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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * mos7720.c
4 * Controls the Moschip 7720 usb to dual port serial converter
5 *
6 * Copyright 2006 Moschip Semiconductor Tech. Ltd.
7 *
8 * Developed by:
9 * Vijaya Kumar <vijaykumar.gn@gmail.com>
10 * Ajay Kumar <naanuajay@yahoo.com>
11 * Gurudeva <ngurudeva@yahoo.com>
12 *
13 * Cleaned up from the original by:
14 * Greg Kroah-Hartman <gregkh@suse.de>
15 *
16 * Originally based on drivers/usb/serial/io_edgeport.c which is:
17 * Copyright (C) 2000 Inside Out Networks, All rights reserved.
18 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
19 */
20#include <linux/kernel.h>
21#include <linux/errno.h>
22#include <linux/slab.h>
23#include <linux/tty.h>
24#include <linux/tty_driver.h>
25#include <linux/tty_flip.h>
26#include <linux/module.h>
27#include <linux/spinlock.h>
28#include <linux/serial.h>
29#include <linux/serial_reg.h>
30#include <linux/usb.h>
31#include <linux/usb/serial.h>
32#include <linux/uaccess.h>
33#include <linux/parport.h>
34
35#define DRIVER_AUTHOR "Aspire Communications pvt Ltd."
36#define DRIVER_DESC "Moschip USB Serial Driver"
37
38/* default urb timeout */
39#define MOS_WDR_TIMEOUT 5000
40
41#define MOS_MAX_PORT 0x02
42#define MOS_WRITE 0x0E
43#define MOS_READ 0x0D
44
45/* Interrupt Routines Defines */
46#define SERIAL_IIR_RLS 0x06
47#define SERIAL_IIR_RDA 0x04
48#define SERIAL_IIR_CTI 0x0c
49#define SERIAL_IIR_THR 0x02
50#define SERIAL_IIR_MS 0x00
51
52#define NUM_URBS 16 /* URB Count */
53#define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
54
55/* This structure holds all of the local serial port information */
56struct moschip_port {
57 __u8 shadowLCR; /* last LCR value received */
58 __u8 shadowMCR; /* last MCR value received */
59 __u8 shadowMSR; /* last MSR value received */
60 char open;
61 struct usb_serial_port *port; /* loop back to the owner */
62 struct urb *write_urb_pool[NUM_URBS];
63};
64
65#define USB_VENDOR_ID_MOSCHIP 0x9710
66#define MOSCHIP_DEVICE_ID_7720 0x7720
67#define MOSCHIP_DEVICE_ID_7715 0x7715
68
69static const struct usb_device_id id_table[] = {
70 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7720) },
71 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7715) },
72 { } /* terminating entry */
73};
74MODULE_DEVICE_TABLE(usb, id_table);
75
76#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
77
78/* initial values for parport regs */
79#define DCR_INIT_VAL 0x0c /* SLCTIN, nINIT */
80#define ECR_INIT_VAL 0x00 /* SPP mode */
81
82enum mos7715_pp_modes {
83 SPP = 0<<5,
84 PS2 = 1<<5, /* moschip calls this 'NIBBLE' mode */
85 PPF = 2<<5, /* moschip calls this 'CB-FIFO mode */
86};
87
88struct mos7715_parport {
89 struct parport *pp; /* back to containing struct */
90 struct kref ref_count; /* to instance of this struct */
91 bool msg_pending; /* usb sync call pending */
92 struct completion syncmsg_compl; /* usb sync call completed */
93 struct work_struct work; /* restore deferred writes */
94 struct usb_serial *serial; /* back to containing struct */
95 __u8 shadowECR; /* parallel port regs... */
96 __u8 shadowDCR;
97 atomic_t shadowDSR; /* updated in int-in callback */
98};
99
100/* lock guards against dereferencing NULL ptr in parport ops callbacks */
101static DEFINE_SPINLOCK(release_lock);
102
103#endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
104
105static const unsigned int dummy; /* for clarity in register access fns */
106
107enum mos_regs {
108 MOS7720_THR, /* serial port regs */
109 MOS7720_RHR,
110 MOS7720_IER,
111 MOS7720_FCR,
112 MOS7720_ISR,
113 MOS7720_LCR,
114 MOS7720_MCR,
115 MOS7720_LSR,
116 MOS7720_MSR,
117 MOS7720_SPR,
118 MOS7720_DLL,
119 MOS7720_DLM,
120 MOS7720_DPR, /* parallel port regs */
121 MOS7720_DSR,
122 MOS7720_DCR,
123 MOS7720_ECR,
124 MOS7720_SP1_REG, /* device control regs */
125 MOS7720_SP2_REG, /* serial port 2 (7720 only) */
126 MOS7720_PP_REG,
127 MOS7720_SP_CONTROL_REG,
128};
129
130/*
131 * Return the correct value for the Windex field of the setup packet
132 * for a control endpoint message. See the 7715 datasheet.
133 */
134static inline __u16 get_reg_index(enum mos_regs reg)
135{
136 static const __u16 mos7715_index_lookup_table[] = {
137 0x00, /* MOS7720_THR */
138 0x00, /* MOS7720_RHR */
139 0x01, /* MOS7720_IER */
140 0x02, /* MOS7720_FCR */
141 0x02, /* MOS7720_ISR */
142 0x03, /* MOS7720_LCR */
143 0x04, /* MOS7720_MCR */
144 0x05, /* MOS7720_LSR */
145 0x06, /* MOS7720_MSR */
146 0x07, /* MOS7720_SPR */
147 0x00, /* MOS7720_DLL */
148 0x01, /* MOS7720_DLM */
149 0x00, /* MOS7720_DPR */
150 0x01, /* MOS7720_DSR */
151 0x02, /* MOS7720_DCR */
152 0x0a, /* MOS7720_ECR */
153 0x01, /* MOS7720_SP1_REG */
154 0x02, /* MOS7720_SP2_REG (7720 only) */
155 0x04, /* MOS7720_PP_REG (7715 only) */
156 0x08, /* MOS7720_SP_CONTROL_REG */
157 };
158 return mos7715_index_lookup_table[reg];
159}
160
161/*
162 * Return the correct value for the upper byte of the Wvalue field of
163 * the setup packet for a control endpoint message.
164 */
165static inline __u16 get_reg_value(enum mos_regs reg,
166 unsigned int serial_portnum)
167{
168 if (reg >= MOS7720_SP1_REG) /* control reg */
169 return 0x0000;
170
171 else if (reg >= MOS7720_DPR) /* parallel port reg (7715 only) */
172 return 0x0100;
173
174 else /* serial port reg */
175 return (serial_portnum + 2) << 8;
176}
177
178/*
179 * Write data byte to the specified device register. The data is embedded in
180 * the value field of the setup packet. serial_portnum is ignored for registers
181 * not specific to a particular serial port.
182 */
183static int write_mos_reg(struct usb_serial *serial, unsigned int serial_portnum,
184 enum mos_regs reg, __u8 data)
185{
186 struct usb_device *usbdev = serial->dev;
187 unsigned int pipe = usb_sndctrlpipe(usbdev, 0);
188 __u8 request = (__u8)0x0e;
189 __u8 requesttype = (__u8)0x40;
190 __u16 index = get_reg_index(reg);
191 __u16 value = get_reg_value(reg, serial_portnum) + data;
192 int status = usb_control_msg(usbdev, pipe, request, requesttype, value,
193 index, NULL, 0, MOS_WDR_TIMEOUT);
194 if (status < 0)
195 dev_err(&usbdev->dev,
196 "mos7720: usb_control_msg() failed: %d\n", status);
197 return status;
198}
199
200/*
201 * Read data byte from the specified device register. The data returned by the
202 * device is embedded in the value field of the setup packet. serial_portnum is
203 * ignored for registers that are not specific to a particular serial port.
204 */
205static int read_mos_reg(struct usb_serial *serial, unsigned int serial_portnum,
206 enum mos_regs reg, __u8 *data)
207{
208 struct usb_device *usbdev = serial->dev;
209 unsigned int pipe = usb_rcvctrlpipe(usbdev, 0);
210 __u8 request = (__u8)0x0d;
211 __u8 requesttype = (__u8)0xc0;
212 __u16 index = get_reg_index(reg);
213 __u16 value = get_reg_value(reg, serial_portnum);
214 u8 *buf;
215 int status;
216
217 buf = kmalloc(1, GFP_KERNEL);
218 if (!buf) {
219 *data = 0;
220 return -ENOMEM;
221 }
222
223 status = usb_control_msg(usbdev, pipe, request, requesttype, value,
224 index, buf, 1, MOS_WDR_TIMEOUT);
225 if (status == 1) {
226 *data = *buf;
227 } else {
228 dev_err(&usbdev->dev,
229 "mos7720: usb_control_msg() failed: %d\n", status);
230 if (status >= 0)
231 status = -EIO;
232 *data = 0;
233 }
234
235 kfree(buf);
236
237 return status;
238}
239
240#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
241
242static inline int mos7715_change_mode(struct mos7715_parport *mos_parport,
243 enum mos7715_pp_modes mode)
244{
245 mos_parport->shadowECR = mode;
246 write_mos_reg(mos_parport->serial, dummy, MOS7720_ECR,
247 mos_parport->shadowECR);
248 return 0;
249}
250
251static void destroy_mos_parport(struct kref *kref)
252{
253 struct mos7715_parport *mos_parport =
254 container_of(kref, struct mos7715_parport, ref_count);
255
256 kfree(mos_parport);
257}
258
259/*
260 * This is the common top part of all parallel port callback operations that
261 * send synchronous messages to the device. This implements convoluted locking
262 * that avoids two scenarios: (1) a port operation is called after usbserial
263 * has called our release function, at which point struct mos7715_parport has
264 * been destroyed, and (2) the device has been disconnected, but usbserial has
265 * not called the release function yet because someone has a serial port open.
266 * The shared release_lock prevents the first, and the mutex and disconnected
267 * flag maintained by usbserial covers the second. We also use the msg_pending
268 * flag to ensure that all synchronous usb message calls have completed before
269 * our release function can return.
270 */
271static int parport_prologue(struct parport *pp)
272{
273 struct mos7715_parport *mos_parport;
274
275 spin_lock(&release_lock);
276 mos_parport = pp->private_data;
277 if (unlikely(mos_parport == NULL)) {
278 /* release fn called, port struct destroyed */
279 spin_unlock(&release_lock);
280 return -1;
281 }
282 mos_parport->msg_pending = true; /* synch usb call pending */
283 reinit_completion(&mos_parport->syncmsg_compl);
284 spin_unlock(&release_lock);
285
286 /* ensure writes from restore are submitted before new requests */
287 if (work_pending(&mos_parport->work))
288 flush_work(&mos_parport->work);
289
290 mutex_lock(&mos_parport->serial->disc_mutex);
291 if (mos_parport->serial->disconnected) {
292 /* device disconnected */
293 mutex_unlock(&mos_parport->serial->disc_mutex);
294 mos_parport->msg_pending = false;
295 complete(&mos_parport->syncmsg_compl);
296 return -1;
297 }
298
299 return 0;
300}
301
302/*
303 * This is the common bottom part of all parallel port functions that send
304 * synchronous messages to the device.
305 */
306static inline void parport_epilogue(struct parport *pp)
307{
308 struct mos7715_parport *mos_parport = pp->private_data;
309 mutex_unlock(&mos_parport->serial->disc_mutex);
310 mos_parport->msg_pending = false;
311 complete(&mos_parport->syncmsg_compl);
312}
313
314static void deferred_restore_writes(struct work_struct *work)
315{
316 struct mos7715_parport *mos_parport;
317
318 mos_parport = container_of(work, struct mos7715_parport, work);
319
320 mutex_lock(&mos_parport->serial->disc_mutex);
321
322 /* if device disconnected, game over */
323 if (mos_parport->serial->disconnected)
324 goto done;
325
326 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
327 mos_parport->shadowDCR);
328 write_mos_reg(mos_parport->serial, dummy, MOS7720_ECR,
329 mos_parport->shadowECR);
330done:
331 mutex_unlock(&mos_parport->serial->disc_mutex);
332}
333
334static void parport_mos7715_write_data(struct parport *pp, unsigned char d)
335{
336 struct mos7715_parport *mos_parport = pp->private_data;
337
338 if (parport_prologue(pp) < 0)
339 return;
340 mos7715_change_mode(mos_parport, SPP);
341 write_mos_reg(mos_parport->serial, dummy, MOS7720_DPR, (__u8)d);
342 parport_epilogue(pp);
343}
344
345static unsigned char parport_mos7715_read_data(struct parport *pp)
346{
347 struct mos7715_parport *mos_parport = pp->private_data;
348 unsigned char d;
349
350 if (parport_prologue(pp) < 0)
351 return 0;
352 read_mos_reg(mos_parport->serial, dummy, MOS7720_DPR, &d);
353 parport_epilogue(pp);
354 return d;
355}
356
357static void parport_mos7715_write_control(struct parport *pp, unsigned char d)
358{
359 struct mos7715_parport *mos_parport = pp->private_data;
360 __u8 data;
361
362 if (parport_prologue(pp) < 0)
363 return;
364 data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0);
365 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, data);
366 mos_parport->shadowDCR = data;
367 parport_epilogue(pp);
368}
369
370static unsigned char parport_mos7715_read_control(struct parport *pp)
371{
372 struct mos7715_parport *mos_parport;
373 __u8 dcr;
374
375 spin_lock(&release_lock);
376 mos_parport = pp->private_data;
377 if (unlikely(mos_parport == NULL)) {
378 spin_unlock(&release_lock);
379 return 0;
380 }
381 dcr = mos_parport->shadowDCR & 0x0f;
382 spin_unlock(&release_lock);
383 return dcr;
384}
385
386static unsigned char parport_mos7715_frob_control(struct parport *pp,
387 unsigned char mask,
388 unsigned char val)
389{
390 struct mos7715_parport *mos_parport = pp->private_data;
391 __u8 dcr;
392
393 mask &= 0x0f;
394 val &= 0x0f;
395 if (parport_prologue(pp) < 0)
396 return 0;
397 mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val;
398 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
399 mos_parport->shadowDCR);
400 dcr = mos_parport->shadowDCR & 0x0f;
401 parport_epilogue(pp);
402 return dcr;
403}
404
405static unsigned char parport_mos7715_read_status(struct parport *pp)
406{
407 unsigned char status;
408 struct mos7715_parport *mos_parport;
409
410 spin_lock(&release_lock);
411 mos_parport = pp->private_data;
412 if (unlikely(mos_parport == NULL)) { /* release called */
413 spin_unlock(&release_lock);
414 return 0;
415 }
416 status = atomic_read(&mos_parport->shadowDSR) & 0xf8;
417 spin_unlock(&release_lock);
418 return status;
419}
420
421static void parport_mos7715_enable_irq(struct parport *pp)
422{
423}
424
425static void parport_mos7715_disable_irq(struct parport *pp)
426{
427}
428
429static void parport_mos7715_data_forward(struct parport *pp)
430{
431 struct mos7715_parport *mos_parport = pp->private_data;
432
433 if (parport_prologue(pp) < 0)
434 return;
435 mos7715_change_mode(mos_parport, PS2);
436 mos_parport->shadowDCR &= ~0x20;
437 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
438 mos_parport->shadowDCR);
439 parport_epilogue(pp);
440}
441
442static void parport_mos7715_data_reverse(struct parport *pp)
443{
444 struct mos7715_parport *mos_parport = pp->private_data;
445
446 if (parport_prologue(pp) < 0)
447 return;
448 mos7715_change_mode(mos_parport, PS2);
449 mos_parport->shadowDCR |= 0x20;
450 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
451 mos_parport->shadowDCR);
452 parport_epilogue(pp);
453}
454
455static void parport_mos7715_init_state(struct pardevice *dev,
456 struct parport_state *s)
457{
458 s->u.pc.ctr = DCR_INIT_VAL;
459 s->u.pc.ecr = ECR_INIT_VAL;
460}
461
462/* N.B. Parport core code requires that this function not block */
463static void parport_mos7715_save_state(struct parport *pp,
464 struct parport_state *s)
465{
466 struct mos7715_parport *mos_parport;
467
468 spin_lock(&release_lock);
469 mos_parport = pp->private_data;
470 if (unlikely(mos_parport == NULL)) { /* release called */
471 spin_unlock(&release_lock);
472 return;
473 }
474 s->u.pc.ctr = mos_parport->shadowDCR;
475 s->u.pc.ecr = mos_parport->shadowECR;
476 spin_unlock(&release_lock);
477}
478
479/* N.B. Parport core code requires that this function not block */
480static void parport_mos7715_restore_state(struct parport *pp,
481 struct parport_state *s)
482{
483 struct mos7715_parport *mos_parport;
484
485 spin_lock(&release_lock);
486 mos_parport = pp->private_data;
487 if (unlikely(mos_parport == NULL)) { /* release called */
488 spin_unlock(&release_lock);
489 return;
490 }
491 mos_parport->shadowDCR = s->u.pc.ctr;
492 mos_parport->shadowECR = s->u.pc.ecr;
493
494 schedule_work(&mos_parport->work);
495 spin_unlock(&release_lock);
496}
497
498static size_t parport_mos7715_write_compat(struct parport *pp,
499 const void *buffer,
500 size_t len, int flags)
501{
502 int retval;
503 struct mos7715_parport *mos_parport = pp->private_data;
504 int actual_len;
505
506 if (parport_prologue(pp) < 0)
507 return 0;
508 mos7715_change_mode(mos_parport, PPF);
509 retval = usb_bulk_msg(mos_parport->serial->dev,
510 usb_sndbulkpipe(mos_parport->serial->dev, 2),
511 (void *)buffer, len, &actual_len,
512 MOS_WDR_TIMEOUT);
513 parport_epilogue(pp);
514 if (retval) {
515 dev_err(&mos_parport->serial->dev->dev,
516 "mos7720: usb_bulk_msg() failed: %d\n", retval);
517 return 0;
518 }
519 return actual_len;
520}
521
522static struct parport_operations parport_mos7715_ops = {
523 .owner = THIS_MODULE,
524 .write_data = parport_mos7715_write_data,
525 .read_data = parport_mos7715_read_data,
526
527 .write_control = parport_mos7715_write_control,
528 .read_control = parport_mos7715_read_control,
529 .frob_control = parport_mos7715_frob_control,
530
531 .read_status = parport_mos7715_read_status,
532
533 .enable_irq = parport_mos7715_enable_irq,
534 .disable_irq = parport_mos7715_disable_irq,
535
536 .data_forward = parport_mos7715_data_forward,
537 .data_reverse = parport_mos7715_data_reverse,
538
539 .init_state = parport_mos7715_init_state,
540 .save_state = parport_mos7715_save_state,
541 .restore_state = parport_mos7715_restore_state,
542
543 .compat_write_data = parport_mos7715_write_compat,
544
545 .nibble_read_data = parport_ieee1284_read_nibble,
546 .byte_read_data = parport_ieee1284_read_byte,
547};
548
549/*
550 * Allocate and initialize parallel port control struct, initialize
551 * the parallel port hardware device, and register with the parport subsystem.
552 */
553static int mos7715_parport_init(struct usb_serial *serial)
554{
555 struct mos7715_parport *mos_parport;
556
557 /* allocate and initialize parallel port control struct */
558 mos_parport = kzalloc(sizeof(struct mos7715_parport), GFP_KERNEL);
559 if (!mos_parport)
560 return -ENOMEM;
561
562 mos_parport->msg_pending = false;
563 kref_init(&mos_parport->ref_count);
564 usb_set_serial_data(serial, mos_parport); /* hijack private pointer */
565 mos_parport->serial = serial;
566 INIT_WORK(&mos_parport->work, deferred_restore_writes);
567 init_completion(&mos_parport->syncmsg_compl);
568
569 /* cycle parallel port reset bit */
570 write_mos_reg(mos_parport->serial, dummy, MOS7720_PP_REG, (__u8)0x80);
571 write_mos_reg(mos_parport->serial, dummy, MOS7720_PP_REG, (__u8)0x00);
572
573 /* initialize device registers */
574 mos_parport->shadowDCR = DCR_INIT_VAL;
575 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
576 mos_parport->shadowDCR);
577 mos_parport->shadowECR = ECR_INIT_VAL;
578 write_mos_reg(mos_parport->serial, dummy, MOS7720_ECR,
579 mos_parport->shadowECR);
580
581 /* register with parport core */
582 mos_parport->pp = parport_register_port(0, PARPORT_IRQ_NONE,
583 PARPORT_DMA_NONE,
584 &parport_mos7715_ops);
585 if (mos_parport->pp == NULL) {
586 dev_err(&serial->interface->dev,
587 "Could not register parport\n");
588 kref_put(&mos_parport->ref_count, destroy_mos_parport);
589 return -EIO;
590 }
591 mos_parport->pp->private_data = mos_parport;
592 mos_parport->pp->modes = PARPORT_MODE_COMPAT | PARPORT_MODE_PCSPP;
593 mos_parport->pp->dev = &serial->interface->dev;
594 parport_announce_port(mos_parport->pp);
595
596 return 0;
597}
598#endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
599
600/*
601 * mos7720_interrupt_callback
602 * this is the callback function for when we have received data on the
603 * interrupt endpoint.
604 */
605static void mos7720_interrupt_callback(struct urb *urb)
606{
607 int result;
608 int length;
609 int status = urb->status;
610 struct device *dev = &urb->dev->dev;
611 __u8 *data;
612 __u8 sp1;
613 __u8 sp2;
614
615 switch (status) {
616 case 0:
617 /* success */
618 break;
619 case -ECONNRESET:
620 case -ENOENT:
621 case -ESHUTDOWN:
622 /* this urb is terminated, clean up */
623 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
624 return;
625 default:
626 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
627 goto exit;
628 }
629
630 length = urb->actual_length;
631 data = urb->transfer_buffer;
632
633 /* Moschip get 4 bytes
634 * Byte 1 IIR Port 1 (port.number is 0)
635 * Byte 2 IIR Port 2 (port.number is 1)
636 * Byte 3 --------------
637 * Byte 4 FIFO status for both */
638
639 /* the above description is inverted
640 * oneukum 2007-03-14 */
641
642 if (unlikely(length != 4)) {
643 dev_dbg(dev, "Wrong data !!!\n");
644 return;
645 }
646
647 sp1 = data[3];
648 sp2 = data[2];
649
650 if ((sp1 | sp2) & 0x01) {
651 /* No Interrupt Pending in both the ports */
652 dev_dbg(dev, "No Interrupt !!!\n");
653 } else {
654 switch (sp1 & 0x0f) {
655 case SERIAL_IIR_RLS:
656 dev_dbg(dev, "Serial Port 1: Receiver status error or address bit detected in 9-bit mode\n");
657 break;
658 case SERIAL_IIR_CTI:
659 dev_dbg(dev, "Serial Port 1: Receiver time out\n");
660 break;
661 case SERIAL_IIR_MS:
662 /* dev_dbg(dev, "Serial Port 1: Modem status change\n"); */
663 break;
664 }
665
666 switch (sp2 & 0x0f) {
667 case SERIAL_IIR_RLS:
668 dev_dbg(dev, "Serial Port 2: Receiver status error or address bit detected in 9-bit mode\n");
669 break;
670 case SERIAL_IIR_CTI:
671 dev_dbg(dev, "Serial Port 2: Receiver time out\n");
672 break;
673 case SERIAL_IIR_MS:
674 /* dev_dbg(dev, "Serial Port 2: Modem status change\n"); */
675 break;
676 }
677 }
678
679exit:
680 result = usb_submit_urb(urb, GFP_ATOMIC);
681 if (result)
682 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result);
683}
684
685/*
686 * mos7715_interrupt_callback
687 * this is the 7715's callback function for when we have received data on
688 * the interrupt endpoint.
689 */
690static void mos7715_interrupt_callback(struct urb *urb)
691{
692 int result;
693 int length;
694 int status = urb->status;
695 struct device *dev = &urb->dev->dev;
696 __u8 *data;
697 __u8 iir;
698
699 switch (status) {
700 case 0:
701 /* success */
702 break;
703 case -ECONNRESET:
704 case -ENOENT:
705 case -ESHUTDOWN:
706 case -ENODEV:
707 /* this urb is terminated, clean up */
708 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
709 return;
710 default:
711 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
712 goto exit;
713 }
714
715 length = urb->actual_length;
716 data = urb->transfer_buffer;
717
718 /* Structure of data from 7715 device:
719 * Byte 1: IIR serial Port
720 * Byte 2: unused
721 * Byte 2: DSR parallel port
722 * Byte 4: FIFO status for both */
723
724 if (unlikely(length != 4)) {
725 dev_dbg(dev, "Wrong data !!!\n");
726 return;
727 }
728
729 iir = data[0];
730 if (!(iir & 0x01)) { /* serial port interrupt pending */
731 switch (iir & 0x0f) {
732 case SERIAL_IIR_RLS:
733 dev_dbg(dev, "Serial Port: Receiver status error or address bit detected in 9-bit mode\n");
734 break;
735 case SERIAL_IIR_CTI:
736 dev_dbg(dev, "Serial Port: Receiver time out\n");
737 break;
738 case SERIAL_IIR_MS:
739 /* dev_dbg(dev, "Serial Port: Modem status change\n"); */
740 break;
741 }
742 }
743
744#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
745 { /* update local copy of DSR reg */
746 struct usb_serial_port *port = urb->context;
747 struct mos7715_parport *mos_parport = port->serial->private;
748 if (unlikely(mos_parport == NULL))
749 return;
750 atomic_set(&mos_parport->shadowDSR, data[2]);
751 }
752#endif
753
754exit:
755 result = usb_submit_urb(urb, GFP_ATOMIC);
756 if (result)
757 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result);
758}
759
760/*
761 * mos7720_bulk_in_callback
762 * this is the callback function for when we have received data on the
763 * bulk in endpoint.
764 */
765static void mos7720_bulk_in_callback(struct urb *urb)
766{
767 int retval;
768 unsigned char *data ;
769 struct usb_serial_port *port;
770 int status = urb->status;
771
772 if (status) {
773 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
774 return;
775 }
776
777 port = urb->context;
778
779 dev_dbg(&port->dev, "Entering...%s\n", __func__);
780
781 data = urb->transfer_buffer;
782
783 if (urb->actual_length) {
784 tty_insert_flip_string(&port->port, data, urb->actual_length);
785 tty_flip_buffer_push(&port->port);
786 }
787
788 if (port->read_urb->status != -EINPROGRESS) {
789 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
790 if (retval)
791 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
792 }
793}
794
795/*
796 * mos7720_bulk_out_data_callback
797 * this is the callback function for when we have finished sending serial
798 * data on the bulk out endpoint.
799 */
800static void mos7720_bulk_out_data_callback(struct urb *urb)
801{
802 struct moschip_port *mos7720_port;
803 int status = urb->status;
804
805 if (status) {
806 dev_dbg(&urb->dev->dev, "nonzero write bulk status received:%d\n", status);
807 return;
808 }
809
810 mos7720_port = urb->context;
811 if (!mos7720_port) {
812 dev_dbg(&urb->dev->dev, "NULL mos7720_port pointer\n");
813 return ;
814 }
815
816 if (mos7720_port->open)
817 tty_port_tty_wakeup(&mos7720_port->port->port);
818}
819
820static int mos77xx_calc_num_ports(struct usb_serial *serial,
821 struct usb_serial_endpoints *epds)
822{
823 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
824
825 if (product == MOSCHIP_DEVICE_ID_7715) {
826 /*
827 * The 7715 uses the first bulk in/out endpoint pair for the
828 * parallel port, and the second for the serial port. We swap
829 * the endpoint descriptors here so that the first and
830 * only registered port structure uses the serial-port
831 * endpoints.
832 */
833 swap(epds->bulk_in[0], epds->bulk_in[1]);
834 swap(epds->bulk_out[0], epds->bulk_out[1]);
835
836 return 1;
837 }
838
839 return 2;
840}
841
842static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port)
843{
844 struct usb_serial *serial;
845 struct urb *urb;
846 struct moschip_port *mos7720_port;
847 int response;
848 int port_number;
849 __u8 data;
850 int allocated_urbs = 0;
851 int j;
852
853 serial = port->serial;
854
855 mos7720_port = usb_get_serial_port_data(port);
856 if (mos7720_port == NULL)
857 return -ENODEV;
858
859 usb_clear_halt(serial->dev, port->write_urb->pipe);
860 usb_clear_halt(serial->dev, port->read_urb->pipe);
861
862 /* Initialising the write urb pool */
863 for (j = 0; j < NUM_URBS; ++j) {
864 urb = usb_alloc_urb(0, GFP_KERNEL);
865 mos7720_port->write_urb_pool[j] = urb;
866 if (!urb)
867 continue;
868
869 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
870 GFP_KERNEL);
871 if (!urb->transfer_buffer) {
872 usb_free_urb(mos7720_port->write_urb_pool[j]);
873 mos7720_port->write_urb_pool[j] = NULL;
874 continue;
875 }
876 allocated_urbs++;
877 }
878
879 if (!allocated_urbs)
880 return -ENOMEM;
881
882 /* Initialize MCS7720 -- Write Init values to corresponding Registers
883 *
884 * Register Index
885 * 0 : MOS7720_THR/MOS7720_RHR
886 * 1 : MOS7720_IER
887 * 2 : MOS7720_FCR
888 * 3 : MOS7720_LCR
889 * 4 : MOS7720_MCR
890 * 5 : MOS7720_LSR
891 * 6 : MOS7720_MSR
892 * 7 : MOS7720_SPR
893 *
894 * 0x08 : SP1/2 Control Reg
895 */
896 port_number = port->port_number;
897 read_mos_reg(serial, port_number, MOS7720_LSR, &data);
898
899 dev_dbg(&port->dev, "SS::%p LSR:%x\n", mos7720_port, data);
900
901 write_mos_reg(serial, dummy, MOS7720_SP1_REG, 0x02);
902 write_mos_reg(serial, dummy, MOS7720_SP2_REG, 0x02);
903
904 write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
905 write_mos_reg(serial, port_number, MOS7720_FCR, 0x00);
906
907 write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf);
908 mos7720_port->shadowLCR = 0x03;
909 write_mos_reg(serial, port_number, MOS7720_LCR,
910 mos7720_port->shadowLCR);
911 mos7720_port->shadowMCR = 0x0b;
912 write_mos_reg(serial, port_number, MOS7720_MCR,
913 mos7720_port->shadowMCR);
914
915 write_mos_reg(serial, port_number, MOS7720_SP_CONTROL_REG, 0x00);
916 read_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, &data);
917 data = data | (port->port_number + 1);
918 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, data);
919 mos7720_port->shadowLCR = 0x83;
920 write_mos_reg(serial, port_number, MOS7720_LCR,
921 mos7720_port->shadowLCR);
922 write_mos_reg(serial, port_number, MOS7720_THR, 0x0c);
923 write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
924 mos7720_port->shadowLCR = 0x03;
925 write_mos_reg(serial, port_number, MOS7720_LCR,
926 mos7720_port->shadowLCR);
927 write_mos_reg(serial, port_number, MOS7720_IER, 0x0c);
928
929 response = usb_submit_urb(port->read_urb, GFP_KERNEL);
930 if (response)
931 dev_err(&port->dev, "%s - Error %d submitting read urb\n",
932 __func__, response);
933
934 /* initialize our port settings */
935 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */
936
937 /* send a open port command */
938 mos7720_port->open = 1;
939
940 return 0;
941}
942
943/*
944 * mos7720_chars_in_buffer
945 * this function is called by the tty driver when it wants to know how many
946 * bytes of data we currently have outstanding in the port (data that has
947 * been written, but hasn't made it out the port yet)
948 */
949static unsigned int mos7720_chars_in_buffer(struct tty_struct *tty)
950{
951 struct usb_serial_port *port = tty->driver_data;
952 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
953 int i;
954 unsigned int chars = 0;
955
956 for (i = 0; i < NUM_URBS; ++i) {
957 if (mos7720_port->write_urb_pool[i] &&
958 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS)
959 chars += URB_TRANSFER_BUFFER_SIZE;
960 }
961 dev_dbg(&port->dev, "%s - returns %u\n", __func__, chars);
962 return chars;
963}
964
965static void mos7720_close(struct usb_serial_port *port)
966{
967 struct usb_serial *serial;
968 struct moschip_port *mos7720_port;
969 int j;
970
971 serial = port->serial;
972
973 mos7720_port = usb_get_serial_port_data(port);
974 if (mos7720_port == NULL)
975 return;
976
977 for (j = 0; j < NUM_URBS; ++j)
978 usb_kill_urb(mos7720_port->write_urb_pool[j]);
979
980 /* Freeing Write URBs */
981 for (j = 0; j < NUM_URBS; ++j) {
982 if (mos7720_port->write_urb_pool[j]) {
983 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer);
984 usb_free_urb(mos7720_port->write_urb_pool[j]);
985 }
986 }
987
988 /* While closing port, shutdown all bulk read, write *
989 * and interrupt read if they exists, otherwise nop */
990 usb_kill_urb(port->write_urb);
991 usb_kill_urb(port->read_urb);
992
993 write_mos_reg(serial, port->port_number, MOS7720_MCR, 0x00);
994 write_mos_reg(serial, port->port_number, MOS7720_IER, 0x00);
995
996 mos7720_port->open = 0;
997}
998
999static int mos7720_break(struct tty_struct *tty, int break_state)
1000{
1001 struct usb_serial_port *port = tty->driver_data;
1002 unsigned char data;
1003 struct usb_serial *serial;
1004 struct moschip_port *mos7720_port;
1005
1006 serial = port->serial;
1007
1008 mos7720_port = usb_get_serial_port_data(port);
1009 if (mos7720_port == NULL)
1010 return -ENODEV;
1011
1012 if (break_state == -1)
1013 data = mos7720_port->shadowLCR | UART_LCR_SBC;
1014 else
1015 data = mos7720_port->shadowLCR & ~UART_LCR_SBC;
1016
1017 mos7720_port->shadowLCR = data;
1018
1019 return write_mos_reg(serial, port->port_number, MOS7720_LCR,
1020 mos7720_port->shadowLCR);
1021}
1022
1023/*
1024 * mos7720_write_room
1025 * this function is called by the tty driver when it wants to know how many
1026 * bytes of data we can accept for a specific port.
1027 */
1028static unsigned int mos7720_write_room(struct tty_struct *tty)
1029{
1030 struct usb_serial_port *port = tty->driver_data;
1031 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1032 unsigned int room = 0;
1033 int i;
1034
1035 /* FIXME: Locking */
1036 for (i = 0; i < NUM_URBS; ++i) {
1037 if (mos7720_port->write_urb_pool[i] &&
1038 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS)
1039 room += URB_TRANSFER_BUFFER_SIZE;
1040 }
1041
1042 dev_dbg(&port->dev, "%s - returns %u\n", __func__, room);
1043 return room;
1044}
1045
1046static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port,
1047 const unsigned char *data, int count)
1048{
1049 int status;
1050 int i;
1051 int bytes_sent = 0;
1052 int transfer_size;
1053
1054 struct moschip_port *mos7720_port;
1055 struct usb_serial *serial;
1056 struct urb *urb;
1057 const unsigned char *current_position = data;
1058
1059 serial = port->serial;
1060
1061 mos7720_port = usb_get_serial_port_data(port);
1062 if (mos7720_port == NULL)
1063 return -ENODEV;
1064
1065 /* try to find a free urb in the list */
1066 urb = NULL;
1067
1068 for (i = 0; i < NUM_URBS; ++i) {
1069 if (mos7720_port->write_urb_pool[i] &&
1070 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) {
1071 urb = mos7720_port->write_urb_pool[i];
1072 dev_dbg(&port->dev, "URB:%d\n", i);
1073 break;
1074 }
1075 }
1076
1077 if (urb == NULL) {
1078 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1079 goto exit;
1080 }
1081
1082 if (urb->transfer_buffer == NULL) {
1083 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1084 GFP_ATOMIC);
1085 if (!urb->transfer_buffer) {
1086 bytes_sent = -ENOMEM;
1087 goto exit;
1088 }
1089 }
1090 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1091
1092 memcpy(urb->transfer_buffer, current_position, transfer_size);
1093 usb_serial_debug_data(&port->dev, __func__, transfer_size,
1094 urb->transfer_buffer);
1095
1096 /* fill urb with data and submit */
1097 usb_fill_bulk_urb(urb, serial->dev,
1098 usb_sndbulkpipe(serial->dev,
1099 port->bulk_out_endpointAddress),
1100 urb->transfer_buffer, transfer_size,
1101 mos7720_bulk_out_data_callback, mos7720_port);
1102
1103 /* send it down the pipe */
1104 status = usb_submit_urb(urb, GFP_ATOMIC);
1105 if (status) {
1106 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1107 "with status = %d\n", __func__, status);
1108 bytes_sent = status;
1109 goto exit;
1110 }
1111 bytes_sent = transfer_size;
1112
1113exit:
1114 return bytes_sent;
1115}
1116
1117static void mos7720_throttle(struct tty_struct *tty)
1118{
1119 struct usb_serial_port *port = tty->driver_data;
1120 struct moschip_port *mos7720_port;
1121 int status;
1122
1123 mos7720_port = usb_get_serial_port_data(port);
1124
1125 if (mos7720_port == NULL)
1126 return;
1127
1128 if (!mos7720_port->open) {
1129 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1130 return;
1131 }
1132
1133 /* if we are implementing XON/XOFF, send the stop character */
1134 if (I_IXOFF(tty)) {
1135 unsigned char stop_char = STOP_CHAR(tty);
1136 status = mos7720_write(tty, port, &stop_char, 1);
1137 if (status <= 0)
1138 return;
1139 }
1140
1141 /* if we are implementing RTS/CTS, toggle that line */
1142 if (C_CRTSCTS(tty)) {
1143 mos7720_port->shadowMCR &= ~UART_MCR_RTS;
1144 write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
1145 mos7720_port->shadowMCR);
1146 }
1147}
1148
1149static void mos7720_unthrottle(struct tty_struct *tty)
1150{
1151 struct usb_serial_port *port = tty->driver_data;
1152 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1153 int status;
1154
1155 if (mos7720_port == NULL)
1156 return;
1157
1158 if (!mos7720_port->open) {
1159 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1160 return;
1161 }
1162
1163 /* if we are implementing XON/XOFF, send the start character */
1164 if (I_IXOFF(tty)) {
1165 unsigned char start_char = START_CHAR(tty);
1166 status = mos7720_write(tty, port, &start_char, 1);
1167 if (status <= 0)
1168 return;
1169 }
1170
1171 /* if we are implementing RTS/CTS, toggle that line */
1172 if (C_CRTSCTS(tty)) {
1173 mos7720_port->shadowMCR |= UART_MCR_RTS;
1174 write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
1175 mos7720_port->shadowMCR);
1176 }
1177}
1178
1179/* FIXME: this function does not work */
1180static int set_higher_rates(struct moschip_port *mos7720_port,
1181 unsigned int baud)
1182{
1183 struct usb_serial_port *port;
1184 struct usb_serial *serial;
1185 int port_number;
1186 enum mos_regs sp_reg;
1187 if (mos7720_port == NULL)
1188 return -EINVAL;
1189
1190 port = mos7720_port->port;
1191 serial = port->serial;
1192
1193 /***********************************************
1194 * Init Sequence for higher rates
1195 ***********************************************/
1196 dev_dbg(&port->dev, "Sending Setting Commands ..........\n");
1197 port_number = port->port_number;
1198
1199 write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
1200 write_mos_reg(serial, port_number, MOS7720_FCR, 0x00);
1201 write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf);
1202 mos7720_port->shadowMCR = 0x0b;
1203 write_mos_reg(serial, port_number, MOS7720_MCR,
1204 mos7720_port->shadowMCR);
1205 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 0x00);
1206
1207 /***********************************************
1208 * Set for higher rates *
1209 ***********************************************/
1210 /* writing baud rate verbatum into uart clock field clearly not right */
1211 if (port_number == 0)
1212 sp_reg = MOS7720_SP1_REG;
1213 else
1214 sp_reg = MOS7720_SP2_REG;
1215 write_mos_reg(serial, dummy, sp_reg, baud * 0x10);
1216 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 0x03);
1217 mos7720_port->shadowMCR = 0x2b;
1218 write_mos_reg(serial, port_number, MOS7720_MCR,
1219 mos7720_port->shadowMCR);
1220
1221 /***********************************************
1222 * Set DLL/DLM
1223 ***********************************************/
1224 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1225 write_mos_reg(serial, port_number, MOS7720_LCR,
1226 mos7720_port->shadowLCR);
1227 write_mos_reg(serial, port_number, MOS7720_DLL, 0x01);
1228 write_mos_reg(serial, port_number, MOS7720_DLM, 0x00);
1229 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1230 write_mos_reg(serial, port_number, MOS7720_LCR,
1231 mos7720_port->shadowLCR);
1232
1233 return 0;
1234}
1235
1236/* baud rate information */
1237struct divisor_table_entry {
1238 __u32 baudrate;
1239 __u16 divisor;
1240};
1241
1242/* Define table of divisors for moschip 7720 hardware *
1243 * These assume a 3.6864MHz crystal, the standard /16, and *
1244 * MCR.7 = 0. */
1245static const struct divisor_table_entry divisor_table[] = {
1246 { 50, 2304},
1247 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */
1248 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */
1249 { 150, 768},
1250 { 300, 384},
1251 { 600, 192},
1252 { 1200, 96},
1253 { 1800, 64},
1254 { 2400, 48},
1255 { 4800, 24},
1256 { 7200, 16},
1257 { 9600, 12},
1258 { 19200, 6},
1259 { 38400, 3},
1260 { 57600, 2},
1261 { 115200, 1},
1262};
1263
1264/*****************************************************************************
1265 * calc_baud_rate_divisor
1266 * this function calculates the proper baud rate divisor for the specified
1267 * baud rate.
1268 *****************************************************************************/
1269static int calc_baud_rate_divisor(struct usb_serial_port *port, int baudrate, int *divisor)
1270{
1271 int i;
1272 __u16 custom;
1273 __u16 round1;
1274 __u16 round;
1275
1276
1277 dev_dbg(&port->dev, "%s - %d\n", __func__, baudrate);
1278
1279 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) {
1280 if (divisor_table[i].baudrate == baudrate) {
1281 *divisor = divisor_table[i].divisor;
1282 return 0;
1283 }
1284 }
1285
1286 /* After trying for all the standard baud rates *
1287 * Try calculating the divisor for this baud rate */
1288 if (baudrate > 75 && baudrate < 230400) {
1289 /* get the divisor */
1290 custom = (__u16)(230400L / baudrate);
1291
1292 /* Check for round off */
1293 round1 = (__u16)(2304000L / baudrate);
1294 round = (__u16)(round1 - (custom * 10));
1295 if (round > 4)
1296 custom++;
1297 *divisor = custom;
1298
1299 dev_dbg(&port->dev, "Baud %d = %d\n", baudrate, custom);
1300 return 0;
1301 }
1302
1303 dev_dbg(&port->dev, "Baud calculation Failed...\n");
1304 return -EINVAL;
1305}
1306
1307/*
1308 * send_cmd_write_baud_rate
1309 * this function sends the proper command to change the baud rate of the
1310 * specified port.
1311 */
1312static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port,
1313 int baudrate)
1314{
1315 struct usb_serial_port *port;
1316 struct usb_serial *serial;
1317 int divisor;
1318 int status;
1319 unsigned char number;
1320
1321 if (mos7720_port == NULL)
1322 return -1;
1323
1324 port = mos7720_port->port;
1325 serial = port->serial;
1326
1327 number = port->port_number;
1328 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudrate);
1329
1330 /* Calculate the Divisor */
1331 status = calc_baud_rate_divisor(port, baudrate, &divisor);
1332 if (status) {
1333 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1334 return status;
1335 }
1336
1337 /* Enable access to divisor latch */
1338 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1339 write_mos_reg(serial, number, MOS7720_LCR, mos7720_port->shadowLCR);
1340
1341 /* Write the divisor */
1342 write_mos_reg(serial, number, MOS7720_DLL, (__u8)(divisor & 0xff));
1343 write_mos_reg(serial, number, MOS7720_DLM,
1344 (__u8)((divisor & 0xff00) >> 8));
1345
1346 /* Disable access to divisor latch */
1347 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1348 write_mos_reg(serial, number, MOS7720_LCR, mos7720_port->shadowLCR);
1349
1350 return status;
1351}
1352
1353/*
1354 * change_port_settings
1355 * This routine is called to set the UART on the device to match
1356 * the specified new settings.
1357 */
1358static void change_port_settings(struct tty_struct *tty,
1359 struct moschip_port *mos7720_port,
1360 const struct ktermios *old_termios)
1361{
1362 struct usb_serial_port *port;
1363 struct usb_serial *serial;
1364 int baud;
1365 unsigned cflag;
1366 __u8 lData;
1367 __u8 lParity;
1368 __u8 lStop;
1369 int status;
1370 int port_number;
1371
1372 if (mos7720_port == NULL)
1373 return ;
1374
1375 port = mos7720_port->port;
1376 serial = port->serial;
1377 port_number = port->port_number;
1378
1379 if (!mos7720_port->open) {
1380 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1381 return;
1382 }
1383
1384 lStop = 0x00; /* 1 stop bit */
1385 lParity = 0x00; /* No parity */
1386
1387 cflag = tty->termios.c_cflag;
1388
1389 lData = UART_LCR_WLEN(tty_get_char_size(cflag));
1390
1391 /* Change the Parity bit */
1392 if (cflag & PARENB) {
1393 if (cflag & PARODD) {
1394 lParity = UART_LCR_PARITY;
1395 dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1396 } else {
1397 lParity = (UART_LCR_EPAR | UART_LCR_PARITY);
1398 dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1399 }
1400
1401 } else {
1402 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1403 }
1404
1405 if (cflag & CMSPAR)
1406 lParity = lParity | 0x20;
1407
1408 /* Change the Stop bit */
1409 if (cflag & CSTOPB) {
1410 lStop = UART_LCR_STOP;
1411 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1412 } else {
1413 lStop = 0x00;
1414 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1415 }
1416
1417#define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
1418#define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
1419#define LCR_PAR_MASK 0x38 /* Mask for parity field */
1420
1421 /* Update the LCR with the correct value */
1422 mos7720_port->shadowLCR &=
1423 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1424 mos7720_port->shadowLCR |= (lData | lParity | lStop);
1425
1426
1427 /* Disable Interrupts */
1428 write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
1429 write_mos_reg(serial, port_number, MOS7720_FCR, 0x00);
1430 write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf);
1431
1432 /* Send the updated LCR value to the mos7720 */
1433 write_mos_reg(serial, port_number, MOS7720_LCR,
1434 mos7720_port->shadowLCR);
1435 mos7720_port->shadowMCR = 0x0b;
1436 write_mos_reg(serial, port_number, MOS7720_MCR,
1437 mos7720_port->shadowMCR);
1438
1439 /* set up the MCR register and send it to the mos7720 */
1440 mos7720_port->shadowMCR = UART_MCR_OUT2;
1441 if (cflag & CBAUD)
1442 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS);
1443
1444 if (cflag & CRTSCTS) {
1445 mos7720_port->shadowMCR |= (UART_MCR_XONANY);
1446 /* To set hardware flow control to the specified *
1447 * serial port, in SP1/2_CONTROL_REG */
1448 if (port_number)
1449 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG,
1450 0x01);
1451 else
1452 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG,
1453 0x02);
1454
1455 } else
1456 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY);
1457
1458 write_mos_reg(serial, port_number, MOS7720_MCR,
1459 mos7720_port->shadowMCR);
1460
1461 /* Determine divisor based on baud rate */
1462 baud = tty_get_baud_rate(tty);
1463 if (!baud) {
1464 /* pick a default, any default... */
1465 dev_dbg(&port->dev, "Picked default baud...\n");
1466 baud = 9600;
1467 }
1468
1469 if (baud >= 230400) {
1470 set_higher_rates(mos7720_port, baud);
1471 /* Enable Interrupts */
1472 write_mos_reg(serial, port_number, MOS7720_IER, 0x0c);
1473 return;
1474 }
1475
1476 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1477 status = send_cmd_write_baud_rate(mos7720_port, baud);
1478 /* FIXME: needs to write actual resulting baud back not just
1479 blindly do so */
1480 if (cflag & CBAUD)
1481 tty_encode_baud_rate(tty, baud, baud);
1482 /* Enable Interrupts */
1483 write_mos_reg(serial, port_number, MOS7720_IER, 0x0c);
1484
1485 if (port->read_urb->status != -EINPROGRESS) {
1486 status = usb_submit_urb(port->read_urb, GFP_KERNEL);
1487 if (status)
1488 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status);
1489 }
1490}
1491
1492/*
1493 * mos7720_set_termios
1494 * this function is called by the tty driver when it wants to change the
1495 * termios structure.
1496 */
1497static void mos7720_set_termios(struct tty_struct *tty,
1498 struct usb_serial_port *port,
1499 const struct ktermios *old_termios)
1500{
1501 int status;
1502 struct moschip_port *mos7720_port;
1503
1504 mos7720_port = usb_get_serial_port_data(port);
1505
1506 if (mos7720_port == NULL)
1507 return;
1508
1509 if (!mos7720_port->open) {
1510 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1511 return;
1512 }
1513
1514 /* change the port settings to the new ones specified */
1515 change_port_settings(tty, mos7720_port, old_termios);
1516
1517 if (port->read_urb->status != -EINPROGRESS) {
1518 status = usb_submit_urb(port->read_urb, GFP_KERNEL);
1519 if (status)
1520 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status);
1521 }
1522}
1523
1524/*
1525 * get_lsr_info - get line status register info
1526 *
1527 * Purpose: Let user call ioctl() to get info when the UART physically
1528 * is emptied. On bus types like RS485, the transmitter must
1529 * release the bus after transmitting. This must be done when
1530 * the transmit shift register is empty, not be done when the
1531 * transmit holding register is empty. This functionality
1532 * allows an RS485 driver to be written in user space.
1533 */
1534static int get_lsr_info(struct tty_struct *tty,
1535 struct moschip_port *mos7720_port, unsigned int __user *value)
1536{
1537 struct usb_serial_port *port = tty->driver_data;
1538 unsigned int result = 0;
1539 unsigned char data = 0;
1540 int port_number = port->port_number;
1541 int count;
1542
1543 count = mos7720_chars_in_buffer(tty);
1544 if (count == 0) {
1545 read_mos_reg(port->serial, port_number, MOS7720_LSR, &data);
1546 if ((data & (UART_LSR_TEMT | UART_LSR_THRE))
1547 == (UART_LSR_TEMT | UART_LSR_THRE)) {
1548 dev_dbg(&port->dev, "%s -- Empty\n", __func__);
1549 result = TIOCSER_TEMT;
1550 }
1551 }
1552 if (copy_to_user(value, &result, sizeof(int)))
1553 return -EFAULT;
1554 return 0;
1555}
1556
1557static int mos7720_tiocmget(struct tty_struct *tty)
1558{
1559 struct usb_serial_port *port = tty->driver_data;
1560 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1561 unsigned int result = 0;
1562 unsigned int mcr ;
1563 unsigned int msr ;
1564
1565 mcr = mos7720_port->shadowMCR;
1566 msr = mos7720_port->shadowMSR;
1567
1568 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */
1569 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */
1570 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */
1571 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */
1572 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */
1573 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
1574
1575 return result;
1576}
1577
1578static int mos7720_tiocmset(struct tty_struct *tty,
1579 unsigned int set, unsigned int clear)
1580{
1581 struct usb_serial_port *port = tty->driver_data;
1582 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1583 unsigned int mcr ;
1584
1585 mcr = mos7720_port->shadowMCR;
1586
1587 if (set & TIOCM_RTS)
1588 mcr |= UART_MCR_RTS;
1589 if (set & TIOCM_DTR)
1590 mcr |= UART_MCR_DTR;
1591 if (set & TIOCM_LOOP)
1592 mcr |= UART_MCR_LOOP;
1593
1594 if (clear & TIOCM_RTS)
1595 mcr &= ~UART_MCR_RTS;
1596 if (clear & TIOCM_DTR)
1597 mcr &= ~UART_MCR_DTR;
1598 if (clear & TIOCM_LOOP)
1599 mcr &= ~UART_MCR_LOOP;
1600
1601 mos7720_port->shadowMCR = mcr;
1602 write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
1603 mos7720_port->shadowMCR);
1604
1605 return 0;
1606}
1607
1608static int mos7720_ioctl(struct tty_struct *tty,
1609 unsigned int cmd, unsigned long arg)
1610{
1611 struct usb_serial_port *port = tty->driver_data;
1612 struct moschip_port *mos7720_port;
1613
1614 mos7720_port = usb_get_serial_port_data(port);
1615 if (mos7720_port == NULL)
1616 return -ENODEV;
1617
1618 switch (cmd) {
1619 case TIOCSERGETLSR:
1620 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
1621 return get_lsr_info(tty, mos7720_port,
1622 (unsigned int __user *)arg);
1623 }
1624
1625 return -ENOIOCTLCMD;
1626}
1627
1628static int mos7720_startup(struct usb_serial *serial)
1629{
1630 struct usb_device *dev;
1631 char data;
1632 u16 product;
1633 int ret_val;
1634
1635 product = le16_to_cpu(serial->dev->descriptor.idProduct);
1636 dev = serial->dev;
1637
1638 if (product == MOSCHIP_DEVICE_ID_7715) {
1639 struct urb *urb = serial->port[0]->interrupt_in_urb;
1640
1641 urb->complete = mos7715_interrupt_callback;
1642
1643#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
1644 ret_val = mos7715_parport_init(serial);
1645 if (ret_val < 0)
1646 return ret_val;
1647#endif
1648 }
1649 /* start the interrupt urb */
1650 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL);
1651 if (ret_val) {
1652 dev_err(&dev->dev, "failed to submit interrupt urb: %d\n",
1653 ret_val);
1654 }
1655
1656 /* LSR For Port 1 */
1657 read_mos_reg(serial, 0, MOS7720_LSR, &data);
1658 dev_dbg(&dev->dev, "LSR:%x\n", data);
1659
1660 return 0;
1661}
1662
1663static void mos7720_release(struct usb_serial *serial)
1664{
1665 usb_kill_urb(serial->port[0]->interrupt_in_urb);
1666
1667#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
1668 /* close the parallel port */
1669
1670 if (le16_to_cpu(serial->dev->descriptor.idProduct)
1671 == MOSCHIP_DEVICE_ID_7715) {
1672 struct mos7715_parport *mos_parport =
1673 usb_get_serial_data(serial);
1674
1675 /* prevent NULL ptr dereference in port callbacks */
1676 spin_lock(&release_lock);
1677 mos_parport->pp->private_data = NULL;
1678 spin_unlock(&release_lock);
1679
1680 /* wait for synchronous usb calls to return */
1681 if (mos_parport->msg_pending)
1682 wait_for_completion_timeout(&mos_parport->syncmsg_compl,
1683 msecs_to_jiffies(MOS_WDR_TIMEOUT));
1684 /*
1685 * If delayed work is currently scheduled, wait for it to
1686 * complete. This also implies barriers that ensure the
1687 * below serial clearing is not hoisted above the ->work.
1688 */
1689 cancel_work_sync(&mos_parport->work);
1690
1691 parport_remove_port(mos_parport->pp);
1692 usb_set_serial_data(serial, NULL);
1693 mos_parport->serial = NULL;
1694
1695 parport_del_port(mos_parport->pp);
1696
1697 kref_put(&mos_parport->ref_count, destroy_mos_parport);
1698 }
1699#endif
1700}
1701
1702static int mos7720_port_probe(struct usb_serial_port *port)
1703{
1704 struct moschip_port *mos7720_port;
1705
1706 mos7720_port = kzalloc(sizeof(*mos7720_port), GFP_KERNEL);
1707 if (!mos7720_port)
1708 return -ENOMEM;
1709
1710 mos7720_port->port = port;
1711
1712 usb_set_serial_port_data(port, mos7720_port);
1713
1714 return 0;
1715}
1716
1717static void mos7720_port_remove(struct usb_serial_port *port)
1718{
1719 struct moschip_port *mos7720_port;
1720
1721 mos7720_port = usb_get_serial_port_data(port);
1722 kfree(mos7720_port);
1723}
1724
1725static struct usb_serial_driver moschip7720_2port_driver = {
1726 .driver = {
1727 .owner = THIS_MODULE,
1728 .name = "moschip7720",
1729 },
1730 .description = "Moschip 2 port adapter",
1731 .id_table = id_table,
1732 .num_bulk_in = 2,
1733 .num_bulk_out = 2,
1734 .num_interrupt_in = 1,
1735 .calc_num_ports = mos77xx_calc_num_ports,
1736 .open = mos7720_open,
1737 .close = mos7720_close,
1738 .throttle = mos7720_throttle,
1739 .unthrottle = mos7720_unthrottle,
1740 .attach = mos7720_startup,
1741 .release = mos7720_release,
1742 .port_probe = mos7720_port_probe,
1743 .port_remove = mos7720_port_remove,
1744 .ioctl = mos7720_ioctl,
1745 .tiocmget = mos7720_tiocmget,
1746 .tiocmset = mos7720_tiocmset,
1747 .set_termios = mos7720_set_termios,
1748 .write = mos7720_write,
1749 .write_room = mos7720_write_room,
1750 .chars_in_buffer = mos7720_chars_in_buffer,
1751 .break_ctl = mos7720_break,
1752 .read_bulk_callback = mos7720_bulk_in_callback,
1753 .read_int_callback = mos7720_interrupt_callback,
1754};
1755
1756static struct usb_serial_driver * const serial_drivers[] = {
1757 &moschip7720_2port_driver, NULL
1758};
1759
1760module_usb_serial_driver(serial_drivers, id_table);
1761
1762MODULE_AUTHOR(DRIVER_AUTHOR);
1763MODULE_DESCRIPTION(DRIVER_DESC);
1764MODULE_LICENSE("GPL v2");
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 */
59struct 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
72static 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};
77MODULE_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
85struct 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
93enum 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
99struct 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 */
115static DEFINE_SPINLOCK(release_lock);
116
117#endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
118
119static const unsigned int dummy; /* for clarity in register access fns */
120
121enum 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 */
148static 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 */
179static 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 */
197static 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 */
219static 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 return -ENOMEM;
234
235 status = usb_control_msg(usbdev, pipe, request, requesttype, value,
236 index, buf, 1, MOS_WDR_TIMEOUT);
237 if (status == 1)
238 *data = *buf;
239 else if (status < 0)
240 dev_err(&usbdev->dev,
241 "mos7720: usb_control_msg() failed: %d\n", status);
242 kfree(buf);
243
244 return status;
245}
246
247#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
248
249static inline int mos7715_change_mode(struct mos7715_parport *mos_parport,
250 enum mos7715_pp_modes mode)
251{
252 mos_parport->shadowECR = mode;
253 write_mos_reg(mos_parport->serial, dummy, MOS7720_ECR,
254 mos_parport->shadowECR);
255 return 0;
256}
257
258static void destroy_mos_parport(struct kref *kref)
259{
260 struct mos7715_parport *mos_parport =
261 container_of(kref, struct mos7715_parport, ref_count);
262
263 kfree(mos_parport);
264}
265
266static void destroy_urbtracker(struct kref *kref)
267{
268 struct urbtracker *urbtrack =
269 container_of(kref, struct urbtracker, ref_count);
270 struct mos7715_parport *mos_parport = urbtrack->mos_parport;
271
272 usb_free_urb(urbtrack->urb);
273 kfree(urbtrack->setup);
274 kfree(urbtrack);
275 kref_put(&mos_parport->ref_count, destroy_mos_parport);
276}
277
278/*
279 * This runs as a tasklet when sending an urb in a non-blocking parallel
280 * port callback had to be deferred because the disconnect mutex could not be
281 * obtained at the time.
282 */
283static void send_deferred_urbs(unsigned long _mos_parport)
284{
285 int ret_val;
286 unsigned long flags;
287 struct mos7715_parport *mos_parport = (void *)_mos_parport;
288 struct urbtracker *urbtrack, *tmp;
289 struct list_head *cursor, *next;
290 struct device *dev;
291
292 /* if release function ran, game over */
293 if (unlikely(mos_parport->serial == NULL))
294 return;
295
296 dev = &mos_parport->serial->dev->dev;
297
298 /* try again to get the mutex */
299 if (!mutex_trylock(&mos_parport->serial->disc_mutex)) {
300 dev_dbg(dev, "%s: rescheduling tasklet\n", __func__);
301 tasklet_schedule(&mos_parport->urb_tasklet);
302 return;
303 }
304
305 /* if device disconnected, game over */
306 if (unlikely(mos_parport->serial->disconnected)) {
307 mutex_unlock(&mos_parport->serial->disc_mutex);
308 return;
309 }
310
311 spin_lock_irqsave(&mos_parport->listlock, flags);
312 if (list_empty(&mos_parport->deferred_urbs)) {
313 spin_unlock_irqrestore(&mos_parport->listlock, flags);
314 mutex_unlock(&mos_parport->serial->disc_mutex);
315 dev_dbg(dev, "%s: deferred_urbs list empty\n", __func__);
316 return;
317 }
318
319 /* move contents of deferred_urbs list to active_urbs list and submit */
320 list_for_each_safe(cursor, next, &mos_parport->deferred_urbs)
321 list_move_tail(cursor, &mos_parport->active_urbs);
322 list_for_each_entry_safe(urbtrack, tmp, &mos_parport->active_urbs,
323 urblist_entry) {
324 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
325 dev_dbg(dev, "%s: urb submitted\n", __func__);
326 if (ret_val) {
327 dev_err(dev, "usb_submit_urb() failed: %d\n", ret_val);
328 list_del(&urbtrack->urblist_entry);
329 kref_put(&urbtrack->ref_count, destroy_urbtracker);
330 }
331 }
332 spin_unlock_irqrestore(&mos_parport->listlock, flags);
333 mutex_unlock(&mos_parport->serial->disc_mutex);
334}
335
336/* callback for parallel port control urbs submitted asynchronously */
337static void async_complete(struct urb *urb)
338{
339 struct urbtracker *urbtrack = urb->context;
340 int status = urb->status;
341
342 if (unlikely(status))
343 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n", __func__, status);
344
345 /* remove the urbtracker from the active_urbs list */
346 spin_lock(&urbtrack->mos_parport->listlock);
347 list_del(&urbtrack->urblist_entry);
348 spin_unlock(&urbtrack->mos_parport->listlock);
349 kref_put(&urbtrack->ref_count, destroy_urbtracker);
350}
351
352static int write_parport_reg_nonblock(struct mos7715_parport *mos_parport,
353 enum mos_regs reg, __u8 data)
354{
355 struct urbtracker *urbtrack;
356 int ret_val;
357 unsigned long flags;
358 struct usb_serial *serial = mos_parport->serial;
359 struct usb_device *usbdev = serial->dev;
360
361 /* create and initialize the control urb and containing urbtracker */
362 urbtrack = kmalloc(sizeof(struct urbtracker), GFP_ATOMIC);
363 if (!urbtrack)
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) {
370 kfree(urbtrack);
371 return -ENOMEM;
372 }
373 urbtrack->setup = kmalloc(sizeof(*urbtrack->setup), GFP_ATOMIC);
374 if (!urbtrack->setup) {
375 usb_free_urb(urbtrack->urb);
376 kfree(urbtrack);
377 return -ENOMEM;
378 }
379 urbtrack->setup->bRequestType = (__u8)0x40;
380 urbtrack->setup->bRequest = (__u8)0x0e;
381 urbtrack->setup->wValue = cpu_to_le16(get_reg_value(reg, dummy));
382 urbtrack->setup->wIndex = cpu_to_le16(get_reg_index(reg));
383 urbtrack->setup->wLength = 0;
384 usb_fill_control_urb(urbtrack->urb, usbdev,
385 usb_sndctrlpipe(usbdev, 0),
386 (unsigned char *)urbtrack->setup,
387 NULL, 0, async_complete, urbtrack);
388 kref_init(&urbtrack->ref_count);
389 INIT_LIST_HEAD(&urbtrack->urblist_entry);
390
391 /*
392 * get the disconnect mutex, or add tracker to the deferred_urbs list
393 * and schedule a tasklet to try again later
394 */
395 if (!mutex_trylock(&serial->disc_mutex)) {
396 spin_lock_irqsave(&mos_parport->listlock, flags);
397 list_add_tail(&urbtrack->urblist_entry,
398 &mos_parport->deferred_urbs);
399 spin_unlock_irqrestore(&mos_parport->listlock, flags);
400 tasklet_schedule(&mos_parport->urb_tasklet);
401 dev_dbg(&usbdev->dev, "tasklet scheduled\n");
402 return 0;
403 }
404
405 /* bail if device disconnected */
406 if (serial->disconnected) {
407 kref_put(&urbtrack->ref_count, destroy_urbtracker);
408 mutex_unlock(&serial->disc_mutex);
409 return -ENODEV;
410 }
411
412 /* add the tracker to the active_urbs list and submit */
413 spin_lock_irqsave(&mos_parport->listlock, flags);
414 list_add_tail(&urbtrack->urblist_entry, &mos_parport->active_urbs);
415 spin_unlock_irqrestore(&mos_parport->listlock, flags);
416 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
417 mutex_unlock(&serial->disc_mutex);
418 if (ret_val) {
419 dev_err(&usbdev->dev,
420 "%s: submit_urb() failed: %d\n", __func__, ret_val);
421 spin_lock_irqsave(&mos_parport->listlock, flags);
422 list_del(&urbtrack->urblist_entry);
423 spin_unlock_irqrestore(&mos_parport->listlock, flags);
424 kref_put(&urbtrack->ref_count, destroy_urbtracker);
425 return ret_val;
426 }
427 return 0;
428}
429
430/*
431 * This is the the common top part of all parallel port callback operations that
432 * send synchronous messages to the device. This implements convoluted locking
433 * that avoids two scenarios: (1) a port operation is called after usbserial
434 * has called our release function, at which point struct mos7715_parport has
435 * been destroyed, and (2) the device has been disconnected, but usbserial has
436 * not called the release function yet because someone has a serial port open.
437 * The shared release_lock prevents the first, and the mutex and disconnected
438 * flag maintained by usbserial covers the second. We also use the msg_pending
439 * flag to ensure that all synchronous usb message calls have completed before
440 * our release function can return.
441 */
442static int parport_prologue(struct parport *pp)
443{
444 struct mos7715_parport *mos_parport;
445
446 spin_lock(&release_lock);
447 mos_parport = pp->private_data;
448 if (unlikely(mos_parport == NULL)) {
449 /* release fn called, port struct destroyed */
450 spin_unlock(&release_lock);
451 return -1;
452 }
453 mos_parport->msg_pending = true; /* synch usb call pending */
454 reinit_completion(&mos_parport->syncmsg_compl);
455 spin_unlock(&release_lock);
456
457 mutex_lock(&mos_parport->serial->disc_mutex);
458 if (mos_parport->serial->disconnected) {
459 /* device disconnected */
460 mutex_unlock(&mos_parport->serial->disc_mutex);
461 mos_parport->msg_pending = false;
462 complete(&mos_parport->syncmsg_compl);
463 return -1;
464 }
465
466 return 0;
467}
468
469/*
470 * This is the common bottom part of all parallel port functions that send
471 * synchronous messages to the device.
472 */
473static inline void parport_epilogue(struct parport *pp)
474{
475 struct mos7715_parport *mos_parport = pp->private_data;
476 mutex_unlock(&mos_parport->serial->disc_mutex);
477 mos_parport->msg_pending = false;
478 complete(&mos_parport->syncmsg_compl);
479}
480
481static void parport_mos7715_write_data(struct parport *pp, unsigned char d)
482{
483 struct mos7715_parport *mos_parport = pp->private_data;
484
485 if (parport_prologue(pp) < 0)
486 return;
487 mos7715_change_mode(mos_parport, SPP);
488 write_mos_reg(mos_parport->serial, dummy, MOS7720_DPR, (__u8)d);
489 parport_epilogue(pp);
490}
491
492static unsigned char parport_mos7715_read_data(struct parport *pp)
493{
494 struct mos7715_parport *mos_parport = pp->private_data;
495 unsigned char d;
496
497 if (parport_prologue(pp) < 0)
498 return 0;
499 read_mos_reg(mos_parport->serial, dummy, MOS7720_DPR, &d);
500 parport_epilogue(pp);
501 return d;
502}
503
504static void parport_mos7715_write_control(struct parport *pp, unsigned char d)
505{
506 struct mos7715_parport *mos_parport = pp->private_data;
507 __u8 data;
508
509 if (parport_prologue(pp) < 0)
510 return;
511 data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0);
512 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, data);
513 mos_parport->shadowDCR = data;
514 parport_epilogue(pp);
515}
516
517static unsigned char parport_mos7715_read_control(struct parport *pp)
518{
519 struct mos7715_parport *mos_parport = pp->private_data;
520 __u8 dcr;
521
522 spin_lock(&release_lock);
523 mos_parport = pp->private_data;
524 if (unlikely(mos_parport == NULL)) {
525 spin_unlock(&release_lock);
526 return 0;
527 }
528 dcr = mos_parport->shadowDCR & 0x0f;
529 spin_unlock(&release_lock);
530 return dcr;
531}
532
533static unsigned char parport_mos7715_frob_control(struct parport *pp,
534 unsigned char mask,
535 unsigned char val)
536{
537 struct mos7715_parport *mos_parport = pp->private_data;
538 __u8 dcr;
539
540 mask &= 0x0f;
541 val &= 0x0f;
542 if (parport_prologue(pp) < 0)
543 return 0;
544 mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val;
545 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
546 mos_parport->shadowDCR);
547 dcr = mos_parport->shadowDCR & 0x0f;
548 parport_epilogue(pp);
549 return dcr;
550}
551
552static unsigned char parport_mos7715_read_status(struct parport *pp)
553{
554 unsigned char status;
555 struct mos7715_parport *mos_parport = pp->private_data;
556
557 spin_lock(&release_lock);
558 mos_parport = pp->private_data;
559 if (unlikely(mos_parport == NULL)) { /* release called */
560 spin_unlock(&release_lock);
561 return 0;
562 }
563 status = atomic_read(&mos_parport->shadowDSR) & 0xf8;
564 spin_unlock(&release_lock);
565 return status;
566}
567
568static void parport_mos7715_enable_irq(struct parport *pp)
569{
570}
571
572static void parport_mos7715_disable_irq(struct parport *pp)
573{
574}
575
576static void parport_mos7715_data_forward(struct parport *pp)
577{
578 struct mos7715_parport *mos_parport = pp->private_data;
579
580 if (parport_prologue(pp) < 0)
581 return;
582 mos7715_change_mode(mos_parport, PS2);
583 mos_parport->shadowDCR &= ~0x20;
584 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
585 mos_parport->shadowDCR);
586 parport_epilogue(pp);
587}
588
589static void parport_mos7715_data_reverse(struct parport *pp)
590{
591 struct mos7715_parport *mos_parport = pp->private_data;
592
593 if (parport_prologue(pp) < 0)
594 return;
595 mos7715_change_mode(mos_parport, PS2);
596 mos_parport->shadowDCR |= 0x20;
597 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
598 mos_parport->shadowDCR);
599 parport_epilogue(pp);
600}
601
602static void parport_mos7715_init_state(struct pardevice *dev,
603 struct parport_state *s)
604{
605 s->u.pc.ctr = DCR_INIT_VAL;
606 s->u.pc.ecr = ECR_INIT_VAL;
607}
608
609/* N.B. Parport core code requires that this function not block */
610static void parport_mos7715_save_state(struct parport *pp,
611 struct parport_state *s)
612{
613 struct mos7715_parport *mos_parport;
614
615 spin_lock(&release_lock);
616 mos_parport = pp->private_data;
617 if (unlikely(mos_parport == NULL)) { /* release called */
618 spin_unlock(&release_lock);
619 return;
620 }
621 s->u.pc.ctr = mos_parport->shadowDCR;
622 s->u.pc.ecr = mos_parport->shadowECR;
623 spin_unlock(&release_lock);
624}
625
626/* N.B. Parport core code requires that this function not block */
627static void parport_mos7715_restore_state(struct parport *pp,
628 struct parport_state *s)
629{
630 struct mos7715_parport *mos_parport;
631
632 spin_lock(&release_lock);
633 mos_parport = pp->private_data;
634 if (unlikely(mos_parport == NULL)) { /* release called */
635 spin_unlock(&release_lock);
636 return;
637 }
638 write_parport_reg_nonblock(mos_parport, MOS7720_DCR,
639 mos_parport->shadowDCR);
640 write_parport_reg_nonblock(mos_parport, MOS7720_ECR,
641 mos_parport->shadowECR);
642 spin_unlock(&release_lock);
643}
644
645static size_t parport_mos7715_write_compat(struct parport *pp,
646 const void *buffer,
647 size_t len, int flags)
648{
649 int retval;
650 struct mos7715_parport *mos_parport = pp->private_data;
651 int actual_len;
652
653 if (parport_prologue(pp) < 0)
654 return 0;
655 mos7715_change_mode(mos_parport, PPF);
656 retval = usb_bulk_msg(mos_parport->serial->dev,
657 usb_sndbulkpipe(mos_parport->serial->dev, 2),
658 (void *)buffer, len, &actual_len,
659 MOS_WDR_TIMEOUT);
660 parport_epilogue(pp);
661 if (retval) {
662 dev_err(&mos_parport->serial->dev->dev,
663 "mos7720: usb_bulk_msg() failed: %d\n", retval);
664 return 0;
665 }
666 return actual_len;
667}
668
669static struct parport_operations parport_mos7715_ops = {
670 .owner = THIS_MODULE,
671 .write_data = parport_mos7715_write_data,
672 .read_data = parport_mos7715_read_data,
673
674 .write_control = parport_mos7715_write_control,
675 .read_control = parport_mos7715_read_control,
676 .frob_control = parport_mos7715_frob_control,
677
678 .read_status = parport_mos7715_read_status,
679
680 .enable_irq = parport_mos7715_enable_irq,
681 .disable_irq = parport_mos7715_disable_irq,
682
683 .data_forward = parport_mos7715_data_forward,
684 .data_reverse = parport_mos7715_data_reverse,
685
686 .init_state = parport_mos7715_init_state,
687 .save_state = parport_mos7715_save_state,
688 .restore_state = parport_mos7715_restore_state,
689
690 .compat_write_data = parport_mos7715_write_compat,
691
692 .nibble_read_data = parport_ieee1284_read_nibble,
693 .byte_read_data = parport_ieee1284_read_byte,
694};
695
696/*
697 * Allocate and initialize parallel port control struct, initialize
698 * the parallel port hardware device, and register with the parport subsystem.
699 */
700static int mos7715_parport_init(struct usb_serial *serial)
701{
702 struct mos7715_parport *mos_parport;
703
704 /* allocate and initialize parallel port control struct */
705 mos_parport = kzalloc(sizeof(struct mos7715_parport), GFP_KERNEL);
706 if (!mos_parport)
707 return -ENOMEM;
708
709 mos_parport->msg_pending = false;
710 kref_init(&mos_parport->ref_count);
711 spin_lock_init(&mos_parport->listlock);
712 INIT_LIST_HEAD(&mos_parport->active_urbs);
713 INIT_LIST_HEAD(&mos_parport->deferred_urbs);
714 usb_set_serial_data(serial, mos_parport); /* hijack private pointer */
715 mos_parport->serial = serial;
716 tasklet_init(&mos_parport->urb_tasklet, send_deferred_urbs,
717 (unsigned long) mos_parport);
718 init_completion(&mos_parport->syncmsg_compl);
719
720 /* cycle parallel port reset bit */
721 write_mos_reg(mos_parport->serial, dummy, MOS7720_PP_REG, (__u8)0x80);
722 write_mos_reg(mos_parport->serial, dummy, MOS7720_PP_REG, (__u8)0x00);
723
724 /* initialize device registers */
725 mos_parport->shadowDCR = DCR_INIT_VAL;
726 write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
727 mos_parport->shadowDCR);
728 mos_parport->shadowECR = ECR_INIT_VAL;
729 write_mos_reg(mos_parport->serial, dummy, MOS7720_ECR,
730 mos_parport->shadowECR);
731
732 /* register with parport core */
733 mos_parport->pp = parport_register_port(0, PARPORT_IRQ_NONE,
734 PARPORT_DMA_NONE,
735 &parport_mos7715_ops);
736 if (mos_parport->pp == NULL) {
737 dev_err(&serial->interface->dev,
738 "Could not register parport\n");
739 kref_put(&mos_parport->ref_count, destroy_mos_parport);
740 return -EIO;
741 }
742 mos_parport->pp->private_data = mos_parport;
743 mos_parport->pp->modes = PARPORT_MODE_COMPAT | PARPORT_MODE_PCSPP;
744 mos_parport->pp->dev = &serial->interface->dev;
745 parport_announce_port(mos_parport->pp);
746
747 return 0;
748}
749#endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
750
751/*
752 * mos7720_interrupt_callback
753 * this is the callback function for when we have received data on the
754 * interrupt endpoint.
755 */
756static void mos7720_interrupt_callback(struct urb *urb)
757{
758 int result;
759 int length;
760 int status = urb->status;
761 struct device *dev = &urb->dev->dev;
762 __u8 *data;
763 __u8 sp1;
764 __u8 sp2;
765
766 switch (status) {
767 case 0:
768 /* success */
769 break;
770 case -ECONNRESET:
771 case -ENOENT:
772 case -ESHUTDOWN:
773 /* this urb is terminated, clean up */
774 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
775 return;
776 default:
777 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
778 goto exit;
779 }
780
781 length = urb->actual_length;
782 data = urb->transfer_buffer;
783
784 /* Moschip get 4 bytes
785 * Byte 1 IIR Port 1 (port.number is 0)
786 * Byte 2 IIR Port 2 (port.number is 1)
787 * Byte 3 --------------
788 * Byte 4 FIFO status for both */
789
790 /* the above description is inverted
791 * oneukum 2007-03-14 */
792
793 if (unlikely(length != 4)) {
794 dev_dbg(dev, "Wrong data !!!\n");
795 return;
796 }
797
798 sp1 = data[3];
799 sp2 = data[2];
800
801 if ((sp1 | sp2) & 0x01) {
802 /* No Interrupt Pending in both the ports */
803 dev_dbg(dev, "No Interrupt !!!\n");
804 } else {
805 switch (sp1 & 0x0f) {
806 case SERIAL_IIR_RLS:
807 dev_dbg(dev, "Serial Port 1: Receiver status error or address bit detected in 9-bit mode\n");
808 break;
809 case SERIAL_IIR_CTI:
810 dev_dbg(dev, "Serial Port 1: Receiver time out\n");
811 break;
812 case SERIAL_IIR_MS:
813 /* dev_dbg(dev, "Serial Port 1: Modem status change\n"); */
814 break;
815 }
816
817 switch (sp2 & 0x0f) {
818 case SERIAL_IIR_RLS:
819 dev_dbg(dev, "Serial Port 2: Receiver status error or address bit detected in 9-bit mode\n");
820 break;
821 case SERIAL_IIR_CTI:
822 dev_dbg(dev, "Serial Port 2: Receiver time out\n");
823 break;
824 case SERIAL_IIR_MS:
825 /* dev_dbg(dev, "Serial Port 2: Modem status change\n"); */
826 break;
827 }
828 }
829
830exit:
831 result = usb_submit_urb(urb, GFP_ATOMIC);
832 if (result)
833 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result);
834}
835
836/*
837 * mos7715_interrupt_callback
838 * this is the 7715's callback function for when we have received data on
839 * the interrupt endpoint.
840 */
841static void mos7715_interrupt_callback(struct urb *urb)
842{
843 int result;
844 int length;
845 int status = urb->status;
846 struct device *dev = &urb->dev->dev;
847 __u8 *data;
848 __u8 iir;
849
850 switch (status) {
851 case 0:
852 /* success */
853 break;
854 case -ECONNRESET:
855 case -ENOENT:
856 case -ESHUTDOWN:
857 case -ENODEV:
858 /* this urb is terminated, clean up */
859 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
860 return;
861 default:
862 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
863 goto exit;
864 }
865
866 length = urb->actual_length;
867 data = urb->transfer_buffer;
868
869 /* Structure of data from 7715 device:
870 * Byte 1: IIR serial Port
871 * Byte 2: unused
872 * Byte 2: DSR parallel port
873 * Byte 4: FIFO status for both */
874
875 if (unlikely(length != 4)) {
876 dev_dbg(dev, "Wrong data !!!\n");
877 return;
878 }
879
880 iir = data[0];
881 if (!(iir & 0x01)) { /* serial port interrupt pending */
882 switch (iir & 0x0f) {
883 case SERIAL_IIR_RLS:
884 dev_dbg(dev, "Serial Port: Receiver status error or address bit detected in 9-bit mode\n");
885 break;
886 case SERIAL_IIR_CTI:
887 dev_dbg(dev, "Serial Port: Receiver time out\n");
888 break;
889 case SERIAL_IIR_MS:
890 /* dev_dbg(dev, "Serial Port: Modem status change\n"); */
891 break;
892 }
893 }
894
895#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
896 { /* update local copy of DSR reg */
897 struct usb_serial_port *port = urb->context;
898 struct mos7715_parport *mos_parport = port->serial->private;
899 if (unlikely(mos_parport == NULL))
900 return;
901 atomic_set(&mos_parport->shadowDSR, data[2]);
902 }
903#endif
904
905exit:
906 result = usb_submit_urb(urb, GFP_ATOMIC);
907 if (result)
908 dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result);
909}
910
911/*
912 * mos7720_bulk_in_callback
913 * this is the callback function for when we have received data on the
914 * bulk in endpoint.
915 */
916static void mos7720_bulk_in_callback(struct urb *urb)
917{
918 int retval;
919 unsigned char *data ;
920 struct usb_serial_port *port;
921 int status = urb->status;
922
923 if (status) {
924 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
925 return;
926 }
927
928 port = urb->context;
929
930 dev_dbg(&port->dev, "Entering...%s\n", __func__);
931
932 data = urb->transfer_buffer;
933
934 if (urb->actual_length) {
935 tty_insert_flip_string(&port->port, data, urb->actual_length);
936 tty_flip_buffer_push(&port->port);
937 }
938
939 if (port->read_urb->status != -EINPROGRESS) {
940 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
941 if (retval)
942 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
943 }
944}
945
946/*
947 * mos7720_bulk_out_data_callback
948 * this is the callback function for when we have finished sending serial
949 * data on the bulk out endpoint.
950 */
951static void mos7720_bulk_out_data_callback(struct urb *urb)
952{
953 struct moschip_port *mos7720_port;
954 int status = urb->status;
955
956 if (status) {
957 dev_dbg(&urb->dev->dev, "nonzero write bulk status received:%d\n", status);
958 return;
959 }
960
961 mos7720_port = urb->context;
962 if (!mos7720_port) {
963 dev_dbg(&urb->dev->dev, "NULL mos7720_port pointer\n");
964 return ;
965 }
966
967 if (mos7720_port->open)
968 tty_port_tty_wakeup(&mos7720_port->port->port);
969}
970
971static int mos77xx_calc_num_ports(struct usb_serial *serial)
972{
973 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
974 if (product == MOSCHIP_DEVICE_ID_7715)
975 return 1;
976
977 return 2;
978}
979
980static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port)
981{
982 struct usb_serial *serial;
983 struct urb *urb;
984 struct moschip_port *mos7720_port;
985 int response;
986 int port_number;
987 __u8 data;
988 int allocated_urbs = 0;
989 int j;
990
991 serial = port->serial;
992
993 mos7720_port = usb_get_serial_port_data(port);
994 if (mos7720_port == NULL)
995 return -ENODEV;
996
997 usb_clear_halt(serial->dev, port->write_urb->pipe);
998 usb_clear_halt(serial->dev, port->read_urb->pipe);
999
1000 /* Initialising the write urb pool */
1001 for (j = 0; j < NUM_URBS; ++j) {
1002 urb = usb_alloc_urb(0, GFP_KERNEL);
1003 mos7720_port->write_urb_pool[j] = urb;
1004 if (!urb)
1005 continue;
1006
1007 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1008 GFP_KERNEL);
1009 if (!urb->transfer_buffer) {
1010 usb_free_urb(mos7720_port->write_urb_pool[j]);
1011 mos7720_port->write_urb_pool[j] = NULL;
1012 continue;
1013 }
1014 allocated_urbs++;
1015 }
1016
1017 if (!allocated_urbs)
1018 return -ENOMEM;
1019
1020 /* Initialize MCS7720 -- Write Init values to corresponding Registers
1021 *
1022 * Register Index
1023 * 0 : MOS7720_THR/MOS7720_RHR
1024 * 1 : MOS7720_IER
1025 * 2 : MOS7720_FCR
1026 * 3 : MOS7720_LCR
1027 * 4 : MOS7720_MCR
1028 * 5 : MOS7720_LSR
1029 * 6 : MOS7720_MSR
1030 * 7 : MOS7720_SPR
1031 *
1032 * 0x08 : SP1/2 Control Reg
1033 */
1034 port_number = port->port_number;
1035 read_mos_reg(serial, port_number, MOS7720_LSR, &data);
1036
1037 dev_dbg(&port->dev, "SS::%p LSR:%x\n", mos7720_port, data);
1038
1039 write_mos_reg(serial, dummy, MOS7720_SP1_REG, 0x02);
1040 write_mos_reg(serial, dummy, MOS7720_SP2_REG, 0x02);
1041
1042 write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
1043 write_mos_reg(serial, port_number, MOS7720_FCR, 0x00);
1044
1045 write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf);
1046 mos7720_port->shadowLCR = 0x03;
1047 write_mos_reg(serial, port_number, MOS7720_LCR,
1048 mos7720_port->shadowLCR);
1049 mos7720_port->shadowMCR = 0x0b;
1050 write_mos_reg(serial, port_number, MOS7720_MCR,
1051 mos7720_port->shadowMCR);
1052
1053 write_mos_reg(serial, port_number, MOS7720_SP_CONTROL_REG, 0x00);
1054 read_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, &data);
1055 data = data | (port->port_number + 1);
1056 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, data);
1057 mos7720_port->shadowLCR = 0x83;
1058 write_mos_reg(serial, port_number, MOS7720_LCR,
1059 mos7720_port->shadowLCR);
1060 write_mos_reg(serial, port_number, MOS7720_THR, 0x0c);
1061 write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
1062 mos7720_port->shadowLCR = 0x03;
1063 write_mos_reg(serial, port_number, MOS7720_LCR,
1064 mos7720_port->shadowLCR);
1065 write_mos_reg(serial, port_number, MOS7720_IER, 0x0c);
1066
1067 response = usb_submit_urb(port->read_urb, GFP_KERNEL);
1068 if (response)
1069 dev_err(&port->dev, "%s - Error %d submitting read urb\n",
1070 __func__, response);
1071
1072 /* initialize our port settings */
1073 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */
1074
1075 /* send a open port command */
1076 mos7720_port->open = 1;
1077
1078 return 0;
1079}
1080
1081/*
1082 * mos7720_chars_in_buffer
1083 * this function is called by the tty driver when it wants to know how many
1084 * bytes of data we currently have outstanding in the port (data that has
1085 * been written, but hasn't made it out the port yet)
1086 * If successful, we return the number of bytes left to be written in the
1087 * system,
1088 * Otherwise we return a negative error number.
1089 */
1090static int mos7720_chars_in_buffer(struct tty_struct *tty)
1091{
1092 struct usb_serial_port *port = tty->driver_data;
1093 int i;
1094 int chars = 0;
1095 struct moschip_port *mos7720_port;
1096
1097 mos7720_port = usb_get_serial_port_data(port);
1098 if (mos7720_port == NULL)
1099 return 0;
1100
1101 for (i = 0; i < NUM_URBS; ++i) {
1102 if (mos7720_port->write_urb_pool[i] &&
1103 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS)
1104 chars += URB_TRANSFER_BUFFER_SIZE;
1105 }
1106 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1107 return chars;
1108}
1109
1110static void mos7720_close(struct usb_serial_port *port)
1111{
1112 struct usb_serial *serial;
1113 struct moschip_port *mos7720_port;
1114 int j;
1115
1116 serial = port->serial;
1117
1118 mos7720_port = usb_get_serial_port_data(port);
1119 if (mos7720_port == NULL)
1120 return;
1121
1122 for (j = 0; j < NUM_URBS; ++j)
1123 usb_kill_urb(mos7720_port->write_urb_pool[j]);
1124
1125 /* Freeing Write URBs */
1126 for (j = 0; j < NUM_URBS; ++j) {
1127 if (mos7720_port->write_urb_pool[j]) {
1128 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer);
1129 usb_free_urb(mos7720_port->write_urb_pool[j]);
1130 }
1131 }
1132
1133 /* While closing port, shutdown all bulk read, write *
1134 * and interrupt read if they exists, otherwise nop */
1135 usb_kill_urb(port->write_urb);
1136 usb_kill_urb(port->read_urb);
1137
1138 write_mos_reg(serial, port->port_number, MOS7720_MCR, 0x00);
1139 write_mos_reg(serial, port->port_number, MOS7720_IER, 0x00);
1140
1141 mos7720_port->open = 0;
1142}
1143
1144static void mos7720_break(struct tty_struct *tty, int break_state)
1145{
1146 struct usb_serial_port *port = tty->driver_data;
1147 unsigned char data;
1148 struct usb_serial *serial;
1149 struct moschip_port *mos7720_port;
1150
1151 serial = port->serial;
1152
1153 mos7720_port = usb_get_serial_port_data(port);
1154 if (mos7720_port == NULL)
1155 return;
1156
1157 if (break_state == -1)
1158 data = mos7720_port->shadowLCR | UART_LCR_SBC;
1159 else
1160 data = mos7720_port->shadowLCR & ~UART_LCR_SBC;
1161
1162 mos7720_port->shadowLCR = data;
1163 write_mos_reg(serial, port->port_number, MOS7720_LCR,
1164 mos7720_port->shadowLCR);
1165}
1166
1167/*
1168 * mos7720_write_room
1169 * this function is called by the tty driver when it wants to know how many
1170 * bytes of data we can accept for a specific port.
1171 * If successful, we return the amount of room that we have for this port
1172 * Otherwise we return a negative error number.
1173 */
1174static int mos7720_write_room(struct tty_struct *tty)
1175{
1176 struct usb_serial_port *port = tty->driver_data;
1177 struct moschip_port *mos7720_port;
1178 int room = 0;
1179 int i;
1180
1181 mos7720_port = usb_get_serial_port_data(port);
1182 if (mos7720_port == NULL)
1183 return -ENODEV;
1184
1185 /* FIXME: Locking */
1186 for (i = 0; i < NUM_URBS; ++i) {
1187 if (mos7720_port->write_urb_pool[i] &&
1188 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS)
1189 room += URB_TRANSFER_BUFFER_SIZE;
1190 }
1191
1192 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
1193 return room;
1194}
1195
1196static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port,
1197 const unsigned char *data, int count)
1198{
1199 int status;
1200 int i;
1201 int bytes_sent = 0;
1202 int transfer_size;
1203
1204 struct moschip_port *mos7720_port;
1205 struct usb_serial *serial;
1206 struct urb *urb;
1207 const unsigned char *current_position = data;
1208
1209 serial = port->serial;
1210
1211 mos7720_port = usb_get_serial_port_data(port);
1212 if (mos7720_port == NULL)
1213 return -ENODEV;
1214
1215 /* try to find a free urb in the list */
1216 urb = NULL;
1217
1218 for (i = 0; i < NUM_URBS; ++i) {
1219 if (mos7720_port->write_urb_pool[i] &&
1220 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) {
1221 urb = mos7720_port->write_urb_pool[i];
1222 dev_dbg(&port->dev, "URB:%d\n", i);
1223 break;
1224 }
1225 }
1226
1227 if (urb == NULL) {
1228 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1229 goto exit;
1230 }
1231
1232 if (urb->transfer_buffer == NULL) {
1233 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1234 GFP_ATOMIC);
1235 if (!urb->transfer_buffer)
1236 goto exit;
1237 }
1238 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1239
1240 memcpy(urb->transfer_buffer, current_position, transfer_size);
1241 usb_serial_debug_data(&port->dev, __func__, transfer_size,
1242 urb->transfer_buffer);
1243
1244 /* fill urb with data and submit */
1245 usb_fill_bulk_urb(urb, serial->dev,
1246 usb_sndbulkpipe(serial->dev,
1247 port->bulk_out_endpointAddress),
1248 urb->transfer_buffer, transfer_size,
1249 mos7720_bulk_out_data_callback, mos7720_port);
1250
1251 /* send it down the pipe */
1252 status = usb_submit_urb(urb, GFP_ATOMIC);
1253 if (status) {
1254 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1255 "with status = %d\n", __func__, status);
1256 bytes_sent = status;
1257 goto exit;
1258 }
1259 bytes_sent = transfer_size;
1260
1261exit:
1262 return bytes_sent;
1263}
1264
1265static void mos7720_throttle(struct tty_struct *tty)
1266{
1267 struct usb_serial_port *port = tty->driver_data;
1268 struct moschip_port *mos7720_port;
1269 int status;
1270
1271 mos7720_port = usb_get_serial_port_data(port);
1272
1273 if (mos7720_port == NULL)
1274 return;
1275
1276 if (!mos7720_port->open) {
1277 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1278 return;
1279 }
1280
1281 /* if we are implementing XON/XOFF, send the stop character */
1282 if (I_IXOFF(tty)) {
1283 unsigned char stop_char = STOP_CHAR(tty);
1284 status = mos7720_write(tty, port, &stop_char, 1);
1285 if (status <= 0)
1286 return;
1287 }
1288
1289 /* if we are implementing RTS/CTS, toggle that line */
1290 if (C_CRTSCTS(tty)) {
1291 mos7720_port->shadowMCR &= ~UART_MCR_RTS;
1292 write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
1293 mos7720_port->shadowMCR);
1294 }
1295}
1296
1297static void mos7720_unthrottle(struct tty_struct *tty)
1298{
1299 struct usb_serial_port *port = tty->driver_data;
1300 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1301 int status;
1302
1303 if (mos7720_port == NULL)
1304 return;
1305
1306 if (!mos7720_port->open) {
1307 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1308 return;
1309 }
1310
1311 /* if we are implementing XON/XOFF, send the start character */
1312 if (I_IXOFF(tty)) {
1313 unsigned char start_char = START_CHAR(tty);
1314 status = mos7720_write(tty, port, &start_char, 1);
1315 if (status <= 0)
1316 return;
1317 }
1318
1319 /* if we are implementing RTS/CTS, toggle that line */
1320 if (C_CRTSCTS(tty)) {
1321 mos7720_port->shadowMCR |= UART_MCR_RTS;
1322 write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
1323 mos7720_port->shadowMCR);
1324 }
1325}
1326
1327/* FIXME: this function does not work */
1328static int set_higher_rates(struct moschip_port *mos7720_port,
1329 unsigned int baud)
1330{
1331 struct usb_serial_port *port;
1332 struct usb_serial *serial;
1333 int port_number;
1334 enum mos_regs sp_reg;
1335 if (mos7720_port == NULL)
1336 return -EINVAL;
1337
1338 port = mos7720_port->port;
1339 serial = port->serial;
1340
1341 /***********************************************
1342 * Init Sequence for higher rates
1343 ***********************************************/
1344 dev_dbg(&port->dev, "Sending Setting Commands ..........\n");
1345 port_number = port->port_number;
1346
1347 write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
1348 write_mos_reg(serial, port_number, MOS7720_FCR, 0x00);
1349 write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf);
1350 mos7720_port->shadowMCR = 0x0b;
1351 write_mos_reg(serial, port_number, MOS7720_MCR,
1352 mos7720_port->shadowMCR);
1353 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 0x00);
1354
1355 /***********************************************
1356 * Set for higher rates *
1357 ***********************************************/
1358 /* writing baud rate verbatum into uart clock field clearly not right */
1359 if (port_number == 0)
1360 sp_reg = MOS7720_SP1_REG;
1361 else
1362 sp_reg = MOS7720_SP2_REG;
1363 write_mos_reg(serial, dummy, sp_reg, baud * 0x10);
1364 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 0x03);
1365 mos7720_port->shadowMCR = 0x2b;
1366 write_mos_reg(serial, port_number, MOS7720_MCR,
1367 mos7720_port->shadowMCR);
1368
1369 /***********************************************
1370 * Set DLL/DLM
1371 ***********************************************/
1372 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1373 write_mos_reg(serial, port_number, MOS7720_LCR,
1374 mos7720_port->shadowLCR);
1375 write_mos_reg(serial, port_number, MOS7720_DLL, 0x01);
1376 write_mos_reg(serial, port_number, MOS7720_DLM, 0x00);
1377 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1378 write_mos_reg(serial, port_number, MOS7720_LCR,
1379 mos7720_port->shadowLCR);
1380
1381 return 0;
1382}
1383
1384/* baud rate information */
1385struct divisor_table_entry {
1386 __u32 baudrate;
1387 __u16 divisor;
1388};
1389
1390/* Define table of divisors for moschip 7720 hardware *
1391 * These assume a 3.6864MHz crystal, the standard /16, and *
1392 * MCR.7 = 0. */
1393static struct divisor_table_entry divisor_table[] = {
1394 { 50, 2304},
1395 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */
1396 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */
1397 { 150, 768},
1398 { 300, 384},
1399 { 600, 192},
1400 { 1200, 96},
1401 { 1800, 64},
1402 { 2400, 48},
1403 { 4800, 24},
1404 { 7200, 16},
1405 { 9600, 12},
1406 { 19200, 6},
1407 { 38400, 3},
1408 { 57600, 2},
1409 { 115200, 1},
1410};
1411
1412/*****************************************************************************
1413 * calc_baud_rate_divisor
1414 * this function calculates the proper baud rate divisor for the specified
1415 * baud rate.
1416 *****************************************************************************/
1417static int calc_baud_rate_divisor(struct usb_serial_port *port, int baudrate, int *divisor)
1418{
1419 int i;
1420 __u16 custom;
1421 __u16 round1;
1422 __u16 round;
1423
1424
1425 dev_dbg(&port->dev, "%s - %d\n", __func__, baudrate);
1426
1427 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) {
1428 if (divisor_table[i].baudrate == baudrate) {
1429 *divisor = divisor_table[i].divisor;
1430 return 0;
1431 }
1432 }
1433
1434 /* After trying for all the standard baud rates *
1435 * Try calculating the divisor for this baud rate */
1436 if (baudrate > 75 && baudrate < 230400) {
1437 /* get the divisor */
1438 custom = (__u16)(230400L / baudrate);
1439
1440 /* Check for round off */
1441 round1 = (__u16)(2304000L / baudrate);
1442 round = (__u16)(round1 - (custom * 10));
1443 if (round > 4)
1444 custom++;
1445 *divisor = custom;
1446
1447 dev_dbg(&port->dev, "Baud %d = %d\n", baudrate, custom);
1448 return 0;
1449 }
1450
1451 dev_dbg(&port->dev, "Baud calculation Failed...\n");
1452 return -EINVAL;
1453}
1454
1455/*
1456 * send_cmd_write_baud_rate
1457 * this function sends the proper command to change the baud rate of the
1458 * specified port.
1459 */
1460static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port,
1461 int baudrate)
1462{
1463 struct usb_serial_port *port;
1464 struct usb_serial *serial;
1465 int divisor;
1466 int status;
1467 unsigned char number;
1468
1469 if (mos7720_port == NULL)
1470 return -1;
1471
1472 port = mos7720_port->port;
1473 serial = port->serial;
1474
1475 number = port->port_number;
1476 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudrate);
1477
1478 /* Calculate the Divisor */
1479 status = calc_baud_rate_divisor(port, baudrate, &divisor);
1480 if (status) {
1481 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1482 return status;
1483 }
1484
1485 /* Enable access to divisor latch */
1486 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1487 write_mos_reg(serial, number, MOS7720_LCR, mos7720_port->shadowLCR);
1488
1489 /* Write the divisor */
1490 write_mos_reg(serial, number, MOS7720_DLL, (__u8)(divisor & 0xff));
1491 write_mos_reg(serial, number, MOS7720_DLM,
1492 (__u8)((divisor & 0xff00) >> 8));
1493
1494 /* Disable access to divisor latch */
1495 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1496 write_mos_reg(serial, number, MOS7720_LCR, mos7720_port->shadowLCR);
1497
1498 return status;
1499}
1500
1501/*
1502 * change_port_settings
1503 * This routine is called to set the UART on the device to match
1504 * the specified new settings.
1505 */
1506static void change_port_settings(struct tty_struct *tty,
1507 struct moschip_port *mos7720_port,
1508 struct ktermios *old_termios)
1509{
1510 struct usb_serial_port *port;
1511 struct usb_serial *serial;
1512 int baud;
1513 unsigned cflag;
1514 unsigned iflag;
1515 __u8 mask = 0xff;
1516 __u8 lData;
1517 __u8 lParity;
1518 __u8 lStop;
1519 int status;
1520 int port_number;
1521
1522 if (mos7720_port == NULL)
1523 return ;
1524
1525 port = mos7720_port->port;
1526 serial = port->serial;
1527 port_number = port->port_number;
1528
1529 if (!mos7720_port->open) {
1530 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1531 return;
1532 }
1533
1534 lData = UART_LCR_WLEN8;
1535 lStop = 0x00; /* 1 stop bit */
1536 lParity = 0x00; /* No parity */
1537
1538 cflag = tty->termios.c_cflag;
1539 iflag = tty->termios.c_iflag;
1540
1541 /* Change the number of bits */
1542 switch (cflag & CSIZE) {
1543 case CS5:
1544 lData = UART_LCR_WLEN5;
1545 mask = 0x1f;
1546 break;
1547
1548 case CS6:
1549 lData = UART_LCR_WLEN6;
1550 mask = 0x3f;
1551 break;
1552
1553 case CS7:
1554 lData = UART_LCR_WLEN7;
1555 mask = 0x7f;
1556 break;
1557 default:
1558 case CS8:
1559 lData = UART_LCR_WLEN8;
1560 break;
1561 }
1562
1563 /* Change the Parity bit */
1564 if (cflag & PARENB) {
1565 if (cflag & PARODD) {
1566 lParity = UART_LCR_PARITY;
1567 dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1568 } else {
1569 lParity = (UART_LCR_EPAR | UART_LCR_PARITY);
1570 dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1571 }
1572
1573 } else {
1574 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1575 }
1576
1577 if (cflag & CMSPAR)
1578 lParity = lParity | 0x20;
1579
1580 /* Change the Stop bit */
1581 if (cflag & CSTOPB) {
1582 lStop = UART_LCR_STOP;
1583 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1584 } else {
1585 lStop = 0x00;
1586 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1587 }
1588
1589#define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
1590#define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
1591#define LCR_PAR_MASK 0x38 /* Mask for parity field */
1592
1593 /* Update the LCR with the correct value */
1594 mos7720_port->shadowLCR &=
1595 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1596 mos7720_port->shadowLCR |= (lData | lParity | lStop);
1597
1598
1599 /* Disable Interrupts */
1600 write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
1601 write_mos_reg(serial, port_number, MOS7720_FCR, 0x00);
1602 write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf);
1603
1604 /* Send the updated LCR value to the mos7720 */
1605 write_mos_reg(serial, port_number, MOS7720_LCR,
1606 mos7720_port->shadowLCR);
1607 mos7720_port->shadowMCR = 0x0b;
1608 write_mos_reg(serial, port_number, MOS7720_MCR,
1609 mos7720_port->shadowMCR);
1610
1611 /* set up the MCR register and send it to the mos7720 */
1612 mos7720_port->shadowMCR = UART_MCR_OUT2;
1613 if (cflag & CBAUD)
1614 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS);
1615
1616 if (cflag & CRTSCTS) {
1617 mos7720_port->shadowMCR |= (UART_MCR_XONANY);
1618 /* To set hardware flow control to the specified *
1619 * serial port, in SP1/2_CONTROL_REG */
1620 if (port_number)
1621 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG,
1622 0x01);
1623 else
1624 write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG,
1625 0x02);
1626
1627 } else
1628 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY);
1629
1630 write_mos_reg(serial, port_number, MOS7720_MCR,
1631 mos7720_port->shadowMCR);
1632
1633 /* Determine divisor based on baud rate */
1634 baud = tty_get_baud_rate(tty);
1635 if (!baud) {
1636 /* pick a default, any default... */
1637 dev_dbg(&port->dev, "Picked default baud...\n");
1638 baud = 9600;
1639 }
1640
1641 if (baud >= 230400) {
1642 set_higher_rates(mos7720_port, baud);
1643 /* Enable Interrupts */
1644 write_mos_reg(serial, port_number, MOS7720_IER, 0x0c);
1645 return;
1646 }
1647
1648 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1649 status = send_cmd_write_baud_rate(mos7720_port, baud);
1650 /* FIXME: needs to write actual resulting baud back not just
1651 blindly do so */
1652 if (cflag & CBAUD)
1653 tty_encode_baud_rate(tty, baud, baud);
1654 /* Enable Interrupts */
1655 write_mos_reg(serial, port_number, MOS7720_IER, 0x0c);
1656
1657 if (port->read_urb->status != -EINPROGRESS) {
1658 status = usb_submit_urb(port->read_urb, GFP_KERNEL);
1659 if (status)
1660 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status);
1661 }
1662}
1663
1664/*
1665 * mos7720_set_termios
1666 * this function is called by the tty driver when it wants to change the
1667 * termios structure.
1668 */
1669static void mos7720_set_termios(struct tty_struct *tty,
1670 struct usb_serial_port *port, struct ktermios *old_termios)
1671{
1672 int status;
1673 unsigned int cflag;
1674 struct usb_serial *serial;
1675 struct moschip_port *mos7720_port;
1676
1677 serial = port->serial;
1678
1679 mos7720_port = usb_get_serial_port_data(port);
1680
1681 if (mos7720_port == NULL)
1682 return;
1683
1684 if (!mos7720_port->open) {
1685 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1686 return;
1687 }
1688
1689 dev_dbg(&port->dev, "setting termios - ASPIRE\n");
1690
1691 cflag = tty->termios.c_cflag;
1692
1693 dev_dbg(&port->dev, "%s - cflag %08x iflag %08x\n", __func__,
1694 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
1695
1696 dev_dbg(&port->dev, "%s - old cflag %08x old iflag %08x\n", __func__,
1697 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
1698
1699 /* change the port settings to the new ones specified */
1700 change_port_settings(tty, mos7720_port, old_termios);
1701
1702 if (port->read_urb->status != -EINPROGRESS) {
1703 status = usb_submit_urb(port->read_urb, GFP_KERNEL);
1704 if (status)
1705 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status);
1706 }
1707}
1708
1709/*
1710 * get_lsr_info - get line status register info
1711 *
1712 * Purpose: Let user call ioctl() to get info when the UART physically
1713 * is emptied. On bus types like RS485, the transmitter must
1714 * release the bus after transmitting. This must be done when
1715 * the transmit shift register is empty, not be done when the
1716 * transmit holding register is empty. This functionality
1717 * allows an RS485 driver to be written in user space.
1718 */
1719static int get_lsr_info(struct tty_struct *tty,
1720 struct moschip_port *mos7720_port, unsigned int __user *value)
1721{
1722 struct usb_serial_port *port = tty->driver_data;
1723 unsigned int result = 0;
1724 unsigned char data = 0;
1725 int port_number = port->port_number;
1726 int count;
1727
1728 count = mos7720_chars_in_buffer(tty);
1729 if (count == 0) {
1730 read_mos_reg(port->serial, port_number, MOS7720_LSR, &data);
1731 if ((data & (UART_LSR_TEMT | UART_LSR_THRE))
1732 == (UART_LSR_TEMT | UART_LSR_THRE)) {
1733 dev_dbg(&port->dev, "%s -- Empty\n", __func__);
1734 result = TIOCSER_TEMT;
1735 }
1736 }
1737 if (copy_to_user(value, &result, sizeof(int)))
1738 return -EFAULT;
1739 return 0;
1740}
1741
1742static int mos7720_tiocmget(struct tty_struct *tty)
1743{
1744 struct usb_serial_port *port = tty->driver_data;
1745 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1746 unsigned int result = 0;
1747 unsigned int mcr ;
1748 unsigned int msr ;
1749
1750 mcr = mos7720_port->shadowMCR;
1751 msr = mos7720_port->shadowMSR;
1752
1753 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */
1754 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */
1755 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */
1756 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */
1757 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */
1758 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
1759
1760 return result;
1761}
1762
1763static int mos7720_tiocmset(struct tty_struct *tty,
1764 unsigned int set, unsigned int clear)
1765{
1766 struct usb_serial_port *port = tty->driver_data;
1767 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1768 unsigned int mcr ;
1769
1770 mcr = mos7720_port->shadowMCR;
1771
1772 if (set & TIOCM_RTS)
1773 mcr |= UART_MCR_RTS;
1774 if (set & TIOCM_DTR)
1775 mcr |= UART_MCR_DTR;
1776 if (set & TIOCM_LOOP)
1777 mcr |= UART_MCR_LOOP;
1778
1779 if (clear & TIOCM_RTS)
1780 mcr &= ~UART_MCR_RTS;
1781 if (clear & TIOCM_DTR)
1782 mcr &= ~UART_MCR_DTR;
1783 if (clear & TIOCM_LOOP)
1784 mcr &= ~UART_MCR_LOOP;
1785
1786 mos7720_port->shadowMCR = mcr;
1787 write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
1788 mos7720_port->shadowMCR);
1789
1790 return 0;
1791}
1792
1793static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd,
1794 unsigned int __user *value)
1795{
1796 unsigned int mcr;
1797 unsigned int arg;
1798
1799 struct usb_serial_port *port;
1800
1801 if (mos7720_port == NULL)
1802 return -1;
1803
1804 port = (struct usb_serial_port *)mos7720_port->port;
1805 mcr = mos7720_port->shadowMCR;
1806
1807 if (copy_from_user(&arg, value, sizeof(int)))
1808 return -EFAULT;
1809
1810 switch (cmd) {
1811 case TIOCMBIS:
1812 if (arg & TIOCM_RTS)
1813 mcr |= UART_MCR_RTS;
1814 if (arg & TIOCM_DTR)
1815 mcr |= UART_MCR_RTS;
1816 if (arg & TIOCM_LOOP)
1817 mcr |= UART_MCR_LOOP;
1818 break;
1819
1820 case TIOCMBIC:
1821 if (arg & TIOCM_RTS)
1822 mcr &= ~UART_MCR_RTS;
1823 if (arg & TIOCM_DTR)
1824 mcr &= ~UART_MCR_RTS;
1825 if (arg & TIOCM_LOOP)
1826 mcr &= ~UART_MCR_LOOP;
1827 break;
1828
1829 }
1830
1831 mos7720_port->shadowMCR = mcr;
1832 write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
1833 mos7720_port->shadowMCR);
1834
1835 return 0;
1836}
1837
1838static int get_serial_info(struct moschip_port *mos7720_port,
1839 struct serial_struct __user *retinfo)
1840{
1841 struct serial_struct tmp;
1842
1843 memset(&tmp, 0, sizeof(tmp));
1844
1845 tmp.type = PORT_16550A;
1846 tmp.line = mos7720_port->port->minor;
1847 tmp.port = mos7720_port->port->port_number;
1848 tmp.irq = 0;
1849 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
1850 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1851 tmp.baud_base = 9600;
1852 tmp.close_delay = 5*HZ;
1853 tmp.closing_wait = 30*HZ;
1854
1855 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1856 return -EFAULT;
1857 return 0;
1858}
1859
1860static int mos7720_ioctl(struct tty_struct *tty,
1861 unsigned int cmd, unsigned long arg)
1862{
1863 struct usb_serial_port *port = tty->driver_data;
1864 struct moschip_port *mos7720_port;
1865
1866 mos7720_port = usb_get_serial_port_data(port);
1867 if (mos7720_port == NULL)
1868 return -ENODEV;
1869
1870 switch (cmd) {
1871 case TIOCSERGETLSR:
1872 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
1873 return get_lsr_info(tty, mos7720_port,
1874 (unsigned int __user *)arg);
1875
1876 /* FIXME: These should be using the mode methods */
1877 case TIOCMBIS:
1878 case TIOCMBIC:
1879 dev_dbg(&port->dev, "%s TIOCMSET/TIOCMBIC/TIOCMSET\n", __func__);
1880 return set_modem_info(mos7720_port, cmd,
1881 (unsigned int __user *)arg);
1882
1883 case TIOCGSERIAL:
1884 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
1885 return get_serial_info(mos7720_port,
1886 (struct serial_struct __user *)arg);
1887 }
1888
1889 return -ENOIOCTLCMD;
1890}
1891
1892static int mos7720_startup(struct usb_serial *serial)
1893{
1894 struct usb_device *dev;
1895 char data;
1896 u16 product;
1897 int ret_val;
1898
1899 if (serial->num_bulk_in < 2 || serial->num_bulk_out < 2) {
1900 dev_err(&serial->interface->dev, "missing bulk endpoints\n");
1901 return -ENODEV;
1902 }
1903
1904 product = le16_to_cpu(serial->dev->descriptor.idProduct);
1905 dev = serial->dev;
1906
1907 /*
1908 * The 7715 uses the first bulk in/out endpoint pair for the parallel
1909 * port, and the second for the serial port. Because the usbserial core
1910 * assumes both pairs are serial ports, we must engage in a bit of
1911 * subterfuge and swap the pointers for ports 0 and 1 in order to make
1912 * port 0 point to the serial port. However, both moschip devices use a
1913 * single interrupt-in endpoint for both ports (as mentioned a little
1914 * further down), and this endpoint was assigned to port 0. So after
1915 * the swap, we must copy the interrupt endpoint elements from port 1
1916 * (as newly assigned) to port 0, and null out port 1 pointers.
1917 */
1918 if (product == MOSCHIP_DEVICE_ID_7715) {
1919 struct usb_serial_port *tmp = serial->port[0];
1920 serial->port[0] = serial->port[1];
1921 serial->port[1] = tmp;
1922 serial->port[0]->interrupt_in_urb = tmp->interrupt_in_urb;
1923 serial->port[0]->interrupt_in_buffer = tmp->interrupt_in_buffer;
1924 serial->port[0]->interrupt_in_endpointAddress =
1925 tmp->interrupt_in_endpointAddress;
1926 serial->port[1]->interrupt_in_urb = NULL;
1927 serial->port[1]->interrupt_in_buffer = NULL;
1928
1929 if (serial->port[0]->interrupt_in_urb) {
1930 struct urb *urb = serial->port[0]->interrupt_in_urb;
1931
1932 urb->complete = mos7715_interrupt_callback;
1933 }
1934 }
1935
1936 /* setting configuration feature to one */
1937 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1938 (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5000);
1939
1940#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
1941 if (product == MOSCHIP_DEVICE_ID_7715) {
1942 ret_val = mos7715_parport_init(serial);
1943 if (ret_val < 0)
1944 return ret_val;
1945 }
1946#endif
1947 /* start the interrupt urb */
1948 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL);
1949 if (ret_val) {
1950 dev_err(&dev->dev, "failed to submit interrupt urb: %d\n",
1951 ret_val);
1952 }
1953
1954 /* LSR For Port 1 */
1955 read_mos_reg(serial, 0, MOS7720_LSR, &data);
1956 dev_dbg(&dev->dev, "LSR:%x\n", data);
1957
1958 return 0;
1959}
1960
1961static void mos7720_release(struct usb_serial *serial)
1962{
1963 usb_kill_urb(serial->port[0]->interrupt_in_urb);
1964
1965#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
1966 /* close the parallel port */
1967
1968 if (le16_to_cpu(serial->dev->descriptor.idProduct)
1969 == MOSCHIP_DEVICE_ID_7715) {
1970 struct urbtracker *urbtrack;
1971 unsigned long flags;
1972 struct mos7715_parport *mos_parport =
1973 usb_get_serial_data(serial);
1974
1975 /* prevent NULL ptr dereference in port callbacks */
1976 spin_lock(&release_lock);
1977 mos_parport->pp->private_data = NULL;
1978 spin_unlock(&release_lock);
1979
1980 /* wait for synchronous usb calls to return */
1981 if (mos_parport->msg_pending)
1982 wait_for_completion_timeout(&mos_parport->syncmsg_compl,
1983 msecs_to_jiffies(MOS_WDR_TIMEOUT));
1984
1985 parport_remove_port(mos_parport->pp);
1986 usb_set_serial_data(serial, NULL);
1987 mos_parport->serial = NULL;
1988
1989 /* if tasklet currently scheduled, wait for it to complete */
1990 tasklet_kill(&mos_parport->urb_tasklet);
1991
1992 /* unlink any urbs sent by the tasklet */
1993 spin_lock_irqsave(&mos_parport->listlock, flags);
1994 list_for_each_entry(urbtrack,
1995 &mos_parport->active_urbs,
1996 urblist_entry)
1997 usb_unlink_urb(urbtrack->urb);
1998 spin_unlock_irqrestore(&mos_parport->listlock, flags);
1999 parport_del_port(mos_parport->pp);
2000
2001 kref_put(&mos_parport->ref_count, destroy_mos_parport);
2002 }
2003#endif
2004}
2005
2006static int mos7720_port_probe(struct usb_serial_port *port)
2007{
2008 struct moschip_port *mos7720_port;
2009
2010 mos7720_port = kzalloc(sizeof(*mos7720_port), GFP_KERNEL);
2011 if (!mos7720_port)
2012 return -ENOMEM;
2013
2014 mos7720_port->port = port;
2015
2016 usb_set_serial_port_data(port, mos7720_port);
2017
2018 return 0;
2019}
2020
2021static int mos7720_port_remove(struct usb_serial_port *port)
2022{
2023 struct moschip_port *mos7720_port;
2024
2025 mos7720_port = usb_get_serial_port_data(port);
2026 kfree(mos7720_port);
2027
2028 return 0;
2029}
2030
2031static struct usb_serial_driver moschip7720_2port_driver = {
2032 .driver = {
2033 .owner = THIS_MODULE,
2034 .name = "moschip7720",
2035 },
2036 .description = "Moschip 2 port adapter",
2037 .id_table = id_table,
2038 .calc_num_ports = mos77xx_calc_num_ports,
2039 .open = mos7720_open,
2040 .close = mos7720_close,
2041 .throttle = mos7720_throttle,
2042 .unthrottle = mos7720_unthrottle,
2043 .attach = mos7720_startup,
2044 .release = mos7720_release,
2045 .port_probe = mos7720_port_probe,
2046 .port_remove = mos7720_port_remove,
2047 .ioctl = mos7720_ioctl,
2048 .tiocmget = mos7720_tiocmget,
2049 .tiocmset = mos7720_tiocmset,
2050 .set_termios = mos7720_set_termios,
2051 .write = mos7720_write,
2052 .write_room = mos7720_write_room,
2053 .chars_in_buffer = mos7720_chars_in_buffer,
2054 .break_ctl = mos7720_break,
2055 .read_bulk_callback = mos7720_bulk_in_callback,
2056 .read_int_callback = mos7720_interrupt_callback,
2057};
2058
2059static struct usb_serial_driver * const serial_drivers[] = {
2060 &moschip7720_2port_driver, NULL
2061};
2062
2063module_usb_serial_driver(serial_drivers, id_table);
2064
2065MODULE_AUTHOR(DRIVER_AUTHOR);
2066MODULE_DESCRIPTION(DRIVER_DESC);
2067MODULE_LICENSE("GPL");