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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 .name = "moschip7720",
1728 },
1729 .description = "Moschip 2 port adapter",
1730 .id_table = id_table,
1731 .num_bulk_in = 2,
1732 .num_bulk_out = 2,
1733 .num_interrupt_in = 1,
1734 .calc_num_ports = mos77xx_calc_num_ports,
1735 .open = mos7720_open,
1736 .close = mos7720_close,
1737 .throttle = mos7720_throttle,
1738 .unthrottle = mos7720_unthrottle,
1739 .attach = mos7720_startup,
1740 .release = mos7720_release,
1741 .port_probe = mos7720_port_probe,
1742 .port_remove = mos7720_port_remove,
1743 .ioctl = mos7720_ioctl,
1744 .tiocmget = mos7720_tiocmget,
1745 .tiocmset = mos7720_tiocmset,
1746 .set_termios = mos7720_set_termios,
1747 .write = mos7720_write,
1748 .write_room = mos7720_write_room,
1749 .chars_in_buffer = mos7720_chars_in_buffer,
1750 .break_ctl = mos7720_break,
1751 .read_bulk_callback = mos7720_bulk_in_callback,
1752 .read_int_callback = mos7720_interrupt_callback,
1753};
1754
1755static struct usb_serial_driver * const serial_drivers[] = {
1756 &moschip7720_2port_driver, NULL
1757};
1758
1759module_usb_serial_driver(serial_drivers, id_table);
1760
1761MODULE_AUTHOR(DRIVER_AUTHOR);
1762MODULE_DESCRIPTION(DRIVER_DESC);
1763MODULE_LICENSE("GPL v2");
1/*
2 * mos7720.c
3 * Controls the Moschip 7720 usb to dual port serial convertor
4 *
5 * Copyright 2006 Moschip Semiconductor Tech. Ltd.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, version 2 of the License.
10 *
11 * Developed by:
12 * Vijaya Kumar <vijaykumar.gn@gmail.com>
13 * Ajay Kumar <naanuajay@yahoo.com>
14 * Gurudeva <ngurudeva@yahoo.com>
15 *
16 * Cleaned up from the original by:
17 * Greg Kroah-Hartman <gregkh@suse.de>
18 *
19 * Originally based on drivers/usb/serial/io_edgeport.c which is:
20 * Copyright (C) 2000 Inside Out Networks, All rights reserved.
21 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
22 */
23#include <linux/kernel.h>
24#include <linux/errno.h>
25#include <linux/init.h>
26#include <linux/slab.h>
27#include <linux/tty.h>
28#include <linux/tty_driver.h>
29#include <linux/tty_flip.h>
30#include <linux/module.h>
31#include <linux/spinlock.h>
32#include <linux/serial.h>
33#include <linux/serial_reg.h>
34#include <linux/usb.h>
35#include <linux/usb/serial.h>
36#include <linux/uaccess.h>
37#include <linux/parport.h>
38
39/*
40 * Version Information
41 */
42#define DRIVER_VERSION "2.1"
43#define DRIVER_AUTHOR "Aspire Communications pvt Ltd."
44#define DRIVER_DESC "Moschip USB Serial Driver"
45
46/* default urb timeout */
47#define MOS_WDR_TIMEOUT (HZ * 5)
48
49#define MOS_MAX_PORT 0x02
50#define MOS_WRITE 0x0E
51#define MOS_READ 0x0D
52
53/* Interrupt Rotinue Defines */
54#define SERIAL_IIR_RLS 0x06
55#define SERIAL_IIR_RDA 0x04
56#define SERIAL_IIR_CTI 0x0c
57#define SERIAL_IIR_THR 0x02
58#define SERIAL_IIR_MS 0x00
59
60#define NUM_URBS 16 /* URB Count */
61#define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
62
63/* This structure holds all of the local serial port information */
64struct moschip_port {
65 __u8 shadowLCR; /* last LCR value received */
66 __u8 shadowMCR; /* last MCR value received */
67 __u8 shadowMSR; /* last MSR value received */
68 char open;
69 struct async_icount icount;
70 struct usb_serial_port *port; /* loop back to the owner */
71 struct urb *write_urb_pool[NUM_URBS];
72};
73
74static bool debug;
75
76static struct usb_serial_driver moschip7720_2port_driver;
77
78#define USB_VENDOR_ID_MOSCHIP 0x9710
79#define MOSCHIP_DEVICE_ID_7720 0x7720
80#define MOSCHIP_DEVICE_ID_7715 0x7715
81
82static const struct usb_device_id id_table[] = {
83 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7720) },
84 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7715) },
85 { } /* terminating entry */
86};
87MODULE_DEVICE_TABLE(usb, id_table);
88
89#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
90
91/* initial values for parport regs */
92#define DCR_INIT_VAL 0x0c /* SLCTIN, nINIT */
93#define ECR_INIT_VAL 0x00 /* SPP mode */
94
95struct urbtracker {
96 struct mos7715_parport *mos_parport;
97 struct list_head urblist_entry;
98 struct kref ref_count;
99 struct urb *urb;
100};
101
102enum mos7715_pp_modes {
103 SPP = 0<<5,
104 PS2 = 1<<5, /* moschip calls this 'NIBBLE' mode */
105 PPF = 2<<5, /* moschip calls this 'CB-FIFO mode */
106};
107
108struct mos7715_parport {
109 struct parport *pp; /* back to containing struct */
110 struct kref ref_count; /* to instance of this struct */
111 struct list_head deferred_urbs; /* list deferred async urbs */
112 struct list_head active_urbs; /* list async urbs in flight */
113 spinlock_t listlock; /* protects list access */
114 bool msg_pending; /* usb sync call pending */
115 struct completion syncmsg_compl; /* usb sync call completed */
116 struct tasklet_struct urb_tasklet; /* for sending deferred urbs */
117 struct usb_serial *serial; /* back to containing struct */
118 __u8 shadowECR; /* parallel port regs... */
119 __u8 shadowDCR;
120 atomic_t shadowDSR; /* updated in int-in callback */
121};
122
123/* lock guards against dereferencing NULL ptr in parport ops callbacks */
124static DEFINE_SPINLOCK(release_lock);
125
126#endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
127
128static const unsigned int dummy; /* for clarity in register access fns */
129
130enum mos_regs {
131 THR, /* serial port regs */
132 RHR,
133 IER,
134 FCR,
135 ISR,
136 LCR,
137 MCR,
138 LSR,
139 MSR,
140 SPR,
141 DLL,
142 DLM,
143 DPR, /* parallel port regs */
144 DSR,
145 DCR,
146 ECR,
147 SP1_REG, /* device control regs */
148 SP2_REG, /* serial port 2 (7720 only) */
149 PP_REG,
150 SP_CONTROL_REG,
151};
152
153/*
154 * Return the correct value for the Windex field of the setup packet
155 * for a control endpoint message. See the 7715 datasheet.
156 */
157static inline __u16 get_reg_index(enum mos_regs reg)
158{
159 static const __u16 mos7715_index_lookup_table[] = {
160 0x00, /* THR */
161 0x00, /* RHR */
162 0x01, /* IER */
163 0x02, /* FCR */
164 0x02, /* ISR */
165 0x03, /* LCR */
166 0x04, /* MCR */
167 0x05, /* LSR */
168 0x06, /* MSR */
169 0x07, /* SPR */
170 0x00, /* DLL */
171 0x01, /* DLM */
172 0x00, /* DPR */
173 0x01, /* DSR */
174 0x02, /* DCR */
175 0x0a, /* ECR */
176 0x01, /* SP1_REG */
177 0x02, /* SP2_REG (7720 only) */
178 0x04, /* PP_REG (7715 only) */
179 0x08, /* SP_CONTROL_REG */
180 };
181 return mos7715_index_lookup_table[reg];
182}
183
184/*
185 * Return the correct value for the upper byte of the Wvalue field of
186 * the setup packet for a control endpoint message.
187 */
188static inline __u16 get_reg_value(enum mos_regs reg,
189 unsigned int serial_portnum)
190{
191 if (reg >= SP1_REG) /* control reg */
192 return 0x0000;
193
194 else if (reg >= DPR) /* parallel port reg (7715 only) */
195 return 0x0100;
196
197 else /* serial port reg */
198 return (serial_portnum + 2) << 8;
199}
200
201/*
202 * Write data byte to the specified device register. The data is embedded in
203 * the value field of the setup packet. serial_portnum is ignored for registers
204 * not specific to a particular serial port.
205 */
206static int write_mos_reg(struct usb_serial *serial, unsigned int serial_portnum,
207 enum mos_regs reg, __u8 data)
208{
209 struct usb_device *usbdev = serial->dev;
210 unsigned int pipe = usb_sndctrlpipe(usbdev, 0);
211 __u8 request = (__u8)0x0e;
212 __u8 requesttype = (__u8)0x40;
213 __u16 index = get_reg_index(reg);
214 __u16 value = get_reg_value(reg, serial_portnum) + data;
215 int status = usb_control_msg(usbdev, pipe, request, requesttype, value,
216 index, NULL, 0, MOS_WDR_TIMEOUT);
217 if (status < 0)
218 dev_err(&usbdev->dev,
219 "mos7720: usb_control_msg() failed: %d", status);
220 return status;
221}
222
223/*
224 * Read data byte from the specified device register. The data returned by the
225 * device is embedded in the value field of the setup packet. serial_portnum is
226 * ignored for registers that are not specific to a particular serial port.
227 */
228static int read_mos_reg(struct usb_serial *serial, unsigned int serial_portnum,
229 enum mos_regs reg, __u8 *data)
230{
231 struct usb_device *usbdev = serial->dev;
232 unsigned int pipe = usb_rcvctrlpipe(usbdev, 0);
233 __u8 request = (__u8)0x0d;
234 __u8 requesttype = (__u8)0xc0;
235 __u16 index = get_reg_index(reg);
236 __u16 value = get_reg_value(reg, serial_portnum);
237 int status = usb_control_msg(usbdev, pipe, request, requesttype, value,
238 index, data, 1, MOS_WDR_TIMEOUT);
239 if (status < 0)
240 dev_err(&usbdev->dev,
241 "mos7720: usb_control_msg() failed: %d", status);
242 return status;
243}
244
245#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
246
247static inline int mos7715_change_mode(struct mos7715_parport *mos_parport,
248 enum mos7715_pp_modes mode)
249{
250 mos_parport->shadowECR = mode;
251 write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR);
252 return 0;
253}
254
255static void destroy_mos_parport(struct kref *kref)
256{
257 struct mos7715_parport *mos_parport =
258 container_of(kref, struct mos7715_parport, ref_count);
259
260 kfree(mos_parport);
261}
262
263static void destroy_urbtracker(struct kref *kref)
264{
265 struct urbtracker *urbtrack =
266 container_of(kref, struct urbtracker, ref_count);
267 struct mos7715_parport *mos_parport = urbtrack->mos_parport;
268
269 usb_free_urb(urbtrack->urb);
270 kfree(urbtrack);
271 kref_put(&mos_parport->ref_count, destroy_mos_parport);
272}
273
274/*
275 * This runs as a tasklet when sending an urb in a non-blocking parallel
276 * port callback had to be deferred because the disconnect mutex could not be
277 * obtained at the time.
278 */
279static void send_deferred_urbs(unsigned long _mos_parport)
280{
281 int ret_val;
282 unsigned long flags;
283 struct mos7715_parport *mos_parport = (void *)_mos_parport;
284 struct urbtracker *urbtrack;
285 struct list_head *cursor, *next;
286
287 /* if release function ran, game over */
288 if (unlikely(mos_parport->serial == NULL))
289 return;
290
291 /* try again to get the mutex */
292 if (!mutex_trylock(&mos_parport->serial->disc_mutex)) {
293 dbg("%s: rescheduling tasklet", __func__);
294 tasklet_schedule(&mos_parport->urb_tasklet);
295 return;
296 }
297
298 /* if device disconnected, game over */
299 if (unlikely(mos_parport->serial->disconnected)) {
300 mutex_unlock(&mos_parport->serial->disc_mutex);
301 return;
302 }
303
304 spin_lock_irqsave(&mos_parport->listlock, flags);
305 if (list_empty(&mos_parport->deferred_urbs)) {
306 spin_unlock_irqrestore(&mos_parport->listlock, flags);
307 mutex_unlock(&mos_parport->serial->disc_mutex);
308 dbg("%s: deferred_urbs list empty", __func__);
309 return;
310 }
311
312 /* move contents of deferred_urbs list to active_urbs list and submit */
313 list_for_each_safe(cursor, next, &mos_parport->deferred_urbs)
314 list_move_tail(cursor, &mos_parport->active_urbs);
315 list_for_each_entry(urbtrack, &mos_parport->active_urbs,
316 urblist_entry) {
317 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
318 dbg("%s: urb submitted", __func__);
319 if (ret_val) {
320 dev_err(&mos_parport->serial->dev->dev,
321 "usb_submit_urb() failed: %d", ret_val);
322 list_del(&urbtrack->urblist_entry);
323 kref_put(&urbtrack->ref_count, destroy_urbtracker);
324 }
325 }
326 spin_unlock_irqrestore(&mos_parport->listlock, flags);
327 mutex_unlock(&mos_parport->serial->disc_mutex);
328}
329
330/* callback for parallel port control urbs submitted asynchronously */
331static void async_complete(struct urb *urb)
332{
333 struct urbtracker *urbtrack = urb->context;
334 int status = urb->status;
335
336 if (unlikely(status))
337 dbg("%s - nonzero urb status received: %d", __func__, status);
338
339 /* remove the urbtracker from the active_urbs list */
340 spin_lock(&urbtrack->mos_parport->listlock);
341 list_del(&urbtrack->urblist_entry);
342 spin_unlock(&urbtrack->mos_parport->listlock);
343 kref_put(&urbtrack->ref_count, destroy_urbtracker);
344}
345
346static int write_parport_reg_nonblock(struct mos7715_parport *mos_parport,
347 enum mos_regs reg, __u8 data)
348{
349 struct urbtracker *urbtrack;
350 int ret_val;
351 unsigned long flags;
352 struct usb_ctrlrequest setup;
353 struct usb_serial *serial = mos_parport->serial;
354 struct usb_device *usbdev = serial->dev;
355
356 /* create and initialize the control urb and containing urbtracker */
357 urbtrack = kmalloc(sizeof(struct urbtracker), GFP_ATOMIC);
358 if (urbtrack == NULL) {
359 dev_err(&usbdev->dev, "out of memory");
360 return -ENOMEM;
361 }
362 kref_get(&mos_parport->ref_count);
363 urbtrack->mos_parport = mos_parport;
364 urbtrack->urb = usb_alloc_urb(0, GFP_ATOMIC);
365 if (urbtrack->urb == NULL) {
366 dev_err(&usbdev->dev, "out of urbs");
367 kfree(urbtrack);
368 return -ENOMEM;
369 }
370 setup.bRequestType = (__u8)0x40;
371 setup.bRequest = (__u8)0x0e;
372 setup.wValue = get_reg_value(reg, dummy);
373 setup.wIndex = get_reg_index(reg);
374 setup.wLength = 0;
375 usb_fill_control_urb(urbtrack->urb, usbdev,
376 usb_sndctrlpipe(usbdev, 0),
377 (unsigned char *)&setup,
378 NULL, 0, async_complete, urbtrack);
379 kref_init(&urbtrack->ref_count);
380 INIT_LIST_HEAD(&urbtrack->urblist_entry);
381
382 /*
383 * get the disconnect mutex, or add tracker to the deferred_urbs list
384 * and schedule a tasklet to try again later
385 */
386 if (!mutex_trylock(&serial->disc_mutex)) {
387 spin_lock_irqsave(&mos_parport->listlock, flags);
388 list_add_tail(&urbtrack->urblist_entry,
389 &mos_parport->deferred_urbs);
390 spin_unlock_irqrestore(&mos_parport->listlock, flags);
391 tasklet_schedule(&mos_parport->urb_tasklet);
392 dbg("tasklet scheduled");
393 return 0;
394 }
395
396 /* bail if device disconnected */
397 if (serial->disconnected) {
398 kref_put(&urbtrack->ref_count, destroy_urbtracker);
399 mutex_unlock(&serial->disc_mutex);
400 return -ENODEV;
401 }
402
403 /* add the tracker to the active_urbs list and submit */
404 spin_lock_irqsave(&mos_parport->listlock, flags);
405 list_add_tail(&urbtrack->urblist_entry, &mos_parport->active_urbs);
406 spin_unlock_irqrestore(&mos_parport->listlock, flags);
407 ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
408 mutex_unlock(&serial->disc_mutex);
409 if (ret_val) {
410 dev_err(&usbdev->dev,
411 "%s: submit_urb() failed: %d", __func__, ret_val);
412 spin_lock_irqsave(&mos_parport->listlock, flags);
413 list_del(&urbtrack->urblist_entry);
414 spin_unlock_irqrestore(&mos_parport->listlock, flags);
415 kref_put(&urbtrack->ref_count, destroy_urbtracker);
416 return ret_val;
417 }
418 return 0;
419}
420
421/*
422 * This is the the common top part of all parallel port callback operations that
423 * send synchronous messages to the device. This implements convoluted locking
424 * that avoids two scenarios: (1) a port operation is called after usbserial
425 * has called our release function, at which point struct mos7715_parport has
426 * been destroyed, and (2) the device has been disconnected, but usbserial has
427 * not called the release function yet because someone has a serial port open.
428 * The shared release_lock prevents the first, and the mutex and disconnected
429 * flag maintained by usbserial covers the second. We also use the msg_pending
430 * flag to ensure that all synchronous usb messgage calls have completed before
431 * our release function can return.
432 */
433static int parport_prologue(struct parport *pp)
434{
435 struct mos7715_parport *mos_parport;
436
437 spin_lock(&release_lock);
438 mos_parport = pp->private_data;
439 if (unlikely(mos_parport == NULL)) {
440 /* release fn called, port struct destroyed */
441 spin_unlock(&release_lock);
442 return -1;
443 }
444 mos_parport->msg_pending = true; /* synch usb call pending */
445 INIT_COMPLETION(mos_parport->syncmsg_compl);
446 spin_unlock(&release_lock);
447
448 mutex_lock(&mos_parport->serial->disc_mutex);
449 if (mos_parport->serial->disconnected) {
450 /* device disconnected */
451 mutex_unlock(&mos_parport->serial->disc_mutex);
452 mos_parport->msg_pending = false;
453 complete(&mos_parport->syncmsg_compl);
454 return -1;
455 }
456
457 return 0;
458}
459
460/*
461 * This is the the common bottom part of all parallel port functions that send
462 * synchronous messages to the device.
463 */
464static inline void parport_epilogue(struct parport *pp)
465{
466 struct mos7715_parport *mos_parport = pp->private_data;
467 mutex_unlock(&mos_parport->serial->disc_mutex);
468 mos_parport->msg_pending = false;
469 complete(&mos_parport->syncmsg_compl);
470}
471
472static void parport_mos7715_write_data(struct parport *pp, unsigned char d)
473{
474 struct mos7715_parport *mos_parport = pp->private_data;
475
476 if (parport_prologue(pp) < 0)
477 return;
478 mos7715_change_mode(mos_parport, SPP);
479 write_mos_reg(mos_parport->serial, dummy, DPR, (__u8)d);
480 parport_epilogue(pp);
481}
482
483static unsigned char parport_mos7715_read_data(struct parport *pp)
484{
485 struct mos7715_parport *mos_parport = pp->private_data;
486 unsigned char d;
487
488 if (parport_prologue(pp) < 0)
489 return 0;
490 read_mos_reg(mos_parport->serial, dummy, DPR, &d);
491 parport_epilogue(pp);
492 return d;
493}
494
495static void parport_mos7715_write_control(struct parport *pp, unsigned char d)
496{
497 struct mos7715_parport *mos_parport = pp->private_data;
498 __u8 data;
499
500 if (parport_prologue(pp) < 0)
501 return;
502 data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0);
503 write_mos_reg(mos_parport->serial, dummy, DCR, data);
504 mos_parport->shadowDCR = data;
505 parport_epilogue(pp);
506}
507
508static unsigned char parport_mos7715_read_control(struct parport *pp)
509{
510 struct mos7715_parport *mos_parport = pp->private_data;
511 __u8 dcr;
512
513 spin_lock(&release_lock);
514 mos_parport = pp->private_data;
515 if (unlikely(mos_parport == NULL)) {
516 spin_unlock(&release_lock);
517 return 0;
518 }
519 dcr = mos_parport->shadowDCR & 0x0f;
520 spin_unlock(&release_lock);
521 return dcr;
522}
523
524static unsigned char parport_mos7715_frob_control(struct parport *pp,
525 unsigned char mask,
526 unsigned char val)
527{
528 struct mos7715_parport *mos_parport = pp->private_data;
529 __u8 dcr;
530
531 mask &= 0x0f;
532 val &= 0x0f;
533 if (parport_prologue(pp) < 0)
534 return 0;
535 mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val;
536 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
537 dcr = mos_parport->shadowDCR & 0x0f;
538 parport_epilogue(pp);
539 return dcr;
540}
541
542static unsigned char parport_mos7715_read_status(struct parport *pp)
543{
544 unsigned char status;
545 struct mos7715_parport *mos_parport = pp->private_data;
546
547 spin_lock(&release_lock);
548 mos_parport = pp->private_data;
549 if (unlikely(mos_parport == NULL)) { /* release called */
550 spin_unlock(&release_lock);
551 return 0;
552 }
553 status = atomic_read(&mos_parport->shadowDSR) & 0xf8;
554 spin_unlock(&release_lock);
555 return status;
556}
557
558static void parport_mos7715_enable_irq(struct parport *pp)
559{
560}
561
562static void parport_mos7715_disable_irq(struct parport *pp)
563{
564}
565
566static void parport_mos7715_data_forward(struct parport *pp)
567{
568 struct mos7715_parport *mos_parport = pp->private_data;
569
570 if (parport_prologue(pp) < 0)
571 return;
572 mos7715_change_mode(mos_parport, PS2);
573 mos_parport->shadowDCR &= ~0x20;
574 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
575 parport_epilogue(pp);
576}
577
578static void parport_mos7715_data_reverse(struct parport *pp)
579{
580 struct mos7715_parport *mos_parport = pp->private_data;
581
582 if (parport_prologue(pp) < 0)
583 return;
584 mos7715_change_mode(mos_parport, PS2);
585 mos_parport->shadowDCR |= 0x20;
586 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
587 parport_epilogue(pp);
588}
589
590static void parport_mos7715_init_state(struct pardevice *dev,
591 struct parport_state *s)
592{
593 s->u.pc.ctr = DCR_INIT_VAL;
594 s->u.pc.ecr = ECR_INIT_VAL;
595}
596
597/* N.B. Parport core code requires that this function not block */
598static void parport_mos7715_save_state(struct parport *pp,
599 struct parport_state *s)
600{
601 struct mos7715_parport *mos_parport;
602
603 spin_lock(&release_lock);
604 mos_parport = pp->private_data;
605 if (unlikely(mos_parport == NULL)) { /* release called */
606 spin_unlock(&release_lock);
607 return;
608 }
609 s->u.pc.ctr = mos_parport->shadowDCR;
610 s->u.pc.ecr = mos_parport->shadowECR;
611 spin_unlock(&release_lock);
612}
613
614/* N.B. Parport core code requires that this function not block */
615static void parport_mos7715_restore_state(struct parport *pp,
616 struct parport_state *s)
617{
618 struct mos7715_parport *mos_parport;
619
620 spin_lock(&release_lock);
621 mos_parport = pp->private_data;
622 if (unlikely(mos_parport == NULL)) { /* release called */
623 spin_unlock(&release_lock);
624 return;
625 }
626 write_parport_reg_nonblock(mos_parport, DCR, mos_parport->shadowDCR);
627 write_parport_reg_nonblock(mos_parport, ECR, mos_parport->shadowECR);
628 spin_unlock(&release_lock);
629}
630
631static size_t parport_mos7715_write_compat(struct parport *pp,
632 const void *buffer,
633 size_t len, int flags)
634{
635 int retval;
636 struct mos7715_parport *mos_parport = pp->private_data;
637 int actual_len;
638
639 if (parport_prologue(pp) < 0)
640 return 0;
641 mos7715_change_mode(mos_parport, PPF);
642 retval = usb_bulk_msg(mos_parport->serial->dev,
643 usb_sndbulkpipe(mos_parport->serial->dev, 2),
644 (void *)buffer, len, &actual_len,
645 MOS_WDR_TIMEOUT);
646 parport_epilogue(pp);
647 if (retval) {
648 dev_err(&mos_parport->serial->dev->dev,
649 "mos7720: usb_bulk_msg() failed: %d", retval);
650 return 0;
651 }
652 return actual_len;
653}
654
655static struct parport_operations parport_mos7715_ops = {
656 .owner = THIS_MODULE,
657 .write_data = parport_mos7715_write_data,
658 .read_data = parport_mos7715_read_data,
659
660 .write_control = parport_mos7715_write_control,
661 .read_control = parport_mos7715_read_control,
662 .frob_control = parport_mos7715_frob_control,
663
664 .read_status = parport_mos7715_read_status,
665
666 .enable_irq = parport_mos7715_enable_irq,
667 .disable_irq = parport_mos7715_disable_irq,
668
669 .data_forward = parport_mos7715_data_forward,
670 .data_reverse = parport_mos7715_data_reverse,
671
672 .init_state = parport_mos7715_init_state,
673 .save_state = parport_mos7715_save_state,
674 .restore_state = parport_mos7715_restore_state,
675
676 .compat_write_data = parport_mos7715_write_compat,
677
678 .nibble_read_data = parport_ieee1284_read_nibble,
679 .byte_read_data = parport_ieee1284_read_byte,
680};
681
682/*
683 * Allocate and initialize parallel port control struct, initialize
684 * the parallel port hardware device, and register with the parport subsystem.
685 */
686static int mos7715_parport_init(struct usb_serial *serial)
687{
688 struct mos7715_parport *mos_parport;
689
690 /* allocate and initialize parallel port control struct */
691 mos_parport = kzalloc(sizeof(struct mos7715_parport), GFP_KERNEL);
692 if (mos_parport == NULL) {
693 dbg("mos7715_parport_init: kzalloc failed");
694 return -ENOMEM;
695 }
696 mos_parport->msg_pending = false;
697 kref_init(&mos_parport->ref_count);
698 spin_lock_init(&mos_parport->listlock);
699 INIT_LIST_HEAD(&mos_parport->active_urbs);
700 INIT_LIST_HEAD(&mos_parport->deferred_urbs);
701 usb_set_serial_data(serial, mos_parport); /* hijack private pointer */
702 mos_parport->serial = serial;
703 tasklet_init(&mos_parport->urb_tasklet, send_deferred_urbs,
704 (unsigned long) mos_parport);
705 init_completion(&mos_parport->syncmsg_compl);
706
707 /* cycle parallel port reset bit */
708 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x80);
709 write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x00);
710
711 /* initialize device registers */
712 mos_parport->shadowDCR = DCR_INIT_VAL;
713 write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
714 mos_parport->shadowECR = ECR_INIT_VAL;
715 write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR);
716
717 /* register with parport core */
718 mos_parport->pp = parport_register_port(0, PARPORT_IRQ_NONE,
719 PARPORT_DMA_NONE,
720 &parport_mos7715_ops);
721 if (mos_parport->pp == NULL) {
722 dev_err(&serial->interface->dev,
723 "Could not register parport\n");
724 kref_put(&mos_parport->ref_count, destroy_mos_parport);
725 return -EIO;
726 }
727 mos_parport->pp->private_data = mos_parport;
728 mos_parport->pp->modes = PARPORT_MODE_COMPAT | PARPORT_MODE_PCSPP;
729 mos_parport->pp->dev = &serial->interface->dev;
730 parport_announce_port(mos_parport->pp);
731
732 return 0;
733}
734#endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
735
736/*
737 * mos7720_interrupt_callback
738 * this is the callback function for when we have received data on the
739 * interrupt endpoint.
740 */
741static void mos7720_interrupt_callback(struct urb *urb)
742{
743 int result;
744 int length;
745 int status = urb->status;
746 __u8 *data;
747 __u8 sp1;
748 __u8 sp2;
749
750 switch (status) {
751 case 0:
752 /* success */
753 break;
754 case -ECONNRESET:
755 case -ENOENT:
756 case -ESHUTDOWN:
757 /* this urb is terminated, clean up */
758 dbg("%s - urb shutting down with status: %d", __func__,
759 status);
760 return;
761 default:
762 dbg("%s - nonzero urb status received: %d", __func__,
763 status);
764 goto exit;
765 }
766
767 length = urb->actual_length;
768 data = urb->transfer_buffer;
769
770 /* Moschip get 4 bytes
771 * Byte 1 IIR Port 1 (port.number is 0)
772 * Byte 2 IIR Port 2 (port.number is 1)
773 * Byte 3 --------------
774 * Byte 4 FIFO status for both */
775
776 /* the above description is inverted
777 * oneukum 2007-03-14 */
778
779 if (unlikely(length != 4)) {
780 dbg("Wrong data !!!");
781 return;
782 }
783
784 sp1 = data[3];
785 sp2 = data[2];
786
787 if ((sp1 | sp2) & 0x01) {
788 /* No Interrupt Pending in both the ports */
789 dbg("No Interrupt !!!");
790 } else {
791 switch (sp1 & 0x0f) {
792 case SERIAL_IIR_RLS:
793 dbg("Serial Port 1: Receiver status error or address "
794 "bit detected in 9-bit mode\n");
795 break;
796 case SERIAL_IIR_CTI:
797 dbg("Serial Port 1: Receiver time out");
798 break;
799 case SERIAL_IIR_MS:
800 /* dbg("Serial Port 1: Modem status change"); */
801 break;
802 }
803
804 switch (sp2 & 0x0f) {
805 case SERIAL_IIR_RLS:
806 dbg("Serial Port 2: Receiver status error or address "
807 "bit detected in 9-bit mode");
808 break;
809 case SERIAL_IIR_CTI:
810 dbg("Serial Port 2: Receiver time out");
811 break;
812 case SERIAL_IIR_MS:
813 /* dbg("Serial Port 2: Modem status change"); */
814 break;
815 }
816 }
817
818exit:
819 result = usb_submit_urb(urb, GFP_ATOMIC);
820 if (result)
821 dev_err(&urb->dev->dev,
822 "%s - Error %d submitting control urb\n",
823 __func__, result);
824}
825
826/*
827 * mos7715_interrupt_callback
828 * this is the 7715's callback function for when we have received data on
829 * the interrupt endpoint.
830 */
831static void mos7715_interrupt_callback(struct urb *urb)
832{
833 int result;
834 int length;
835 int status = urb->status;
836 __u8 *data;
837 __u8 iir;
838
839 switch (status) {
840 case 0:
841 /* success */
842 break;
843 case -ECONNRESET:
844 case -ENOENT:
845 case -ESHUTDOWN:
846 case -ENODEV:
847 /* this urb is terminated, clean up */
848 dbg("%s - urb shutting down with status: %d", __func__,
849 status);
850 return;
851 default:
852 dbg("%s - nonzero urb status received: %d", __func__,
853 status);
854 goto exit;
855 }
856
857 length = urb->actual_length;
858 data = urb->transfer_buffer;
859
860 /* Structure of data from 7715 device:
861 * Byte 1: IIR serial Port
862 * Byte 2: unused
863 * Byte 2: DSR parallel port
864 * Byte 4: FIFO status for both */
865
866 if (unlikely(length != 4)) {
867 dbg("Wrong data !!!");
868 return;
869 }
870
871 iir = data[0];
872 if (!(iir & 0x01)) { /* serial port interrupt pending */
873 switch (iir & 0x0f) {
874 case SERIAL_IIR_RLS:
875 dbg("Serial Port: Receiver status error or address "
876 "bit detected in 9-bit mode\n");
877 break;
878 case SERIAL_IIR_CTI:
879 dbg("Serial Port: Receiver time out");
880 break;
881 case SERIAL_IIR_MS:
882 /* dbg("Serial Port: Modem status change"); */
883 break;
884 }
885 }
886
887#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
888 { /* update local copy of DSR reg */
889 struct usb_serial_port *port = urb->context;
890 struct mos7715_parport *mos_parport = port->serial->private;
891 if (unlikely(mos_parport == NULL))
892 return;
893 atomic_set(&mos_parport->shadowDSR, data[2]);
894 }
895#endif
896
897exit:
898 result = usb_submit_urb(urb, GFP_ATOMIC);
899 if (result)
900 dev_err(&urb->dev->dev,
901 "%s - Error %d submitting control urb\n",
902 __func__, result);
903}
904
905/*
906 * mos7720_bulk_in_callback
907 * this is the callback function for when we have received data on the
908 * bulk in endpoint.
909 */
910static void mos7720_bulk_in_callback(struct urb *urb)
911{
912 int retval;
913 unsigned char *data ;
914 struct usb_serial_port *port;
915 struct tty_struct *tty;
916 int status = urb->status;
917
918 if (status) {
919 dbg("nonzero read bulk status received: %d", status);
920 return;
921 }
922
923 port = urb->context;
924
925 dbg("Entering...%s", __func__);
926
927 data = urb->transfer_buffer;
928
929 tty = tty_port_tty_get(&port->port);
930 if (tty && urb->actual_length) {
931 tty_insert_flip_string(tty, data, urb->actual_length);
932 tty_flip_buffer_push(tty);
933 }
934 tty_kref_put(tty);
935
936 if (port->read_urb->status != -EINPROGRESS) {
937 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
938 if (retval)
939 dbg("usb_submit_urb(read bulk) failed, retval = %d",
940 retval);
941 }
942}
943
944/*
945 * mos7720_bulk_out_data_callback
946 * this is the callback function for when we have finished sending serial
947 * data on the bulk out endpoint.
948 */
949static void mos7720_bulk_out_data_callback(struct urb *urb)
950{
951 struct moschip_port *mos7720_port;
952 struct tty_struct *tty;
953 int status = urb->status;
954
955 if (status) {
956 dbg("nonzero write bulk status received:%d", status);
957 return;
958 }
959
960 mos7720_port = urb->context;
961 if (!mos7720_port) {
962 dbg("NULL mos7720_port pointer");
963 return ;
964 }
965
966 tty = tty_port_tty_get(&mos7720_port->port->port);
967
968 if (tty && mos7720_port->open)
969 tty_wakeup(tty);
970 tty_kref_put(tty);
971}
972
973/*
974 * mos77xx_probe
975 * this function installs the appropriate read interrupt endpoint callback
976 * depending on whether the device is a 7720 or 7715, thus avoiding costly
977 * run-time checks in the high-frequency callback routine itself.
978 */
979static int mos77xx_probe(struct usb_serial *serial,
980 const struct usb_device_id *id)
981{
982 if (id->idProduct == MOSCHIP_DEVICE_ID_7715)
983 moschip7720_2port_driver.read_int_callback =
984 mos7715_interrupt_callback;
985 else
986 moschip7720_2port_driver.read_int_callback =
987 mos7720_interrupt_callback;
988
989 return 0;
990}
991
992static int mos77xx_calc_num_ports(struct usb_serial *serial)
993{
994 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
995 if (product == MOSCHIP_DEVICE_ID_7715)
996 return 1;
997
998 return 2;
999}
1000
1001static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port)
1002{
1003 struct usb_serial *serial;
1004 struct urb *urb;
1005 struct moschip_port *mos7720_port;
1006 int response;
1007 int port_number;
1008 __u8 data;
1009 int allocated_urbs = 0;
1010 int j;
1011
1012 serial = port->serial;
1013
1014 mos7720_port = usb_get_serial_port_data(port);
1015 if (mos7720_port == NULL)
1016 return -ENODEV;
1017
1018 usb_clear_halt(serial->dev, port->write_urb->pipe);
1019 usb_clear_halt(serial->dev, port->read_urb->pipe);
1020
1021 /* Initialising the write urb pool */
1022 for (j = 0; j < NUM_URBS; ++j) {
1023 urb = usb_alloc_urb(0, GFP_KERNEL);
1024 mos7720_port->write_urb_pool[j] = urb;
1025
1026 if (urb == NULL) {
1027 dev_err(&port->dev, "No more urbs???\n");
1028 continue;
1029 }
1030
1031 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1032 GFP_KERNEL);
1033 if (!urb->transfer_buffer) {
1034 dev_err(&port->dev,
1035 "%s-out of memory for urb buffers.\n",
1036 __func__);
1037 usb_free_urb(mos7720_port->write_urb_pool[j]);
1038 mos7720_port->write_urb_pool[j] = NULL;
1039 continue;
1040 }
1041 allocated_urbs++;
1042 }
1043
1044 if (!allocated_urbs)
1045 return -ENOMEM;
1046
1047 /* Initialize MCS7720 -- Write Init values to corresponding Registers
1048 *
1049 * Register Index
1050 * 0 : THR/RHR
1051 * 1 : IER
1052 * 2 : FCR
1053 * 3 : LCR
1054 * 4 : MCR
1055 * 5 : LSR
1056 * 6 : MSR
1057 * 7 : SPR
1058 *
1059 * 0x08 : SP1/2 Control Reg
1060 */
1061 port_number = port->number - port->serial->minor;
1062 read_mos_reg(serial, port_number, LSR, &data);
1063
1064 dbg("SS::%p LSR:%x", mos7720_port, data);
1065
1066 dbg("Check:Sending Command ..........");
1067
1068 write_mos_reg(serial, dummy, SP1_REG, 0x02);
1069 write_mos_reg(serial, dummy, SP2_REG, 0x02);
1070
1071 write_mos_reg(serial, port_number, IER, 0x00);
1072 write_mos_reg(serial, port_number, FCR, 0x00);
1073
1074 write_mos_reg(serial, port_number, FCR, 0xcf);
1075 mos7720_port->shadowLCR = 0x03;
1076 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1077 mos7720_port->shadowMCR = 0x0b;
1078 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1079
1080 write_mos_reg(serial, port_number, SP_CONTROL_REG, 0x00);
1081 read_mos_reg(serial, dummy, SP_CONTROL_REG, &data);
1082 data = data | (port->number - port->serial->minor + 1);
1083 write_mos_reg(serial, dummy, SP_CONTROL_REG, data);
1084 mos7720_port->shadowLCR = 0x83;
1085 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1086 write_mos_reg(serial, port_number, THR, 0x0c);
1087 write_mos_reg(serial, port_number, IER, 0x00);
1088 mos7720_port->shadowLCR = 0x03;
1089 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1090 write_mos_reg(serial, port_number, IER, 0x0c);
1091
1092 response = usb_submit_urb(port->read_urb, GFP_KERNEL);
1093 if (response)
1094 dev_err(&port->dev, "%s - Error %d submitting read urb\n",
1095 __func__, response);
1096
1097 /* initialize our icount structure */
1098 memset(&(mos7720_port->icount), 0x00, sizeof(mos7720_port->icount));
1099
1100 /* initialize our port settings */
1101 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */
1102
1103 /* send a open port command */
1104 mos7720_port->open = 1;
1105
1106 return 0;
1107}
1108
1109/*
1110 * mos7720_chars_in_buffer
1111 * this function is called by the tty driver when it wants to know how many
1112 * bytes of data we currently have outstanding in the port (data that has
1113 * been written, but hasn't made it out the port yet)
1114 * If successful, we return the number of bytes left to be written in the
1115 * system,
1116 * Otherwise we return a negative error number.
1117 */
1118static int mos7720_chars_in_buffer(struct tty_struct *tty)
1119{
1120 struct usb_serial_port *port = tty->driver_data;
1121 int i;
1122 int chars = 0;
1123 struct moschip_port *mos7720_port;
1124
1125 dbg("%s:entering ...........", __func__);
1126
1127 mos7720_port = usb_get_serial_port_data(port);
1128 if (mos7720_port == NULL) {
1129 dbg("%s:leaving ...........", __func__);
1130 return 0;
1131 }
1132
1133 for (i = 0; i < NUM_URBS; ++i) {
1134 if (mos7720_port->write_urb_pool[i] &&
1135 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS)
1136 chars += URB_TRANSFER_BUFFER_SIZE;
1137 }
1138 dbg("%s - returns %d", __func__, chars);
1139 return chars;
1140}
1141
1142static void mos7720_close(struct usb_serial_port *port)
1143{
1144 struct usb_serial *serial;
1145 struct moschip_port *mos7720_port;
1146 int j;
1147
1148 dbg("mos7720_close:entering...");
1149
1150 serial = port->serial;
1151
1152 mos7720_port = usb_get_serial_port_data(port);
1153 if (mos7720_port == NULL)
1154 return;
1155
1156 for (j = 0; j < NUM_URBS; ++j)
1157 usb_kill_urb(mos7720_port->write_urb_pool[j]);
1158
1159 /* Freeing Write URBs */
1160 for (j = 0; j < NUM_URBS; ++j) {
1161 if (mos7720_port->write_urb_pool[j]) {
1162 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer);
1163 usb_free_urb(mos7720_port->write_urb_pool[j]);
1164 }
1165 }
1166
1167 /* While closing port, shutdown all bulk read, write *
1168 * and interrupt read if they exists, otherwise nop */
1169 dbg("Shutdown bulk write");
1170 usb_kill_urb(port->write_urb);
1171 dbg("Shutdown bulk read");
1172 usb_kill_urb(port->read_urb);
1173
1174 mutex_lock(&serial->disc_mutex);
1175 /* these commands must not be issued if the device has
1176 * been disconnected */
1177 if (!serial->disconnected) {
1178 write_mos_reg(serial, port->number - port->serial->minor,
1179 MCR, 0x00);
1180 write_mos_reg(serial, port->number - port->serial->minor,
1181 IER, 0x00);
1182 }
1183 mutex_unlock(&serial->disc_mutex);
1184 mos7720_port->open = 0;
1185
1186 dbg("Leaving %s", __func__);
1187}
1188
1189static void mos7720_break(struct tty_struct *tty, int break_state)
1190{
1191 struct usb_serial_port *port = tty->driver_data;
1192 unsigned char data;
1193 struct usb_serial *serial;
1194 struct moschip_port *mos7720_port;
1195
1196 dbg("Entering %s", __func__);
1197
1198 serial = port->serial;
1199
1200 mos7720_port = usb_get_serial_port_data(port);
1201 if (mos7720_port == NULL)
1202 return;
1203
1204 if (break_state == -1)
1205 data = mos7720_port->shadowLCR | UART_LCR_SBC;
1206 else
1207 data = mos7720_port->shadowLCR & ~UART_LCR_SBC;
1208
1209 mos7720_port->shadowLCR = data;
1210 write_mos_reg(serial, port->number - port->serial->minor,
1211 LCR, mos7720_port->shadowLCR);
1212}
1213
1214/*
1215 * mos7720_write_room
1216 * this function is called by the tty driver when it wants to know how many
1217 * bytes of data we can accept for a specific port.
1218 * If successful, we return the amount of room that we have for this port
1219 * Otherwise we return a negative error number.
1220 */
1221static int mos7720_write_room(struct tty_struct *tty)
1222{
1223 struct usb_serial_port *port = tty->driver_data;
1224 struct moschip_port *mos7720_port;
1225 int room = 0;
1226 int i;
1227
1228 dbg("%s:entering ...........", __func__);
1229
1230 mos7720_port = usb_get_serial_port_data(port);
1231 if (mos7720_port == NULL) {
1232 dbg("%s:leaving ...........", __func__);
1233 return -ENODEV;
1234 }
1235
1236 /* FIXME: Locking */
1237 for (i = 0; i < NUM_URBS; ++i) {
1238 if (mos7720_port->write_urb_pool[i] &&
1239 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS)
1240 room += URB_TRANSFER_BUFFER_SIZE;
1241 }
1242
1243 dbg("%s - returns %d", __func__, room);
1244 return room;
1245}
1246
1247static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port,
1248 const unsigned char *data, int count)
1249{
1250 int status;
1251 int i;
1252 int bytes_sent = 0;
1253 int transfer_size;
1254
1255 struct moschip_port *mos7720_port;
1256 struct usb_serial *serial;
1257 struct urb *urb;
1258 const unsigned char *current_position = data;
1259
1260 dbg("%s:entering ...........", __func__);
1261
1262 serial = port->serial;
1263
1264 mos7720_port = usb_get_serial_port_data(port);
1265 if (mos7720_port == NULL) {
1266 dbg("mos7720_port is NULL");
1267 return -ENODEV;
1268 }
1269
1270 /* try to find a free urb in the list */
1271 urb = NULL;
1272
1273 for (i = 0; i < NUM_URBS; ++i) {
1274 if (mos7720_port->write_urb_pool[i] &&
1275 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) {
1276 urb = mos7720_port->write_urb_pool[i];
1277 dbg("URB:%d", i);
1278 break;
1279 }
1280 }
1281
1282 if (urb == NULL) {
1283 dbg("%s - no more free urbs", __func__);
1284 goto exit;
1285 }
1286
1287 if (urb->transfer_buffer == NULL) {
1288 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1289 GFP_KERNEL);
1290 if (urb->transfer_buffer == NULL) {
1291 dev_err_console(port, "%s no more kernel memory...\n",
1292 __func__);
1293 goto exit;
1294 }
1295 }
1296 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1297
1298 memcpy(urb->transfer_buffer, current_position, transfer_size);
1299 usb_serial_debug_data(debug, &port->dev, __func__, transfer_size,
1300 urb->transfer_buffer);
1301
1302 /* fill urb with data and submit */
1303 usb_fill_bulk_urb(urb, serial->dev,
1304 usb_sndbulkpipe(serial->dev,
1305 port->bulk_out_endpointAddress),
1306 urb->transfer_buffer, transfer_size,
1307 mos7720_bulk_out_data_callback, mos7720_port);
1308
1309 /* send it down the pipe */
1310 status = usb_submit_urb(urb, GFP_ATOMIC);
1311 if (status) {
1312 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1313 "with status = %d\n", __func__, status);
1314 bytes_sent = status;
1315 goto exit;
1316 }
1317 bytes_sent = transfer_size;
1318
1319exit:
1320 return bytes_sent;
1321}
1322
1323static void mos7720_throttle(struct tty_struct *tty)
1324{
1325 struct usb_serial_port *port = tty->driver_data;
1326 struct moschip_port *mos7720_port;
1327 int status;
1328
1329 dbg("%s- port %d", __func__, port->number);
1330
1331 mos7720_port = usb_get_serial_port_data(port);
1332
1333 if (mos7720_port == NULL)
1334 return;
1335
1336 if (!mos7720_port->open) {
1337 dbg("port not opened");
1338 return;
1339 }
1340
1341 dbg("%s: Entering ..........", __func__);
1342
1343 /* if we are implementing XON/XOFF, send the stop character */
1344 if (I_IXOFF(tty)) {
1345 unsigned char stop_char = STOP_CHAR(tty);
1346 status = mos7720_write(tty, port, &stop_char, 1);
1347 if (status <= 0)
1348 return;
1349 }
1350
1351 /* if we are implementing RTS/CTS, toggle that line */
1352 if (tty->termios->c_cflag & CRTSCTS) {
1353 mos7720_port->shadowMCR &= ~UART_MCR_RTS;
1354 write_mos_reg(port->serial, port->number - port->serial->minor,
1355 MCR, mos7720_port->shadowMCR);
1356 if (status != 0)
1357 return;
1358 }
1359}
1360
1361static void mos7720_unthrottle(struct tty_struct *tty)
1362{
1363 struct usb_serial_port *port = tty->driver_data;
1364 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1365 int status;
1366
1367 if (mos7720_port == NULL)
1368 return;
1369
1370 if (!mos7720_port->open) {
1371 dbg("%s - port not opened", __func__);
1372 return;
1373 }
1374
1375 dbg("%s: Entering ..........", __func__);
1376
1377 /* if we are implementing XON/XOFF, send the start character */
1378 if (I_IXOFF(tty)) {
1379 unsigned char start_char = START_CHAR(tty);
1380 status = mos7720_write(tty, port, &start_char, 1);
1381 if (status <= 0)
1382 return;
1383 }
1384
1385 /* if we are implementing RTS/CTS, toggle that line */
1386 if (tty->termios->c_cflag & CRTSCTS) {
1387 mos7720_port->shadowMCR |= UART_MCR_RTS;
1388 write_mos_reg(port->serial, port->number - port->serial->minor,
1389 MCR, mos7720_port->shadowMCR);
1390 if (status != 0)
1391 return;
1392 }
1393}
1394
1395/* FIXME: this function does not work */
1396static int set_higher_rates(struct moschip_port *mos7720_port,
1397 unsigned int baud)
1398{
1399 struct usb_serial_port *port;
1400 struct usb_serial *serial;
1401 int port_number;
1402 enum mos_regs sp_reg;
1403 if (mos7720_port == NULL)
1404 return -EINVAL;
1405
1406 port = mos7720_port->port;
1407 serial = port->serial;
1408
1409 /***********************************************
1410 * Init Sequence for higher rates
1411 ***********************************************/
1412 dbg("Sending Setting Commands ..........");
1413 port_number = port->number - port->serial->minor;
1414
1415 write_mos_reg(serial, port_number, IER, 0x00);
1416 write_mos_reg(serial, port_number, FCR, 0x00);
1417 write_mos_reg(serial, port_number, FCR, 0xcf);
1418 mos7720_port->shadowMCR = 0x0b;
1419 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1420 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x00);
1421
1422 /***********************************************
1423 * Set for higher rates *
1424 ***********************************************/
1425 /* writing baud rate verbatum into uart clock field clearly not right */
1426 if (port_number == 0)
1427 sp_reg = SP1_REG;
1428 else
1429 sp_reg = SP2_REG;
1430 write_mos_reg(serial, dummy, sp_reg, baud * 0x10);
1431 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x03);
1432 mos7720_port->shadowMCR = 0x2b;
1433 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1434
1435 /***********************************************
1436 * Set DLL/DLM
1437 ***********************************************/
1438 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1439 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1440 write_mos_reg(serial, port_number, DLL, 0x01);
1441 write_mos_reg(serial, port_number, DLM, 0x00);
1442 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1443 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1444
1445 return 0;
1446}
1447
1448/* baud rate information */
1449struct divisor_table_entry {
1450 __u32 baudrate;
1451 __u16 divisor;
1452};
1453
1454/* Define table of divisors for moschip 7720 hardware *
1455 * These assume a 3.6864MHz crystal, the standard /16, and *
1456 * MCR.7 = 0. */
1457static struct divisor_table_entry divisor_table[] = {
1458 { 50, 2304},
1459 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */
1460 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */
1461 { 150, 768},
1462 { 300, 384},
1463 { 600, 192},
1464 { 1200, 96},
1465 { 1800, 64},
1466 { 2400, 48},
1467 { 4800, 24},
1468 { 7200, 16},
1469 { 9600, 12},
1470 { 19200, 6},
1471 { 38400, 3},
1472 { 57600, 2},
1473 { 115200, 1},
1474};
1475
1476/*****************************************************************************
1477 * calc_baud_rate_divisor
1478 * this function calculates the proper baud rate divisor for the specified
1479 * baud rate.
1480 *****************************************************************************/
1481static int calc_baud_rate_divisor(int baudrate, int *divisor)
1482{
1483 int i;
1484 __u16 custom;
1485 __u16 round1;
1486 __u16 round;
1487
1488
1489 dbg("%s - %d", __func__, baudrate);
1490
1491 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) {
1492 if (divisor_table[i].baudrate == baudrate) {
1493 *divisor = divisor_table[i].divisor;
1494 return 0;
1495 }
1496 }
1497
1498 /* After trying for all the standard baud rates *
1499 * Try calculating the divisor for this baud rate */
1500 if (baudrate > 75 && baudrate < 230400) {
1501 /* get the divisor */
1502 custom = (__u16)(230400L / baudrate);
1503
1504 /* Check for round off */
1505 round1 = (__u16)(2304000L / baudrate);
1506 round = (__u16)(round1 - (custom * 10));
1507 if (round > 4)
1508 custom++;
1509 *divisor = custom;
1510
1511 dbg("Baud %d = %d", baudrate, custom);
1512 return 0;
1513 }
1514
1515 dbg("Baud calculation Failed...");
1516 return -EINVAL;
1517}
1518
1519/*
1520 * send_cmd_write_baud_rate
1521 * this function sends the proper command to change the baud rate of the
1522 * specified port.
1523 */
1524static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port,
1525 int baudrate)
1526{
1527 struct usb_serial_port *port;
1528 struct usb_serial *serial;
1529 int divisor;
1530 int status;
1531 unsigned char number;
1532
1533 if (mos7720_port == NULL)
1534 return -1;
1535
1536 port = mos7720_port->port;
1537 serial = port->serial;
1538
1539 dbg("%s: Entering ..........", __func__);
1540
1541 number = port->number - port->serial->minor;
1542 dbg("%s - port = %d, baud = %d", __func__, port->number, baudrate);
1543
1544 /* Calculate the Divisor */
1545 status = calc_baud_rate_divisor(baudrate, &divisor);
1546 if (status) {
1547 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1548 return status;
1549 }
1550
1551 /* Enable access to divisor latch */
1552 mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
1553 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR);
1554
1555 /* Write the divisor */
1556 write_mos_reg(serial, number, DLL, (__u8)(divisor & 0xff));
1557 write_mos_reg(serial, number, DLM, (__u8)((divisor & 0xff00) >> 8));
1558
1559 /* Disable access to divisor latch */
1560 mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1561 write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR);
1562
1563 return status;
1564}
1565
1566/*
1567 * change_port_settings
1568 * This routine is called to set the UART on the device to match
1569 * the specified new settings.
1570 */
1571static void change_port_settings(struct tty_struct *tty,
1572 struct moschip_port *mos7720_port,
1573 struct ktermios *old_termios)
1574{
1575 struct usb_serial_port *port;
1576 struct usb_serial *serial;
1577 int baud;
1578 unsigned cflag;
1579 unsigned iflag;
1580 __u8 mask = 0xff;
1581 __u8 lData;
1582 __u8 lParity;
1583 __u8 lStop;
1584 int status;
1585 int port_number;
1586
1587 if (mos7720_port == NULL)
1588 return ;
1589
1590 port = mos7720_port->port;
1591 serial = port->serial;
1592 port_number = port->number - port->serial->minor;
1593
1594 dbg("%s - port %d", __func__, port->number);
1595
1596 if (!mos7720_port->open) {
1597 dbg("%s - port not opened", __func__);
1598 return;
1599 }
1600
1601 dbg("%s: Entering ..........", __func__);
1602
1603 lData = UART_LCR_WLEN8;
1604 lStop = 0x00; /* 1 stop bit */
1605 lParity = 0x00; /* No parity */
1606
1607 cflag = tty->termios->c_cflag;
1608 iflag = tty->termios->c_iflag;
1609
1610 /* Change the number of bits */
1611 switch (cflag & CSIZE) {
1612 case CS5:
1613 lData = UART_LCR_WLEN5;
1614 mask = 0x1f;
1615 break;
1616
1617 case CS6:
1618 lData = UART_LCR_WLEN6;
1619 mask = 0x3f;
1620 break;
1621
1622 case CS7:
1623 lData = UART_LCR_WLEN7;
1624 mask = 0x7f;
1625 break;
1626 default:
1627 case CS8:
1628 lData = UART_LCR_WLEN8;
1629 break;
1630 }
1631
1632 /* Change the Parity bit */
1633 if (cflag & PARENB) {
1634 if (cflag & PARODD) {
1635 lParity = UART_LCR_PARITY;
1636 dbg("%s - parity = odd", __func__);
1637 } else {
1638 lParity = (UART_LCR_EPAR | UART_LCR_PARITY);
1639 dbg("%s - parity = even", __func__);
1640 }
1641
1642 } else {
1643 dbg("%s - parity = none", __func__);
1644 }
1645
1646 if (cflag & CMSPAR)
1647 lParity = lParity | 0x20;
1648
1649 /* Change the Stop bit */
1650 if (cflag & CSTOPB) {
1651 lStop = UART_LCR_STOP;
1652 dbg("%s - stop bits = 2", __func__);
1653 } else {
1654 lStop = 0x00;
1655 dbg("%s - stop bits = 1", __func__);
1656 }
1657
1658#define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
1659#define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
1660#define LCR_PAR_MASK 0x38 /* Mask for parity field */
1661
1662 /* Update the LCR with the correct value */
1663 mos7720_port->shadowLCR &=
1664 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1665 mos7720_port->shadowLCR |= (lData | lParity | lStop);
1666
1667
1668 /* Disable Interrupts */
1669 write_mos_reg(serial, port_number, IER, 0x00);
1670 write_mos_reg(serial, port_number, FCR, 0x00);
1671 write_mos_reg(serial, port_number, FCR, 0xcf);
1672
1673 /* Send the updated LCR value to the mos7720 */
1674 write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
1675 mos7720_port->shadowMCR = 0x0b;
1676 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1677
1678 /* set up the MCR register and send it to the mos7720 */
1679 mos7720_port->shadowMCR = UART_MCR_OUT2;
1680 if (cflag & CBAUD)
1681 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS);
1682
1683 if (cflag & CRTSCTS) {
1684 mos7720_port->shadowMCR |= (UART_MCR_XONANY);
1685 /* To set hardware flow control to the specified *
1686 * serial port, in SP1/2_CONTROL_REG */
1687 if (port->number)
1688 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x01);
1689 else
1690 write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x02);
1691
1692 } else
1693 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY);
1694
1695 write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
1696
1697 /* Determine divisor based on baud rate */
1698 baud = tty_get_baud_rate(tty);
1699 if (!baud) {
1700 /* pick a default, any default... */
1701 dbg("Picked default baud...");
1702 baud = 9600;
1703 }
1704
1705 if (baud >= 230400) {
1706 set_higher_rates(mos7720_port, baud);
1707 /* Enable Interrupts */
1708 write_mos_reg(serial, port_number, IER, 0x0c);
1709 return;
1710 }
1711
1712 dbg("%s - baud rate = %d", __func__, baud);
1713 status = send_cmd_write_baud_rate(mos7720_port, baud);
1714 /* FIXME: needs to write actual resulting baud back not just
1715 blindly do so */
1716 if (cflag & CBAUD)
1717 tty_encode_baud_rate(tty, baud, baud);
1718 /* Enable Interrupts */
1719 write_mos_reg(serial, port_number, IER, 0x0c);
1720
1721 if (port->read_urb->status != -EINPROGRESS) {
1722 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1723 if (status)
1724 dbg("usb_submit_urb(read bulk) failed, status = %d",
1725 status);
1726 }
1727}
1728
1729/*
1730 * mos7720_set_termios
1731 * this function is called by the tty driver when it wants to change the
1732 * termios structure.
1733 */
1734static void mos7720_set_termios(struct tty_struct *tty,
1735 struct usb_serial_port *port, struct ktermios *old_termios)
1736{
1737 int status;
1738 unsigned int cflag;
1739 struct usb_serial *serial;
1740 struct moschip_port *mos7720_port;
1741
1742 serial = port->serial;
1743
1744 mos7720_port = usb_get_serial_port_data(port);
1745
1746 if (mos7720_port == NULL)
1747 return;
1748
1749 if (!mos7720_port->open) {
1750 dbg("%s - port not opened", __func__);
1751 return;
1752 }
1753
1754 dbg("%s\n", "setting termios - ASPIRE");
1755
1756 cflag = tty->termios->c_cflag;
1757
1758 dbg("%s - cflag %08x iflag %08x", __func__,
1759 tty->termios->c_cflag,
1760 RELEVANT_IFLAG(tty->termios->c_iflag));
1761
1762 dbg("%s - old cflag %08x old iflag %08x", __func__,
1763 old_termios->c_cflag,
1764 RELEVANT_IFLAG(old_termios->c_iflag));
1765
1766 dbg("%s - port %d", __func__, port->number);
1767
1768 /* change the port settings to the new ones specified */
1769 change_port_settings(tty, mos7720_port, old_termios);
1770
1771 if (port->read_urb->status != -EINPROGRESS) {
1772 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1773 if (status)
1774 dbg("usb_submit_urb(read bulk) failed, status = %d",
1775 status);
1776 }
1777}
1778
1779/*
1780 * get_lsr_info - get line status register info
1781 *
1782 * Purpose: Let user call ioctl() to get info when the UART physically
1783 * is emptied. On bus types like RS485, the transmitter must
1784 * release the bus after transmitting. This must be done when
1785 * the transmit shift register is empty, not be done when the
1786 * transmit holding register is empty. This functionality
1787 * allows an RS485 driver to be written in user space.
1788 */
1789static int get_lsr_info(struct tty_struct *tty,
1790 struct moschip_port *mos7720_port, unsigned int __user *value)
1791{
1792 struct usb_serial_port *port = tty->driver_data;
1793 unsigned int result = 0;
1794 unsigned char data = 0;
1795 int port_number = port->number - port->serial->minor;
1796 int count;
1797
1798 count = mos7720_chars_in_buffer(tty);
1799 if (count == 0) {
1800 read_mos_reg(port->serial, port_number, LSR, &data);
1801 if ((data & (UART_LSR_TEMT | UART_LSR_THRE))
1802 == (UART_LSR_TEMT | UART_LSR_THRE)) {
1803 dbg("%s -- Empty", __func__);
1804 result = TIOCSER_TEMT;
1805 }
1806 }
1807 if (copy_to_user(value, &result, sizeof(int)))
1808 return -EFAULT;
1809 return 0;
1810}
1811
1812static int mos7720_tiocmget(struct tty_struct *tty)
1813{
1814 struct usb_serial_port *port = tty->driver_data;
1815 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1816 unsigned int result = 0;
1817 unsigned int mcr ;
1818 unsigned int msr ;
1819
1820 dbg("%s - port %d", __func__, port->number);
1821
1822 mcr = mos7720_port->shadowMCR;
1823 msr = mos7720_port->shadowMSR;
1824
1825 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */
1826 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */
1827 | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */
1828 | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */
1829 | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */
1830 | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
1831
1832 dbg("%s -- %x", __func__, result);
1833
1834 return result;
1835}
1836
1837static int mos7720_tiocmset(struct tty_struct *tty,
1838 unsigned int set, unsigned int clear)
1839{
1840 struct usb_serial_port *port = tty->driver_data;
1841 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
1842 unsigned int mcr ;
1843 dbg("%s - port %d", __func__, port->number);
1844 dbg("he was at tiocmset");
1845
1846 mcr = mos7720_port->shadowMCR;
1847
1848 if (set & TIOCM_RTS)
1849 mcr |= UART_MCR_RTS;
1850 if (set & TIOCM_DTR)
1851 mcr |= UART_MCR_DTR;
1852 if (set & TIOCM_LOOP)
1853 mcr |= UART_MCR_LOOP;
1854
1855 if (clear & TIOCM_RTS)
1856 mcr &= ~UART_MCR_RTS;
1857 if (clear & TIOCM_DTR)
1858 mcr &= ~UART_MCR_DTR;
1859 if (clear & TIOCM_LOOP)
1860 mcr &= ~UART_MCR_LOOP;
1861
1862 mos7720_port->shadowMCR = mcr;
1863 write_mos_reg(port->serial, port->number - port->serial->minor,
1864 MCR, mos7720_port->shadowMCR);
1865
1866 return 0;
1867}
1868
1869static int mos7720_get_icount(struct tty_struct *tty,
1870 struct serial_icounter_struct *icount)
1871{
1872 struct usb_serial_port *port = tty->driver_data;
1873 struct moschip_port *mos7720_port;
1874 struct async_icount cnow;
1875
1876 mos7720_port = usb_get_serial_port_data(port);
1877 cnow = mos7720_port->icount;
1878
1879 icount->cts = cnow.cts;
1880 icount->dsr = cnow.dsr;
1881 icount->rng = cnow.rng;
1882 icount->dcd = cnow.dcd;
1883 icount->rx = cnow.rx;
1884 icount->tx = cnow.tx;
1885 icount->frame = cnow.frame;
1886 icount->overrun = cnow.overrun;
1887 icount->parity = cnow.parity;
1888 icount->brk = cnow.brk;
1889 icount->buf_overrun = cnow.buf_overrun;
1890
1891 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
1892 port->number, icount->rx, icount->tx);
1893 return 0;
1894}
1895
1896static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd,
1897 unsigned int __user *value)
1898{
1899 unsigned int mcr;
1900 unsigned int arg;
1901
1902 struct usb_serial_port *port;
1903
1904 if (mos7720_port == NULL)
1905 return -1;
1906
1907 port = (struct usb_serial_port *)mos7720_port->port;
1908 mcr = mos7720_port->shadowMCR;
1909
1910 if (copy_from_user(&arg, value, sizeof(int)))
1911 return -EFAULT;
1912
1913 switch (cmd) {
1914 case TIOCMBIS:
1915 if (arg & TIOCM_RTS)
1916 mcr |= UART_MCR_RTS;
1917 if (arg & TIOCM_DTR)
1918 mcr |= UART_MCR_RTS;
1919 if (arg & TIOCM_LOOP)
1920 mcr |= UART_MCR_LOOP;
1921 break;
1922
1923 case TIOCMBIC:
1924 if (arg & TIOCM_RTS)
1925 mcr &= ~UART_MCR_RTS;
1926 if (arg & TIOCM_DTR)
1927 mcr &= ~UART_MCR_RTS;
1928 if (arg & TIOCM_LOOP)
1929 mcr &= ~UART_MCR_LOOP;
1930 break;
1931
1932 }
1933
1934 mos7720_port->shadowMCR = mcr;
1935 write_mos_reg(port->serial, port->number - port->serial->minor,
1936 MCR, mos7720_port->shadowMCR);
1937
1938 return 0;
1939}
1940
1941static int get_serial_info(struct moschip_port *mos7720_port,
1942 struct serial_struct __user *retinfo)
1943{
1944 struct serial_struct tmp;
1945
1946 if (!retinfo)
1947 return -EFAULT;
1948
1949 memset(&tmp, 0, sizeof(tmp));
1950
1951 tmp.type = PORT_16550A;
1952 tmp.line = mos7720_port->port->serial->minor;
1953 tmp.port = mos7720_port->port->number;
1954 tmp.irq = 0;
1955 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
1956 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1957 tmp.baud_base = 9600;
1958 tmp.close_delay = 5*HZ;
1959 tmp.closing_wait = 30*HZ;
1960
1961 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1962 return -EFAULT;
1963 return 0;
1964}
1965
1966static int mos7720_ioctl(struct tty_struct *tty,
1967 unsigned int cmd, unsigned long arg)
1968{
1969 struct usb_serial_port *port = tty->driver_data;
1970 struct moschip_port *mos7720_port;
1971 struct async_icount cnow;
1972 struct async_icount cprev;
1973
1974 mos7720_port = usb_get_serial_port_data(port);
1975 if (mos7720_port == NULL)
1976 return -ENODEV;
1977
1978 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
1979
1980 switch (cmd) {
1981 case TIOCSERGETLSR:
1982 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
1983 return get_lsr_info(tty, mos7720_port,
1984 (unsigned int __user *)arg);
1985
1986 /* FIXME: These should be using the mode methods */
1987 case TIOCMBIS:
1988 case TIOCMBIC:
1989 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET",
1990 __func__, port->number);
1991 return set_modem_info(mos7720_port, cmd,
1992 (unsigned int __user *)arg);
1993
1994 case TIOCGSERIAL:
1995 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
1996 return get_serial_info(mos7720_port,
1997 (struct serial_struct __user *)arg);
1998
1999 case TIOCMIWAIT:
2000 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2001 cprev = mos7720_port->icount;
2002 while (1) {
2003 if (signal_pending(current))
2004 return -ERESTARTSYS;
2005 cnow = mos7720_port->icount;
2006 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2007 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2008 return -EIO; /* no change => error */
2009 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2010 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2011 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2012 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2013 return 0;
2014 }
2015 cprev = cnow;
2016 }
2017 /* NOTREACHED */
2018 break;
2019 }
2020
2021 return -ENOIOCTLCMD;
2022}
2023
2024static int mos7720_startup(struct usb_serial *serial)
2025{
2026 struct moschip_port *mos7720_port;
2027 struct usb_device *dev;
2028 int i;
2029 char data;
2030 u16 product;
2031 int ret_val;
2032
2033 dbg("%s: Entering ..........", __func__);
2034
2035 if (!serial) {
2036 dbg("Invalid Handler");
2037 return -ENODEV;
2038 }
2039
2040 product = le16_to_cpu(serial->dev->descriptor.idProduct);
2041 dev = serial->dev;
2042
2043 /*
2044 * The 7715 uses the first bulk in/out endpoint pair for the parallel
2045 * port, and the second for the serial port. Because the usbserial core
2046 * assumes both pairs are serial ports, we must engage in a bit of
2047 * subterfuge and swap the pointers for ports 0 and 1 in order to make
2048 * port 0 point to the serial port. However, both moschip devices use a
2049 * single interrupt-in endpoint for both ports (as mentioned a little
2050 * further down), and this endpoint was assigned to port 0. So after
2051 * the swap, we must copy the interrupt endpoint elements from port 1
2052 * (as newly assigned) to port 0, and null out port 1 pointers.
2053 */
2054 if (product == MOSCHIP_DEVICE_ID_7715) {
2055 struct usb_serial_port *tmp = serial->port[0];
2056 serial->port[0] = serial->port[1];
2057 serial->port[1] = tmp;
2058 serial->port[0]->interrupt_in_urb = tmp->interrupt_in_urb;
2059 serial->port[0]->interrupt_in_buffer = tmp->interrupt_in_buffer;
2060 serial->port[0]->interrupt_in_endpointAddress =
2061 tmp->interrupt_in_endpointAddress;
2062 serial->port[1]->interrupt_in_urb = NULL;
2063 serial->port[1]->interrupt_in_buffer = NULL;
2064 }
2065
2066
2067 /* set up serial port private structures */
2068 for (i = 0; i < serial->num_ports; ++i) {
2069 mos7720_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2070 if (mos7720_port == NULL) {
2071 dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2072 return -ENOMEM;
2073 }
2074
2075 /* Initialize all port interrupt end point to port 0 int
2076 * endpoint. Our device has only one interrupt endpoint
2077 * common to all ports */
2078 serial->port[i]->interrupt_in_endpointAddress =
2079 serial->port[0]->interrupt_in_endpointAddress;
2080
2081 mos7720_port->port = serial->port[i];
2082 usb_set_serial_port_data(serial->port[i], mos7720_port);
2083
2084 dbg("port number is %d", serial->port[i]->number);
2085 dbg("serial number is %d", serial->minor);
2086 }
2087
2088
2089 /* setting configuration feature to one */
2090 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2091 (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5*HZ);
2092
2093 /* start the interrupt urb */
2094 ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL);
2095 if (ret_val)
2096 dev_err(&dev->dev,
2097 "%s - Error %d submitting control urb\n",
2098 __func__, ret_val);
2099
2100#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
2101 if (product == MOSCHIP_DEVICE_ID_7715) {
2102 ret_val = mos7715_parport_init(serial);
2103 if (ret_val < 0)
2104 return ret_val;
2105 }
2106#endif
2107 /* LSR For Port 1 */
2108 read_mos_reg(serial, 0, LSR, &data);
2109 dbg("LSR:%x", data);
2110
2111 return 0;
2112}
2113
2114static void mos7720_release(struct usb_serial *serial)
2115{
2116 int i;
2117
2118#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
2119 /* close the parallel port */
2120
2121 if (le16_to_cpu(serial->dev->descriptor.idProduct)
2122 == MOSCHIP_DEVICE_ID_7715) {
2123 struct urbtracker *urbtrack;
2124 unsigned long flags;
2125 struct mos7715_parport *mos_parport =
2126 usb_get_serial_data(serial);
2127
2128 /* prevent NULL ptr dereference in port callbacks */
2129 spin_lock(&release_lock);
2130 mos_parport->pp->private_data = NULL;
2131 spin_unlock(&release_lock);
2132
2133 /* wait for synchronous usb calls to return */
2134 if (mos_parport->msg_pending)
2135 wait_for_completion_timeout(&mos_parport->syncmsg_compl,
2136 MOS_WDR_TIMEOUT);
2137
2138 parport_remove_port(mos_parport->pp);
2139 usb_set_serial_data(serial, NULL);
2140 mos_parport->serial = NULL;
2141
2142 /* if tasklet currently scheduled, wait for it to complete */
2143 tasklet_kill(&mos_parport->urb_tasklet);
2144
2145 /* unlink any urbs sent by the tasklet */
2146 spin_lock_irqsave(&mos_parport->listlock, flags);
2147 list_for_each_entry(urbtrack,
2148 &mos_parport->active_urbs,
2149 urblist_entry)
2150 usb_unlink_urb(urbtrack->urb);
2151 spin_unlock_irqrestore(&mos_parport->listlock, flags);
2152
2153 kref_put(&mos_parport->ref_count, destroy_mos_parport);
2154 }
2155#endif
2156 /* free private structure allocated for serial port */
2157 for (i = 0; i < serial->num_ports; ++i)
2158 kfree(usb_get_serial_port_data(serial->port[i]));
2159}
2160
2161static struct usb_serial_driver moschip7720_2port_driver = {
2162 .driver = {
2163 .owner = THIS_MODULE,
2164 .name = "moschip7720",
2165 },
2166 .description = "Moschip 2 port adapter",
2167 .id_table = id_table,
2168 .calc_num_ports = mos77xx_calc_num_ports,
2169 .open = mos7720_open,
2170 .close = mos7720_close,
2171 .throttle = mos7720_throttle,
2172 .unthrottle = mos7720_unthrottle,
2173 .probe = mos77xx_probe,
2174 .attach = mos7720_startup,
2175 .release = mos7720_release,
2176 .ioctl = mos7720_ioctl,
2177 .tiocmget = mos7720_tiocmget,
2178 .tiocmset = mos7720_tiocmset,
2179 .get_icount = mos7720_get_icount,
2180 .set_termios = mos7720_set_termios,
2181 .write = mos7720_write,
2182 .write_room = mos7720_write_room,
2183 .chars_in_buffer = mos7720_chars_in_buffer,
2184 .break_ctl = mos7720_break,
2185 .read_bulk_callback = mos7720_bulk_in_callback,
2186 .read_int_callback = NULL /* dynamically assigned in probe() */
2187};
2188
2189static struct usb_serial_driver * const serial_drivers[] = {
2190 &moschip7720_2port_driver, NULL
2191};
2192
2193module_usb_serial_driver(serial_drivers, id_table);
2194
2195MODULE_AUTHOR(DRIVER_AUTHOR);
2196MODULE_DESCRIPTION(DRIVER_DESC);
2197MODULE_LICENSE("GPL");
2198
2199module_param(debug, bool, S_IRUGO | S_IWUSR);
2200MODULE_PARM_DESC(debug, "Debug enabled or not");