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