, int count)
1207 {
1208 int status;
1209 int i;
1210 int bytes_sent = 0;
1211 int transfer_size;
1212
1213 struct moschip_port *mos7720_port;
1214 struct usb_serial *serial;
1215 struct urb *urb;
1216 const unsigned char *current_position = data;
1217
1218 serial = port->serial;
1219
1220 mos7720_port = usb_get_serial_port_data(port);
1221 if (mos7720_port == NULL)
1222 return -ENODEV;
1223
1224 /* try to find a free urb in the list */
1225 urb = NULL;
1226
1227 for (i = 0; i < NUM_URBS; ++i) {
1228 if (mos7720_port->write_urb_pool[i] &&
1229 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) {
1230 urb = mos7720_port->write_urb_pool[i];
1231 dev_dbg(&port->dev, "URB:%d\n", i);
1232 break;
1233 }
1234 }
1235
1236 if (urb == NULL) {
1237 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1238 goto exit;
1239 }
1240
1241 if (urb->transfer_buffer == NULL) {
1242 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1243 GFP_ATOMIC);
1244 if (!urb->transfer_buffer) {
1245 bytes_sent = -ENOMEM;
1246 goto exit;
1247 }
1248 }
1249 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1250
1251 memcpy(urb->transfer_buffer, current_position, transfer_size);
1252 usb_serial_debug_data(&port->dev, __func__, transfer_size,
1253 urb->transfer_buffer);
1254
1255 /* fill urb with data and submit */
1256 usb_fill_bulk_urb(urb, serial->dev,
1257 usb_sndbulkpipe(serial->dev,
1258 port->bulk_out_endpointAddress),
1259 urb->transfer_buffer, transfer_size,
1260 mos7720_bulk_out_data_callback, mos7720_port);
1261
1262 /* send it down the pipe */
1263 status = usb_submit_urb(urb, GFP_ATOMIC);
1264 if (status) {
1265 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1266 "with status = %d\n", __func__, status);
1267 bytes_sent = status;
1268 goto exit;
1269 }
1270 bytes_sent = transfer_size;
1271
1272 exit:
1273 return bytes_sent;
1274 }
1275
mos7720_throttle(struct tty_struct * tty)1276 static void mos7720_throttle(struct tty_struct *tty)
1277 {
1278 struct usb_serial_port *port = tty->driver_data;
1279 struct moschip_port *mos7720_port;
1280 int status;
1281
1282 mos7720_port = usb_get_serial_port_data(port);
1283
1284 if (mos7720_port == NULL)
1285 return;
1286
1287 if (!mos7720_port->open) {
1288 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1289 return;
1290 }
1291
1292 /* if we are implementing XON/XOFF, send the stop character */
1293 if (I_IXOFF(tty)) {
1294 unsigned char stop_char = STOP_CHAR(tty);
1295 status = mos7720_write(tty, port, &stop_char, 1);
1296 if (status <= 0)
1297 return;
1298 }
1299
1300 /* if we are implementing RTS/CTS, toggle that line */
1301 if (tty->termios.c_cflag & CRTSCTS) {
1302 mos7720_port->shadowMCR &= ~UART_MCR_RTS;
1303 write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
1304 mos7720_port->shadowMCR);
1305 }
1306 }
1307
mos7720_unthrottle(struct tty_struct * tty)1308 static void mos7720_unthrottle(struct tty_struct *tty)
1309 {
1310 struct usb_serial_port *port = tty->driver_data;
1311 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1312 int status;
1313
1314 if (mos7720_port == NULL)
1315 return;
1316
1317 if (!mos7720_port->open) {
1318 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1319 return;
1320 }
1321
1322 /* if we are implementing XON/XOFF, send the start character */
1323 if (I_IXOFF(tty)) {
1324 unsigned char start_char = START_CHAR(tty);
1325 status = mos7720_write(tty, port, &start_char, 1);
1326 if (status <= 0)
1327 return;
1328 }
1329
1330 /* if we are implementing RTS/CTS, toggle that line */
1331 if (tty->termios.c_cflag & CRTSCTS) {
1332 mos7720_port->shadowMCR |= UART_MCR_RTS;
1333 write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
1334 mos7720_port->shadowMCR);
1335 }
1336 }
1337
1338 /* FIXME: this function does not work */
set_higher_rates(struct moschip_port * mos7720_port,unsigned int baud)1339 static int set_higher_rates(struct moschip_port *mos7720_port,
1340 unsigned int baud)
1341 {
1342 struct usb_serial_port *port;
1343 struct usb_serial *serial;
1344 int port_number;
1345 enum mos_regs sp_reg;
1346 if (mos7720_port == NULL)
1347 return -EINVAL;
1348
1349 port = mos7720_port->port;
1350 serial = port->serial;
1351
1352 /***********************************************
1353 * Init Sequence for higher rates
1354 ***********************************************/
1355 dev_dbg(&port->dev, "Sending Setting Commands ..........\n");
1356 port_number = port->port_number;
1357
1358 write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
1359 write_mos_reg(serial, port_number, MOS7720_FCR, 0x00);
1360 write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf);
1361 mos7720_port->shadowMCR = 0x0b;
1362 write_mos_reg(serial, port_number, MOS7720_MCR,
1363 mos7720_port->shadowMCR);
1364 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 0x00);
1365
1366 /***********************************************
1367 * Set for higher rates *
1368 ***********************************************/
1369 /* writing baud rate verbatum into uart clock field clearly not right */
1370 if (port_number == 0)
1371 sp_reg = MOS7720_SP1_REG;
1372 else
1373 sp_reg = MOS7720_SP2_REG;
1374 write_mos_reg(serial, dummy, sp_reg, baud * 0x10);
1375 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 0x03);
1376 mos7720_port->shadowMCR = 0x2b;
1377 write_mos_reg(serial, port_number, MOS7720_MCR,
1378 mos7720_port->shadowMCR);
1379
1380 /***********************************************
1381 * Set DLL/DLM
1382 ***********************************************/
1383 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1384 write_mos_reg(serial, port_number, MOS7720_LCR,
1385 mos7720_port->shadowLCR);
1386 write_mos_reg(serial, port_number, MOS7720_DLL, 0x01);
1387 write_mos_reg(serial, port_number, MOS7720_DLM, 0x00);
1388 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1389 write_mos_reg(serial, port_number, MOS7720_LCR,
1390 mos7720_port->shadowLCR);
1391
1392 return 0;
1393 }
1394
1395 /* baud rate information */
1396 struct divisor_table_entry {
1397 __u32 baudrate;
1398 __u16 divisor;
1399 };
1400
1401 /* Define table of divisors for moschip 7720 hardware *
1402 * These assume a 3.6864MHz crystal, the standard /16, and *
1403 * MCR.7 = 0. */
1404 static struct divisor_table_entry divisor_table[] = {
1405 { 50, 2304},
1406 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */
1407 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */
1408 { 150, 768},
1409 { 300, 384},
1410 { 600, 192},
1411 { 1200, 96},
1412 { 1800, 64},
1413 { 2400, 48},
1414 { 4800, 24},
1415 { 7200, 16},
1416 { 9600, 12},
1417 { 19200, 6},
1418 { 38400, 3},
1419 { 57600, 2},
1420 { 115200, 1},
1421 };
1422
1423 /*****************************************************************************
1424 * calc_baud_rate_divisor
1425 * this function calculates the proper baud rate divisor for the specified
1426 * baud rate.
1427 *****************************************************************************/
calc_baud_rate_divisor(struct usb_serial_port * port,int baudrate,int * divisor)1428 static int calc_baud_rate_divisor(struct usb_serial_port *port, int baudrate, int *divisor)
1429 {
1430 int i;
1431 __u16 custom;
1432 __u16 round1;
1433 __u16 round;
1434
1435
1436 dev_dbg(&port->dev, "%s - %d\n", __func__, baudrate);
1437
1438 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) {
1439 if (divisor_table[i].baudrate == baudrate) {
1440 *divisor = divisor_table[i].divisor;
1441 return 0;
1442 }
1443 }
1444
1445 /* After trying for all the standard baud rates *
1446 * Try calculating the divisor for this baud rate */
1447 if (baudrate > 75 && baudrate < 230400) {
1448 /* get the divisor */
1449 custom = (__u16)(230400L / baudrate);
1450
1451 /* Check for round off */
1452 round1 = (__u16)(2304000L / baudrate);
1453 round = (__u16)(round1 - (custom * 10));
1454 if (round > 4)
1455 custom++;
1456 *divisor = custom;
1457
1458 dev_dbg(&port->dev, "Baud %d = %d\n", baudrate, custom);
1459 return 0;
1460 }
1461
1462 dev_dbg(&port->dev, "Baud calculation Failed...\n");
1463 return -EINVAL;
1464 }
1465
1466 /*
1467 * send_cmd_write_baud_rate
1468 * this function sends the proper command to change the baud rate of the
1469 * specified port.
1470 */
send_cmd_write_baud_rate(struct moschip_port * mos7720_port,int baudrate)1471 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port,
1472 int baudrate)
1473 {
1474 struct usb_serial_port *port;
1475 struct usb_serial *serial;
1476 int divisor;
1477 int status;
1478 unsigned char number;
1479
1480 if (mos7720_port == NULL)
1481 return -1;
1482
1483 port = mos7720_port->port;
1484 serial = port->serial;
1485
1486 number = port->port_number;
1487 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudrate);
1488
1489 /* Calculate the Divisor */
1490 status = calc_baud_rate_divisor(port, baudrate, &divisor);
1491 if (status) {
1492 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1493 return status;
1494 }
1495
1496 /* Enable access to divisor latch */
1497 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1498 write_mos_reg(serial, number, MOS7720_LCR, mos7720_port->shadowLCR);
1499
1500 /* Write the divisor */
1501 write_mos_reg(serial, number, MOS7720_DLL, (__u8)(divisor & 0xff));
1502 write_mos_reg(serial, number, MOS7720_DLM,
1503 (__u8)((divisor & 0xff00) >> 8));
1504
1505 /* Disable access to divisor latch */
1506 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1507 write_mos_reg(serial, number, MOS7720_LCR, mos7720_port->shadowLCR);
1508
1509 return status;
1510 }
1511
1512 /*
1513 * change_port_settings
1514 * This routine is called to set the UART on the device to match
1515 * the specified new settings.
1516 */
change_port_settings(struct tty_struct * tty,struct moschip_port * mos7720_port,struct ktermios * old_termios)1517 static void change_port_settings(struct tty_struct *tty,
1518 struct moschip_port *mos7720_port,
1519 struct ktermios *old_termios)
1520 {
1521 struct usb_serial_port *port;
1522 struct usb_serial *serial;
1523 int baud;
1524 unsigned cflag;
1525 unsigned iflag;
1526 __u8 mask = 0xff;
1527 __u8 lData;
1528 __u8 lParity;
1529 __u8 lStop;
1530 int status;
1531 int port_number;
1532
1533 if (mos7720_port == NULL)
1534 return ;
1535
1536 port = mos7720_port->port;
1537 serial = port->serial;
1538 port_number = port->port_number;
1539
1540 if (!mos7720_port->open) {
1541 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1542 return;
1543 }
1544
1545 lData = UART_LCR_WLEN8;
1546 lStop = 0x00; /* 1 stop bit */
1547 lParity = 0x00; /* No parity */
1548
1549 cflag = tty->termios.c_cflag;
1550 iflag = tty->termios.c_iflag;
1551
1552 /* Change the number of bits */
1553 switch (cflag & CSIZE) {
1554 case CS5:
1555 lData = UART_LCR_WLEN5;
1556 mask = 0x1f;
1557 break;
1558
1559 case CS6:
1560 lData = UART_LCR_WLEN6;
1561 mask = 0x3f;
1562 break;
1563
1564 case CS7:
1565 lData = UART_LCR_WLEN7;
1566 mask = 0x7f;
1567 break;
1568 default:
1569 case CS8:
1570 lData = UART_LCR_WLEN8;
1571 break;
1572 }
1573
1574 /* Change the Parity bit */
1575 if (cflag & PARENB) {
1576 if (cflag & PARODD) {
1577 lParity = UART_LCR_PARITY;
1578 dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1579 } else {
1580 lParity = (UART_LCR_EPAR | UART_LCR_PARITY);
1581 dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1582 }
1583
1584 } else {
1585 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1586 }
1587
1588 if (cflag & CMSPAR)
1589 lParity = lParity | 0x20;
1590
1591 /* Change the Stop bit */
1592 if (cflag & CSTOPB) {
1593 lStop = UART_LCR_STOP;
1594 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1595 } else {
1596 lStop = 0x00;
1597 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1598 }
1599
1600 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
1601 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
1602 #define LCR_PAR_MASK 0x38 /* Mask for parity field */
1603
1604 /* Update the LCR with the correct value */
1605 mos7720_port->shadowLCR &=
1606 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1607 mos7720_port->shadowLCR |= (lData | lParity | lStop);
1608
1609
1610 /* Disable Interrupts */
1611 write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
1612 write_mos_reg(serial, port_number, MOS7720_FCR, 0x00);
1613 write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf);
1614
1615 /* Send the updated LCR value to the mos7720 */
1616 write_mos_reg(serial, port_number, MOS7720_LCR,
1617 mos7720_port->shadowLCR);
1618 mos7720_port->shadowMCR = 0x0b;
1619 write_mos_reg(serial, port_number, MOS7720_MCR,
1620 mos7720_port->shadowMCR);
1621
1622 /* set up the MCR register and send it to the mos7720 */
1623 mos7720_port->shadowMCR = UART_MCR_OUT2;
1624 if (cflag & CBAUD)
1625 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS);
1626
1627 if (cflag & CRTSCTS) {
1628 mos7720_port->shadowMCR |= (UART_MCR_XONANY);
1629 /* To set hardware flow control to the specified *
1630 * serial port, in SP1/2_CONTROL_REG */
1631 if (port_number)
1632 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG,
1633 0x01);
1634 else
1635 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG,
1636 0x02);
1637
1638 } else
1639 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY);
1640
1641 write_mos_reg(serial, port_number, MOS7720_MCR,
1642 mos7720_port->shadowMCR);
1643
1644 /* Determine divisor based on baud rate */
1645 baud = tty_get_baud_rate(tty);
1646 if (!baud) {
1647 /* pick a default, any default... */
1648 dev_dbg(&port->dev, "Picked default baud...\n");
1649 baud = 9600;
1650 }
1651
1652 if (baud >= 230400) {
1653 set_higher_rates(mos7720_port, baud);
1654 /* Enable Interrupts */
1655 write_mos_reg(serial, port_number, MOS7720_IER, 0x0c);
1656 return;
1657 }
1658
1659 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1660 status = send_cmd_write_baud_rate(mos7720_port, baud);
1661 /* FIXME: needs to write actual resulting baud back not just
1662 blindly do so */
1663 if (cflag & CBAUD)
1664 tty_encode_baud_rate(tty, baud, baud);
1665 /* Enable Interrupts */
1666 write_mos_reg(serial, port_number, MOS7720_IER, 0x0c);
1667
1668 if (port->read_urb->status != -EINPROGRESS) {
1669 status = usb_submit_urb(port->read_urb, GFP_KERNEL);
1670 if (status)
1671 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status);
1672 }
1673 }
1674
1675 /*
1676 * mos7720_set_termios
1677 * this function is called by the tty driver when it wants to change the
1678 * termios structure.
1679 */
mos7720_set_termios(struct tty_struct * tty,struct usb_serial_port * port,struct ktermios * old_termios)1680 static void mos7720_set_termios(struct tty_struct *tty,
1681 struct usb_serial_port *port, struct ktermios *old_termios)
1682 {
1683 int status;
1684 unsigned int cflag;
1685 struct usb_serial *serial;
1686 struct moschip_port *mos7720_port;
1687
1688 serial = port->serial;
1689
1690 mos7720_port = usb_get_serial_port_data(port);
1691
1692 if (mos7720_port == NULL)
1693 return;
1694
1695 if (!mos7720_port->open) {
1696 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1697 return;
1698 }
1699
1700 dev_dbg(&port->dev, "setting termios - ASPIRE\n");
1701
1702 cflag = tty->termios.c_cflag;
1703
1704 dev_dbg(&port->dev, "%s - cflag %08x iflag %08x\n", __func__,
1705 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
1706
1707 dev_dbg(&port->dev, "%s - old cflag %08x old iflag %08x\n", __func__,
1708 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
1709
1710 /* change the port settings to the new ones specified */
1711 change_port_settings(tty, mos7720_port, old_termios);
1712
1713 if (port->read_urb->status != -EINPROGRESS) {
1714 status = usb_submit_urb(port->read_urb, GFP_KERNEL);
1715 if (status)
1716 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status);
1717 }
1718 }
1719
1720 /*
1721 * get_lsr_info - get line status register info
1722 *
1723 * Purpose: Let user call ioctl() to get info when the UART physically
1724 * is emptied. On bus types like RS485, the transmitter must
1725 * release the bus after transmitting. This must be done when
1726 * the transmit shift register is empty, not be done when the
1727 * transmit holding register is empty. This functionality
1728 * allows an RS485 driver to be written in user space.
1729 */
get_lsr_info(struct tty_struct * tty,struct moschip_port * mos7720_port,unsigned int __user * value)1730 static int get_lsr_info(struct tty_struct *tty,
1731 struct moschip_port *mos7720_port, unsigned int __user *value)
1732 {
1733 struct usb_serial_port *port = tty->driver_data;
1734 unsigned int result = 0;
1735 unsigned char data = 0;
1736 int port_number = port->port_number;
1737 int count;
1738
1739 count = mos7720_chars_in_buffer(tty);
1740 if (count == 0) {
1741 read_mos_reg(port->serial, port_number, MOS7720_LSR, &data);
1742 if ((data & (UART_LSR_TEMT | UART_LSR_THRE))
1743 == (UART_LSR_TEMT | UART_LSR_THRE)) {
1744 dev_dbg(&port->dev, "%s -- Empty\n", __func__);
1745 result = TIOCSER_TEMT;
1746 }
1747 }
1748 if (copy_to_user(value, &result, sizeof(int)))
1749 return -EFAULT;
1750 return 0;
1751 }
1752
mos7720_tiocmget(struct tty_struct * tty)1753 static int mos7720_tiocmget(struct tty_struct *tty)
1754 {
1755 struct usb_serial_port *port = tty->driver_data;
1756 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1757 unsigned int result = 0;
1758 unsigned int mcr ;
1759 unsigned int msr ;
1760
1761 mcr = mos7720_port->shadowMCR;
1762 msr = mos7720_port->shadowMSR;
1763
1764 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */
1765 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */
1766 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */
1767 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */
1768 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */
1769 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
1770
1771 return result;
1772 }
1773
mos7720_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)1774 static int mos7720_tiocmset(struct tty_struct *tty,
1775 unsigned int set, unsigned int clear)
1776 {
1777 struct usb_serial_port *port = tty->driver_data;
1778 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1779 unsigned int mcr ;
1780
1781 mcr = mos7720_port->shadowMCR;
1782
1783 if (set & TIOCM_RTS)
1784 mcr |= UART_MCR_RTS;
1785 if (set & TIOCM_DTR)
1786 mcr |= UART_MCR_DTR;
1787 if (set & TIOCM_LOOP)
1788 mcr |= UART_MCR_LOOP;
1789
1790 if (clear & TIOCM_RTS)
1791 mcr &= ~UART_MCR_RTS;
1792 if (clear & TIOCM_DTR)
1793 mcr &= ~UART_MCR_DTR;
1794 if (clear & TIOCM_LOOP)
1795 mcr &= ~UART_MCR_LOOP;
1796
1797 mos7720_port->shadowMCR = mcr;
1798 write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
1799 mos7720_port->shadowMCR);
1800
1801 return 0;
1802 }
1803
set_modem_info(struct moschip_port * mos7720_port,unsigned int cmd,unsigned int __user * value)1804 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd,
1805 unsigned int __user *value)
1806 {
1807 unsigned int mcr;
1808 unsigned int arg;
1809
1810 struct usb_serial_port *port;
1811
1812 if (mos7720_port == NULL)
1813 return -1;
1814
1815 port = (struct usb_serial_port *)mos7720_port->port;
1816 mcr = mos7720_port->shadowMCR;
1817
1818 if (copy_from_user(&arg, value, sizeof(int)))
1819 return -EFAULT;
1820
1821 switch (cmd) {
1822 case TIOCMBIS:
1823 if (arg & TIOCM_RTS)
1824 mcr |= UART_MCR_RTS;
1825 if (arg & TIOCM_DTR)
1826 mcr |= UART_MCR_RTS;
1827 if (arg & TIOCM_LOOP)
1828 mcr |= UART_MCR_LOOP;
1829 break;
1830
1831 case TIOCMBIC:
1832 if (arg & TIOCM_RTS)
1833 mcr &= ~UART_MCR_RTS;
1834 if (arg & TIOCM_DTR)
1835 mcr &= ~UART_MCR_RTS;
1836 if (arg & TIOCM_LOOP)
1837 mcr &= ~UART_MCR_LOOP;
1838 break;
1839
1840 }
1841
1842 mos7720_port->shadowMCR = mcr;
1843 write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
1844 mos7720_port->shadowMCR);
1845
1846 return 0;
1847 }
1848
get_serial_info(struct moschip_port * mos7720_port,struct serial_struct __user * retinfo)1849 static int get_serial_info(struct moschip_port *mos7720_port,
1850 struct serial_struct __user *retinfo)
1851 {
1852 struct serial_struct tmp;
1853
1854 if (!retinfo)
1855 return -EFAULT;
1856
1857 memset(&tmp, 0, sizeof(tmp));
1858
1859 tmp.type = PORT_16550A;
1860 tmp.line = mos7720_port->port->minor;
1861 tmp.port = mos7720_port->port->port_number;
1862 tmp.irq = 0;
1863 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
1864 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1865 tmp.baud_base = 9600;
1866 tmp.close_delay = 5*HZ;
1867 tmp.closing_wait = 30*HZ;
1868
1869 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1870 return -EFAULT;
1871 return 0;
1872 }
1873
mos7720_ioctl(struct tty_struct * tty,unsigned int cmd,unsigned long arg)1874 static int mos7720_ioctl(struct tty_struct *tty,
1875 unsigned int cmd, unsigned long arg)
1876 {
1877 struct usb_serial_port *port = tty->driver_data;
1878 struct moschip_port *mos7720_port;
1879
1880 mos7720_port = usb_get_serial_port_data(port);
1881 if (mos7720_port == NULL)
1882 return -ENODEV;
1883
1884 switch (cmd) {
1885 case TIOCSERGETLSR:
1886 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
1887 return get_lsr_info(tty, mos7720_port,
1888 (unsigned int __user *)arg);
1889
1890 /* FIXME: These should be using the mode methods */
1891 case TIOCMBIS:
1892 case TIOCMBIC:
1893 dev_dbg(&port->dev, "%s TIOCMSET/TIOCMBIC/TIOCMSET\n", __func__);
1894 return set_modem_info(mos7720_port, cmd,
1895 (unsigned int __user *)arg);
1896
1897 case TIOCGSERIAL:
1898 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
1899 return get_serial_info(mos7720_port,
1900 (struct serial_struct __user *)arg);
1901 }
1902
1903 return -ENOIOCTLCMD;
1904 }
1905
mos7720_startup(struct usb_serial * serial)1906 static int mos7720_startup(struct usb_serial *serial)
1907 {
1908 struct usb_device *dev;
1909 char data;
1910 u16 product;
1911 int ret_val;
1912
1913 if (serial->num_bulk_in < 2 || serial->num_bulk_out < 2) {
1914 dev_err(&serial->interface->dev, "missing bulk endpoints\n");
1915 return -ENODEV;
1916 }
1917
1918 product = le16_to_cpu(serial->dev->descriptor.idProduct);
1919 dev = serial->dev;
1920
1921 /*
1922 * The 7715 uses the first bulk in/out endpoint pair for the parallel
1923 * port, and the second for the serial port. Because the usbserial core
1924 * assumes both pairs are serial ports, we must engage in a bit of
1925 * subterfuge and swap the pointers for ports 0 and 1 in order to make
1926 * port 0 point to the serial port. However, both moschip devices use a
1927 * single interrupt-in endpoint for both ports (as mentioned a little
1928 * further down), and this endpoint was assigned to port 0. So after
1929 * the swap, we must copy the interrupt endpoint elements from port 1
1930 * (as newly assigned) to port 0, and null out port 1 pointers.
1931 */
1932 if (product == MOSCHIP_DEVICE_ID_7715) {
1933 struct usb_serial_port *tmp = serial->port[0];
1934 serial->port[0] = serial->port[1];
1935 serial->port[1] = tmp;
1936 serial->port[0]->interrupt_in_urb = tmp->interrupt_in_urb;
1937 serial->port[0]->interrupt_in_buffer = tmp->interrupt_in_buffer;
1938 serial->port[0]->interrupt_in_endpointAddress =
1939 tmp->interrupt_in_endpointAddress;
1940 serial->port[1]->interrupt_in_urb = NULL;
1941 serial->port[1]->interrupt_in_buffer = NULL;
1942
1943 if (serial->port[0]->interrupt_in_urb) {
1944 struct urb *urb = serial->port[0]->interrupt_in_urb;
1945
1946 urb->complete = mos7715_interrupt_callback;
1947 }
1948 }
1949
1950 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
1951 if (product == MOSCHIP_DEVICE_ID_7715) {
1952 ret_val = mos7715_parport_init(serial);
1953 if (ret_val < 0)
1954 return ret_val;
1955 }
1956 #endif
1957 /* start the interrupt urb */
1958 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL);
1959 if (ret_val) {
1960 dev_err(&dev->dev, "failed to submit interrupt urb: %d\n",
1961 ret_val);
1962 }
1963
1964 /* LSR For Port 1 */
1965 read_mos_reg(serial, 0, MOS7720_LSR, &data);
1966 dev_dbg(&dev->dev, "LSR:%x\n", data);
1967
1968 return 0;
1969 }
1970
mos7720_release(struct usb_serial * serial)1971 static void mos7720_release(struct usb_serial *serial)
1972 {
1973 usb_kill_urb(serial->port[0]->interrupt_in_urb);
1974
1975 #ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
1976 /* close the parallel port */
1977
1978 if (le16_to_cpu(serial->dev->descriptor.idProduct)
1979 == MOSCHIP_DEVICE_ID_7715) {
1980 struct urbtracker *urbtrack;
1981 unsigned long flags;
1982 struct mos7715_parport *mos_parport =
1983 usb_get_serial_data(serial);
1984
1985 /* prevent NULL ptr dereference in port callbacks */
1986 spin_lock(&release_lock);
1987 mos_parport->pp->private_data = NULL;
1988 spin_unlock(&release_lock);
1989
1990 /* wait for synchronous usb calls to return */
1991 if (mos_parport->msg_pending)
1992 wait_for_completion_timeout(&mos_parport->syncmsg_compl,
1993 msecs_to_jiffies(MOS_WDR_TIMEOUT));
1994
1995 parport_remove_port(mos_parport->pp);
1996 usb_set_serial_data(serial, NULL);
1997 mos_parport->serial = NULL;
1998
1999 /* if tasklet currently scheduled, wait for it to complete */
2000 tasklet_kill(&mos_parport->urb_tasklet);
2001
2002 /* unlink any urbs sent by the tasklet */
2003 spin_lock_irqsave(&mos_parport->listlock, flags);
2004 list_for_each_entry(urbtrack,
2005 &mos_parport->active_urbs,
2006 urblist_entry)
2007 usb_unlink_urb(urbtrack->urb);
2008 spin_unlock_irqrestore(&mos_parport->listlock, flags);
2009 parport_del_port(mos_parport->pp);
2010
2011 kref_put(&mos_parport->ref_count, destroy_mos_parport);
2012 }
2013 #endif
2014 }
2015
mos7720_port_probe(struct usb_serial_port * port)2016 static int mos7720_port_probe(struct usb_serial_port *port)
2017 {
2018 struct moschip_port *mos7720_port;
2019
2020 mos7720_port = kzalloc(sizeof(*mos7720_port), GFP_KERNEL);
2021 if (!mos7720_port)
2022 return -ENOMEM;
2023
2024 /* Initialize all port interrupt end point to port 0 int endpoint.
2025 * Our device has only one interrupt endpoint common to all ports.
2026 */
2027 port->interrupt_in_endpointAddress =
2028 port->serial->port[0]->interrupt_in_endpointAddress;
2029 mos7720_port->port = port;
2030
2031 usb_set_serial_port_data(port, mos7720_port);
2032
2033 return 0;
2034 }
2035
mos7720_port_remove(struct usb_serial_port * port)2036 static int mos7720_port_remove(struct usb_serial_port *port)
2037 {
2038 struct moschip_port *mos7720_port;
2039
2040 mos7720_port = usb_get_serial_port_data(port);
2041 kfree(mos7720_port);
2042
2043 return 0;
2044 }
2045
2046 static struct usb_serial_driver moschip7720_2port_driver = {
2047 .driver = {
2048 .owner = THIS_MODULE,
2049 .name = "moschip7720",
2050 },
2051 .description = "Moschip 2 port adapter",
2052 .id_table = id_table,
2053 .calc_num_ports = mos77xx_calc_num_ports,
2054 .open = mos7720_open,
2055 .close = mos7720_close,
2056 .throttle = mos7720_throttle,
2057 .unthrottle = mos7720_unthrottle,
2058 .attach = mos7720_startup,
2059 .release = mos7720_release,
2060 .port_probe = mos7720_port_probe,
2061 .port_remove = mos7720_port_remove,
2062 .ioctl = mos7720_ioctl,
2063 .tiocmget = mos7720_tiocmget,
2064 .tiocmset = mos7720_tiocmset,
2065 .set_termios = mos7720_set_termios,
2066 .write = mos7720_write,
2067 .write_room = mos7720_write_room,
2068 .chars_in_buffer = mos7720_chars_in_buffer,
2069 .break_ctl = mos7720_break,
2070 .read_bulk_callback = mos7720_bulk_in_callback,
2071 .read_int_callback = mos7720_interrupt_callback,
2072 };
2073
2074 static struct usb_serial_driver * const serial_drivers[] = {
2075 &moschip7720_2port_driver, NULL
2076 };
2077
2078 module_usb_serial_driver(serial_drivers, id_table);
2079
2080 MODULE_AUTHOR(DRIVER_AUTHOR);
2081 MODULE_DESCRIPTION(DRIVER_DESC);
2082 MODULE_LICENSE("GPL");
2083