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 */
56 struct 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
69 static 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 };
74 MODULE_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
82 enum 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
88 struct 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 */
101 static DEFINE_SPINLOCK(release_lock);
102
103 #endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
104
105 static const unsigned int dummy; /* for clarity in register access fns */
106
107 enum 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 */
get_reg_index(enum mos_regs reg)134 static 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 */
get_reg_value(enum mos_regs reg,unsigned int serial_portnum)165 static 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 */
write_mos_reg(struct usb_serial * serial,unsigned int serial_portnum,enum mos_regs reg,__u8 data)183 static 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 */
read_mos_reg(struct usb_serial * serial,unsigned int serial_portnum,enum mos_regs reg,__u8 * data)205 static 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
mos7715_change_mode(struct mos7715_parport * mos_parport,enum mos7715_pp_modes mode)242 static 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
destroy_mos_parport(struct kref * kref)251 static 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 */
parport_prologue(struct parport * pp)271 static 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 */
parport_epilogue(struct parport * pp)306 static 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
deferred_restore_writes(struct work_struct * work)314 static 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);
330 done:
331 mutex_unlock(&mos_parport->serial->disc_mutex);
332 }
333
parport_mos7715_write_data(struct parport * pp,unsigned char d)334 static 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
parport_mos7715_read_data(struct parport * pp)345 static 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
parport_mos7715_write_control(struct parport * pp,unsigned char d)357 static 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
parport_mos7715_read_control(struct parport * pp)370 static 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
parport_mos7715_frob_control(struct parport * pp,unsigned char mask,unsigned char val)386 static 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
parport_mos7715_read_status(struct parport * pp)405 static 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
parport_mos7715_enable_irq(struct parport * pp)421 static void parport_mos7715_enable_irq(struct parport *pp)
422 {
423 }
424
parport_mos7715_disable_irq(struct parport * pp)425 static void parport_mos7715_disable_irq(struct parport *pp)
426 {
427 }
428
parport_mos7715_data_forward(struct parport * pp)429 static 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
parport_mos7715_data_reverse(struct parport * pp)442 static 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
parport_mos7715_init_state(struct pardevice * dev,struct parport_state * s)455 static 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 */
parport_mos7715_save_state(struct parport * pp,struct parport_state * s)463 static 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 */
parport_mos7715_restore_state(struct parport * pp,struct parport_state * s)480 static 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
parport_mos7715_write_compat(struct parport * pp,const void * buffer,size_t len,int flags)498 static 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
522 static 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 */
mos7715_parport_init(struct usb_serial * serial)553 static 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 */
mos7720_interrupt_callback(struct urb * urb)605 static 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
679 exit:
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 */
mos7715_interrupt_callback(struct urb * urb)690 static 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
754 exit:
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 */
mos7720_bulk_in_callback(struct urb * urb)765 static 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 */
mos7720_bulk_out_data_callback(struct urb * urb)800 static 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
mos77xx_calc_num_ports(struct usb_serial * serial,struct usb_serial_endpoints * epds)820 static 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
mos7720_open(struct tty_struct * tty,struct usb_serial_port * port)842 static 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 */
mos7720_chars_in_buffer(struct tty_struct * tty)949 static 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
mos7720_close(struct usb_serial_port * port)965 static 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
mos7720_break(struct tty_struct * tty,int break_state)999 static 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 */
mos7720_write_room(struct tty_struct * tty)1028 static 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
mos7720_write(struct tty_struct * tty,struct usb_serial_port * port,const unsigned char * data,int count)1046 static 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
1113 exit:
1114 return bytes_sent;
1115 }
1116
mos7720_throttle(struct tty_struct * tty)1117 static 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
mos7720_unthrottle(struct tty_struct * tty)1149 static 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 */
set_higher_rates(struct moschip_port * mos7720_port,unsigned int baud)1180 static 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 */
1237 struct 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. */
1245 static 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 *****************************************************************************/
calc_baud_rate_divisor(struct usb_serial_port * port,int baudrate,int * divisor)1269 static 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 */
send_cmd_write_baud_rate(struct moschip_port * mos7720_port,int baudrate)1312 static 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 */
change_port_settings(struct tty_struct * tty,struct moschip_port * mos7720_port,const struct ktermios * old_termios)1358 static 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 */
mos7720_set_termios(struct tty_struct * tty,struct usb_serial_port * port,const struct ktermios * old_termios)1497 static 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 */
get_lsr_info(struct tty_struct * tty,struct moschip_port * mos7720_port,unsigned int __user * value)1534 static 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
mos7720_tiocmget(struct tty_struct * tty)1557 static 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
mos7720_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)1578 static 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
mos7720_ioctl(struct tty_struct * tty,unsigned int cmd,unsigned long arg)1608 static 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
mos7720_startup(struct usb_serial * serial)1628 static 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
mos7720_release(struct usb_serial * serial)1663 static 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
mos7720_port_probe(struct usb_serial_port * port)1702 static 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
mos7720_port_remove(struct usb_serial_port * port)1717 static 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
1725 static struct usb_serial_driver moschip7720_2port_driver = {
1726 .driver = {
1727 .owner = THIS_MODULE,
1728 .name = "moschip7720",
1729 },
1730 .description = "Moschip 2 port adapter",
1731 .id_table = id_table,
1732 .num_bulk_in = 2,
1733 .num_bulk_out = 2,
1734 .num_interrupt_in = 1,
1735 .calc_num_ports = mos77xx_calc_num_ports,
1736 .open = mos7720_open,
1737 .close = mos7720_close,
1738 .throttle = mos7720_throttle,
1739 .unthrottle = mos7720_unthrottle,
1740 .attach = mos7720_startup,
1741 .release = mos7720_release,
1742 .port_probe = mos7720_port_probe,
1743 .port_remove = mos7720_port_remove,
1744 .ioctl = mos7720_ioctl,
1745 .tiocmget = mos7720_tiocmget,
1746 .tiocmset = mos7720_tiocmset,
1747 .set_termios = mos7720_set_termios,
1748 .write = mos7720_write,
1749 .write_room = mos7720_write_room,
1750 .chars_in_buffer = mos7720_chars_in_buffer,
1751 .break_ctl = mos7720_break,
1752 .read_bulk_callback = mos7720_bulk_in_callback,
1753 .read_int_callback = mos7720_interrupt_callback,
1754 };
1755
1756 static struct usb_serial_driver * const serial_drivers[] = {
1757 &moschip7720_2port_driver, NULL
1758 };
1759
1760 module_usb_serial_driver(serial_drivers, id_table);
1761
1762 MODULE_AUTHOR(DRIVER_AUTHOR);
1763 MODULE_DESCRIPTION(DRIVER_DESC);
1764 MODULE_LICENSE("GPL v2");
1765